Preparation and characterization of a copper phosphotungstate/titanium dioxide (Cu-H3PW12O40/TiO2) composite and the photocatalytic oxidation of high-concentration ammonia nitrogen.
Preparation and characterization of a copper phosphotungstate/titanium dioxide (Cu-H3PW12O40/TiO2) composite and the photocatalytic oxidation of high-concentration ammonia nitrogen.
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DOI：
10.1016/j.scitotenv.2020.138425
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发表时间：
2020-04
期刊：
影响因子：
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通讯作者：
F. Yao;Weizhang Fu;Xiaohong Ge;Lingshen Wang;Jin-hua Wang;Wanzhen Zhong
中科院分区：
文献类型：
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作者：
F. Yao;Weizhang Fu;Xiaohong Ge;Lingshen Wang;Jin-hua Wang;Wanzhen Zhong
目前，高浓度氨氮（NH4+/NH3）废水大多采用生物法处理，生物降解性差，去除效率低。 【摘要】：采用溶胶-凝胶水热合成法制备了磷钨酸铜/二氧化钛复合光催化剂(Cu-H3PW12O40/TiO2),并通过X射线衍射(XRD)、紫外可见漫反射光谱(UV-VIS-DRS)、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和能谱等手段对复合催化剂进行了表征。色散 X 射线光谱 (EDS)。在紫外（UV）光下对高浓度NH4+/NH3溶液进行光催化氧化，探讨不同影响因素对光催化效果的影响并优化反应条件。所制备的复合催化剂表现出比TiO2更高的光催化活性。当溶液初始浓度为300 mg·L−1、初始pH为11、催化剂浓度为1.5 g·L−1、Cu-H3PW12O40负载量为40%、通气量为1.5 L·min−1时，复合光催化剂对NH4+/NH3的去除率可达到>80%。产生的NO2−和NO3−非常少，N2是主要产物。
Currently, the majority of wastewater with a high concentration of ammonia nitrogen (NH4+/NH3) is treated using biological methods, which have poor biodegradability and low removal efficiency. In this paper, a composite photocatalyst of copper phosphotungstate/titanium dioxide (Cu-H3PW12O40/TiO2) was prepared by sol-gel hydrothermal synthesis, and the composite catalyst was characterized by X-ray diffraction (XRD), UV–vis-diffuse reflectance spectroscopy (UV-VIS-DRS), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS),scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The photocatalytic oxidation of a high-concentration NH4+/NH3solution was carried out under ultraviolet (UV) light to explore the effects of different influencing factors on the photocatalytic effect and to optimize the reaction conditions. The prepared composite catalyst exhibited higher photocatalytic activity than that of TiO2. When the initial concentration of the solution was 300 mg·L−1, the initial pH was 11, the catalyst concentration was 1.5 g·L−1, the loading level of Cu-H3PW12O40was 40%, and the aeration rate was 1.5 L·min−1, the removal rate of NH4+/NH3by the composite photocatalyst could reach >80%. Very little NO2−and NO3−were produced, and N2was the main product.