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Removal and desorption of chromium in synthetic effluent by a mixed culture in a bioreactor with a magnetic field 认领
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作者 Roseli MDias Jessica GSilva +1 位作者 Vicelma LCardoso Miriam Mde Resende 《环境科学学报:英文版》 SCIE EI CAS CSCD 2020年第5期151-159,共9页
Two chromium removal experiments were performed in bioreactors with and without a magnetic field under the same conditions.The release of the chromium present in the biomass was tested in two experiments one with the ... Two chromium removal experiments were performed in bioreactors with and without a magnetic field under the same conditions.The release of the chromium present in the biomass was tested in two experiments one with the initial pH of the medium and one with pH 4.0.The objective was to remove Cr(Ⅵ)and total Cr from the effluent,this was carried out by placing biological treatments of synthetic effluent contaminated with 100 mg/L of Cr(Ⅵ)in a bioreactor with neodymium magnets that applied a magnetic field(intensity85.4 mT)to the mixed culture.The removal of Cr(Ⅵ)was approximately 100.0%for the bioreactor with a magnetic field and 93,3%for the bioreactor without a magnetic field for9 hr of recirculation of the synthetic effluent by the bioreactor.The removal of total Cr was61.6%and 48.4%,with and without a magnetic field,respectively;for 24 hr.The desorption of Cr(VI)in the synthetic effluent was 0.05 mg/L,which is below the limit established by Brazilian legislation(0.1 mg/L)for the discharge of effluent containing Cr(Ⅵ)into bodies of water.The results obtained for the removal of chromium in synthetic effluent suggested that there was no significant influence on the viable cell count of the mixed culture.The desorption of Cr(Ⅵ)in synthetic effluent after bioadsorption of chromium by the mixed culture in the process of removal of chromium in bioreactors with and without a magnetic field was not significant in either of the experiments with different initial pHs. 展开更多
关键词 Chromium removal Mixed culture Magnetic field DESORPTION Effluent treatment
Versatile Surface Modification of Ceramsite Via Honeycomb Calcium-aluminum-silicate-hydrate and Its Functionalization by 3-thiocyanatopropyltriethoxysilane for Enhanced Cadmium(Ⅱ) Removal 认领
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作者 赵都 刘鹏 +2 位作者 WANG Fazhou HU Chuanlin HU Shuguang 《武汉理工大学学报:材料科学英文版》 SCIE EI CAS 2020年第1期71-80,共10页
A low-cost and efficient filter medium for Cd(Ⅱ) removal was prepared by anchoring-SCN functional groups(by 3-thiocyanatopropyltriethoxysilane, TCPS) on ceramsite via the approach of synthesizing a honeycomb calciuma... A low-cost and efficient filter medium for Cd(Ⅱ) removal was prepared by anchoring-SCN functional groups(by 3-thiocyanatopropyltriethoxysilane, TCPS) on ceramsite via the approach of synthesizing a honeycomb calciumaluminum-silicate-hydrate(C-A-S-H) layer as intermediate. The specific surface area of ceramsite was increased enormously by more than 50 times because of the modification of honeycomb layer. Moreover, the abundant Si-OH bonds existing in the structure of CAS-H can serve as active sites for TCPS. The combined effects ensure that the hybrid filter medium(named ceramsite/C-A-S-H/TCPS) demonstrated a high Cd(Ⅱ) adsorption capacity of 18.27 mg·g^-1 for particle size of 0.1-0.6 mm, 12.63 mg·g^-1 for 0.6-1.25 mm and 8.64 mg·g^-1 for 1.25-2.35 mm. The Cd(Ⅱ) adsorption capacity per unit area of ceramsite/C-A-S-H/TCPS(0.1-0.6 mm) is up to 4.07 mg·m^-2, which is much higher than that of many nano-adsorbents. In addition, ceramsite/C-AS-H/TCPS could maintain a high removal efficiency(> 85%) in a wide range of p H 3-11 and showed excellent selectivity in the presence of competing ions. Furthermore, Cd(Ⅱ) could be desorbed from ceramsite/C-A-S-H/TCPS composites with nearly 100%, suggesting the potential application in recycling of heavy metal ions. 展开更多
