TiO_(2)/石墨烯光催化技术在枫江污染治理中的应用研究

Application of TiO_(2)/ graphene photocatalysis technology inpollution control of Fengjiang River

对枫江污染水样进行了水质和主要污染物质的检测,实验结果表明水样有机污染特征明显。采用溶胶凝胶法制备的TiO_(2)/石墨烯(GR)复合材料为光催化剂,在模拟太阳光下对水样进行光催化处理。考察了光照时间、水样浓度、催化剂浓度和酸度等因素对光催化处理效果的影响。结果表明:光照时间越长、水样浓度稀释得越低、催化剂的浓度越大、酸度值越小,越有利于水样中有机污染物的光催化降解。原水样在催化剂浓度为1 g/L时,经过120 min光照或者在催化剂浓度为2 g/L时,经过60 min光照,水样中有机污染物的降解率均可达到95%以上;当水样的浓度稀释为原水样的1/5时或者将水样的酸度调节到pH=1,在催化剂浓度为1 g/L时,经过60 min光照后,水样中的有机污染物则可以100%被降解。经过光催化处理后的水样,各项水质分析项目的浓度值均达到Ⅱ类水平以上,水质明显改善。

The main items exceeding the standard in the polluted water of Fengjiang River were tested by various analysis methods.The experimental results show that the organic pollution characteristics of water samples are obvious.TiO_(2)/graphene(GR)composite fabricated by the method of sol-gel was used to degrade water samples under simulated sunlight.The effects of illumination time,pollutant concentration in water sample,catalyst concentration and acidity on photocatalytic reaction were investigated.Results showed that the condition of the longer illumination time,lower concentration of the dilution,higher concentration of catalyst and lower acidity value,is beneficial for the photocatalytic degradation of organic pollutants in water samples.The degradation rate of organic pollutants in the raw water samples could reach more than 95%after 120 min illumination at a catalyst concentration of 1g/L or 60 min of light at a catalyst concentration of 2g/L.When the concentration of the water sample is diluted to 1/5 of the original water sample,or the acidity of the water sample is adjusted to pH=1,the organic pollutants in the water sample could be degraded to 100%after 60 min illumination at a catalyst concentration of 1g/L.After photocatalytic treatment,the concentration values of various tested items reached above class II level,and the water quality has been improved significantly.