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首页> 外文会议>International Symposium on Heat Transfer Enhancement and Energy Conservation(ISHTEEC) vol.1; 20040112-15; Guangzhou(CN) >THE PHOTOCATALYTIC DEGRADATION OF INDOOR AIR CONTAMIANTS USING THIN FILM TIO2 PHOTOCATALYST
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THE PHOTOCATALYTIC DEGRADATION OF INDOOR AIR CONTAMIANTS USING THIN FILM TIO2 PHOTOCATALYST

机译：薄膜TiO2光催化剂光催化降解室内空气污染物

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Photocatalytic oxidation technology is an emerging technology for gas-phase pollution control, which using semiconductor TiO_2 as photocatalyst. Nitrogen dioxide and sulfur dioxide are the major city air contaminant and presents a significant health effect. The environmental pollutions of those contaminants have not been improved in recent 20 years and had become a major social problems. Nitrogen dioxide and sulfur dioxide can be photocatalytic degraded into SO _4~(2-) and NO_3~- respectively using TiO_2 as photocatalyst. Due to the conventional powder catalysts suffer from disadvantages in stirring during the reaction and separation after the reaction. Preparation of the catalysts coated as thin films make it possible to overcome these disadvantages and extend it to industrial application. In this paper, the German Degussa P-25 TiO_2 was used as photocatalyst. The thin films were prepared on the 8 pieces of 1 x 0.5 square meter common glasses via physical method. The effect of initial concentration of reactants on photocatalytic purifying efficiency was studied. The experiment of photocatalytic oxidation was fulfilled in a 2 x 2 x 1 cubic meter airproof container made of stainless steel. The commercial ultraviolet lamps were used as light source. The concentration of volatile contaminants varied from 0.5～5PPM. The changes of contaminant concentration were measured every two minutes by SO_2 analyser and NO_x analyzer separately, which was produced by American thermal electron company. The experimental results show that photocatalytic degradation rate increased with increasing initial concentration of NO_2 and SO_2. The L-H kinetic model was successfully applied to correlate the obtained data.
机译：光催化氧化技术是一种新兴的气相污染控制技术，它使用半导体TiO_2作为光催化剂。二氧化氮和二氧化硫是主要的城市空气污染物，对健康产生重大影响。这些污染物的环境污染在最近的20年中没有得到改善，已经成为一个主要的社会问题。以TiO_2为光催化剂，可将二氧化氮和二氧化硫分别光催化降解为SO_4〜（2-）和NO_3〜-。由于常规粉末催化剂在反应过程中搅拌和反应后分离的缺点。制备涂覆为薄膜的催化剂使得可以克服这些缺点并将其扩展到工业应用。本文以德国德固赛P-25 TiO_2为光催化剂。通过物理方法在8块1×0.5平方米的普通玻璃上制备薄膜。研究了反应物初始浓度对光催化净化效率的影响。在由不锈钢制成的2 x 2 x 1立方米密封容器中完成了光催化氧化的实验。商业紫外线灯被用作光源。挥发性污染物的浓度为0.5〜5PPM。由美国热电子公司生产的SO_2分析仪和NO_x分析仪分别每两分钟测量一次污染物浓度的变化。实验结果表明，随着NO_2和SO_2初始浓度的增加，光催化降解速率增加。 L-H动力学模型已成功应用于关联获得的数据。

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