摘要
利用多孔粉煤灰(CFA)为载体制备粉煤灰/二氧化锰(CFA@MnO2)复合材料,用以吸附废水中Pb(Ⅱ)。静态吸附试验结果表明:负载MnO2后,粉煤灰对Pb(Ⅱ)吸附效果显著提高。CFA@MnO2对Pb(Ⅱ)吸附动力学符合准二级动力学模型,等温吸附过程符合Langmuir单层吸附模型,最大吸附量为89.28 mg/g。热力学参数ΔH0为18.916 kJ/mol,且ΔG0<0,表明吸附过程是吸热的且自发进行。
The composite of coal fly ash/manganese dioxide(CFA@MnO2)was prepared by loading MnO2 on porous coal fly ash(CFA),which can be used to adsorb the Pb(Ⅱ)in waste water.Static adsorption experiments show that CFA@MnO2 exhibits better adsorption performance towards Pb(Ⅱ)than CFA.The adsorption of Pb(Ⅱ)by CFA@MnO2 follows a pseudo second order kinetics model and its adsorption isotherm fits well to Langmuir model(monolayer adsorption).The maximum adsorption capacity is found to be 89.28 mg/g.The thermodynamic parameter ofΔH0 is calculated to be 18.916 kJ/mol whileΔG0<0,indicating that the adsorption process is endothermic and spontaneous in nature.
作者
易龙生
李晓慢
刘苗
刘涛
吴倩
YI Long sheng;LI Xiao man;LIU Miao;LIU Tao;WU Qian(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China)
出处
《矿冶工程》
CAS
CSCD
北大核心
2019年第5期133-136,143,共5页
Mining and Metallurgical Engineering
关键词
废水处理
重金属废水
粉煤灰
二氧化锰
Pb(Ⅱ)
吸附
动力学
热力学
waste water treatment
heavy metal waste water
coal fly ash
MnO2
Pb(Ⅱ)
adsorption
kinetics
thermodynamics
