Efficient transformation in characteristics of cations supported-reduced graphene oxide nanocomposites for the destruction of trichloroethane
Efficient transformation in characteristics of cations supported-reduced graphene oxide nanocomposites for the destruction of trichloroethane
复制标题
阳离子负载还原氧化石墨烯纳米复合材料特性的有效转化，用于破坏三氯乙烷
DOI：
10.1016/j.apcata.2017.07.007
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发表时间：
2017-08-25
影响因子：
5.5
通讯作者：
Qiu, Zhaofu
中科院分区：
文献类型：
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作者：
Farooq, Usman;Danish, Muhammad;Qiu, Zhaofu
实验研究了氧化石墨烯负载金属纳米复合材料对过碳酸钠(SPC)降解三氯乙烷(TCA)的影响。采用化学还原(CR)和溶剂热(ST)两种制备方法制备了还原氧化石墨烯(RGO)负载的单一(Fe)和二元(Fe-Cu)纳米复合材料。采用氮气吸附Brunauer-Emmett-Teller(BET)、X射线衍射仪(XRD)、傅立叶变换红外光谱(FTIR)和透射电子显微镜(TEM)等分析手段对所合成的纳米复合材料的物化性能和微观结构进行了表征。表征结果表明，CR法制备的纳米复合材料只具有介孔结构。相反，用ST法制备的样品既有微孔结构，也有介孔结构。ST法合成的单金属和双金属复合材料的比表面积分别为93.6m(2)/g和119.2 m(2)/g，而CR法合成的单金属和双金属复合材料的比表面积分别为13.8m(2)/g和38.0m(2)/g。傅立叶变换红外光谱和X射线衍射仪的分析结果证实了ST法制备的纳米复合材料具有较高的结晶度。扫描电子显微镜和透射电子显微镜分析表明，金属颗粒在rGO表面均匀分布，具有一定的形貌。X射线光电子能谱(XPS)分析证实了纳米复合材料的均匀性和降解过程中铜的氧化状态发生了变化。EDS图谱验证了铜和铁在氧化石墨烯还原表面的均匀分布。与Fe-Cu/rGO(CR)和单独Fe相比，Fe-Cu/rGO(St)活化的SPC体系在2.5h内有效地降解了TCA(92%)，最大降解率分别为81%和34%。综上所述，ST合成的单金属和双金属(Fe/rGO，Fe-Cu/rGO)催化剂具有良好的催化性能。这些催化剂通过活化的SPC成功地促进了TCA的降解。
Experiments were conducted to investigate the use of graphene-oxide supported metallic nanocomposites for improving the degradation of trichloroethane (TCA) by sodium percarbonate (SPC). Two methods of production, chemical reduction (CR) and solvo-thermal (ST), were tested for preparation of single (Fe) and binary (Fe-Cu) nanocomposites supported by reduced graphene oxide (rGO). A variety of analytical techniques including N-2 adsorption Brunauer-Emmett-Teller (BET), x-ray diffraction (XRD), fourier-transfrom infrared spectroscopy (FTIR), and transmisison electron microscopy (TEM) were applied to characterize the physicochemical and microstructural properties of the synthesized nanocomposites. The characterization indicated that the CR method produced nanocomposites that comprised only mesoporous structure. Conversely, both micro and mesoporous structures were present for samples produced with the ST method. The synthesized single and bimetallic composites produced from the ST method showed higher surface areas, i.e. 93.6 m(2)/g and 119.2 m(2)/g as compared to the ones synthesized via the CR method, i.e. 13.8 m(2)/g and 38.0 m(2)/g respectively. The results of FTIR and XRD analyses confirmed that the ST method produced highly crystalline nanocomposites. SEM and TEM analysis validated that metallic particles with definite morphology well distributed on the surface of rGO. X-ray photoelectron spectroscopy (XPS) analysis confirmed the homogeneity nanocomposites and occurrence of variation in copper oxidation states during degradation process. EDS mapping validate the homogeneous distribution of Cu and Fe at reduced graphene oxide surface. The Fe-Cu/rGO (ST) activated SPC system effectively degraded TCA (92%) in 2.5 h at low nanocomposite dose compared to the Fe-Cu/rGO (CR) and only Fe, for which the maximum degradation efficiencies achieved were 81% and 34%. In conclusion, excellent catalytic characteristics were observed for the ST-synthesized single and bimetallic (Fe/rGO, Fe-Cu/rGO) catalysts. These catalysts were successful in improving the degradation of TCA via activated SPC.