Lanthanum hydroxide: a highly efficient and selective adsorbent for arsenate removal from aqueous solution
Lanthanum hydroxide: a highly efficient and selective adsorbent for arsenate removal from aqueous solution
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氢氧化镧：一种高效、选择性吸附剂，用于从水溶液中去除砷酸盐
DOI：
10.1007/s11356-020-10240-1
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发表时间：
2020-07
影响因子：
5.8
通讯作者：
Jia Yongfeng
中科院分区：
文献类型：
--
作者：
Wang Yulong;Liu Yanhong;Guo Tianqi;Liu Hupeng;Li Jiale;Wang Shaofeng;Li Xuhui;Wang Xin;Jia Yongfeng
本工作采用简单的沉淀法制备了氢氧化镧吸附剂，并通过批量实验和场发射扫描电子显微镜能谱(FESEM-EDX)、Brunauer-Emmett-Teller(BET)分析、粉末X射线衍射(p-XRD)、傅里叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)等技术研究了其除砷性能和吸附机理。PH值对除砷效果的影响表明，氢氧化镧吸附剂能有效去除溶液中的As(V)，而As(III)的脱除率很低，说明该吸附剂对As(V)有选择性去除，但对As(III)没有选择性去除。等温线研究表明，在pH值为5.0和9.0时，As(V)的最大吸附容量分别为299.4 mg/g和192.3 mg/g，远高于目前广泛使用的高铁水合物。磷酸盐和柠檬酸等天然有机酸(NOA)的存在对As(V)的去除有明显的干扰。粉末X射线衍射、傅里叶变换红外光谱和X射线光电子能谱分析表明，在pH为4.0的条件下，氢氧化镧吸附As(V)后几乎转化为砷酸镧，而在pH为6.0和9.0的条件下，吸附As(V)后，氢氧化镧仍有部分残留。此外，吸附剂的羟基与As(V)之间的配体交换和内球表面络合物的形成可能对砷的去除起到核心作用，这一点有待进一步研究。
In the present work, a lanthanum hydroxide adsorbent was prepared by a simple precipitation process, and its arsenic removal performances and adsorption mechanisms were investigated by batch experiments and various techniques including field emission scanning electron microscopy with energy-dispersive X-ray spectrophotometry (FESEM–EDX), Brunauer–Emmett–Teller (BET) analysis, powder X-ray diffraction (p-XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The influence of pH on arsenic removal showed that the lanthanum hydroxide adsorbent can effectively remove As(V) from solution, whereas the As(III) removal was very low, indicating that the lanthanum hydroxide adsorbent can selectively remove As(V) but not As(III). The isotherm study showed that the maximum adsorption capacities of As(V) at pH 5.0 and 9.0 were 299.4 and 192.3 mg/g, respectively, much higher than those of the widely used ferrihydrite. Significant interference on As(V) removal was caused by the presence of phosphate and natural organic acids (NOAs), such as citric acid. Powder XRD, FTIR, and XPS analysis showed that the lanthanum hydroxide was almost transformed into lanthanum arsenate after As(V) adsorption at pH 4.0, while a portion of lanthanum hydroxide remained after As(V) adsorption at pH 6.0 and 9.0. Furthermore, ligand exchange between the hydroxyl groups of the adsorbent and As(V) and the formation of inner-sphere surface complexes could play a central role in arsenic removal which needs further investigation.
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影响因子：
12.8
作者：
Gaosheng Zhang;J. Qu;Huijuan Liu;Ruiping Liu;Rong-cheng Wu
通讯作者：
Gaosheng Zhang;J. Qu;Huijuan Liu;Ruiping Liu;Rong-cheng Wu
影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
11.4
作者：
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通讯作者：
Lo, Irene M. C.
影响因子：
4.2
作者：
V. Rathore;P. Mondal
通讯作者：
V. Rathore;P. Mondal