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Enhanced arsenite removal from water by Ti(SO4)(2) coagulation
Sun, Yuankui; Zhou, Gongming; Xiong, Xinmei; Guan, Xiaohong; Li, Lina; Bao, Hongliang
2013
Source PublicationWATER RESEARCH
ISSN0043-1354
Volume47Issue:13Pages:CONCATENATE(Sheet1!I115,-Sheet1!J115)
AbstractCoagulation with the conventional coagulants such as ferric and aluminum salts is not efficient for As(III) removal. In this study Ti(SO4)(2) was employed for enhanced As(III) removal and Fe-2(SO4)(3) was used as a reference. The removal efficiencies of As(III) by Ti(SO4)(2) at pH 4.0-9.0 were greater than that by Fe-2(SO4)(3) by 7.39-32.8% and 3.14-48.1% for coagulants dosed at 8.0 mg/L and 12.0 mg/L, respectively. The advantage of Ti(SO4)(2) over Fe-2(SO4)(3) for As(III) removal was more significant at lower pH, which may be ascribed to the more negatively charged surface of Ti(IV) hydroxides. To reduce As(III) from 0.2 mg/L to 10 mu g/L, the necessary dosage of Ti(SO4)(2) was only similar to 50% of that of Fe-2(SO4)(3). The adsorption capacity of As(III) on Ti(IV) hydroxides formed in-situ was greater than that on Fe(III) hydroxides formed in-situ by 100 mg/g and several times higher than the adsorption capacities of TiO2 for As(III) reported in the literature. The presence of competing anions, silicate, phosphate and humic acid, did not alter the advantage of Ti(SO4)(2) over Fe-2(SO4)(3) for arsenite removal. Replacing partial Ti(SO4)(2) with Fe-2(SO4)(3) (same dosage) and applying them sequentially could achieve similar As(III) removal efficiency as single Ti(SO4)(2), which could thus reduce the chemical cost. The extended X-ray absorption fine structure (EXAFS) spectroscopy indicated that As(III) form bidentate binuclear surface complexes with Ti(IV) hydroxides as evidenced by As(III)-Ti bond distances of 3.33-3.35 angstrom. This study revealed that Ti(SO4)(2) may be an alternative coagulant for efficient As(III) removal. (C) 2013 Elsevier Ltd. All rights reserved.
Indexed BySCI
Language英语
Funding Project应物所项目组
WOS IDWOS:000323240100015
Citation statistics
Cited Times:45[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/13742
Collection中科院上海应用物理研究所2011-2020年
Recommended Citation
GB/T 7714
Sun, Yuankui,Zhou, Gongming,Xiong, Xinmei,et al. Enhanced arsenite removal from water by Ti(SO4)(2) coagulation[J]. WATER RESEARCH,2013,47(13):CONCATENATE(Sheet1!I115,-Sheet1!J115).
APA Sun, Yuankui,Zhou, Gongming,Xiong, Xinmei,Guan, Xiaohong,Li, Lina,&Bao, Hongliang.(2013).Enhanced arsenite removal from water by Ti(SO4)(2) coagulation.WATER RESEARCH,47(13),CONCATENATE(Sheet1!I115,-Sheet1!J115).
MLA Sun, Yuankui,et al."Enhanced arsenite removal from water by Ti(SO4)(2) coagulation".WATER RESEARCH 47.13(2013):CONCATENATE(Sheet1!I115,-Sheet1!J115).
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