微波共热解制备海泡石改性生物炭——响应面法优化及水体除Pb2+性能探究  

Preparation of sepiolite-modified biochar by microwave co-pyrolysis--Response surface methodology optimization and investigation of Pb(Ⅱ)removal performance in water

作　　者：李科威 蒋国民 刘永丰 高伟荣 王克勇 董芬 李茜 江卢华 刘学端[3] LI Kewei;JIANG Guomin;LIU Yongfeng;GAO Weirong;WANG Keyong;DONG Fen;LI Xi;JIANG Luhua;LIU Xueduan(Sainz Environmental Co.,Ltd,Changsha 410036,China;Nonferrous Industry Pollution Control and Equipment Engineering Research Center,Changsha 410036,China;School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China)

机构地区：[1]赛恩斯环保股份有限公司,长沙410036 [2]中国有色行业污染治理与装备工程研究中心,长沙410036 [3]中南大学资源加工与生物工程学院,长沙410083

出　　处：《环境保护科学》2025年第2期67-76,95,共11页Environmental Protection Science

基　　金：国家重点研发计划项目(2019YFC1805900)。

摘　　要：通过微波共热解法制备海泡石改性生物炭,采用响应面法Box-Behnken试验优化出最佳制备条件为热解温度430℃,热解时间1.82 h,微波功率570 W,生物质与海泡石质量比3.9:1,优化后的改性生物炭的最大Pb2+吸附量达159.32 mg/g。热解温度、微波功率和热解时间对Pb2+吸附性能存在线性影响,热解温度和微波功率、微波功率和热解时间对Pb^(2+)吸附性能存在交互影响。Langmuir吸附等温线和二级动力学模型表明Pb2+在海泡石改性生物炭上的吸附主要为基于单分子层的化学吸附,其机制包括络合、沉淀、阳离子-π作用、孔隙填充等。循环再生性能测试表明在3个周期内海泡石改性生物炭具有稳定、高效的Pb2+吸附性能。A sepiolite-modified biochar was prepared through a microwave co-pyrolysis method.The Box-Behnken test of the response surface methodology was employed to optimize the preparation conditions.The optimal preparation conditions were determined the pyrolysis temperature was 430℃,the pyrolysis time was 1.82 h,the microwave power was 570 W,and the mass ratio of biomass to sepiolite was 3.9:1.The maximum adsorption capacity of the optimized modified biochar for Pb(Ⅱ)reached 159.32 mg/g.The pyrolysis temperature,microwave power,and pyrolysis time had a linear effect on the adsorption performance of Pb(Ⅱ).There were interaction effects between the pyrolysis temperature and microwave power,as well as between the microwave power and pyrolysis time,on the adsorption performance of Pb(Ⅱ).The Langmuir adsorption isotherm and the pseudo-second-order kinetic model indicated that the adsorption of Pb(Ⅱ)on the sepiolite-modified biochar was mainly a chemical adsorption based on a monolayer,and its mechanisms included complexation,precipitation,cation-πinteraction,pore filling.The cyclic regeneration performance test showed that the sepiolite-modified biochar had stable and efficient Pb(Ⅱ)adsorption performance in 3 cycles.

关 键 词：生物炭 海泡石 铅污染 吸附 响应面法 

分 类 号：X52[环境科学与工程—环境工程] TQ424[化学工程]