不同热解温度生物炭对Cd^(2+)的吸附影响  

Effect of biochar at different pyrolysis temperatures on the adsorption of Cd^(2+)

作　　者：康彩艳[1,2] 李秋燕 刘金玉 张舒云 胡乐宁 邓华[1,2] Kang Caiyan;Li Qiuyan;Liu Jinyu;Zhang Shuyun;Hu Lening;Deng Hua(Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection,Guangxi Normal University,Guilin 541004,China;College of Environment and Resources,Guangxi Normal University,Guilin 541004,China)

机构地区：[1]广西师范大学珍稀濒危动植物生态与环境保护教育部重点实验室,广西桂林541004 [2]广西师范大学环境与资源学院,广西桂林541004

出　　处：《工业水处理》2021年第5期68-72,79,共6页Industrial Water Treatment

基　　金：国家自然科学基金项目(41301343)。

摘　　要：分别以香蕉秸秆(BS)、木薯秸秆(CS)为原料,采用限氧热解法在不同热解温度下制备生物炭,采用元素分析、Boehm滴定、BET、FTIR、XRD等方法分析了生物炭的基本特性,研究了生物炭对Cd2+的吸附特性和作用机制。结果表明,热解温度能显著影响生物炭的产率、灰分、pH、孔径结构以及元素分布等性质;生物炭吸附过程符合准二级动力学;生物炭对Cd^(2+)的吸附作用机制主要表现为络合作用和沉淀作用,K^(+)、Na^(+)、Mg^(2+)、Ca^(2+)共存会影响Cd2+的吸附,且热解温度越低,影响作用越大。The biochars with different pyrolysis temperatures were prepared by oxygen-limited pyrolysis method,using banana straw(BS)and cassava straw(CS)as raw materials respectively.The basic characteristics of biochar were analyzed by elemental analysis,Boehm titration,BET,FTIR,XRD and et al.,and the adsorption characteristics and mechanism of biochar for Cd^(2+)were studied.The results showed that the pyrolysis temperature could affect the yield,ash content,pH,pore structure and element distribution of the biochar significantly.The adsorption process conformed to quasi-second-order kinetics.The adsorption mechanism of Cd^(2+)by biochar was mainly complexation and precipitation.The coexistence of K^(+),Na^(+),Mg^(2+)and Ca^(2+)could affect the adsorption of Cd^(2+),and the lower the pyrolysis temperature was,the greater it influenced.

关 键 词：生物炭 吸附 镉 

分 类 号：X703.1[环境科学与工程—环境工程]