关键词 HONEYCOMB C-A-S-H 3-thiocyanatopropyltriethoxysilane CERAMSITE amorphous silica Cd(Ⅱ) REMOVAL
CuO-modified activated carbon for the improvement of toluene removal in air 认领
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作者 Bingman Lei Biyan Liu +3 位作者 Huijun Zhang Libei Yan Hongmei Xie Guilin Zhou 《环境科学学报:英文版》 SCIE EI CAS CSCD 2020年第2期122-132,共11页
We used an impregnation method to prepare CuO/AC(activated carbon) composite materials of different CuO content and characterized them via scanning electron microscope(SEM), Brunauer–Emmett–Teller(BET), and Fourier ... We used an impregnation method to prepare CuO/AC(activated carbon) composite materials of different CuO content and characterized them via scanning electron microscope(SEM), Brunauer–Emmett–Teller(BET), and Fourier transform infrared spectroscopy(FT-IR).The effect of CuO content on toluene adsorption/desorption was evaluated.We explored the reusability of AC and AC03(CuO modified AC with CuO loading 0.3 wt.%) adsorbents via toluene adsorption/desorption cycle testing.We used quasi-firstand quasi-second-order models, the Bangham model, and the Weber–Morris model to fit the toluene adsorption data.The introduction of CuO species evidently improved the adsorption performance of activated carbon toward toluene.The CuO content markedly affected the specific surface area, CuO dispersal, the numbers of oxygen-containing functional groups on the surface, and adsorption performance of the prepared composite adsorbents.Low CuO content was not favorable for the formation of active adsorption sites,while high content greatly reduced the specific surface area, and even covered active adsorption sites.The toluene adsorption performance varied in the order AC03 > AC02 >AC05 > AC08 > AC01(AC03, AC02, AC05, AC08 and AC01 are CuO modifying AC with CuO loading 0.3, 0.2, 0.5 0.8 and 0.1 wt.%, respectively).The breakthrough time and toluene adsorption capacity of the AC03 composite adsorbent were 94 min and 701.8 mg/g,respectively, and the recycling efficiency was 92.8% after thermal desorption at 200°C.The adsorption process was best described by the Bangham model and adsorption could be divided into three stages. 展开更多
关键词 CUO modified ACTIVATED carbon composite adsorbents CUO SPECIES TOLUENE ADSORPTIVE REMOVAL
金属有机框架材料UTSA-74高效去除水溶液中的砷 认领
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作者 余文婷 张慧 +2 位作者 孙玉珍 吴昊 罗明标 《应用化学》 CAS CSCD 北大核心 2020年第2期205-210,共6页
利用水热法合成金属有机框架材料UTSA-74,并用它同时去除水中的As(Ⅴ)和As(Ⅲ)。批次实验结果表明,在低质量浓度情况下(~1 mg/L),UTSA-74对As(Ⅴ)的去除率高达95%。对As(Ⅲ)的去除率达85%。经拟合,本实验符合拟二级动力学及Freundlich... 利用水热法合成金属有机框架材料UTSA-74,并用它同时去除水中的As(Ⅴ)和As(Ⅲ)。批次实验结果表明,在低质量浓度情况下(~1 mg/L),UTSA-74对As(Ⅴ)的去除率高达95%。对As(Ⅲ)的去除率达85%。经拟合,本实验符合拟二级动力学及Freundlich等温吸附模型。本文还探究了共存离子(如Cl^-、NO3^-、PO4^3-)干扰影响,结果表明PO4^3-的存在会抑制吸附的进行,可能是由于竞争吸附位点所致。此外,本文对吸附后的材料进行洗脱(0.1 mol/L NaOH),将洗脱后的UTSA-74材料再次进行吸附探究,反复3次,其去除率仍可达70%左右。为探究其中机理,本文通过X射线衍射(XRD)、扫描电子显微镜(SEM)、红外光谱(IR)对吸附前后材料进行表征,结果表明吸附过程中可能形成了Zn—O—As,以此促进吸附反应的进行。综上所述,UTSA-74可以作为一种处理砷的新型吸附剂,具有一定的实用价值。 展开更多
关键词 去除 UTSA-74 机理
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Synthesis of novel adsorbent by intercalation of biopolymer in LDH for the removal of arsenic from synthetic and natural water 认领
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作者 Hanen Bessaies Sidra Iftekhar +5 位作者 Bhairavi Doshi Jamel Kheriji Mohamed Chaker Ncibi Varsha Srivastava Mika Sillanpaa Bechir Hamrouni 《环境科学学报:英文版》 SCIE EI CAS CSCD 2020年第5期246-261,共16页
