铁锰泥除砷颗粒吸附剂对As(Ⅴ)的吸附去除 |
摘要点击 4132 全文点击 1264 投稿时间:2017-06-21 修订日期:2017-07-20 |
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中文关键词 反冲洗泥 除砷 颗粒吸附剂 表征 吸附 |
英文关键词 backwashing residuals arsenic remove granular adsorbents characterization adsorption |
作者 | 单位 | E-mail | 曾辉平 | 北京工业大学建筑工程学院,水质科学与水环境恢复工程北京市重点实验室,北京 100124 | zenghuiping@bjut.edu.cn | 吕赛赛 | 北京工业大学建筑工程学院,水质科学与水环境恢复工程北京市重点实验室,北京 100124 | | 杨航 | 哈尔滨工业大学市政环境工程学院,城市水资源与水环境国家重点实验室,哈尔滨 150090 | | 尹灿 | 北京工业大学建筑工程学院,水质科学与水环境恢复工程北京市重点实验室,北京 100124 | | 曹瑞华 | 北京工业大学建筑工程学院,水质科学与水环境恢复工程北京市重点实验室,北京 100124 | | 王艳菊 | 北京工业大学建筑工程学院,水质科学与水环境恢复工程北京市重点实验室,北京 100124 | | 李冬 | 北京工业大学建筑工程学院,水质科学与水环境恢复工程北京市重点实验室,北京 100124 | | 张杰 | 北京工业大学建筑工程学院,水质科学与水环境恢复工程北京市重点实验室,北京 100124 哈尔滨工业大学市政环境工程学院,城市水资源与水环境国家重点实验室,哈尔滨 150090 | |
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中文摘要 |
以除铁除锰生物滤池反冲洗泥为主要原料制备除砷颗粒吸附剂(granular adsorbents for arsenic removal,GA),使用SEM、XRD与BET等技术对其进行表征,并考察了GA对As(Ⅴ)的吸附机制和性能.结果表明,GA表面粗糙且孔隙发达;XRD图谱中出现石英晶体和少量赤铁矿晶体衍射峰,内部结晶度差;比表面积为43.8 m2·g-1,存在大量介孔.吸附动力学过程符合准二级动力学模型.Freundlich等温方程更符合其吸附行为(R2=0.994).最大吸附容量为5.05 mg·g-1.进一步分析表明,在pH为1.1~9.5的范围内,GA对As(Ⅴ)具有较好的吸附效果.H2PO4-与SiO32-能显著抑制As(Ⅴ)的吸附,而HCO3-、SO42-对吸附效果影响相对较小.GA的可再生性好,3次再生后吸附量相当于初始吸附量的82%. |
英文摘要 |
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 SO42- had no great influence on arsenic adsorption, while the H2PO4- and SiO32- showed negative effects. The GA can be regenerated well, and 82% of the original adsorption capacity was maintained after three regeneration cycles. |
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