| 钙预处理对磁性锆铁改性膨润土吸附水中磷酸盐的影响 |
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| 引用本文： | 赵钰颖,林建伟,张宏华,张志斌,詹艳慧,姜博汇,何思琪,俞阳,吴小龙,王艳,陈璐,李十盛. 钙预处理对磁性锆铁改性膨润土吸附水中磷酸盐的影响[J]. 环境科学, 2019, 40(2): 658-668 |
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| 作者姓名： | 赵钰颖 林建伟 张宏华 张志斌 詹艳慧 姜博汇 何思琪 俞阳 吴小龙 王艳 陈璐 李十盛 |
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| 作者单位： | 上海海洋大学海洋生态与环境学院,上海,201306;浙江工业大学环境学院,杭州,310032;山东建筑大学市政与环境工程学院,济南,250101 |
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| 基金项目： | 国家自然科学基金项目（51408354，50908142）；上海市自然科学基金项目（15ZR1420700）；上海海洋大学优秀本科生进实验室项目；上海海洋大学本研一体化教学团队项目 |
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| 摘 要： | 本研究制备了2种不同Ca2+含量的磁性锆铁改性膨润土(ZrFeBTs),即磁性锆铁改性原始膨润土(ZrFeRBT)和磁性锆铁改性钙预处理膨润土(ZrFeCaBT),并通过吸附实验考察了ZrFeRBT和ZrFeCaBT对水中磷酸盐的吸附特征,以确定Ca2+预处理对ZrFeBTs吸附水中磷酸盐的影响。结果发现,本研究所制备的ZrFeBTs包含Fe3O4和Zr,并且ZrFeCaBT中可交换Ca2+的含量明显高于ZrFeRBT。ZrFeBTs对水中磷酸盐吸附平衡实验数据可以很好地采用Langmuir等温吸附模型加以描述,动力学实验数据可以很好地采用准二级动力学模型和颗粒内扩散模型进行描述。根据Langmuir模型确定的ZrFeRBT和ZrFeCaBT对水中磷酸盐的最大单位吸附量(以磷计)分别为8.70mg·g-1和11.5mg·g-1。ZrFeBTs吸附水中磷酸盐的过程属于化学吸附。随着pH值的增加,ZrFeBTs对水中磷酸盐的吸附效果逐渐降低。当溶液共存Cl-、HCO3-、SO42-、NO3-、Na+、K+、Mg2+和Ca2+等阴阳离子时,ZrFeBTs对水中磷酸盐的吸附具有很好的选择性,并且溶液共存的Ca2+会极大地促进了ZrFeBTs对水中磷酸盐的吸附。采用Ca2+对膨润土进行预处理,极大地提高了ZrFeBTs对水中磷酸盐的吸附能力。
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| 关 键 词： | 磁性锆铁改性膨润土 钙预处理 吸附 磷酸盐 影响 |
| 收稿时间： | 2018-06-29 |
| 修稿时间： | 2018-08-12 |
Influence of Calcium Ion Pre-treatment on Phosphate Adsorption onto Magnetic Zirconium/Iron-modified Bentonite |
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| ZHAO Yu-ying,LIN Jian-wei,ZHANG Hong-hu,ZHANG Zhi-bin,ZHAN Yan-hui,JIANG Bo-hui,HE Si-qi,YU Yang,WU Xiao-long,WANG Yan,CHEN Lu and LI Shi-sheng. Influence of Calcium Ion Pre-treatment on Phosphate Adsorption onto Magnetic Zirconium/Iron-modified Bentonite[J]. Chinese Journal of Environmental Science, 2019, 40(2): 658-668 |
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| Authors: | ZHAO Yu-ying LIN Jian-wei ZHANG Hong-hu ZHANG Zhi-bin ZHAN Yan-hui JIANG Bo-hui HE Si-qi YU Yang WU Xiao-long WANG Yan CHEN Lu LI Shi-sheng |
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| Affiliation: | College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China,College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China,College of Environment, Zhejiang University of Technology, Hangzhou 310032, China,College of Municipal and Environmental Engineering, Shandong Jianzhu University, Ji''nan 250101, China,College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China,College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China,College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China,College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China,College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China,College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China,College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China and College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China |
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| Abstract: | Two kinds of magnetic zirconium/iron-modified bentonites (ZrFeBTs), including magnetic zirconium/iron modified raw bentonite (ZrFeRBT) and magnetic zirconium/iron-modified Ca2+-pretreated bentonite, (ZrFeCaBT) were prepared and characterized. Their phosphate adsorption characteristics were compared to determine the effect of the Ca2+ pre-treatment on the adsorption of phosphate onto ZrFeBTs. The results showed that the as-prepared ZrFeBTs contained Fe3O4 and Zr, and the content of exchangeable Ca2+ in ZrFeCaBT was much higher than that in ZrFeRBT. The adsorption isotherm data exhibited good agreement with the Langmuir isotherm model, with maximum monolayer phosphate adsorption capacities of 8.70 mg·g-1 and 11.5 mg·g-1 for ZrFeRBT and ZrFeCaBT, respectively. The isotherm and kinetics studies showed that the adsorption of phosphate on ZrFeBTs was a chemisorption process. The phosphate adsorption capacities for ZrFeBTs decreased with increasing solution pH. The ZrFeBTs exhibited a high selective adsorption for phosphate in the presence of anions and cations, including Cl-, HCO3-, SO42-, NO3-, Na+, K+, Mg2+, and Ca2+. Furthermore, coexisting Ca2+ greatly enhanced the adsorption of phosphate onto ZrFeBTs. The pre-treatment of raw bentonite with Ca2+ significantly improved the adsorption of phosphate onto ZrFeBTs. |
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| Keywords: | magnetic zirconium/iron-modified bentonite calcium ion pre-treatment adsorption phosphate effect |
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