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首页> 外文期刊>Journal of Hazardous Materials >A simple method to prepare g-C_3N_4-TiO_2/waste zeolites as visible-light-responsive photocatalytic coatings for degradation of indoor formaldehyde
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A simple method to prepare g-C_3N_4-TiO_2/waste zeolites as visible-light-responsive photocatalytic coatings for degradation of indoor formaldehyde

机译：一种简单的方法制备g-C_3N_4-TiO_2 /废沸石作为可见光响应型光催化涂料，用于降解室内甲醛

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The indoor air quality should be highly addressed because people spend more time staying in indoor environments. Photocatalytic degradation of indoor pollutants (e.g., formaldehyde) is one of the most promising and environmental friendly technologies. In this work, a heterostructured photocatalyst combining graphitic carbon nitride (g-C3N4), TiO2 and waste zeolites (g-C3N4-TiO2/waste zeolites) is developed by a facile calcination and sol-gel method. The prepared photocatalysts exhibit the superior visible-light-responsive activities toward formaldehyde degradation (k = 0.0127 min(-1)) which is higher than g-C3N4-TiO2 (k = 0.0123 min(-1)) and P25 (k = 0.0056 min(-1)). Over 90% of low-concentration formaldehyde can be oxidized by g-C3N4-TiO2/waste zeolites under a commercial LED light within 300 min. The electron spin resonance spectra indicate that the superoxide radical anions (O-center dot(2)-) photogenerated on the g-C3N4-TiO2/waste zeolites under visible light irradiation are responsible for the decomposition of formaldehyde. The enhancement in the photocatalytic decomposition of formaldehyde in the air is possibly due to the heterojunction between g-C3N4 (the enhanced absorption of visible light) and TiO2 (fast transfer of photogenerated electrons from g-C3N4) as well as assisted adsorption of gas-phase formaldehyde via waste zeolites. This work also exemplifies the valorization of industrial silicate wastes to efficient photocatalytic coatings for indoor air purification.
机译：室内空气质量应得到高度重视，因为人们将更多时间花在室内环境中。室内污染物（例如甲醛）的光催化降解是最有前途和环保的技术之一。在这项工作中，通过简便的煅烧和溶胶-凝胶法开发了一种结合了石墨氮化碳（g-C3N4），TiO2和废沸石（g-C3N4-TiO2 /废沸石）的异质结构光催化剂。制备的光催化剂对甲醛降解表现出优异的可见光响应活性（k = 0.0127 min（-1）），高于g-C3N4-TiO2（k = 0.0123 min（-1））和P25（k = 0.0056） min（-1））。在商用LED灯下，在300分钟内，g-C3N4-TiO2 /废沸石可将90％以上的低浓度甲醛氧化。电子自旋共振谱表明可见光照射下在g-C3N4-TiO2 /废沸石上光生的超氧自由基阴离子（O-中心点（2）-）负责甲醛的分解。空气中甲醛的光催化分解作用增强可能是由于g-C3N4（增强了对可见光的吸收）和TiO2（来自g-C3N4的光生电子的快速转移）之间的异质结以及辅助气体的吸附。通过废沸石回收甲醛。这项工作还例证了将工业硅酸盐废物增值为用于室内空气净化的有效光催化涂层的价值。

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