This study focuses on the synthesis of nanocomposites named CCA and CZA that were prepared by the incorporation of cellulose(CL)in the Ca/Al and Zn/Al layered double hydroxide(LDH),respectively.These materials were th... This study focuses on the synthesis of nanocomposites named CCA and CZA that were prepared by the incorporation of cellulose(CL)in the Ca/Al and Zn/Al layered double hydroxide(LDH),respectively.These materials were then used for the uptake of As(Ⅲ)and As(V)from aqueous medium.Characterization of both nanocomposites(CCA and CZA)was done using FTIR and Raman analysis to identify the functional groups,N2 adsorption-desorption isotherms to determine the specific surface area and pore geometry and XPS analysis to obtain the surface atomic composition.Some other characters were investigated using simultaneous TGA and DTA and elemental chemical analysis(CHNS/O).The crystallinity of the prepared nanocomposites was displayed by XRD patterns.Furthermore,the sheet-like structure of the LDHs and the irregularity of surface morphology with porous structure were observed by TEM and SEM microphotographs.Optimization of maximum adsorption capacity was adjusted using different parameters including pH,contact time and adsorbent dosage.The pseudo-second-order model was in good fitting with kinetics results.The adsorption isotherm results showed that CZA exhibits better adsorption capacity for As(Ⅲ)than CCA and the Langmuir isotherm model described the data well for both nanocomposites.Thermodynamic studies illustrated the endothermic nature of CCA and exothermic nature on CZA,as well as the fact that the adsorption process is spontaneous.A real water sample collected from well located in Gabes(Tunisia),has also been treated.The obtained experimental results were confirmed that these sorbents are efficient for the treatment of hazardous toxic species such as. 展开更多
关键词 Layered double hydroxide Adsorption Arsenic removal Kinetics Natural water treatment
Inhibition effect of magnetic field on nitrous oxide emission from sequencing batch reactor treating domestic wastewater at low temperature 认领
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作者 Dan Xu Hongmin Ji +3 位作者 Hongqiang Ren Jinju Geng Kan Li Ke Xu 《环境科学学报:英文版》 SCIE EI CAS CSCD 2020年第1期205-212,共8页
This study aims to investigate the effect of a magnetic field on nitrous oxide(N2O)emission from a sequencing batch reactor treating low-strength domestic wastewater at low temperature(10℃).After running for 124 days... This study aims to investigate the effect of a magnetic field on nitrous oxide(N2O)emission from a sequencing batch reactor treating low-strength domestic wastewater at low temperature(10℃).After running for 124 days in parallel,results indicated that the conversion rate of N2O for a magnetic field-sequencing batch reactor(MF-SBR)decreased by34.3%compared to that of a conventional SBR(C-SBR).Meanwhile,the removal efficiencies for total nitrogen(TN)and ammonia nitrogen(NH4-N)of the MF-SBR were 22.4%and 39.5%higher than those of the C-SBR.High-throughput sequencing revealed that the abundances of AOB(Nitrosomonas),NOB(Nitrospira)and denitrifiers(Zoogloea),which could reduce N2O to N2,were promoted significantly in the MF-SBR.Enzyme activities(Nir)and gene abundances(nos Z nir S and nir K)for denitrification in the MF-SBR were also notably higher compared to C-SBR.Our study shows that application of a magnetic field is a useful approach for inhibiting the generation of N2O and promoting the nitrogen removal efficiency by affecting the microbial characteristics of sludge in an SBR treating domestic wastewater at low temperature. 展开更多
关键词 Magnetic field Low temperature N2O emission Biological nitrogen removal HIGH-THROUGHPUT 16S RRNA gene SEQUENCING
