Characteristics and mechanism of Ni^(2+)and Cd^(2+)adsorption by recovered perlite from agar extraction residue  

作　　者：Juan Wang Yanbing Zhu Zedong Jiang Xiping Du Mingjing Zheng Lijun Li Hui Ni Yuanpeng Wang Zhipeng Li Qingbiao Li 

机构地区：[1]College of Ocean Food and Biological Engineering,Jimei University,Xiamen 361021,China [2]Fujian Provincial Key Laboratory of Food Microbiology and Enzyme Engineering,Xiamen 361021,China [3]Research Center of Food Biotechnology of Xiamen City,Xiamen 361021,China [4]Xiamen Ocean Vocational College,Xiamen 361021,China [5]College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361021,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第8期141-152,共12页中国化学工程学报（英文版）

基　　金：financially supported by National Natural Science Foundation of China(22038012,32172339,and 22178142);National Key Research and Development Program(2023YF D2100603)。

摘　　要：Ni^(2+)and Cd^(2+)in wastewater accumulated through the ecological chain and could jeopardize human health.Adsorption of Ni^(2+)and Cd^(2+)from wastewater using recovered perlite was an important way to solve the problem of resource utilization of solid waste from agar production.Our previous study confirmed that recovered perlite from agar extraction residue had better pore size and specific surface area than commercial perlite.However,the adsorption efficiency and adsorption mechanism of recovered perlite were the main factors limiting its adsorption application.The adsorption process of Ni^(2+)and Cd^(2+)by recovered perlite in aqueous solution was described by the pseudo-second-order kinetic equation,and the relevant adsorption mechanism was mainly chemisorption.Compared with commercial perlite,the adsorption removal rate of Ni^(2+)and Cd^(2+)by enzymatic recovered perlite could reach 92.9%and 89.2%,respectively,and were improved by 12.63%and 13.03%.Langmuir isothermal adsorption model could better describe the isothermal adsorption process of recovered perlite on heavy metal Ni^(2+)and Cd^(2+),and the relevant adsorption mechanism was mainly monolayer adsorption.The X-ray photoelectron spectroscopy(XPS)results indicated that the decrease of Si—O Si^(2+)hydroxyl coordination bond and the increase of C—Si bond might make the binding effect of recovered perlite with heavy metals stronger.The competitive adsorption of Ni^(2+)and Cd^(2+)by recovered perlite was still dominated by chemisorption and monolayer adsorption.This study was expected to provide a theoretical basis and technical support for the removal of Ni^(2+)and Cd^(2+)from wastewater using recovered perlite from seaweed residue.

关 键 词：Agar extraction residue Recovered perlite Heavy metal ion Adsorption property 

分 类 号：O647.3[理学—物理化学] X703[理学—化学]