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首页> 外文期刊>RSC Advances >Solar photocatalytic ozonation of emerging contaminants detected in municipal wastewater treatment plant effluents by magnetic MWCNTs/TiO2 nanocomposites
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Solar photocatalytic ozonation of emerging contaminants detected in municipal wastewater treatment plant effluents by magnetic MWCNTs/TiO2 nanocomposites

机译：磁性MWCNTs / TiO2纳米复合材料在城市污水处理厂废水中检测到的新兴污染物的光催化臭氧氧化作用

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摘要

Magnetically separable catalysts with high solar photocatalytic ozonation activity were successfully synthesized. First maghemite and then titania (anatase) nanoparticles were deposited onto the multiwalled carbon nanotubes (MWCNTs) by co-precipitation and sol-gel methods. The synthesized catalysts were characterized by XRD, N-2 adsorption/desorption, TEM, XPS and VSM, and were applied for the removal of emerging contaminants (ECs) existing in urban wastewater through photocatalytic ozonation. Ozone alone can completely remove a mixture of the four ECs in water, but the mineralization degree was very low (44.9%). Photocatalytic oxidation led to a higher level of mineralization (48.3% TOC removal) in the experimental conditions, but some intermediate products such as phenolic compounds and carboxylates which are toxic and difficult to degrade were generated during the photocatalytic oxidation process. Photocatalytic ozonation led to the highest removal efficiency for TOC (65.7%), which suggested a lower concentration of intermediate products accumulated during photocatalytic ozonation, the integration of ozonation and solar photocatalytic oxidation improved the mineralization efficiency.
机译：成功合成了具有高光催化臭氧活性的可磁分离催化剂。首先通过共沉淀和溶胶-凝胶法将磁赤铁矿，然后是二氧化钛（锐钛矿）纳米颗粒沉积到多壁碳纳米管（MWCNT）上。利用XRD，N-2吸附/解吸，TEM，XPS和VSM对合成的催化剂进行了表征，并通过光催化臭氧化法去除了城市废水中的新兴污染物（ECs）。单独使用臭氧可以完全去除水中四种EC的混合物，但矿化度非常低（44.9％）。在实验条件下，光催化氧化导致较高的矿化水平（TOC去除率为48.3％），但是在光催化氧化过程中会生成一些有毒且难以降解的中间产物，例如酚类化合物和羧酸盐。光催化臭氧化导致TOC的去除效率最高（65.7％），这表明在光催化臭氧化过程中积累的中间产物浓度较低，臭氧化和太阳光催化氧化的整合提高了矿化效率。

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