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氨基化碳化凹凸棒石的水热制备及对水中Cr(Ⅵ)的吸附性能
作者:王诗生1 2 盛广宏1 2 宋西珍1 王萍1 2 于冬冬1 练建军1 2 
单位:1. 安徽工业大学能源与环境学院 安徽 马鞍山243032  2. 安徽工业大学 生物膜法水质净化及利用技术教育部工程研究中心 安徽 马鞍山243032 
关键词:凹凸棒石 葡萄糖 氨水 六价铬 吸附-还原 
分类号:X703
出版年,卷(期):页码:2018,46(5):0-0
DOI:
摘要:
以凹凸棒石(AT)为导向硬模板,葡萄糖和氨水为原料,采用水热碳(C)化法一步制备出氨基化碳化凹凸棒石复合粉体,并用扫描电子显微镜、Fourier红外光谱、元素分析、Zeta电势、Raman光谱、热重分析对复合粉体进行表征分析,研究复合粉体对水中Cr(Ⅵ)的吸附-还原性能。结果表明:氨基化碳化凹凸棒石复合粉体表面富含含氧基团(如羟基、羧基、酮基等)及氨基等活性基团。复合粉体对Cr(Ⅵ)和总铬去除率显著高于碳化凹凸棒石和AT,但和活性炭没有显著差异。复合粉体对Cr(Ⅵ)去除率显著高于总铬,表明复合粉体具有一定的还原性能;Cr(Ⅵ)和总铬去除率均随着Na2SO4浓度的增加而减小。对总铬的吸附动力学过程符合准二级动力学模型。对总铬吸附过程适合用Langmuir模型来描述,在288、298、308、318和328 K时,最大吸附量分别为81.5、92.6、109.9、120.5 和132.7 mg/g。在研究的温度范围内,Gibbs自由能变为?16.5~ ?20.8 kJ/mol,焓变为15.6 kJ/mol,熵变为110.9~114.1 J/(mol·K),表明该吸附是自发、吸热和熵增过程。 
 
基金项目:
基金项目:国家自然科学基金(41401553,51709001)资助项目。
作者简介:
第一作者:王诗生(1975—),男,博士,副教授。
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