摘要
将硫酸钙作为添加剂与污泥共热解制备硫酸钙/污泥基生物炭(SBC),并使用BET、SEM、FTIR和XRD表征,研究了其对Pb^(2+)的吸附去除特性。结果表明,硫酸钙已负载在生物炭表面并对去除Pb^(2+)有促进作用。当温度为25℃,初始pH为5,SBC投加量为0.4 g/L,吸附时间为240 min时,Pb^(2+)去除率可达99.69%。Langmuir等温吸附模型能更好地描述SBC对Pb^(2+)的吸附过程,最大吸附量为280.899 mg/g;SBC对Pb^(2+)的吸附更符合准二级动力学模型,该吸附过程可能以化学吸附为主;热力学分析表明SBC对Pb2+的吸附是自发的吸热过程,升温有利于吸附。
Calcium sulfate/sludge based biochar(SBC)was prepared by co-pyrolysis of calcium sulfate and sludge,and characterized by BET,SEM,FTIR and XRD.Its adsorption and removal characteristics of Pb^(2+)were studied.The results showed that calcium sulfate was loaded on the surface of biochar and promoted the removal of Pb2+.With the condition of temperature 25℃,the initial pH 5,the dosage of SBC 0.4 g/L and the adsorption time 240 min,the removal ratio of Pb^(2+)could reach 99.69%.Langmuir model can better describe the adsorption process of SBC to Pb^(2+),and the maximum adsorption capacity is 280.899 mg/g.Moreover,the adsorption process of Pb^(2+)is more in line with the quasi second-order kinetic model,which indicates that the adsorption process may be dominated by chemical adsorption.The thermodynamic analysis shows that the adsorption of Pb^(2+)by SBC is a spontaneous endothermic process,and the temperature rise is favorable for adsorption.
作者
刘睿
刘立恒
黄蓉
刘秀
Liu Rui;Liu Liheng;Huang Rong;Liu Xiu(College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin 541004,China;Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin University of Technology,Guilin 541004,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2021年第5期46-52,共7页
Industrial Water Treatment
基金
国家自然科学基金重点项目(51638006)
广西高等学校高水平创新团队及卓越学者计划项目(002401013001)
广西重点实验室研究基金项目(桂科能1401Z004,桂科能1801Z009)
广西“八桂学者”岗位专项经费项目。
关键词
污泥基生物炭
铅
吸附
动力学
热力学
sludge based biochar
lead
adsorption
kinetics
thermodynamics