应用β-内酰胺酶类去除抗生素污染的方法探索 认领
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作者 戴欣怡 郑方方 戴军升 《环境研究与监测》 2020年第1期27-31,共5页
β-内酰胺类抗生素的广泛使用在水体中造成了严重的残留问题。为了寻找到清除水体中β-内酰胺类抗生素残留的方法,文章实验比较了包埋法、交联法固定β-内酰胺酶对β-内酰胺类抗生素的清除效果,发现交联法固定的β-内酰胺酶类对抗生素... β-内酰胺类抗生素的广泛使用在水体中造成了严重的残留问题。为了寻找到清除水体中β-内酰胺类抗生素残留的方法,文章实验比较了包埋法、交联法固定β-内酰胺酶对β-内酰胺类抗生素的清除效果,发现交联法固定的β-内酰胺酶类对抗生素去除效果优于包埋法。基于抗生素对大肠杆菌抑制效果的实验,发现不同的β-内酰胺酶类对抗生素的去除效果存在差异,其中NDM酶、KPC酶对氨苄和卡纳抗生素的去除效果最佳。经交联法固定的NDM酶能有效地去除氨苄,且可多次重复使用。β-内酰胺酶类作为一种新型抗生素分解剂,在降解环境中残留抗生素中有良好的应用前景。 展开更多
关键词 Β-内酰胺酶 交联法 包埋法 抗生素 去除
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Platinum in-situ catalytic oleylamine combustion removal process for carbon supported platinum nanoparticles 认领
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作者 Qingying Zhao Huanqiao Li +3 位作者 Xiaoming Zhang Shansheng Yu Suli Wang Gongquan Sun 《能源化学:英文版》 SCIE EI CAS CSCD 2020年第2期120-125,共6页
Colloidal synthesis method such as oleylamine(OAm)-stabilized process is of great interest for obtaining uniform and highly dispersed platinum nanoparticle catalysts, yet the ligand may unavoidably inhibit their elect... Colloidal synthesis method such as oleylamine(OAm)-stabilized process is of great interest for obtaining uniform and highly dispersed platinum nanoparticle catalysts, yet the ligand may unavoidably inhibit their electro-catalytic performance. Thus, fully removing these ligands is critical to activate catalyst surface. Previous research of OAm removal process pointed that thermal annealing was the most effective way in comparison with other methods such as chemical washing, UV–Ozone irradiation and cyclic voltammetry sweeping, but generally resulting in undesired growth of platinum nanoparticle. Few studies concerning a more efficient ligand removal process have been published yet. In this work we proposed a platinum in-situ catalytic OAm combustion strategy to elucidate the removal mechanism of OAm ligands in thermal process and the key experimental parameters were also optimized. In addition, heat flow signal based on differential scanning calorimetry(DSC) measurement as a sensitive indicator, is suggested to reveal the ligand removal efficiency, which is much more reliable than the traditional spectroscopy.In comparison with commercial Pt/C sample, such a surface clean Pt/C electrocatalyst has shown an enhanced specific activity for oxygen reduction reaction. Our removal strategy and the evaluation method are highly instructive to efficient removal of different organic ligands. 展开更多
关键词 Ligand REMOVAL PLATINUM IN-SITU CATALYTIC OAm COMBUSTION Carbon supported PLATINUM electro-catalyst ORR
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连续重整项目板式换热器更换吊装技术 认领
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作者 吕旭 《石油工程建设》 2020年第2期79-84,共6页
随着国内外连续重整装置越来越多,换热器的安装受重量、吊装高度及场地的限制也越来越严重,采用大型履带起重机可为在狭小空间内吊装换热器提供安全、高效的技术支持。结合锦州项目部80万t/a连续重整装置中板式换热器(旧)更换为缠绕式... 随着国内外连续重整装置越来越多,换热器的安装受重量、吊装高度及场地的限制也越来越严重,采用大型履带起重机可为在狭小空间内吊装换热器提供安全、高效的技术支持。结合锦州项目部80万t/a连续重整装置中板式换热器(旧)更换为缠绕式换热器(新)的工程,介绍了在狭小空间内进行换热器吊装拆除与吊装安装的工艺,论述了旧、新换热器更换的吊装过程,并对吊装地耐力要求、起重机选型核算、吊索具校核等设计要点进行了分别介绍,最后总结了本次吊装的经验教训,为以后类似的大型换热器等设备的吊装提供参考。 展开更多
关键词 换热器 拆除 安装 吊装
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Controlling fine particles in flue gas from lead-zinc smelting by plasma technology 认领
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作者 竹涛 王若男 +4 位作者 张星 韩一伟 牛文凤 薛泽宇 王礼锋 《等离子体科学与技术:英文版》 SCIE EI CAS CSCD 2020年第4期24-32,共9页
