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采用一步溶剂热法制备了活化半焦负载还原氧化石墨烯掺杂二氧化钛新型负载型光催化剂,即rGO-TiO2/ASC。分别考察了高温水汽活化方法和还原氧化石墨烯rGO掺杂量对光催化脱硝性能的影响,并进一步探究光照条件、烟气氧含量和烟气湿度对NO氧化脱除的作用,得出新型负载型光催化剂rGO-TiO2/ASC光催化脱硝过程主要过程。结果表明,5%水汽高温活化半焦ASC的脱硝效率最高,反应4h后可达52%。rGO负载量为8%时,负载型光催化剂rGOTiO2/ASC脱硝性能4h后转化率达70.68%。有无O2对脱硝率影响较大,有无光照对其影响次之。无H2O时,脱硝率呈现先平稳后下降的趋势。新型负载型光催化剂rGO-TiO2/ASC的脱硝过程由光催化活性组分rGO-TiO2/ASC的光催化氧化和载体部分ASC的常规氧化两部分组成。
Abstract：In this study,supported photocatalyst rGO-TiO2/ASC fabricated by a one-step solvothermal method.Effect of activation condition on NO conversion over ASC(activated semi-coke)and rGO loading on NO conversion over rGO-TiO2/ASC photocatalyst has been investigated.The function of UV light,oxygen content and humidity on NO removal has been studied,which resulted in the main photocatalytic mechanism of novel supported photocatalyst rGO-TiO2/ASC during the process of NOx removal.The results showed that the optimal NO removal efficiencies of 52% and 70.68 % are obtained respectively over the ASC with 5% water vapour activation and 8% rGO-TiO2/ASC.The oxygen content exhibited a far great impact on NO removal than UV light.The NO conversion showed an increasing trend after a steady stage in the absence of H2 O.The results also suggested that the NO removal of novel supported photocatalyst rGO-TiO2/ASC was constituted of the photocatalytic oxidation of rGO-TiO2 and the normal oxidation of ASC.
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基本信息:
DOI：10.16441/j.cnki.hdxb.2014.10.013
中图分类号:X701;O643.36
引用信息:
[1]李春虎,杨微微,孙圣楠,等.rGO-TiO_2/ASC新型光催化剂用于烟气光氧化脱硝性能研究[J],2014,44(10):92-97.DOI:10.16441/j.cnki.hdxb.2014.10.013.
基金信息:
国家科技支撑十二五计划项目(2011BAD14B04)资助