高岭土合成分子筛去除矿山废水中的Cd^(2+)和Co^(2+)  

Removal of Cd^(2+)and Co^(2+)from Mine Wastewater by Kaolin Synthetic Zeolite

作　　者：尹丽娟 文勇莉 翟红阳 潘学军[1] 杨本芹 YIN Lijuan;WEN Yongli;ZHAI Hongyang;PAN Xuejun;YANG Benqin(School of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650500

出　　处：《环境科学与技术》2025年第4期104-112,共9页Environmental Science & Technology

基　　金：云南省重点研发计划项目:赤水河流域绿色治理和发展技术研究及应用示范(202203AC100001)。

摘　　要：文章使用低成本高岭土碱改性后通过水热法合成了Na-P型分子筛,采用批量实验探究了分子筛对Cd^(2+)和Co^(2+)的吸附行为。结果表明Cd^(2+)和Co^(2+)的吸附平衡时间为160 min和150 min,吸附都遵循拟二级动力学模型;Cd^(2+)和Co^(2+)的等温吸附过程都遵循Langmuir等温线模型;在Cd^(2+)和Co^(2+)的竞争实验中,竞争性为Cd^(2+)>Co^(2+);Na+的加入抑制了分子筛对Cd^(2+)和Co^(2+)的吸附,说明离子交换在吸附过程中占据了重要位置;NaCl对分子筛具有良好的再生作用,6次吸附-解吸后仍然有较高的再生率。当Cd^(2+)和Co^(2+)的初始pH为6时,分子筛对Cd^(2+)和Co^(2+)的去除率最高,分别为77.42%和92.26%,去除机理主要为离子交换、静电吸引和配位作用。因此,分子筛在去除矿山废水中Cd^(2+)和Co^(2+)方面具有很大的应用前景。Na-P zeolite were synthesized via a hydrothermal method following the alkali modification of low-cost kaolin.The adsorption behaviors of Cd^(2+)and Co^(2+)were examined through batch experiments.The results showed that the adsorption equilibrium times for Cd^(2+)and Co^(2+)were 160 min and 150 min,respectively,with the adsorption kinetics fitting the pseudosecond-order model.The isothermal adsorption of Cd^(2+)and Co^(2+)followed the Langmuir model,in competitive adsorption experiments,Cd^(2+)demonstrated stronger adsorption than Co^(2+).The presence of Na+ions inhibited the adsorption of both Cd^(2+)and Co^(2+),indicating that ion exchange was a key mechanism.NaCl was effective in regenerating the molecular sieves,with high regeneration efficiency sustained over six adsorption-desorption cycles.The highest removal rates for Cd^(2+)(77.42%)and Co^(2+)(92.26%)were achieved at an initial pH of 6.The dominant removal mechanisms were ion exchange,electrostatic attraction,and coordination.These results suggest that Na-P zeolite have strong potential for the removal of Cd^(2+)and Co^(2+)from mine wastewater.

关 键 词：分子筛 吸附 重金属 再生 

分 类 号：X703.1[环境科学与工程—环境工程]