With the aim of controlling the problem of fine particles in the flue gas of lead-zinc smelting,a low-temperature plasma-electrocoagulation and electric bag composite dedusting experimental platform was designed by co... With the aim of controlling the problem of fine particles in the flue gas of lead-zinc smelting,a low-temperature plasma-electrocoagulation and electric bag composite dedusting experimental platform was designed by combining electrocoagulation and electric bag composite dust removal technology based on the research of low-temperature plasma technology.Firstly,the properties of fine particles in flue gas from lead-zinc smelting were analyzed,and the effects of input voltage,filter wind speed,dust concentration,and pulse-jet ash-cleaning cycle on the dust collection efficiency of the integrated device were studied.Then,the energy efficiency of the integrated technology was analyzed,and the control mechanism of the fine particles was revealed.The experimental results show that the integrated technology of low-temperature plasma-electrocoagulation and electric bag composite dust removal achieves a fine particle removal efficiency of more than 99.99%and the energy consumption per unit mass of the dust is only 0.008 k W·h/g.The integrated technology has broad application prospects and farreaching practical significance for the lead-zinc smelting industry to achieve ultra-low emission targets for flue gas and achieve energy-saving and emission reduction effects. 展开更多
关键词 lead-zinc smelting smoke fine particles low-temperature plasma low-temperature plasma-electrocoagulation and electric bag compound dust removal integrated technology
水稻秸秆灰对水中双酚A的吸附去除性能研究 认领
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作者 王健斐 陈再明 李兵 《宁波大学学报:理工版》 CAS 2020年第2期66-72,共7页
以比表面积为1572 m^2·g^-1的粉末活性炭为参照,研究了水稻秸秆于350和500℃灼烧产生的灰对双酚A的吸附性能,为认识和利用水稻秸秆灰去除水中有机微污染物提供参考.结果显示,水稻秸秆灰对双酚A的去除过程符合两室模型,其快吸附阶段... 以比表面积为1572 m^2·g^-1的粉末活性炭为参照,研究了水稻秸秆于350和500℃灼烧产生的灰对双酚A的吸附性能,为认识和利用水稻秸秆灰去除水中有机微污染物提供参考.结果显示,水稻秸秆灰对双酚A的去除过程符合两室模型,其快吸附阶段在2 h内平衡,慢吸附阶段需5~7 d才能平衡,慢于活性炭的吸附平衡过程(需2.5 h).水稻秸秆灰的吸附等温线符合Dubinin-Ashtakhov模型,单位质量的最大吸附容量为18.0 mg·g^-1(350℃灰分)和10.3 mg·g^-1(500℃灰分),是活性炭(245 mg·g^-1)的4.2%~7.3%;单位比表面积的最大吸附容量为1.81 mg·m^-2(350℃灰分)和1.68 mg·m^-2(500℃灰分),是活性炭(0.156 mg·m^-2)的11~12倍,表明水稻秸秆灰是一种单位比表面吸附效率较高的双酚A吸附剂. 展开更多
关键词 水稻秸秆灰 双酚A 吸附 去除
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漆酶去除蓝湿革中三氯苯酚的研究 认领
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作者 王荣娅 马贺伟 +3 位作者 赖纪浩 缪茂威 金琳朝 袁亚娅 《皮革科学与工程》 CAS 北大核心 2020年第3期15-19,共5页
研究了漆酶去除蓝湿革中三氯苯酚(Tr CP)的可行性。采用常规的制革工艺,考察了温度、pH、酶用量、作用时间等条件下漆酶去除蓝湿革中Tr CP的效果。结果表明,在pH=4.5、温度45℃、漆酶(268)用量0.1%,转动1h,蓝湿革中Tr CP的去除率可达到... 研究了漆酶去除蓝湿革中三氯苯酚(Tr CP)的可行性。采用常规的制革工艺,考察了温度、pH、酶用量、作用时间等条件下漆酶去除蓝湿革中Tr CP的效果。结果表明,在pH=4.5、温度45℃、漆酶(268)用量0.1%,转动1h,蓝湿革中Tr CP的去除率可达到90%以上,相同条件下未加入漆酶的对比实验中,Tr CP去除率约70%。实验结果显示出漆酶在深度去除蓝湿革中的Tr CP方面具有一定的效果。 展开更多
关键词 蓝湿革 三氯苯酚 去除
Experimental Study on In-situ Leaching and Electrokinetic Remediation of Composite Heavy Metal-contaminated Soil 认领
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作者 Hui HAN Juan ZHAI +3 位作者 Anwei WANG Juan LI Chengdong XU Yushan WAN 《农业生物技术:英文版》 CAS 2020年第2期73-78,共6页
[Objectives] This study was conducted to investigate in-situ leaching and electrokinetic combined remediation of composite heavy metal-contaminated soil.[Methods] Leaching and electrokientic combined remediation was a... [Objectives] This study was conducted to investigate in-situ leaching and electrokinetic combined remediation of composite heavy metal-contaminated soil.[Methods] Leaching and electrokientic combined remediation was applied to remediate artificially-simulated composite Cd,Cu,Pb,and Zn-contaminated soil.The electrokinentic remediation of the soil was carried out using EDTA and acetic acid as the eluents with electrodes placed on the top and bottom of the soil,to investigate the effects of different types and concentrations of eluents,reaction time and energization methods on the remediation.