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首页> 外文期刊>RSC Advances >Electrocatalytic reduction of trace nitrobenzene using a graphene-oxide@polymerized-manganese-porphyrin composite
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Electrocatalytic reduction of trace nitrobenzene using a graphene-oxide@polymerized-manganese-porphyrin composite

机译：氧化石墨烯@聚合-锰-卟啉复合材料电催化还原痕量硝基苯

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A core–shell structure electrocatalyst for trace nitrobenzene reduction was prepared with Mn( II )[5,10,15,20-tetra(4-aminophenyl)porphyrin] (MnTAPP) and graphene oxide (GO) as raw materials. Firstly, MnTAPP and GO were combined together by covalent bonds, and then the supported MnTAPP was coupled together through p -dibromobenzene, a conjugated bridging agent, to obtain a more stable graphene-oxide@polymerized-manganese-porphyrin composite (GMPP@AMP). The structure and morphology of the GMPP@AMP were characterized by FT-IR, Raman spectroscopy, SEM and TEM. The GMPP@AMP modified glassy carbon electrode (GMPP@AMP/GCE) was prepared and the electrochemical activity of GMPP@AMP towards nitrobenzene reduction was evaluated by cyclic voltammetry (CV). The results showed that GMPP@AMP/GCE had a more positive reduction potential than MnTAPP/GCE and GO/GCE, and the reduction current responded more sensitively. Electrocatalytic reduction currents of nitrobenzene were found to be linearly related to concentration over the range 0.04 to 0.24 mM using a differential pulse voltammogram (DPV) method. Nitrobenzene is easily compatible with polymerized MnTAPP which has rich nitrogen-containing functional groups and porous structure, and the highly conductive GO combined with the polymerized MnTAPP having excellent electron transfer ability. This produced a significant synergistic catalytic effect during the electrocatalytic reaction of trace nitrobenzene. The novel composite has good application prospects in electrochemical detection of trace nitrobenzene compounds in the environment.
机译：以Mn（II）[5,10,15,20-四（4-氨基苯基）卟啉]（MnTAPP）和氧化石墨烯（GO）为原料，制备了用于痕量硝基苯还原的核-壳结构电催化剂。首先，MnTAPP和GO通过共价键结合在一起，然后负载的MnTAPP通过共轭桥联剂对二溴苯偶联在一起，从而获得更稳定的石墨烯-氧化物@聚合-锰-卟啉复合材料（GMPP @ AMP） 。利用FT-IR，拉曼光谱，SEM和TEM对GMPP @ AMP的结构和形貌进行了表征。制备了GMPP @ AMP修饰的玻碳电极（GMPP @ AMP / GCE），并通过循环伏安法（CV）评价了GMPP @ AMP对硝基苯还原的电化学活性。结果表明，与MnTAPP / GCE和GO / GCE相比，GMPP @ AMP / GCE的还原电位更高，还原电流的响应更为灵敏。使用微分脉冲伏安法（DPV）方法，发现硝基苯的电催化还原电流与0.04至0.24 mM范围内的浓度呈线性关系。硝基苯易于与具有丰富的含氮官能团和多孔结构的聚合MnTAPP相容，并且与聚合MnTAPP结合的高导电性GO具有出色的电子转移能力。在痕量硝基苯的电催化反应中产生了明显的协同催化作用。该新型复合材料在环境中痕量硝基苯化合物的电化学检测中具有良好的应用前景。

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