氧化石墨烯负载磁性纳米复合材料(Fe3 O4/rGO):氧化降解三氯乙烯的有效来源  

Graphene oxide supported magnetic nanocomposite(Fe3O4/rGO):an effective source for oxidative degradation of trichloroethylene

作　　者：乌斯曼 庄景果 王霏 陈玖妍 王新海[1] FAROOQ Usman;ZHUANG Jingguo;WANG Fei;CHEN Jiuyan;WANG Xinhai(School of Chemistry and Chemical Engineering,Henan University,Kaifeng 475004,Henan,China)

机构地区：[1]河南大学化学化工学院,河南开封475004

出　　处：《化学研究》2020年第6期518-524,共7页Chemical Research

基　　金：Science and Technology Major Project of Henan Province(CX0001F01800);Henan University Post-doc-toral Start Up Research Funds(CJ3050A0670001).

摘　　要：合成了固定在还原氧化石墨烯(rGO)上的纳米磁铁矿(Fe3O4)纳米颗粒,用于活化过氧单硫酸酯(PMS)以促进三氯乙烯(TCE)降解.通过扫描电子显微镜(SEM)、透射电子显微镜(TEM)、布伦诺-埃米特-特勒(BET)表面表征、X射线衍射(XRD)等多种分析技术对合成的Fe3O4/还原氧化石墨烯(rGO)纳米复合材料进行表征.这些技术证实了还原氧化石墨烯负载球形Fe3O4的成功制备,其表面积和粒径分别为176.32 m^2/g和80~120 nm.氧化石墨烯载体阻止了Fe3O4纳米粒子的团聚和聚集.并通过Fe3O4/rGO和PMS剂量实验优化降解性能.结果表明,0.15g/L Fe3 O4/rGO和1.5mmol/L PMS足以充分降解TCE.此外,矿化(85%)和脱氯(89.3%)验证了过程中无毒中间体和最终产物的形成.活性位点的腐蚀和损失降低了催化剂的可回收性和稳定性,在第4次循环后观察到约18%的TCE降解.Fe3O4/还原氧化石墨烯活化PMS可作为地下水中TCE的另一种修复技术.Nano magnetite(Fe3O4)nanoparticles immobilized on reduced graphene oxide(rGO)were synthesized for the activation of peroxymonosulfate(PMS)for trichloroethylene(TCE)degradation.Various analytic techniques such as scanning electron microscope(SEM),transmission electron microscope(TEM),Brunauer-Emmett-Teller(BET)surface characterization,and X-ray diffraction(XRD)have been applied for the characterization of synthesized Fe3O4/rGO nanocomposite.These techniques confirmed the successful preparation of spherical shaped Fe3O4 supported on rGO having a surface area and particle size of 176.32 m^2/g and 80-120 nm respectively.The GO support prevented the agglomeration and aggregation of Fe3O4 nanoparticles.Furthermore,the effect of Fe3O4/rGO and PMS dosages experiments were conducted to optimize the degradation performance.The results evaluated that 0.15 g/L Fe3O4/rGO and 1.5 mmol/L PMS are enough for almost complete degradation of TCE.Additionally,the mineralization(85%)and dechlorination(89.3%)validated the nontoxic intermediate and final product formation during process.The corrosion and loss of active sites reduced the recyclability and stability capacity of catalyst and about 18%TCE degradation observed after 4^th cycle.The Fe3O4/rGO activated PMS could be an alternative technique for the remediation of TCE in groundwater.

关 键 词：非均相催化剂 FE3O4 过硫酸盐 三氯乙烯 预氧化过程 

分 类 号：O614[理学—无机化学]