La<sub>2</sub>O<sub>3</sub>纳米颗粒对水溶液中As (Ⅲ)的吸附

叶倩玲; 金歆; 陈箫; 史琳; 杨琦; 刘兆香; 王京; 张晓岚; 王树堂

doi:10.13205/j.hjgc.202001016

La₂O₃纳米颗粒对水溶液中As (Ⅲ)的吸附

doi: 10.13205/j.hjgc.202001016

叶倩玲¹,
金歆¹,
陈箫¹,
史琳¹,
杨琦¹,
刘兆香²,
王京²,
张晓岚²,
王树堂^2, ,

1. 中国地质大学(北京) 水资源与环境工程北京市重点实验室地下水循环与环境演化教育部重点实验室, 北京 100083;
2. 生态环境部对外合作与交流中心, 北京 100035

基金项目:

北京市产学研项目（51900265005）；国家科技重大专项（2009zx07207-008，2009zx07419-002，2009zx07207-001，2015zx07406005-001）；中央高校基本科研业务费专项资金（2652013101，2652013086，2652013087）。

详细信息

作者简介:
叶倩玲(1993-),女,硕士,主要研究方向为水处理技术。13121625088@qq.com

通讯作者:
王树堂(1982-),男,硕士,工程师,主要从事环保技术与产业研究。wang_shutang@mepfeco.org.cn

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出版历程
- 收稿日期: 2018-12-18

ADSORPTION OF As(Ⅲ) ON La₂O₃ NANOPARTICLES IN AQUEOUS SOLUTION

1. Beijing Key Laboratory of Water Resources&Environmental Engineering Laboratory of Groundwater Circulation and Evolution, School of Water Resources and Environment, China University of Geosciences(Beijing), Beijing 100083, China;
2. Foreign Economic Cooperation Office, Ministry of Ecology and Environment, Beijing 100035, China

摘要

摘要: 以十六烷基三甲基溴化铵（CTMAB）为表面活性剂，采用共沉淀法制得La₂O₃纳米颗粒。利用扫描电子显微镜（SEM）、X射线衍射（XRD）和比表面积分析仪（BET）对La₂O₃纳米颗粒进行分析。采用批实验考察了溶液pH、典型阴离子和离子强度等因素对La₂O₃纳米颗粒吸附溶液中As （Ⅲ）的影响，并对吸附动力学、吸附等温模型及吸附机理进行研究。结果表明：添加质量分数为0.2%的CTMAB时制得的La₂O₃对As （Ⅲ）的吸附效果最好。当溶液pH为5~9时，As （Ⅲ）去除率较高，可达85.36%。溶液中共存的SO^2-₄和CO^2-₃对As （Ⅲ）的吸附影响较小，而SiO^2-₃和PO₄^3-增加到10 mmol/L时，As （Ⅲ）去除率从85.36%分别降低至39.14%和25.36%。离子强度对As （Ⅲ）的吸附影响较小，表明该吸附过程为内层吸附。La₂O₃纳米颗粒对As （Ⅲ）的吸附符合伪二级反应动力学和Langmuir吸附等温模型，表明该吸附为单分子层吸附，理论最大吸附量为45.5 mg/g。La₂O₃纳米颗粒吸附As （Ⅲ）的机理分析为La₂O₃表面羟基化后产生的羟基基团La—OH与As （Ⅲ）反应生成单齿或双齿络合物，从而将As （Ⅲ）从水溶液中去除。
- La₂O₃纳米颗粒 /
- 吸附 /
- 砷 /
- 机理 /
- 动力学
Abstract: La₂O₃ nanoparticles, using cetrimonium bromide(CTMAB) as the surfactant, were prepared by co-precipitation method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and N₂ adsorption-desorption isotherms(BET). A series of batch experiments were carried out to study the effects of solution pH, coexisting anions and ionic strength on the adsorption of As(Ⅲ) by La₂O₃ nanoparticles. Adsorption kinetics and adsorption isotherm models were used to simulate the adsorption process and explore the adsorption mechanism. The results showed that La₂O₃ prepared with 0.2% CTMAB had a higher adsorption capacity on As(Ⅲ). The optimum pH range of As(Ⅲ) adsorption was 5~9. The effect of SO^2-₄ and CO^2-₃ on the adsorption of As(Ⅲ) was insignificant, while the efficiencies of As(Ⅲ) adsorption were separately decreased to 39.14% and 25.36%, when the concentrations of SiO^2-₃ and PO₄^3- were increased to 10 mmol/L. The negligible influence of ionic strength on the adsorption indicated that the adsorption was an inner layer adsorption; the adsorption of As(Ⅲ) by La₂O₃ nanoparticles fitted with the pseudo-secondary reaction kinetics and the Langmuir adsorption isotherm model, demonstrating that the adsorption was a monolayer adsorption. The theoretical maximum adsorption capacity of La₂O₃ nanoparticles was 45.5 mg/g. The mechanism for As(Ⅲ) adsorption was as follows: the hydroxyl group La—OH formed by hydroxylation of La₂O₃ reacted with As(Ⅲ) and generated a monodentate or bidentate complex, which removed As(Ⅲ) from aqueous solution.
- La₂O₃ nanoparticles /
- adsorption /
- arsenic /
- mechanism /
- kinetics

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