Iodide adsorption from aqueous solutions by bis(trimethoxysilylpropyl)amine polycondensate/silver chloride composites

ISL OpenIR > 青海盐湖研究所知识仓储

	Iodide adsorption from aqueous solutions by bis(trimethoxysilylpropyl)amine polycondensate/silver chloride composites
	Zhang, Huifang1,2 ; Hu, Yaoqiang 1,2; Ye, Xiushen1 ; Liu, Haining1 ; Li, Quan1 ; Guo, Min1,2 ; Wu, Zhijian1
	2013-05-01
发表期刊	DESALINATION AND WATER TREATMENT
卷号	51 期号:19-21 页码:3930-3937
关键词	Iodide Adsorption Bis(Trimethoxysilylpropyl)Amine Polycondensate Silver Chloride
摘要	Composite adsorbents for iodide were prepared with AgCl as an adsorption active component and bis(trimethoxysilylpropyl)amine (TSPA) as a gel precursor. The prepared composite adsorbents were used to adsorb iodide from aqueous solutions by considering the effects of initial iodide concentration, temperature, initial solution pH, and coexisting NaCl. The loading of AgCl in the prepared composite adsorbents was 5.5 mmol/g, much higher than that in the reported silver or silver chloride-impregnated activated carbon (around 0.097 mmol/g). The high AgCl loading ensures that the prepared composite adsorbents have a high adsorption capacity. At the initial adsorption stage of 0-12 h, the adsorption rate increases with increasing initial iodide concentration from 2 to 8 mmol/L. When the initial iodide concentration further increases from 8 to 14 mmol/L, the adsorption rate does not have an obvious increase. Pseudo-second-order model fits the experimental kinetic data quite well. The initial adsorption rate increases greatly from 1.97 to 7.32 mmol g(-1) h(-1) as adsorption temperature rises from 25 to 55 degrees C. The equilibrium adsorption amount is insensitive to solution pH and coexisting NaCl, but it increases slightly with the increasing adsorption temperature. The adsorption isotherms are of H2 type, indicating that the adsorption is chemical adsorption. The comparison of the energy dispersive spectroscopy (EDS) spectra and X-ray diffraction (XRD) patterns of the composite adsorbents before and after adsorption shows that after adsorption, all AgCl in the original adsorbents changes into AgI, confirming the chemical nature of the adsorption. The composite adsorbents prepared in this work have a high adsorption capacity, a good selectivity, and good chemical and mechanical stabilities. They are very suitable for the adsorption of iodide form aqueous solutions.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/4456
专题	青海盐湖研究所知识仓储盐湖资源与化学实验室
作者单位	1.Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Salt Lake Resources & Chem, Xining 810008, Peoples R China 2.Grad Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Huifang,Hu, Yaoqiang,Ye, Xiushen,et al. Iodide adsorption from aqueous solutions by bis(trimethoxysilylpropyl)amine polycondensate/silver chloride composites[J]. DESALINATION AND WATER TREATMENT,2013,51(19-21):3930-3937.
APA	Zhang, Huifang.,Hu, Yaoqiang.,Ye, Xiushen.,Liu, Haining.,Li, Quan.,...&Wu, Zhijian.(2013).Iodide adsorption from aqueous solutions by bis(trimethoxysilylpropyl)amine polycondensate/silver chloride composites.DESALINATION AND WATER TREATMENT,51(19-21),3930-3937.
MLA	Zhang, Huifang,et al."Iodide adsorption from aqueous solutions by bis(trimethoxysilylpropyl)amine polycondensate/silver chloride composites".DESALINATION AND WATER TREATMENT 51.19-21(2013):3930-3937.