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首页> 外文期刊>RSC Advances >A novel beta-FeOOH/NiO composite material as a potential catalyst for catalytic ozonation degradation of 4-chlorophenol
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A novel beta-FeOOH/NiO composite material as a potential catalyst for catalytic ozonation degradation of 4-chlorophenol

机译：新型的β-FeOOH/ NiO复合材料作为潜在的催化剂催化臭氧氧化降解4-氯苯酚

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In this study we report on the organic linker mediated fabrication and catalytic activity of a novel beta-FeOOH/NiO composite material for the first time. Four-chlorophenol (4-CP) was used as a target molecule to evaluate the catalytic activity of the composite material in ozonation reactions. Three different beta-FeOOH loadings, labelled 2, 5 and 10% beta-FeOOH/NiO composites were prepared. The 5% beta-FeOOH/NiO composite material showed the highest activity in the composite structure. XRD, FTIR and TEM were used to characterise the composite structure. Evidence of a chemically bonded interface between beta-FeOOH and NiO was apparent from the FTIR and TEM results. Adsorption of 4-CP on the catalyst surface was found to be negligible. First order reaction kinetics were used to describe the 4-CP degradation behaviour and the rate constants increased with increasing initial pH of the solution. No detectable amount of both Fe and Ni leaching into the solution was observed at a pH range of 10-2.3. After 20 min of the ozonation reaction, 85% of 4-CP was removed by the heterogeneous system as opposed to 47% by ozonation alone. The developed composite material exhibited good recyclability as the catalytic activity of the material could be recovered by calcination after use. A maximum of 66% of COD was removed just after 50 min of the catalytic ozonation reaction. The enhanced catalytic activity of the composite material was due to higher generation of OH center dot which was supported by photoluminescence (PL) experiments.
机译：在这项研究中，我们首次报道了有机连接剂介导的新型β-FeOOH/ NiO复合材料的制备和催化活性。使用四氯苯酚（4-CP）作为目标分子，以评估复合材料在臭氧化反应中的催化活性。制备了三种不同的β-FeOOH负载量，分别标记为2、5％和10％的β-FeOOH/ NiO复合材料。 5％β-FeOOH/ NiO复合材料在复合结构中显示出最高的活性。用XRD，FTIR和TEM表征了复合材料的结构。从FTIR和TEM结果可以明显看出β-FeOOH和NiO之间存在化学键合的界面。发现4-CP在催化剂表面上的吸附可忽略不计。一级反应动力学用于描述4-CP降解行为，速率常数随溶液初始pH值的增加而增加。在10-2.3的pH范围内，未观察到浸出到溶液中的Fe和Ni量。臭氧化反应20分钟后，异质系统去除了85％的4-CP，而仅臭氧化处理去除了47％的4-CP。所开发的复合材料表现出良好的可回收性，因为该材料的催化活性可以在使用后通过煅烧来恢复。催化臭氧氧化反应刚进行50分钟后，最多可去除66％的COD。复合材料增强的催化活性是由于更高的OH中心点的生成，这是由光致发光（PL）实验支持的。

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