中南大学学报（自然科学版）2025，Vol.56Issue(6)：2169-2179,11.DOI:10.11817/j.issn.1672-7207.2025.06.003
木质素螯合吸附剂的制备及其在高原铜矿山淋溶水中的应用
Preparation of lignin chelating adsorbent and its application in leaching water of plateau copper mine
摘要
Abstract
Based on the Mannich reaction,the lignin chelating adsorbent was produced from lignin sulfate of coniferous wood,formaldehyde,and iminodiacetic acid which could be utilized for copper removal from copper sulfate solution.Both its structure and thermal stability were characterized by elemental analysis,infrared spectroscopy and thermal analysis.The effects of pH,temperature and Cu2+concentration on adsorption capacity of adsorbents were investigated,and the kinetics was studied.The results show that the adsorption capacity,whose saturated value of Cu2+is 43.9 mg/g,increases with the increase of pH,temperature and Cu2+concentration,and the adsorption rate is higher at high temperatures.This process is more consistent with Langmuir equilibrium model at 15 ℃ and primarily conducted by monomolecular layer chemical adsorption.The adsorption is in line with pseudo-first-order kinetics model and controlled by liquid film diffusion at 10 ℃ where it conforms to pseudo-second-order kinetics model at 25 ℃.Additionally,the intra-particle diffusion can be divided into three stages,i.e.,fast adsorption,slow adsorption and and near-equilibrium state.The adsorption efficiency decreases when pH is between 2-4,the selectivity coefficient of Cu2+/Ca2+and Cu2+/Mg2+is more than 500 and pH is 3.Ultimately,the desorption efficiency will reach 85％while it is desorbed with dilute sulfuric acid.The lignin chelating adsorbent can be effectively applied in leaching solution treatment and copper recovery of copper mines at high altitudes.关键词
木质素螯合吸附剂/Mannich反应/淋溶水/铜离子Key words
lignin chelating adsorbent/Mannich reaction/leaching water/copper ion分类
资源环境引用本文复制引用
吴健辉,廖元杭..木质素螯合吸附剂的制备及其在高原铜矿山淋溶水中的应用[J].中南大学学报（自然科学版）,2025,56(6):2169-2179,11.基金项目
国家自然科学基金资助项目(52121004)(Project(52121004)supported by the National Natural Science Foundation of China) （52121004）
