化工环保2023，Vol.43Issue(6)：813-820,8.DOI:10.3969/j.issn.1006-1878.2023.06.014
赤泥合成4A分子筛及吸附去除水中Cu2+和Mn2+的机理
Synthesis of 4A zeolite from red mud and mechanism of adsorption removal of Cu2+and Mn2+from water
摘要
Abstract
High-purity single-crystal phase 4A zeolite was synthesized by alkali melting-hydrothermal crystallization method using red mud as raw material and used for the adsorption and removal of Cu2+and Mn2+from water.The experimental results show that:Under the conditions of adsorption temperature 25 ℃,adsorbent amount 1.0 g/L and without solution pH adjustment,the maximum adsorption amount of 4A zeolite for Cu2+and Mn2+are 210.3 mg/g and 167.0 mg/g,respectively,and when the initial mass concentration of Cu2+and Mn2+is 200 mg/L and 100 mg/L,the removal rate is 98.67％and 97.34％,respectively;The 4A zeolite has good stability and reusability,and the adsorption amount remains almost the same after 5 cycles.SEM-EDS,FTIR,XRD and XPS characterization results show that the adsorption mechanism of 4A zeolite for Cu2+is ion exchange,Cu2+hydrolysis on the surface of 4A zeolite to produce copper hydroxide precipitate and Cu binding to O in the skeleton structure of 4A zeolite to form chemical bond(Cu-O),and the adsorption mechanism of 4A zeolite for Mn2+is mainly ion exchange.The affinity of 4A zeolite for Cu2+is better than that for Mn2+,and Cu2+is preferentially adsorbed when the two coexist.关键词
赤泥/4A分子筛/吸附/重金属离子Key words
red mud/4A zeolite/adsorption/heavy metal ion分类
资源环境引用本文复制引用
刘耀东,叶翠平,韩丽媛,梁美生..赤泥合成4A分子筛及吸附去除水中Cu2+和Mn2+的机理[J].化工环保,2023,43(6):813-820,8.基金项目
国家自然科学基金项目(21776192). （21776192）
