摘要
选择六氟苯作为目标化合物,利用266 nm脉冲激光照射磷钨酸与六氟苯的混合溶液证实了光催化转化六氟苯的可行性.结果表明,氟离子生成率与光照时间、pH值、磷钨酸初始投加量和添加物的量有关.氟离子生成率随激光脉冲次数的增加而升高.在溶液pH=1.0的条件下,氟离子生成率最高.2.0×10-4mol/L的六氟苯与5.0×10-6mol/L的磷钨酸的混合溶液在接受脉冲激光后,氟离子生成率可达208.1%.外加的氧化剂O2、KMnO4、K2S2O8可以有效氧化还原态的磷钨酸,实现整个光催化循环.溶液中存在的醇类及芳香族有机化合物不利于磷钨酸光催化转化六氟苯.
We verified that C6F6, a typical perfluorine compound, could be photocatalytic degraded by H3PW12O40. The defluorination of C6F6 was determined as a function of irradiation time, pH, initial concentration of H3PW12O40, and additives as well. The defluorination of C6F6 increased with the irradiation time. Acid condition, especially pH = 1.0 is preferred. 3 mL solution of 2.0 × 10^-4 mol/L C6F6 and 5.0 × 10^-6 mol/L H3PW12O40 was irradiated for 20 min and the defluorination of C6F6 was equal to 208.1%. 02, KMnO4 and K2S2O6 added in the solution were able to increase the defluorination of C6F6 via oxidating [PW12O40]^4-. The defluorination of C6F6 would decline in the presence of alcohol and aromatic compounds.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2006年第8期1501-1507,共7页
Environmental Science
基金
国家自然科学基金项目(20377009)
