生物质吸附剂吸附回收硫脲废液中金的研究  

Adsorption and Recovery of Gold from Waste Thiourea Liquid by Biomass-Based Adsorbent

作　　者：姚丽 钟盛文[1,2] YAO Li;ZHONG Shengwen(Faculty of Materials,Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Jiangxi Key Laboratory of Power Batteries and Materials,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)

机构地区：[1]江西理工大学材料冶金化学学部,江西赣州341000 [2]江西理工大学江西省动力电池及材料重点实验室,江西赣州341000

出　　处：《矿冶工程》2024年第4期223-228,共6页Mining and Metallurgical Engineering

基　　金：江西省重大科技研发专项“揭榜挂帅”项目(20213AAE02010)。

摘　　要：提出一种以毛竹为原料制备生物质吸附剂、选择性地从硫脲废液中吸附回收金的方法。竹炭在H_(2)O-CO_(2)气氛中活化后表面的纳米孔洞比单独使用CO_(2)活化的活性炭孔洞数量更多且尺寸更小,大大增加了吸附材料的比表面积。探究了吸附材料种类、pH值、吸附剂用量、吸附温度、吸附时间对硫脲废液中金吸附脱除的影响,得到适宜的吸附条件为:pH=6、吸附剂用量8 g/L、吸附温度25℃、时间3.5 h,其中采用H_(2)O-CO_(2)协同活化的活性炭吸附效果较好,可吸附脱除硫脲废液中96%以上的金。采用吸附等温模型拟合了H_(2)O-CO_(2)协同活化的活性炭在硫脲废液中吸附金的过程,结果表明,协同活化的活性炭吸附硫脲废液中金的过程更符合Freundlich模型,为物理吸附过程。A method of selective adsorption and recovery of gold from waste thiourea liquid with biomass-based adsorbent prepared from phyllostachys pubescens was proposed.The charcoal,after being activated in H_(2)O-CO_(2)atmosphere,has more nanopores with smaller size on its surface,compared to being activated by CO_(2)alone,which greatly increases the specific surface area of the adsorbent material.Based on exploration of the effects of factors,including type of adsorbent material,pH value,adsorbent dosage,adsorption temperature,and adsorption time,on the adsorption of gold in waste thiourea liquid,the appropriate adsorption conditions were obtained as follows:pH of 6,adsorbent dosage of 8 g/L,adsorption temperature of 25℃,and adsorption time of 3.5 h.It is found that activation in H_(2)O-CO_(2)can bring the activated carbon with better adsorption effect,and the removal rate of gold from waste thiourea liquid by adsorption can exceed 96%.The adsorption isothermal model is used to fit the process of gold adsorption from waste thiourea liquid by the carbon activated in H_(2)O-CO_(2)atmosphere,and the results show that such gold adsorption process follows Freundlich model and is a physical adsorption process.

关 键 词：吸附剂 金 竹炭 改性 活化 活性炭 硫脲废液 吸附模型 

分 类 号：TD952[矿业工程—选矿]