Arsenic(Ⅴ) Removal by Granular Adsorbents Made from Backwashing Residuals from Biofilters for Iron and Manganese Removal

被引：5
作者：
Zeng H.-P. [1 ]
Lü S.-S. [1 ]
Yang H. [2 ]
Yin C. [1 ]
Cao R.-H. [1 ]
Wang Y.-J. [1 ]
Li D. [1 ]
Zhang J. [1 ,2 ]
机构：
[1] Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Colloge of Architecture and Civil Engineering, Beijing University of Technology, Beijing
[2] State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin
来源：
| 2018年 / Science Press卷 / 39期
关键词：
Adsorption; Arsenic remove; Backwashing residuals; Characterization; Granular adsorbents;
D O I：
10.13227/j.hjkx.201706209
中图分类号：
学科分类号：
摘要：
Granular adsorbents for arsenic removal (GA) made from the backwashing residuals from iron and manganese removal biofilters for groundwater were characterized and examined as an arsenate sorbent. The GA were characterized by SEM-EDS microscopy, X-ray diffraction (XRD), and BET surface area measurement. The results showed that the GA had rough surfaces, developed pores, and were mainly amorphous, with small fractions of crystalline quartz and hematite. The surface area of the GA, which consists of many mesopores, was 43.8 m2•g-1. The kinetic studies revealed that arsenate adsorption on the GA was described by a pseudo-second-order kinetic equation, and the Freundlich isotherm equation fit the arsenate adsorption well (R2=0.994). The maximum adsorption capacity calculated by the Langmuir isotherm equation for As(Ⅴ) was 5.05 mg•g-1. Further studies showed that the GA operated well for As(Ⅴ) removal over a broad range in pH from 1.1 to 9.5. The coexistence of HCO3 - and SO4 2- had no great influence on arsenic adsorption, while the H2PO4 - and SiO3 2- showed negative effects. The GA can be regenerated well, and 82% of the original adsorption capacity was maintained after three regeneration cycles. © 2018, Science Press. All right reserved.
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页码：170 / 178
页数：8
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