氮掺杂纳米TiO_2光催化降解弱酸性染料的研究

Study on photocatalytic degradation of weak acid dye with N-doped nano-TiO_2

采用X射线衍射和紫外-可见光漫反射对用溶胶-凝胶法制备的氮掺杂纳米TiO2光催化剂进行了表征分析.以弱酸性艳蓝A染料溶液为目标净化物,研究了该催化剂的可见光催化性能.结果表明:氮掺杂纳米TiO2粉体的粒径为16.5 nm,锐钛矿相含量为98.7%,对紫外光和可见光均有较强吸收,其吸收边带达618 nm;催化剂用量为0.25 g,在300 W金卤灯下照射240 min,pH=2或12,对100 mL质量浓度为40 mg/L弱酸性艳蓝A染料溶液的净化率达99.2%.

Abstract： N-doped nano-TiO2 photocatalyst was prepared by sol-gel method and characterized by X-ray diffraction （XRD） and ultraviolet visible light spectroscope （UV-Vis DRS）. The visible light photocatalytic properties of the photocatalyst were investigated using Weak Acid Blue A dye solution as the target degrada- tion pollutant. The results showed that the particle size, content of anatase phase, and absorption band edge of photocatalysts were 16.5 nm, 98.7% and 618 nm, respectively, which had a higher absorption for ultraviolet and visible light. When the dosage of photocatalysts was 0.25 g, and the initial concentration and dosage of the weak Acid Blue A dye solution was 40 mg/L and 10.0 mL, the photodegradation rate of dye was 99.2% under 300 W metal halide lamp radiation for 240 min and the pH=2 or 12.