Exploration of As(III)/As(V) Uptake from Aqueous Solution by Synthesized Calcium Sulfate Whisker

doi:10.1016/j.cjche.2014.09.018

›› 2014, Vol. 22 ›› Issue (11/12): 1340-1346.DOI: 10.1016/j.cjche.2014.09.018

• 能源、资源与环境技术 • 上一篇下一篇

Exploration of As(III)/As(V) Uptake from Aqueous Solution by Synthesized Calcium Sulfate Whisker

Xiaojuan Chen, Liuchun Yang, Junfeng Zhang, Yan Huang

Key Laboratory of Heavy Metal Pollution Control of Hunan Province, Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, China

收稿日期:2013-05-16 修回日期:2013-11-11 出版日期:2014-12-28 发布日期:2014-12-24
通讯作者: Liuchun Yang
基金资助:
Supported by the Science and Technology Plan Project of Hunan Province (2013FJ3034), the Open Foundation of the Innovation Platform in Higher Education of Hunan Province (12K051), and the programs of Xiangtan University (2011XZX12, 2010QDZ37).

Exploration of As(III)/As(V) Uptake from Aqueous Solution by Synthesized Calcium Sulfate Whisker

Xiaojuan Chen, Liuchun Yang, Junfeng Zhang, Yan Huang

Key Laboratory of Heavy Metal Pollution Control of Hunan Province, Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, China

Received:2013-05-16 Revised:2013-11-11 Online:2014-12-28 Published:2014-12-24
Supported by:
Supported by the Science and Technology Plan Project of Hunan Province (2013FJ3034), the Open Foundation of the Innovation Platform in Higher Education of Hunan Province (12K051), and the programs of Xiangtan University (2011XZX12, 2010QDZ37).

摘要/Abstract

摘要： Although common calcium-containing minerals such as calcite and gypsum may fix arsenic, the interaction betweenmodified calcic minerals and arsenic has seldombeen reported. The uptake behavior of As(III)/As(V) from aqueous solutions by calcium sulfate whisker (CSW, dihydrate or anhydrite) synthesized through a cooling recrystallization method was explored. A series of batch experiments were conducted to examine the effect of pH, reaction time, whisker dosage, and initial As concentration. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the samples prepared. The results showed that pH of the aqueous solution was an important parameter for As(III)/As(V) uptake, and an excellent removal efficiency could be achieved under strongly alkaline condition. The data from batch experiments for reaction of As(V) with calcium sulfate dihydrate whisker (CSDW) and calcium sulfate anhydrous whisker (CSAW) were well described with extended Langmuir EXT1 model, from which theoretic maximum adsorption capacity of 46.57 mg As(V)·(g CSDW)^-1 and 39.18 mg As(V)·(g CSAW)^-1 were obtained. Some calcium arsenate solids products, such as CaAsO₃(OH) (weilite, syn), Ca₃(AsO₄)₂ (calcium arsenate), CaO-As₂O₅, Ca-As-O, Ca₅(AsO₄)₃OH·xH₂O (calcium arsenate hydroxide hydrate), and CaH(AsO₄)·2H₂O (hydrogen calcium arsenic oxide hydrate), were detected at pH = 12.5 through XRD analysis. This indicates that the interaction mechanism between As(V) and CSWis a complex adsorption process combined with surface dissolution and chemical precipitation.

关键词: Calcium sulfate whisker, Arsenic, Solution pH, Adsorption-precipitation, Calcium arsenate

Abstract: Although common calcium-containing minerals such as calcite and gypsum may fix arsenic, the interaction betweenmodified calcic minerals and arsenic has seldombeen reported. The uptake behavior of As(III)/As(V) from aqueous solutions by calcium sulfate whisker (CSW, dihydrate or anhydrite) synthesized through a cooling recrystallization method was explored. A series of batch experiments were conducted to examine the effect of pH, reaction time, whisker dosage, and initial As concentration. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the samples prepared. The results showed that pH of the aqueous solution was an important parameter for As(III)/As(V) uptake, and an excellent removal efficiency could be achieved under strongly alkaline condition. The data from batch experiments for reaction of As(V) with calcium sulfate dihydrate whisker (CSDW) and calcium sulfate anhydrous whisker (CSAW) were well described with extended Langmuir EXT1 model, from which theoretic maximum adsorption capacity of 46.57 mg As(V)·(g CSDW)^-1 and 39.18 mg As(V)·(g CSAW)^-1 were obtained. Some calcium arsenate solids products, such as CaAsO₃(OH) (weilite, syn), Ca₃(AsO₄)₂ (calcium arsenate), CaO-As₂O₅, Ca-As-O, Ca₅(AsO₄)₃OH·xH₂O (calcium arsenate hydroxide hydrate), and CaH(AsO₄)·2H₂O (hydrogen calcium arsenic oxide hydrate), were detected at pH = 12.5 through XRD analysis. This indicates that the interaction mechanism between As(V) and CSWis a complex adsorption process combined with surface dissolution and chemical precipitation.

Key words: Calcium sulfate whisker, Arsenic, Solution pH, Adsorption-precipitation, Calcium arsenate

Xiaojuan Chen, Liuchun Yang, Junfeng Zhang, Yan Huang. Exploration of As(III)/As(V) Uptake from Aqueous Solution by Synthesized Calcium Sulfate Whisker[J]. , 2014, 22(11/12): 1340-1346.

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Exploration of As(III)/As(V) Uptake from Aqueous Solution by Synthesized Calcium Sulfate Whisker

Exploration of As(III)/As(V) Uptake from Aqueous Solution by Synthesized Calcium Sulfate Whisker

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