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摘要: 以竹炭为载体，采用浸渍焙烧法制备竹炭/纳米TiO2材料（竹炭-TiO2材料），利用 SEM和EPR对竹炭及竹炭-TiO2材料进行表征，并分别在紫外灯、日光灯、白炽灯以及自然光照射条件下研究了竹炭-TiO2材料对甲苯的净化效果。结果表明：竹炭的孔隙主要以200nm左右的大孔为主，有利于TiO2在其表面和边沿的负载；竹炭-TiO2材料自旋数由8.7×1013(竹炭)增加到8.9×1017，氧化-还原能力显著提高；竹炭-TiO2材料对甲苯具有良好的净化能力，紫外光照射条件下，12h净化率达94.50%，CO2增加量达122mg/m3；在可见光条件下，12h净化率为76.80%，CO2增加量为60mg/m3，CO2的增加可能是由于载体竹炭扩展了二氧化钛的光谱响应范围。Abstract: TiO2 supported on bamboo charcoal (TiO2/C) was prepared by impregnating the charcoal with a TiO2 precursor and baking. The resulting material was characterized by SEM and EPR. Adsorption and degradation of toluene over the TiO2/C under a UV lamp, fluorescent lamp, incandescent lamp and sunlight was determined. Results showed that pore size in bamboo charcoal was centered around 200 nm and TiO2 was loaded on the rim and surface of the pores. The number of the un-paired electrons increased from 8.7×1013 for bamboo charcoal to 8.9 ×1017 for TiO2/C. The oxidationreduction ability of TiO2/C was significantly higher than that of bamboo charcoal. The toluene removal efficiency and the released CO2 were 94.50% and 122mg/m3 respectively after toluene was exposed to TiO2/C under UV for 12h. The corresponding figures were 76.80% and 60mg/m3 under sunlight for 12h in TiO2/C.
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Key words:
- Bamboo charcoal /
- Titanium dioxide /
- Adsorption /
- Degradation /
- Toluene
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