[Results]Applying electrodynamic force to the leaching remediation process achieved good removal effects of Cd,Cu,Pb,and Zn in the soil.Compared with pure leaching,the leaching and electrokinetic combined remediation saved 23.8% of EDTA consumption.EDTA showed the ability to complex heavy metals better than acetic acid,and after 10 d of reaction,the 0.1 mol/L EDTA achieved very good removal effects on Cd,Cu,Pb,and Zn from the upper and middle layers of the soil column,exhibiting removal rates of 94.4%,93.3%,91.4% and 92.8% in the upper layer and 87.2%,88.2%,83.3% and 84.6%,respectively.Compared with the conventional experiments,the intermittent energization method and the voltage-increasing method improved the removal rates of Cd,Cu,Pb and Zn by 6.3%,6.1%,5.9%and 6%,and 0.6%,0.9%,0.5% and 0.4%,respectively,and saved 46.8% and 10.3% of energy consumption,respectively.[Conclusions]The study provides reference for the remediation of composite heavy metal-contaminated soil. 展开更多
关键词 EDTA Acetic acid HEAVY METALS REMOVAL rate Energy CONSUMPTION
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Study on Electrokinetic Remediation of Cadmium-contaminated Soil 认领
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作者 Liwei QIU 《农业生物技术:英文版》 CAS 2020年第2期82-85,88共5页
[Objectives] This study was conducted to explore the effect of electrokinetic remediation of Cd-contaminated soil.[Methods] By preparing Cd-contaminated soil and constructing an electrokinetic remediation experimental... [Objectives] This study was conducted to explore the effect of electrokinetic remediation of Cd-contaminated soil.[Methods] By preparing Cd-contaminated soil and constructing an electrokinetic remediation experimental device,the effects of changing remediation time,voltage gradient,electrolyte type and power-on method on the removal rate of Cd were studied.[Results]When the voltage gradient was increased from 0.5 to 1.0 V/cm,the total Cd removal rate increased by 13%;and when the voltage gradient was increased from 1.0 to 1.5 V/cm,the total Cd removal rate only increased by 3%.Compared with 72 h of electrokinetic remediation,96 h of remediation increased the remediation rate by 4%,and the total energy consumption increased by 13%,while 120 h of remediation increased the remediation rate by 6.5%,and the total energy consumption increased by 67%.Compared with citric acid as electrolyte,the remediation rate of the acetic acid group increased by 12%,and the total energy consumption increased by 42%,while the remediation rate of the hydrochloric acid group increased by18%,and the total energy consumption increased by 70.5%.Compared with the conventional remediation method,the total Cd removal rates achieved by the different power-on methods increased by 9% and 31%,respectively,and the total energy consumption decreased by 58% and 45%,respectively.[Conclusions]The electrokinetic remediation technology has certain advantage in remediating Cd-contaminated soil. 展开更多
关键词 Voltage GRADIENT ELECTROLYTE type INTERMITTENT ENERGIZATION Removal rate Enerey consumption
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化学与湍流团聚耦合促进燃煤细颗粒物团聚与脱除 认领
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作者 孙宗康 张笑丹 +2 位作者 杨林军 陈帅 吴新 《化工学报》 EI CAS CSCD 北大核心 2020年第3期1317-1325,共9页
将化学团聚与湍流团聚技术耦合,实验研究了燃煤细颗粒物在化学与湍流团聚耦合作用下的团聚与脱除效果,以及颗粒物浓度、烟气温度、团聚液喷入量与烟气流速等因素对细颗粒物团聚与脱除效果的影响规律。结果表明,典型工况下化学-湍流耦合... 将化学团聚与湍流团聚技术耦合,实验研究了燃煤细颗粒物在化学与湍流团聚耦合作用下的团聚与脱除效果,以及颗粒物浓度、烟气温度、团聚液喷入量与烟气流速等因素对细颗粒物团聚与脱除效果的影响规律。结果表明,典型工况下化学-湍流耦合团聚能够进一步促进细颗粒物团聚长大以及静电除尘器对细颗粒物的脱除,其作用效果优于单独的化学与湍流团聚。随细颗粒物浓度的升高,团聚与脱除效率均逐渐下降,分别由49.2%与96.7%下降至35.3%与88.2%。随烟气温度与团聚液喷入量的增加,细颗粒物团聚与脱除效率均先升高后降低,并在180℃与12 L/h处达到最高值,团聚与脱除效率分别为44.7%与94.8%。随烟气流速的增加,细颗粒物团聚与脱除效率均逐渐升高,分别由30.5%与86.3%升高至50.2%与97.5%。 展开更多
关键词 气溶胶 团聚 化学喷雾 湍流 耦合 脱除
