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羧基改性酵母对锰的吸附性能与机理研究

Adsorption Perfomance and Mechanism of Carboxyl-Modified Yeast Biomass onto Mn2+
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摘要 以啤酒废酵母(YB)作为原料,通过酯化反应将含2个羧基的柠檬酸嫁接到酵母表面,通过一系列静态批次实验、表征分析等手段,研究羧基改性酵母(CA-YB)对Mn2+的吸附性能和吸附机理。结果表明,Langmuir模型能较好地拟合YB及CA-YB对Mn2+的吸附等温线,在30℃、pH=6时,YB及CA-YB对锰的最大吸附量分别为47.7、105.0 mg/L;YB、CA-YB对Mn2+的吸附较符合准一阶动力学模型;吸附反应机理主要为CA-YB表面的—COO-与Mn2+离子之间的静电吸附。作为一种廉价高效亲环境的吸附材料,在锰的去除与回收方面具有潜在的应用可能。 Citric acid containing three carboxyl groups was grafted onto the surface of the waste brewer’s yeast biomass(YB),which was chosen as a low cost raw material,through esterification reaction.After a series of batch experiments and characteristic analysis,the adsorption performance and adsorption mechanism of citric acid modified yeast biomass(CY-YB)onto Mn2+were studied.The results indicated that the Langmuir model described the adsorption isotherm data better with the maximum Mn2+adsorption capacity of 47.7 mg/L and 105.0 mg/L onto YB and CA-YB,respectively,at 30℃and pH=6.The kinetic data was fitted better by the pseudo-first-order model with higher R2 value.Moreover,the adsorption mechanism was verified to be the electrostatic adsorption between—COO-on the surface of CA-YB and Mn2+ions.CA-YB as a lowcost,good performance and eco-friendly adsorbent showed a promising potential in the further application of removal and recovery of manganese from aqueous solution.
作者 毛娟 徐亚迪 柏华双 易川 吴晓晖 任拥政 周涛 MAO Juan;XU Yadi;BAI Huashuang;YI Chuan;WU Xiaohui;REN Yongzheng;ZHOU Tao(School of Environmental Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Hubei Academy of Environment Science,Wuhan 430072,China)
出处 《环境科学与技术》 CAS CSCD 北大核心 2019年第1期43-49,共7页 Environmental Science and Technology
基金 国家科技支撑计划(2015BAB01B01,2015BAB01B04).
关键词 羧基改性 啤酒废酵母 二价锰 柠檬酸 吸附 carboxyl modification waste brewer’s yeast biomass bivalent manganese citric acid adsorption mechanism
作者简介 毛娟(1983-),女,博士,研究方向为工业废水废水处理及资源化,(电子信箱)monicamao45@hust.edu.cn。
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