Fe_(3)O_(4)@SiO_(2)/PEI修饰氧化石墨烯对水中染料的吸附研究  

Study on the Adsorption of Dyes in Water by Fe_(3)O_(4)@SiO_(2)/PEI Modified Graphene Oxide

作　　者：黄斌艳 李斌 Huang Binyan;Li Bin(The College of Life Sciences of Hengyang Normal University,Hengyang 421008,China;The Changsha Ecological Environment Agency,Changsha 410013,China)

机构地区：[1]衡阳师范学院生命科学学院,湖南衡阳421008 [2]长沙市生态环境局,湖南长沙410013

出　　处：《广东化工》2024年第21期28-31,共4页Guangdong Chemical Industry

基　　金：湖南省教育厅优秀青年项目(21B0628)。

摘　　要：本研究利用Fe_(3)O_(4)@SiO_(2)/PEI修饰的氧化石墨烯磁性复合材料(MSPG)去除水中含阴、阳离子染料废水。其中,MO在pH为4.0时吸附量达最大值233.5 mg/g,CR在pH为6.0时吸附量达最大值213.5 mg/g,而MB在pH为10.0时吸附量达最大值99.89 mg/g。MSPG对CR和MB的吸附过程更符合Freundlich吸附模型,MSPG对MO的吸附更符合Langmuir吸附模型。同时,MSPG对MO、CR和MB焓变ΔH°值均为正值,吉布斯自由能ΔG°均为负值,说明吸附过程均为吸热和自发的过程。与Fe_(3)O_(4)@SiO_(2)/PEI相比,MSPG不仅对阴离子染料MO和CR有较高的吸附,而且对MB也有一定的吸附,表明GO的加入,使MSPG去除CR和MB的能力显著增强,并且具有更加广泛的实用性。In this study,Fe_(3)O_(4)@SiO_(2)/PEI modified graphene oxide magnetic composite material(MSPG) was utilized to remove anionic and cationic dyes from aqueous solutions.The maximum adsorption capacities for Methyl Orange(MO),Congo Red(CR),and Methylene Blue(MB) were found to be 233.5 mg/g at pH4.0,213.5 mg/g at pH 6.0,and 99.89 mg/g at p H 10.0,respectively.The adsorption processes of CR and MB by MSPG were more consistent with the Freundlich isotherm model,whereas the adsorption of MO by MSPG followed the Langmuir isotherm model.Furthermore,the enthalpy change(ΔH°) values for the adsorption of MO,CR,and MB by MSPG were positive,while the Gibbs free energy change(ΔG°) values were negative,indicating that the adsorption processes were endothermic and spontaneous.Compared to Fe_(3)O_(4)@SiO_(2)/PEI,MSPG not only exhibited higher adsorption capacities for the anionic dyes MO and CR but also showed significant adsorption for the cationic dye MB.This demonstrates that the incorporation of graphene oxide(GO) significantly enhances the ability of MSPG to remove CR and MB,indicating its broader applicability in practical applications.

关 键 词：磁性复合材料 氧化石墨烯 染料 吸附去除 

分 类 号：TQ[化学工程]