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Superior trichloroethylene removal from water by sulfide-modified nanoscale zero-valent iron/graphene aerogel composite 认领
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作者 Qiong Bin Bin Lin +5 位作者 Ke Zhu Yaqian Shen Yuanyuan Man Boyang Wang Changfei Lai Wenjin Chen 《环境科学学报:英文版》 SCIE EI CAS CSCD 2020年第2期90-102,共13页
Sulfide-modified nanoscale zero-valent iron(S-nZVI) is a promising material for removal of organic pollutants from water, but S-nZVI nanoparticles(NPs) easily agglomerate and have poor contact with organic contaminant... Sulfide-modified nanoscale zero-valent iron(S-nZVI) is a promising material for removal of organic pollutants from water, but S-nZVI nanoparticles(NPs) easily agglomerate and have poor contact with organic contaminants.Herein, we propose a new S-nZVI/graphene aerogel(S-nZVI/GA) composite which exhibits superior removal capability for trichloroethylene(TCE) from water.Three-dimensional porous graphene aerogel(GA) can improve the efficiency of electron transport, enhance the adsorption of organic pollutants and restrain the agglomeration of the core-shell S-nZVI NPs.The TCE removal rates of Fe S, nZVI, GA and S-nZVI were 27.8%, 42%, 63% and 75% in 2 hr, respectively.Furthermore, TCE was completely removed within 50 min by S-nZVI/GA.The TCE removal rate increased with increasing p H and temperature, and TCE removal followed the pseudo-first-order kinetic model.The results demonstrate the great potential of S-nZVI/GA composite as a low-cost,easily separated and superior monolithic adsorbent for removal of organic pollutants. 展开更多
关键词 Organic pollutant REMOVAL TRICHLOROETHYLENE (TCE) Sulfide-modified nanoscale zero-valent iron GRAPHENE AEROGEL Nanocomposite
Enhanced phosphate removal using zirconium hydroxide encapsulated in quaternized cellulose 认领
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作者 Shuoxun Dong Qinghua Ji +2 位作者 Yili Wang Huijuan Liu Jiuhui Qu 《环境科学学报:英文版》 SCIE EI CAS CSCD 2020年第3期102-112,共11页
Zirconium-based materials are efficient adsorbent for aqueous phosphate removal.However,current zirconium-based materials still show unsatisfied performance on adsorption capacity and selectivity.Here,we demonstrate a... Zirconium-based materials are efficient adsorbent for aqueous phosphate removal.However,current zirconium-based materials still show unsatisfied performance on adsorption capacity and selectivity.Here,we demonstrate a zirconium hydroxide encapsulated in quaternized cellulose(QC-Zr) for the selective phosphate removal.Zirconium hydroxide nanoparticles were simultaneously generated in situ with the QC framework and firmly anchored in the three-dimensional(3D) cross-linked cellulose chains.The maximum P adsorption capacity of QC-Zr was 83.6 mg P/g.Furthermore,the QC-Zr shows high P adsorption performance in a wide pH range,generally due to the electrostatic effects of quaternized cellulose.The enhanced adsorption of P was also achieved in the presence of competing anions(including Cl^-,NO3^-,SO4^2-,SO4^4-) and humic acid(HA) even at a molar ratio up to 20 levels.The column adsorption capacity of QC-Zr reached 4000 bed volumes(BV) at EBCT=0.5 min as the P concentration decreased from 2.5 to 0.5 mg/L.Mechanism study revealed that both-N^+(CH3)3 groups and zirconium hydroxide were involved in phosphate adsorption via electrostatic interactions between -N^+(CH3)3 and phosphate,and the formation of zirconium hydrogen phosphate(Zr(HPO4)x).The 31 P nuclear magnetic resonance(NMR) study implied that P surface-precipitated and inner-sphere complexed with zirconium hydroxide at a ratio of 3:1. 展开更多
关键词 Adsorption PHOSPHATE removal ZIRCONIUM HYDROXIDE AEROGEL Quaternized CELLULOSE
