As(V) and As(III) removal from water by a Ce-Ti oxide adsorbent: Behavior and mechanism
As(V) and As(III) removal from water by a Ce-Ti oxide adsorbent: Behavior and mechanism
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DOI：
10.1016/j.cej.2010.04.039
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发表时间：
2010-07-01
影响因子：
15.1
通讯作者：
Lim, Veronica Chao
中科院分区：
文献类型：
--
作者：
Li, Zhijian;Deng, Shubo;Lim, Veronica Chao
由于As(V)和As（III）通常同时存在于地下水中，因此合成既能去除As(V)又能去除As（III）的新型吸附剂是很有吸引力的。本文采用两步法成功制备了一种对As(V)和As（III）具有高吸附能力的Ce-Ti杂化氧化物吸附剂。环境扫描电镜（ESEM）结果表明，Ce-Ti氧化物吸附剂由100 ~ 200 nm大小的纳米颗粒组成。吸附等温线表明，在平衡砷浓度为10 μ g/L时，粉末吸附剂对As(V)和As（III）的吸附量分别为7.5 mg/g和6.8 mg/g，高于大多数报道的吸附剂。吸附剂对As(V)的吸附在pH < 7时达到最佳，对As（III）的吸附在pH为中性时达到最佳。傅里叶变换红外（FTIR）分析表明，吸附剂表面的羟基参与了砷的吸附，而x射线光电子能谱（XPS）进一步证明了羟基参与了吸附，并在吸附剂表面形成了单齿和双齿配合物。(C) 2010 Elsevier BM。版权所有。
Since As(V) and As(III) usually occur in groundwater simultaneously, the synthesis of novel adsorbents for both As(V) and As(III) removal is attractive. In this paper, a Ce-Ti hybrid oxide adsorbent with high sorption capacities for As(V) and As(III) was successfully prepared using a two-step reaction. Environmental scanning electron microscopy (ESEM) revealed that the Ce-Ti oxide adsorbent was composed of nanoparticles in the size range of 100-200 nm. Sorption isotherms show that the powdered adsorbent had high sorption capacity up to 7.5 mg/g for As(V) and 6.8 mg/g for As(III) at the equilibrium arsenic concentration of 10 mu g/L, higher than most reported adsorbents. The optimum adsorption capacity on the adsorbent was achieved at pH below 7 for As(V) and at neutral pH for As(III). Fourier transform infrared (FTIR) analysis indicated that the hydroxyl groups on the adsorbent surface were involved in arsenic adsorption, while X-ray photoelectron spectroscopy (XPS) provided further evidence for the involvement of hydroxyl groups in the sorption and the formation of monodentate and bidentate complexes on the adsorbent surface. (C) 2010 Elsevier BM. All rights reserved.