CIESC Journal ›› 2015, Vol. 66 ›› Issue (2): 730-737.DOI: 10.11949/j.issn.0438-1157.20141073

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Removal of arsenite from aqueous environment by zero-valent iron (ZVI)

ZHAO Yaguang1,2, WAN Junfeng1, WANG Jie1, YU Fei1, WANG Yan1   

  1. 1 School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, Henan, China;
    2 Henan Textile & Architecture Design Co. Ltd., Zhengzhou 450007, Henan, China
  • Received:2014-07-16 Revised:2014-10-09 Online:2015-02-05 Published:2015-02-05
  • Supported by:

    supported by the National Natural Science Foundation of China (21107100) and Zhengzhou International Science and Technology Cooperation and Exchange Projects(141TGJHZ535).

零价铁(ZVI)去除水中的As(Ⅲ)

赵雅光1,2, 万俊锋1, 王杰1, 余飞1, 王岩1   

  1. 1 郑州大学化工与能源学院, 河南 郑州 450001;
    2 河南省纺织建筑设计院有限公司, 河南 郑州 450007
  • 通讯作者: 万俊锋
  • 基金资助:

    国家自然科学基金项目(21107100);郑州市国际合作与交流项目(141TGJHZ535)。

Abstract:

The batch and column experiments on removal of As(Ⅲ) from aqueous environment by zero-valent iron (ZVI) and quartz sand mixed with ZVI were studied. The batch test results showed that removal efficiency of As(Ⅲ) by ZVI was dependent on pH value and the optimum range of pH was 4—9. As(Ⅲ) was mainly removed though adsorption and co-precipitation by the surface of ZVI and its corrosion products. Meanwhile, simultaneous oxidation and reduction of As(Ⅲ) on the surface of ZVI occurred during the corrosion process of ZVI. As(Ⅲ) was oxidized in oxidation of Fe2+ to Fe3+. Quartz sand mixed with ZVI was used for the adsorption of As(Ⅲ) from simulated arsenic-containing wastewater in the column experiment. After 20 d of continuous adsorption of As(Ⅲ), the column was saturated. The calculated adsorption capacity of As(Ⅲ) by ZVI was 89.90 mg·g-1 and the adsorption capacity of As(Ⅲ) was affected by the crystalline types of ZVI corrosion products on the surface of quartz sand. In this study, amorphous corrosion products of ZVI had the largest adsorption capacity, and mass fraction and atom fraction reached 6.73 and 2.15 respectively.

Key words: ZVI, environment, adsorption, oxidation, arsenic polluted wastewater, arsenic removal

摘要:

采用市售还原铁粉(零价铁,ZVI)及其与石英砂的复合物为吸附剂,对水中As(Ⅲ)的吸附分别做了分批试验和连续性试验。分批试验结果表明,ZVI吸附水中As(Ⅲ)的去除效果受pH主导,其最佳pH范围4~9,ZVI主要通过其表面吸附及其腐蚀产物对As(Ⅲ)的吸附共沉淀作用达到对As(Ⅲ)的去除,同时,在ZVI腐蚀的过程中还伴有在ZVI表面As(Ⅲ)的氧化、还原作用,As(Ⅲ)的氧化受ZVI腐蚀过程的影响,其氧化过程主要发生在Fe2+氧化为Fe3+的阶段;连续性试验利用ZVI与石英砂复合物对模拟含砷废水进行吸附研究,从吸附柱进水至吸附饱和共20 d时间,经计算,ZVI对As(Ⅲ)的吸附容量为89.90 mg·g-1,ZVI腐蚀产物在石英砂表面的晶态类型对As(Ⅲ)的吸附容量有影响,无定形态的ZVI腐蚀产物对As(Ⅲ)的吸附容量最大,质量分数和原子分数分别可达到6.73%和2.15%。

关键词: 零价铁, 环境, 吸附, 氧化, 含砷废水, 除砷

CLC Number: