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首页> 外文期刊>Journal of Environmental Science and Health >Reversible photochromic photocatalyst Bi_2O_3/TiO_2/Al_2O_3 with enhanced visible photoactivity: application toward UDMH degradation in wastewater
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Reversible photochromic photocatalyst Bi_2O_3/TiO_2/Al_2O_3 with enhanced visible photoactivity: application toward UDMH degradation in wastewater

机译：可见光活性增强的可逆光致变色光催化剂Bi_2O_3 / TiO_2 / Al_2O_3：在废水中UDMH降解中的应用

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1,1-Dimethylhydrazine (UDMH) and its by-products were considered carcinogenic toxins and represent a serious health hazard to the population once present in water under natural conditions without treatment. The conventional degradation method suffers from incomplete removal of intermediate products (especially N-nitrosodimethylamine (NDMA)), the powdery catalysis being difficult to recover and results in high energy consumption. In this study, a series of Bi2O3/TiO2/Al2O3 (BTA) photocatalysts have been successfully synthesized by a simple dry mixing method with powder material followed by their immobilization. It was evaluated by the photocatalytic degradation of UDMH present in wastewater, which can be recovered by rapid filtration and utilizes only solar energy. The catalyst exhibited markedly enhanced photocatalytic activity for the degradation of UDMH wastewater compared with conventional TiO2/Al2O3 (TA) catalysts under UV, visible and solar irradiation. Besides, the intermediate NDMA was gradually completely degraded. The photocatalysts were extensively characterized using scanning electron microscopy, energy dispersive spectrometry, specific surface area (BET), X-ray diffraction, X-ray photoelectron spectroscopy, UV-visible diffuse reflectance spectroscopy and photo-electrochemical I-t curves evaluation. The results revealed that all the BTA composites exhibited high stability and stronger absorbance in visible light. In addition, the BTA exhibited a reversible photochromic property that can effectively expand the range of light absorption and enhance the photocatalytic activity. The reversible photochromic properties of BTA explained in the proposed mechanism model are expected to be useful for detecting and sensing UDMH or other organic contaminants.
机译：1,1-二甲基肼（UDMH）及其副产物被认为是致癌毒素，一旦在自然条件下未经处理就存在于水中，会对人们构成严重的健康危害。常规的降解方法遭受中间产物（特别是N-亚硝基二甲胺（NDMA））的不完全去除的困扰，粉末状的催化剂难以回收并且导致高能耗。在这项研究中，通过简单的粉末材料干混法并固定化，成功地合成了一系列Bi2O3 / TiO2 / Al2O3（BTA）光催化剂。通过废水中存在的UDMH的光催化降解进行了评估，该废水可以通过快速过滤回收并且仅利用太阳能。与传统的TiO2 / Al2O3（TA）催化剂相比，在紫外，可见光和太阳光照射下，该催化剂对UDMH废水的降解具有显着增强的光催化活性。此外，中间的NDMA逐渐完全降解。使用扫描电子显微镜，能量分散光谱，比表面积（BET），X射线衍射，X射线光电子能谱，紫外可见漫反射光谱和光电化学I-t曲线评估对光催化剂进行了广泛表征。结果表明，所有BTA复合材料在可见光下均表现出高稳定性和更强的吸收性。另外，BTA显示出可逆的光致变色性质，其可以有效地扩大光吸收的范围并增强光催化活性。预期在所提出的机理模型中解释的BTA的可逆光致变色特性可用于检测和感测UDMH或其他有机污染物。

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