Mn-Ce oxide as a high-capacity adsorbent for fluoride removal from water
Mn-Ce oxide as a high-capacity adsorbent for fluoride removal from water
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云辅助工业网络物理系统：见解
DOI：
10.1016/j.jhazmat.2010.12.024
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发表时间：
2011-02-28
影响因子：
13.6
通讯作者：
Yu, Gang
中科院分区：
文献类型：
--
作者：
Deng, Shubo;Liu, Han;Yu, Gang
采用共沉淀法制备了一种新型的锰铈氧化物吸附剂，并将其与拟薄水铝石混合煅烧，制备出颗粒状吸附剂。高分辨率透射电子显微镜（TEM）图像显示Mn-Ce吸附剂由约4.5 nm的晶体组成，X射线衍射（XRD）分析表明Mn物种进入CeO 2晶格形成固溶体。Mn-Ce吸附剂的表面羟基密度高达15.3 mmol g（-1），这是其对氟化物高吸附容量的主要原因。吸附等温线表明，在平衡氟浓度为1 mg L-1时，粉末和颗粒吸附剂对氟的吸附容量分别为79.5和45.5 mg g（-1），远高于已报道的吸附剂。此外，在初始1 h内吸附速度较快.傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）分析表明，吸附剂表面的羟基参与了氟的吸附。氟离子在Mn-Ce氧化物吸附剂上的吸附过程既有阴离子交换作用，也有静电作用。(C)2010爱思唯尔有限公司版权所有。
A novel Mn-Ce oxide adsorbent with high sorption capacity for fluoride was prepared via co-precipitation method in this study, and the granular adsorbent was successfully prepared by calcining the mixture of the Mn-Ce powder and pseudo-boehmite. High-resolution transmission electron microscopy (TEM) image showed that the Mn-Ce adsorbent consisted of about 4.5 nm crystals, and X-ray diffraction (XRD) analysis indicated the formation of solid solution by Mn species entering CeO2 lattices. The surface hydroxyl group density on the Mn-Ce adsorbent was determined to be as high as 15.3 mmol g(-1), mainly responsible for its high sorption capacity for fluoride. Sorption isotherms showed that the sorption capacities of fluoride on the powdered and granular adsorbent were 79.5 and 45.5 mg g(-1) respectively at the equilibrium fluoride concentration of 1 mg L-1, much higher than all reported adsorbents. Additionally, the adsorption was fast within the initial 1 h. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis revealed that the hydroxyl groups on the adsorbent surface were involved in the sorption of fluoride. Both anion exchange and electrostatic interaction were involved in the sorption of fluoride on the Mn-Ce oxide adsorbent. (C) 2010 Elsevier B.V. All rights reserved.