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以表面活性剂聚乙二醇(PEG-6000)为模板剂,采用溶胶-凝胶法制备了溴氧化铋(BiOBr-PEG)光催化剂,运用XRD、SEM、BET和DRS对其结构及光化学特性进行了初步表征.在可见光(λ≥420nm)照射下,以有机污染料罗丹明B(Rhodamine B,RhB)和无色小分子水杨酸(Salicylic acid,SA)为目标化合物,研究了其光催化降解反应特性.结果表明:BiOBr-PEG具有优越的光催化活性,对RhB和SA都具有较好的降解效果,可见光照射40min和12h后,RhB和SA降解率分别达到98%和41%.同时,BiOBr-PEG催化剂稳定性良好,循环使用5次光催化活性基本稳定.光催化降解过程中涉及·OH和O·-2的氧化机理.
The BiOBr-PEG photocatalyst was prepared by sol-gel method using polyethylene glycol (PEG-6000) as a template. XRD, SEM, BET and DRS were used to characterize its structure and photochemical properties (Λ≥420nm), the organic pollutant Rhodamine B (RhB) and the colorless small salicylic acid (SA) were selected as the target compounds to study the effects of their light The results showed that BiOBr-PEG had excellent photocatalytic activity and good degradation effect on both RhB and SA. After 40 min and 12 h of visible light irradiation, the degradation rates of RhB and SA reached 98% and 41%, respectively. At the same time, the stability of BiOBr-PEG catalyst was good, and the photocatalytic activity was basically stable after 5 cycles of recycling.The oxidation mechanism of · OH and O · 2 involved in photocatalytic degradation.