铁掺杂TiO<sub>2</sub>纳米粉光催化降解酸性刚果红

摘要采用水热技术制备了铁掺杂TiO₂光催化剂，并用SEM、XRD、FT-IR对其进行了表征；以紫外灯（λ=254 nm）作为光源、酸性刚果红为目标降解物进行光催化性能的研究。SEM表征结果：自制的催化剂粉末由直径为2~3 μm的TiO₂微米球形成，各微米球由八面体型的TiO₂纳米晶体（晶体长度1.0~1.5 μm）自组装所成，形成八面体的三角形边长200 nm左右。XRD表征结果说明：所得光催化剂粉末为锐钛矿相TiO₂（即A-TiO₂），在其3种晶相中（锐钛矿相、金红石相和板钛矿相）中有最好的光催化性能。FT-IR结果表明：所制的TiO₂结构中存在大量的-OH，预计它有较高的光催化活性。光催化实验表明：掺杂离子提高了TiO₂光催化性能，Fe³⁺掺杂量为6%（摩尔分数，下同）的TiO₂的光催化性能最好；在室温下，催化剂加用量1.2 g/L、降解时间10 min时，对60 mg/L酸性刚果红溶液（pH=6）的降解率达到82.73%。

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	张一兵
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关键词：铁掺杂TiO₂；水热法；光催化降解；酸性刚果红

Abstract： Fe-doping TiO₂ photocatalyst was prepared using hydrothermal method. The samples were characterized by means of SEM, XRD and FT-IR. The photocatalytic performance of TiO₂ samples was studied using ultraviolet lamp(λ=254 nm)as illumination device and acidic Congo red as stimulant pollutant. The SEM results show that TiO₂ crystal powders are formed by TiO₂ microspheres(diameters are 2~3 μm), which are a large scale self-assembly of octahedral TiO₂ nanocrystals (each nanocrystal's length is 1.0~1.5 μm), and individual TiO₂ octahedron has triangle planes about 200 nm inside. The XRD results indicate that the as-prepared titanium dioxide is anatase crystal(i.e. A-TiO₂), that is, which has the best photocatalytic activity among TiO₂'s three kinds crystal types (anatase, rutile and brookite). The results of FT-IR show that there are a lot of -OH groups in as-prepared TiO₂ nano-particles. Photocatalytic experiment for degradation of acidic Congo red showed that Fe³⁺ doping to TiO₂ improved the photocatalytic performance of TiO₂ samples. In the doping samples, 6% (molar fraction) Fe-TiO₂ was the most active. When at the room temperature, the degradation rate of reactive acidic Congo red whose initial concentration is 60 mg/L(pH=6)could reach 82.73% by catalyst of 1.2 g/L in 10 min.

Keywords： Fe³⁺-doping TiO₂； hydrothermal method； photocatalytic degeneration； acidic Congo red

Received 2017-05-04;

Fund:教育部第四批高等学校特色专业建设点资助项目（TS11524）；江西省精品课程资助项目（赣教高字[2011]74号）；江西省精品资源共享课资助项目（赣教高字[2015]79号）。

Corresponding Authors: 张一兵,E-mail:srxbzyb@163.com。 Email: srxbzyb@163.com

About author: 张一兵(1963-),男,教授,主要从事无机化学与无机材料的研究。

引用本文:

张一兵, 谢丽丽.铁掺杂TiO₂纳米粉光催化降解酸性刚果红[J]. 化学工业与工程, 2019,36(2): 28-33

Zhang Yibing, Xie Lili.Photocatalytic Degradation of Acidic Congo Red with Fe-Doping TiO₂ Nano-Powders[J]. Chemcial Industry and Engineering, 2019,36(2): 28-33

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