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首页> 外文期刊>Journal of Environmental Science and Health >Photodecolorisation of melanoidins in vinasse with illuminated TiO2-ZnO/activated carbon composite
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Photodecolorisation of melanoidins in vinasse with illuminated TiO2-ZnO/activated carbon composite

机译：TiO2-ZnO /活性炭复合材料对酒糟中黑色素的光致脱色

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A hybrid photo-catalyst, TiO2-ZnO, was synthesized by immobilizing ZnO on commercial TiO2 (aeroxide P25). Activated carbon (AC) was subsequently used to support the hybrid, thus forming a TiO2-ZnO/AC composite catalyst. Fourier transform infrared (FTIR) analysis and scanning electron microscopy integrated with energy-dispersive X-ray spectroscopy (SEM-EDX) investigations revealed successful catalyst synthesis. Optical properties of the hybrid determined from photoluminescence (PL) and Ultraviolet-visible (UV-vis) spectroscopy confirmed a restrained recombination of electron-hole pairs and reduced energy band gap due to a successful heterojunction formation. The prepared catalysts were used to photodecolorise vinasse in a 12-W UVC batch photoreactor. TiO2-ZnO had improved photocatalytic activity compared with TiO2 and ZnO separately. On supporting the hybrid onto AC, both adsorption and photocatalytic activities were further enhanced with improved overall color removal of 86% from 68%. Photodecolorisation followed the pseudo-first-order reaction model with the rate constant observed decreasing from 0.0701 to 0.0436min(-1) on increasing the initial concentration from 5,000 to 14,000ppm. The UV process was found to be 33-fold less energy intensive for color reduction as compared to total organic carbon (TOC) reduction. Formation of nitrates during the photodecolorisation process was attributed to the mineralization of nitrogen heteroatoms in the color-causing melanoidin compounds.
机译：通过将ZnO固定在商用TiO2（aeroxide P25）上合成了一种杂化光催化剂TiO2-ZnO。随后使用活性炭（AC）来支撑杂化物，从而形成TiO2-ZnO / AC复合催化剂。傅里叶变换红外（FTIR）分析和扫描电子显微镜与能量色散X射线光谱法（SEM-EDX）的研究相结合，揭示了成功的催化剂合成方法。由光致发光（PL）和紫外可见（UV-vis）光谱确定的杂化体的光学性质证实，由于成功形成异质结，电子-空穴对的重组受到抑制，并且能带隙减小。制备的催化剂用于在12 W UVC批处理光反应器中对酒糟进行光致脱色。 TiO2-ZnO分别比TiO2和ZnO具有更好的光催化活性。在将杂化物支持到AC上后，其吸附和光催化活性都得到了进一步提高，总脱色率从68％提高到86％。光致脱色遵循伪一级反应模型，初始浓度从5,000ppm增加到14,000ppm时，观察到的速率常数从0.0701降低到0.0436min（-1）。与减少总有机碳（TOC）相比，发现UV处理的颜色减少的能源强度降低了33倍。在光脱色过程中硝酸盐的形成归因于导致变色的类黑素化合物中氮杂原子的矿化。

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