复合生物炭对含镉模拟废水中Cd^(2+)的吸附性能研究  

Study on Adsorption Properties of Cd^(2+) in Cd-containing Simulated Wastewater with Biochar Composite Adsorbent

作　　者：刘泽浩 代淑娟 贾春云[2,3] 巩宗强[2,3] 李晓军[2,3] LIU Zehao;DAI Shujuan;JIA Chunyun;GONG Zongqiang;LI Xiaojun(School of Mining Engineering,University of Science and Technology Liaoning,Anshan 114051,China;Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China;Key Laboratory of Pollution Ecology and Environmental Engineering,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]辽宁科技大学矿业工程学院,辽宁鞍山114051 [2]中国科学院沈阳应用生态研究所,辽宁沈阳110016 [3]中国科学院污染生态与环境工程重点实验室,辽宁沈阳110016

出　　处：《金属矿山》2023年第5期314-319,共6页Metal Mine

基　　金：中国科学院沈阳应用生态研究所重大项目(编号:IAEMP202201);沈阳市中青年科技人才支持计划项目(编号:RC200123);辽宁省自然科学基金项目(编号:2021-MS-027)。

摘　　要：为解决水体中镉离子污染以及固废基材料资源化利用的问题,以小麦秸秆与硼泥等量混合在700℃(氮气驱氧)下煅烧2 h,制备复合生物炭吸附材料(BBm);以BBm为吸附剂,对Cd^(2+)浓度200 mg/L的含镉模拟废水进行Cd^(2+)吸附研究。单因素试验结果表明,随着BBm用量、溶液pH、转速以及吸附反应时间的增加,BBm对Cd^(2+)去除率升高,直至吸附平衡后,去除率稳定;正交试验结果表明,各因素影响由强到弱依次为溶液初始pH值、BBm用量、振荡转速、反应时间,在室温(约25℃)、BBm用量为0.5 g、pH值为8、转速为200 r/min的条件下,对100 mL模拟废水(含镉200 mg/L)吸附180 min,获得去除率99.99%的良好指标;吸附等温拟合结果表明,BBm对Cd^(2+)的吸附过程符合Langmuir等温吸附模型,准二级动力学模型能更好地拟合该吸附过程。In order to solve the problems of cadmium ion pollution in water bodies and the resource utilization of solid waste based materials,wheat straw and boron sludge were mixed in equal amounts and calcined at 700℃(nitrogen oxygen dis-placement)for 2 h to prepare composite biochar adsorption material(BBm).Using BBm as adsorbent,simulated wastewater containing cadmium with a Cd^(2+)concentration of 200 mg/L was studied for adsorption.The results of the single-factor test re-sults showed that with the increase of BBm dosage,solution pH,speed and adsorption reaction time,the removal rate of Cd^(2+)by BBm increased until the removal rate no longer increased after the adsorption equilibrium.The orthogonal test results showed that the strength of each factor was as following:solution initial pH value,BBm dosage,speed and reaction time,and 100 mL of simulated wastewater(the concentration of cadmium is 200 mg/L)was adsorbed for 180 min at room temperature(about 25℃),BBm dosage of 0.5 g,pH value of 8 and speed of 200 r/min,and a good index of removal rate of 99.99%was obtained.The results of adsorption isothermal fitting showed that the adsorption process of BBm to Cd^(2+)was in line with the Langmuir i-sothermal adsorption model,and the quasi-secondary kinetic model could better fit the adsorption process.

关 键 词：重金属离子 含镉废水 生物炭 硼泥 吸附 

分 类 号：X703[环境科学与工程—环境工程]