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首页> 外文期刊>Chemosphere >Sewage sludge-derived TiO_2/Fe/Fe_3C-biochar composite as an efficient heterogeneous catalyst for degradation of methylene blue
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Sewage sludge-derived TiO_2/Fe/Fe_3C-biochar composite as an efficient heterogeneous catalyst for degradation of methylene blue

机译：污水污泥衍生的TiO_2 / Fe / Fe_3C-生物炭复合材料作为降解亚甲基蓝的高效多相催化剂

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Novel TiO2/Fe/Fe3C-biochar composite, as a heterogeneous catalyst, has been synthesized by a single-step route, where sewage sludge (SS) and different ratios of nanoparticles (NPs: Fe and Ti) impregnated with chitosan using coagulation and flocculation techniques for subsequent thermal decomposition at 800 degrees C. The physiochemical properties of samples have been characterized thoroughly and employed in methylene blue (MB) degradation tests. It was found that NPs ratio and chitosan support have significant influences on the properties and catalytic activity of catalysts. Chitosan inclusion successfully improves the surface area and mesoporosity of composites, while high contents of Fe integration reduce surface area and active site (Fe3C) due to Fe-0 agglomeration. Though, Ti incorporation produces Ti3+ that activated photosensitivity. Catalyst with the high mesoporous surface, Ti3+ , selective Fe3C, and small Fe-0 shows superior MB removal competency through concurrent adsorption, photodegradation, and H2O2 activation. Primarily center dot OH and some O-2(center dot-) radicles participating in the degradation reactions evident from scavenging experiments. The maximum MB removal capacity evaluated as 376.9 mg L-1 in neutral pH. Moreover, the catalyst exhibits excellent material stability, recyclability, easy separability, and low Fe-ion leaching (0.11 mg L-1 ) after catalysis. This study provided new insight into a low-cost and environmentally friendly route of catalyst synthesis using SS, NPs, and chitosan, which concurrently advantageous to SS disposal and wastewater treatment. (C) 2018 Elsevier Ltd. All rights reserved.
机译：通过一步法合成了新型TiO2 / Fe / Fe3C-生物炭复合材料作为非均相催化剂，该工艺通过混凝和絮凝法将污水污泥（SS）和不同比例的纳米粒（NPs：Fe和Ti）浸入壳聚糖中技术用于随后在800摄氏度下进行热分解。样品的理化特性已得到充分表征，并已用于亚甲基蓝（MB）降解测试。发现NPs比率和壳聚糖载体对催化剂的性质和催化活性具有显着影响。壳聚糖夹杂物成功地改善了复合材料的表面积和介孔性，而由于Fe-0的团聚，高含量的Fe结合物减少了表面积和活性位点（Fe3C）。但是，掺入Ti会产生激活光敏性的Ti3 +。具有高介孔表面，Ti3 +，选择性Fe3C和小Fe-0的催化剂通过同时吸附，光降解和H2O2活化显示出优异的MB去除能力。从清除实验来看，主要是中心点OH和一些O-2（中心点）基团参与了降解反应。在中性pH下，最大的MB去除能力为376.9 mg L-1。而且，该催化剂在催化后表现出优异的材料稳定性，可回收性，易于分离和低Fe离子浸出（0.11mg L-1）。这项研究为使用SS，NP和壳聚糖的低成本，环保的催化剂合成途径提供了新的见识，同时有利于SS处理和废水处理。 （C）2018 Elsevier Ltd.保留所有权利。

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