室內揮發性有機物甲苯光電催化處理之研究

Abstract

目前室內揮發性有機物處理主要以光催化(Photo Catalysis Oxidation，PCO)處理，然而仍存在有礦化率不足的問題，近年有相關文獻指出光電催化確實能增加礦化率及增加降解率，因為反應的一些中間產物毒性更高，反而造成對室內人員的健康危害。另外，目前光催化處理仍以紫外光為主，對於在室內環境應用，仍有安全疑慮。本研究將以光電共同催化(Photoelectrocatalysis Oxidation，PEC)技術，提昇室內揮發性有機物降解率。另外，並結合TiO2 、Ag/AgBr/TiO2 光觸媒，Ag/AgBr/TiO2除紫外光以外，也具可見光吸收能力，可提升揮發性有機物礦化率，降低危害性中間產物的產生，並提供對人體健康較安全方法。本研究方法利用新型光電催化反應器加上TiO2與Ag/AgBr/TiO2光觸媒做揮發性有機物甲苯降解，另外再分析TiO2與Ag/AgBr/TiO2光觸媒表面性能分析。本研究固定因子條件用10ppmv甲苯濃度作為固定進流濃度，變因條件為電壓、光波長(254nm及420nm波長)、相對濕度及氣體流量。實驗依據文獻參考使用高反應效率比例(139.2%Ag/AgBr/TiO2)配置Ag/AgBr/TiO2與一般P25二氧化鈦來進行光催化與光電催化降解室內VOCs甲苯比較，結果發現改質Ag/AgBr/TiO2在流速0.7LPM停留時間8秒、相對濕度30%，單純紫外光照射下有效率降解率高達99.28%，而可見光外加電壓0.4V則為98.44%，而一般P25停留時間8秒、相對濕度30%、最高降解效率則達到35.18%，外加電壓0.4伏特條件下，最高降解效率則達到44.04%，一般P25在紫外光外加1伏特電壓處理時則最高降解率在71.72%，實驗結果證明可見光光電催化與改質光觸媒共同處理室內空氣汙染VOCs具有未來之發展潛力。

The main indoor volatile organic compounds present in the photocatalytic process (Photo Catalysis Oxidation, PCO) process , but there is still the problem of inadequate mineralization rate in recent years, relevant literature noted photoelectrocatalysis can really increase the rate of mineralization and increase the degradation rate , because higher intermediate toxicity , but the cause of the person in the room health hazard. In addition , there is still UV photocatalytic treatment mainly for use in an indoor environment , there are safety concerns. This study will be co- catalytic photovoltaic (Photoelectrocatalysis Oxidation, PEC) technology to enhance indoor volatile organic compounds mineralization . In addition, combined with TiO2, Ag / AgBr / TiO2 photocatalyst, Ag / AgBr / TiO2 in addition to ultraviolet light, and a visible light absorption capability, volatile organic compounds to enhance the rate of mineralization, reduce produce harmful intermediate products, and to provide the human body health safer method. In this study, using a new method of photoelectric catalytic reactor coupled with TiO2 and Ag / AgBr / TiO2 photocatalyst do toluene degradation of volatile organic compounds, in addition to the analysis of TiO2 and Ag / AgBr / TiO2 photocatalyst surface properties analysis. In this study, factor conditions fixed by 10ppm concentration of toluene as a fixed inflow concentration change due to voltage conditions, the optical wavelength (254nm and 420nm wavelength), relative humidity and gas flow. Experimental basis References to use high reaction efficiency ratio (139.2% Ag / AgBr / TiO2) configuration Ag / AgBr / TiO2 and general P25 titanium dioxide photocatalytic and photoelectric catalytic degradation of indoor VOCs toluene comparison found that the modified Ag / AgBr / TiO2 flow rate 0.7LPM residence time 8 seconds, 30% relative humidity, ultraviolet light alone at rate degradation efficiency 99.28%, while the visible light applied voltage was 0.4V 98.44%, while in general the residence time 8 seconds P25, relative humidity 30% the maximum degradation efficiency reached 35.18%, plus a 0.4 V voltage conditions, the maximum degradation efficiency reached 44.04%, while general P25 1 volt in the UV treatment is applied at the maximum degradation rate of 71.72%, experimental results show that the visible and Photoelectrocatalytic modified photocatalyst together on indoor air pollution VOCs have the potential for future development.