【摘要】 汞灯、氙灯以及紫外灯，广泛用于光催化处理水体污染和研究。为减少这种高能耗光源的使用，实验采用溶胶-凝胶法制备了一种可在低耗LED灯下响应的铁掺杂纳米二氧化钛光催化剂。分析了其物相组成，微观形貌结构以及紫外和红外的光学吸收性质。在LED白灯照射条件下，探讨了Fe掺杂量、溶液初始浓度、初始pH对模拟废水罗丹明B溶液光催化降解的影响，并分析了其降解机理。结果表明，Fe³⁺的掺入加快了TiO₂锐钛矿相向金红石相的转变。在扫描电镜下纳米颗粒分布较均匀，团聚不明显。Fe³⁺的掺杂减小了TiO₂的禁带宽度并使光学吸收边红移，禁带宽度从3.2 eV显著降低到2.7 eV;但当Fe³⁺掺量过大时，纳米Fe-TiO₂光学吸收边蓝移，在可见光区域的活性明显降低。综合分析得：在摩尔比n（Fe）∶n（Ti）=0.3%,pH=7,经LED白灯（100 W）照射72 h,对罗丹明B去除率达89%。为利用低能耗LED灯光催化降解有机污染物提供参考。更多还原

【Abstract】 Mercury lamp, xenon lamp and ultraviolet lamp are widely used for photocatalytic treatment of water pollution and research. In order to reduce the use of high energy sources, an iron-doped nano-titanium dioxide photocatalyte which can respond under low-consumption LED lamp was prepared by sol-gel method. The physical phase composition, microscopic morphological structure and optical absorption properties in UV and IR were analyzed. The effects of Fe doping amount, initial concentration of solution and initial pH on the photocatalytic degradation of simulated wastewater rhoda mine B solution were investigated under LED white light irradiation conditions, and the degradation mechanism was analyzed. The results show that the doping of Fe³⁺ accelerates the phase transition from anatase to rutile in TiO₂. Under the scanning electron microscope, the nanoparticles are well distributed and the agglomeration is not obvious. Doping of Fe³⁺ decreases the band gap width of TiO₂ and makes the optical absorption edge red-shift, which decreases significantly from 3.2 eV to 2.7 eV. However, when the amount of Fe³⁺ doped is too high, the optical absorption edge of nano-Fe-TiO₂ shifts blue and its activity in the visible region decreases significantly. Comprehensive analysis shows that the removal rate of Rhoda mine B is 89% when irradiated by LED white light（100W） for 72 hours at molar ratio n（Fe）:n（Ti）=0.3% and pH=7. It provides reference for catalytic degradation of organic pollutants by low energy consumption LED lamp.更多还原