Adsorption and recovery of phosphate from water by amine fiber,effects of co-existing ions and column filtration 认领
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作者 Jinshan Wei Xiaoguang Meng +1 位作者 Xianghua Wen Yonghui Song 《环境科学学报:英文版》 SCIE EI CAS CSCD 2020年第1期123-132,共10页
A weak-base adsorption fiber,acrylic amine fiber(AAF),was prepared for removal and recovery of phosphate from water.The adsorption properties of the AAF for phosphate and effects of co-existing ions were investigated ... A weak-base adsorption fiber,acrylic amine fiber(AAF),was prepared for removal and recovery of phosphate from water.The adsorption properties of the AAF for phosphate and effects of co-existing ions were investigated using batch and column filtration experiments,scanning electron microscope,and Fourier transform infrared techniques.Experimental results showed that AAF had a high phosphate adsorption capacity of 119 mg/g at pH 7.0.The effects of calcium,sulfate,carbonate,nitrate,and fluoride showed that sulfate and calcium inhibited phosphate adsorption.However,AAF showed higher binding affinity toward phosphate than sulfate.Column filtration results showed that AAF could filter 1420 bed volumes of tap water containing 1.0 mg-P/L of phosphate.The saturated AAF could be regenerated using 0.5 mol/L hydrochloric acid solution and reused.After desorption,phosphate was recovered through precipitation of hydroxyapatite(Ca5(PO4)3OH).The easy of regeneration,good adsorption performance,and the fiber morphology of AAF make it an attractive alternative for phosphate recovery from multiple water sources. 展开更多
关键词 Wastewater treatment PHOSPHATE removal ADSORPTION ACRYLIC AMINE FIBER Phosphorus RECOVERY
Removal of hexavalent chromium in aquatic solutions by pomelo peel 认领
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作者 Qiong Wang Cong Zhou +2 位作者 Yin-jie Kuang Zhao-hui Jiang Min Yang 《水科学与水工程:英文版》 EI CAS CSCD 2020年第1期65-73,共9页
This study investigated the removal of hexavalent chromium(Cr(VI))in aqueous solutions using pomelo peel(PP)and FeCl3-modified pomelo peel(FPP)as novel biomass adsorbents.Batch adsorption experiments were performed to... This study investigated the removal of hexavalent chromium(Cr(VI))in aqueous solutions using pomelo peel(PP)and FeCl3-modified pomelo peel(FPP)as novel biomass adsorbents.Batch adsorption experiments were performed to evaluate the effects of pH,time,temperature,initial concentration,and adsorbent dose on Cr(VI)removal by PP and FPP.The results show that the maximum adsorption capacity of Cr(VI)was 21.55 mg/g for FPP and 0.57 mg/g for PP at a pH of 2.0 and a temperature of 40C.The surface shape,microstructure,and chemical composition of FPP were analyzed with scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),and energy dispersive spectroscopy(EDS),and compared with those of PP.The results show that the adsorption performance of FPP was much better than that of PP,indicating that FPP can be an alternative high-efficiency adsorbent for Cr(VI)removal. 展开更多
关键词 ADSORPTION Hexavalent chromium removal Biomass adsorbent Pomelo peel FeCl3-modi ed pomelo peel Aquatic solution
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硫代硫酸钾溶液去除土壤中二溴乙烷及重金属研究 认领
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作者 何昶 曾清如 《中国资源综合利用》 2020年第3期27-30,共4页
本试验对K2S203溶液促进C2H4Br2降解为Br-的影响因素进行了研究,并探讨了不同浓度的K2S203溶液在污染土壤中对C2H4Br2及重金属的去除能力。结果表明,K2S203溶液在较短的时间能有效地促进C2H4Br2降解为Br-,并且适宜的高温和弱酸性环境更... 本试验对K2S203溶液促进C2H4Br2降解为Br-的影响因素进行了研究,并探讨了不同浓度的K2S203溶液在污染土壤中对C2H4Br2及重金属的去除能力。结果表明,K2S203溶液在较短的时间能有效地促进C2H4Br2降解为Br-,并且适宜的高温和弱酸性环境更有利于加快K2S203与C2H4Br2的反应,随着K2S203浓度的提高,K2S203溶液对C2H4Br2、Cu、Cd的去除能力增加,其中Cu、Cd的去除率达62.8%和49.8%。 展开更多
关键词 硫代硫酸钾 二溴乙烷 重金属 去除 影响因子
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