Fluoride recovery using porous calcium silicate hydrates via spontaneous Ca2+ and OH- release

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	Fluoride recovery using porous calcium silicate hydrates via spontaneous Ca2+ and OH- release
	Guan, Wei; Zhao, Xu
刊名	SEPARATION AND PURIFICATION TECHNOLOGY
	2016-06-13
卷号	165 期号:0 页码:71-77
关键词	Fluoride recovery Porous calcium silicate hydrates Calcium fluoride Ion exchange
英文摘要	In the present study, porous calcium silicate hydrates (P-CSH) was prepared from CaO and soluble sodium silicate via a hydrothermal method and used for fluoride ions recovery. In comparison with the crystalline calcium silicate hydrates (C-CSH), P-CSH, which has large specific surface areas of 148.11 m(2)/g, a high Ca/Si molar ratio of 2.28 and low crystallinity, exhibited a high capacity for fluoride recovery from synthetic and practical electroplating wastewater. Fluoride recovery by P-CSH continued spontaneously at pH range of 6.4-7.4 without an extra pH adjustment. The fast Ca2+ dissolution rate of P-CSH was favorable for the fluoride precipitation with free Ca2+. Compared with the C-CSH, P-CSH exhibited massive Ca-OH linkages, which enhanced the fluoride removal capacity by forming insoluble CaF2. Based on the analysis of the P-CSH samples before and after fluoride recovery by SEM, XRD, FTIR techniques, it was concluded that the surface Ca-OH was active sites and the quantitative substitution of Ca-OH groups by F- played a key role in F- ion exchange. The fluoride recovery efficiency of P-CSH is 79.6%. The present study demonstrated a good potential of P-CSH for the fluoride recovery. (C) 2016 Elsevier B.V. All rights reserved.
收录类别	SCI
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/36042]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Guan, Wei,Zhao, Xu. Fluoride recovery using porous calcium silicate hydrates via spontaneous Ca2+ and OH- release[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2016,165(0):71-77.
APA	Guan, Wei,&Zhao, Xu.(2016).Fluoride recovery using porous calcium silicate hydrates via spontaneous Ca2+ and OH- release.SEPARATION AND PURIFICATION TECHNOLOGY,165(0),71-77.
MLA	Guan, Wei,et al."Fluoride recovery using porous calcium silicate hydrates via spontaneous Ca2+ and OH- release".SEPARATION AND PURIFICATION TECHNOLOGY 165.0(2016):71-77.