紫外光照射下钴钼杂多酸降解有机染料SRB

Photo-degradation of Organic Dye SRB by CoMo_x Heteropoly Acid under UV Irradiation

制备了不同配比的钴钼杂多酸(CoMox Heteropoly acids,CoMox),在紫外光(λ≤387 nm)照射下,以有机染料酸性桃红(Sulforhodamine B,SRB)的光催化降解为探针反应,研究了CoMox杂多酸不同配比及用量和体系介质pH值对其降解行为的影响.结果表明,最佳配比的钴钼杂多酸为CoMo12,在pH=3.0,CoMo12用量为1.0 g/L时,对SRB降解效果最好.在紫外光照射下,CoMo12活化O2,3.5 h内SRB脱色率达到96%.通过紫外-可见吸收光谱(UV-vis absorption spectrum),红外光谱(FTIR)和总有机碳(TOC)测定分析钴钼杂多酸对SRB的降解特性,同时采用苯甲酸荧光光度法跟踪测定降解过程中产生的活性氧化物种,表明CoMo12多酸对SRB的光催化降解过程主要涉及.OH氧化历程.

A series of CoMox heteropoly acids were prepared by traditional method.The photocatalytic degradation of organic dye sulforhodamine B（SRB） under UV light（λ≤387nm） was used as the probe reaction to evaluate the catalytic activity of CoMox.The effects of various proportions,the dosage of the catalyst and pH on the catalytic efficiency were explored.It is found that under a condition of pH 3.0 and catalyst dosage 50.0 mg,the CoMo12 has the best photocatalytic activity with 96 % decolouration of SRB after 3.5 h under UV irradiation.UV spectroscopy,IR and total organic carbon（TOC） measurements were used to detect and analyze the photocatalytic process of CoMox/UV/SRB system.During the photocatalytic process,hydrogen radicals（·OH） was detected in the system which indicated that ·OH radical involved the photocatalytic degradation of SRB by CoMox heteropoly acids.