漂浮负载型光催化剂制备及降解草甘膦研究
Study on preparation of float loaded photocatalyst and degradation of glyphosate pesticide
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摘要: 以漂珠（FP）为载体，采用溶胶-凝胶-浸渍法制备了漂浮负载型CdS/TiO2/FP复合膜光催化剂，通过SEM、XRD对其结构进行了表征。以甘草膦农药的光催化降解为模型反应，使用不同光源研究了CdS/TiO2/FP的光催化性能，探讨了影响催化剂活性的因素及采用太阳光做光源处理草甘膦的可行性。结果表明, 经4层镀膜500 ℃热处理的20%(w/w)CdS/TiO2/FP光催化剂具有良好的光催化性能，最佳降解条件为：催化剂加入量3 g/L，初始pH 7～9，Fe2+浓度为2.0×10-3mol/L,通气量200 mL/min。在最佳条件下，对135 mg/L草甘膦溶液降解率可以分别达到96.3%(125 W高压汞灯，60 min) 和82.4%(太阳光，180 min)。Abstract: As float pearls(FP) used as an carrier, the float loaded photocatalyst of CdS/TiO2/FP(float pearls) was prepared by sol-gel-dipping method, and its structure characterization was carried out with SEM and XRD analysis. As a model reaction, the photocatalytic degradation of glyphosate was investigated in CdS/TiO2/FP suspension irradiated by defferent light sources. The effects of influencing factors on the photocatalytic activety were discussed for the preparaed photocatalyst CdS/TiO2/FP. The results showed that the photocatalyst had a good catalytic characteristics under the following conditions: amount of CdS in TiO2 20%(w/w), 4 layers loaded, heat treatment temperature 500 ℃, The optimum degradation conditions were obtained to be amount of photocatalyst 3 g/L, initial pH 7～9,concentration of Fe2+ 2.0×10-3mol/L and air flow rate 200 mL/min respectively. The degradation rate of glyphosate could reach to 96.3%(125 W Hg lamp in 60 min) and 82.4%(solar light in 180 min) for initial concentration of glyphosate 135 mg/L, respectively.
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Key words:
- photocatalytic degradation /
- coupled photocatalyst /
- CdS/TiO2 /
- float pearls /
- glyphosate
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