果胶@生物炭-Fe3O4的制备及其对Cu^2+的吸附性能  

Making of Pectin@Biochar Fe3O4 and Its Adsorption Property for Cu^2+

作　　者：郭丰艳 刘迎 金昌磊[1] GUO Feng-yan;LIU Ying;JIN Chang-lei(Department of Environmental and Chemical Engineering, Tangshan University, Tangshan 063000, China;School of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, China)

机构地区：[1]唐山学院环境与化学工程系,河北唐山063000 [2]石家庄学院化工学院,石家庄050035

出　　处：《唐山学院学报》2020年第6期24-30,共7页Journal of Tangshan University

基　　金：唐山市科技计划项目(17130253a);2020年河北省高等学校科学技术研究指导项目(Z2020130)。

摘　　要：以木屑为原料,高温热解制备生物炭。以聚乙烯醇为粘结剂,采用混合法将生物炭与果胶复合,并负载磁性,经烘干定型制备果胶包覆的磁性生物炭材料(果胶@生物炭-Fe3O4)。采用扫描电镜(SEM)、X射线衍射(XRD)及N2吸附-脱附(BET)等方法对果胶@生物炭-Fe3O4进行表征,结合吸附实验分析其对Cu^2+的吸附特性。结果表明,当生物炭、果胶、Fe3O4质量比为5∶1∶1,溶液pH值为6,吸附24 h,果胶@生物炭-Fe3O4对Cu^2+吸附效果最好;二级动力学方程能较好地描述果胶@生物炭-Fe3O4对Cu^2+的吸附过程,Freundlich模型能较好地拟合其吸附行为;SEM结果显示该材料具有不规则的孔隙结构;XRD分析显示纳米Fe3O4是其主要的晶体结构;BET测得其比表面积为25.654 m^2·g^-1,平均孔径为20.18 nm。Sawdust is used as a raw material to make biochar by pyrolysis.With polyvinyl alcohol as binder,biochar and pectin are compounded by mixing method.After magnetizing and drying treatment,the magnetic biochar covered by pectin(Pectin@Biochar Fe3O4)is obtained.Then it is characterized by using scanning electron microscopy(SEM),X-ray diffraction(XRD)and N2 adsorption-desorption(BET).The adsorption property for Cu^2+is analyzed based on the adsorption experiment.The results show that:The adsorption effect of Pectin@Biochar Fe3O4 can reach its best with the mass ratio of biochar,pectin and Fe3O4 being 5∶1∶1,pH being 6,and adsorption time being 24 hours;The adsorption process can be well described by second-order kinetic equation and the adsorption behavior can be well fitted by Freundlich model;SEM results show that Pectin@Biochar Fe3O4 has irregular pore structures,and XRD analysis reveals that nano Fe3O4 is the main crystal structure;Its specific surface area is 25.654 m^2·g^-1and the average pore diameter is 20.18 nm by BET test.

关 键 词：果胶 生物炭 FE3O4 CU^2+ 吸附性能 

分 类 号：X703[环境科学与工程—环境工程] O647.3[理学—物理化学]