Hierarchical honeycomb-like Pt/NiFe-LDH/rGO nanocomposite with excellent formaldehyde decomposition activity
Hierarchical honeycomb-like Pt/NiFe-LDH/rGO nanocomposite with excellent formaldehyde decomposition activity
复制标题
具有优异甲醛分解活性的多级蜂窝状 Pt/NiFe-LDH/rGO 纳米复合材料
DOI：
10.1016/j.cej.2019.01.187
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发表时间：
2019
影响因子：
15.1
通讯作者：
Yu Jiaguo
中科院分区：
文献类型：
--
作者：
Wang Yuanyuan;Jiang Chuanjia;Le Yao;Cheng Bei;Yu Jiaguo
甲醛（HCHO）被认为是最普遍的室内污染物，其对人类造成严重的健康症状。室温催化氧化法是室内甲醛去除最有前途的技术。本文采用水热法制备了还原氧化石墨烯（rGO）和镍铁层状双氢氧化物（NiFe-LDH）的分级蜂窝状纳米复合材料。用0.34wt%的Pt修饰NiFe-LDH/rGO后，Pt/NiFe-LDH/rGO在室温下表现出优异的催化性能，这主要是由于NiFe-LDH和rGO在复合材料中的分散性较好。这一结构特征赋予Pt/NiFe-LDH/rGO更大的比表面积，从而产生丰富的表面活性位和高度分散的Pt纳米颗粒，有利于NiFe-LDH表面氧原子和吸附氧分子的活化。甲醛和甲酸酯是主要的反应中间体，而表面羟基和表面活性氧原子是参与催化反应的关键物种，这揭示了甲醛的氧化机理.这项工作表明，将石墨烯材料引入分级催化剂可以增强气态HCHO和潜在的其他室内污染物的去除。
Formaldehyde (HCHO) is regarded as the most ubiquitous indoor pollutant, which causes severe health symptoms for humans. Catalytic oxidation at ambient temperature has been identified as the most promising technique for indoor HCHO removal. Herein, a hierarchical honeycomb-like nanocomposite of reduced graphene oxide (rGO) and nickel-iron layered double hydroxide (NiFe-LDH) was prepared via a hydrothermal method. After decoration of the NiFe-LDH/rGO with 0.34 wt% of platinum (Pt), the Pt/NiFe-LDH/rGO showed excellent catalytic performance for HCHO degradation at room temperature, which are due basically to the better dispersion of both NiFe-LDH and rGO in the composite. This structural characteristic endows Pt/NiFe-LDH/rGO with larger surface area, thus resulting in plentiful surface active sites and highly dispersed Pt nanoparticles, which are conducive to the activation of both surface oxygen atoms of NiFe-LDH and adsorbed oxygen molecules. Moreover, dioxymethylene and formate were major reaction intermediates, while surface hydroxyl groups and surface active oxygen atoms were the key species involved in the catalytic reaction, which shed light on the HCHO oxidation mechanism. This work demonstrates that introducing graphene materials into hierarchical catalysts can enhance the removal of gaseous HCHO and potentially other indoor pollutants.