期刊论文

Preparation and Modification of Zeolite A and Its Adsorption Properties for Arsenic(Ⅴ) in Aqueous Solution

中文

环境科学与技术

1003-6504

2020

43

04

157-164

10.19672/j.cnki.1003-6504.2020.04.023

湖南省重点研发计划项目（2017SK2254）； 湖南省教育厅项目（15C0245）；

本校为第一机构

以聚合氯化铝生产过程中铝钙粉浸出渣为原料,通过水热晶化法制备A型沸石,并通过负载Ca~(2+)、Fe~(3+)、Cu~(2+)和Zn~(2+)对A型沸石改性,研究了A型沸石和改性沸石对溶液中As(Ⅴ)的去除效果及其结构变化。结果表明:改性沸石中n(SiO_2)/n(Al_2O_3)为2.2,其四面体骨架基本不变,其Ca、Fe、Cu和Zn含量分别为7.21%、6.61%、16.26%和4.80%,Ca、Fe、Cu和Zn物质的量之比约为2.4∶1.6∶3.4∶1。拟二级动力学方程计算得到A型沸石和改性沸石对As(Ⅴ)的平衡吸附量分别为25.69和30.53 mg/g。Langmuir吸附等温线方程计算得到A型沸石和改性沸石对As(Ⅴ)的饱和吸附量分别为57.57和106.93 mg/g,其吸附机理为表面单分...

Zeolite A was prepared by the process of hydrothermal crystallization, with calcium aluminate leaching residues (CALR) as raw material which was generated from the production process of polyaluminum chloride(PAC), and it was modified by loading Ca~(2+), Fe~(3+), Cu~(2+) and Zn~(2+). Removal effects for As(Ⅴ) from aqueous solution by modified zeolite(MZ) and Zeolite A and their structural changes were studied. The results showed that n(SiO_2)/n(Al_2O_3) in the modified zeolite was 2.2, its tetrahedral skeleton was basically unchanged, and the c...