Reusability of Al-F Hydroxide Precipitates Generated in Adsorption and Coagulation Treatment of Fluoride for Adsorptive Removal of Arsenic

Reusability of Al-F Hydroxide Precipitates Generated in Adsorption and Coagulation Treatment of Fluoride for Adsorptive Removal of Arsenic
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吸附混凝处理氟化物吸附除砷过程中产生的Al-F氢氧化物沉淀的重复利用

DOI:
10.1089/ees.2014.0245
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发表时间:
2015-07
影响因子:
1.8
通讯作者:
Qu, Jiuhui
Qu, Jiuhui
中科院分区:
环境科学与生态学4区
文献类型:
--
作者:
Liu, Ruiping;Liu, Huijuan;Zhang, Xiwang;Qu, Jiuhui

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摘要本研究旨在探讨利用氢氧化铝[Al(OH)3]吸附[Al(OH)3-Fads]和铝(Al)混凝[Al(OH)3-Fcoag]中生成的Al-F氢氧化物沉淀吸附去除As(III)和As(V)的可行性。Al(OH)3-Fads、Al(OH)3-Fcoag和原始Al(OH)3在砷吸附前后通过氮吸附、X射线光电子能谱和傅立叶变换红外光谱(FTIR)表征。动力学研究表明,As(III)和As(V)在铝基固体废弃物上的吸附符合准二级动力学模型。Al(OH)3-Fads和Al(OH)3-Fcoag对As(III)的吸附容量分别为48.0和31.0 mg/g,对As(V)的吸附容量分别为84.0和56.3 mg/g。这些吸附容量比原始Al(OH)3低25-50%。在Al(OH)3-Fads去除As(V)的过程中,H2 AsO 4 −和HAsO 42 −对氟化物的阴离子交换起主导作用,而在Al(OH)3-Fads去除As(V)的过程中,As-O络合物的形成起着更重要的作用。
Abstract This study aims to investigate the feasibility of utilizing Al-F hydroxide precipitates generated in Al hydroxide [Al(OH)3] adsorption [Al(OH)3-Fads] and aluminum (Al) coagulation [Al(OH)3-Fcoag] for adsorptive removal of As(III) and As(V). Al(OH)3-Fads, Al(OH)3-Fcoag, and pristine Al(OH)3 were characterized by nitrogen sorption, X-ray photoelectron spectroscopy, and fourier transform infrared spectroscopy (FTIR) before and after arsenic adsorption. The kinetic study indicated that As(III) and As(V) adsorption on these Al-based solid wastes followed the pseudo-second-order model. The calculated adsorption capacity of Al(OH)3-Fads and Al(OH)3-Fcoag for As(III) was 48.0 and 31.0 mg/g, while it was 84.0 and 56.3 mg/g for As(V), respectively. These adsorption capacities were 25–50% lower compared with pristine Al(OH)3. Anion exchange of fluoride by H2AsO4− and HAsO42− dominated in As(V) removal by Al(OH)3-Fads, while formation of an As-O complex played a more important role in As(V) removal by Al(OH)...
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