氟和氧化石墨烯共掺杂TiO2紫外光催化去除水中布洛芬的研究

UV Photocatalytic Removal of Ibuprofen from Water over Co-doped Titanium Dioxide with Fluorine and Graphene Oxide

布洛芬是目前地表水、地下水及饮用水等多种水体中频繁检出的新兴有机污染物。本文采用一步水热法制备了氟和氧化石墨烯共掺杂TiO2光催化剂(FGT),探究了其在紫外光照射条件下降解水体中布洛芬的效能及影响因素,并通过液相色谱质谱联用技术(LC-MS)对布洛芬降解过程中生成的中间产物进行了分析并推断其降解路径。结果表明,在催化剂投量0.05 g/L,pH为5.2的条件下,在0.1~10 mg/L的初始布洛芬浓度范围内,布洛芬的降解效能随着其初始浓度的增大而降低,100μg/L布洛芬约10 min即可完全降解;在0.025~0.1 g/L的催化剂投量范围内,催化剂最佳投量为0.05 g/L;且其在酸性及弱酸环境下的降解速率高于碱性环境;布洛芬在FGT紫外光催化降解过程中主要产生脱羧产物和羟基化产物。

Ibuprofen(IBP)is a new organic pollutant which can be detected in surface water,groundwater and drinking water.In this paper,the co-doped TiO2 with F and graphene oxide(GO)photocatalyst(FGT)was prepared by one-step hydrothermal method,and the degradation efficiency of ibuprofen by FGT under UV irradiation and its influencing factors were investigated.The intermediate products formed during the process were analyzed by liquid chromatography-mass spectrometry(LC-MS)and the degradation pathway was deduced.The results show that under the condition of catalyst dosage of0.05 g/L and pH of 5.2,the degradation efficiency of ibuprofen decreases with the increase of its initial concentration in the range of 0.1 to 10 mg/L and 100μg/L ibuprofen could be degraded at 10 min.The optimum dosage of catalyst is 0.05 g/L within the range of 0.025 to 0.1 g/L.The degradation rate in acidic or weak acid condition was higher than that in alkaline condition.And decarboxylation and hydroxylation occurred maily in the degradation of ibuprofen by FGT under UV light.