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2021, 04, 72-77
纳米TiO2/沸石复合光催化剂的制备及光催化性能
基金项目(Foundation): 江苏省自然科学基金项目(BK20190925);; 南通市基础研究计划项目(JC2018003);; 江苏省先进纺织工程技术中心开放基金科研项目(XJFZ/2018/18)
邮箱(Email):
DOI: 10.12194/j.ntu.20200105001
摘要:

为了解决悬浮式二氧化钛(TiO2)光催化剂易凝聚失活、分离困难等问题,采用沸石(NaY)分子筛对TiO2进行负载,优化TiO2/NaY复合催化剂制备工艺条件,探究NaY的引入及用量对TiO——2晶型、相转变温度、催化活性的影响。结果表明:当TiO2负载量为35%、焙烧温度500℃、焙烧时间2 h、催化剂用量0.08 g(亚甲基蓝溶液100 mL)时,TiO——2/NaY复合催化剂显示出最佳催化降解效果,对初始质量浓度为20 mg/L的亚甲基蓝溶液光催化降解0.5 h,降解率达95.42%,比纯TiO2提高了22.3%。NaY的高稳定性、高紫外光穿透性,以及丰富规整的微孔和笼结构,不仅可以解决TiO2回收问题,还能改善TiO2光催化效果。

Abstract:

The major problems of TiO2 photocatalyst are easy aggregation and deactivation, and obvious difficulty in separation. In order to overcome some of the drawbacks of TiO2 photocatalyst in suspension, zeolite(NaY) molecular sieves were used to support TiO2. The preparation conditions of TiO2/NaY composite photocatalyst were optimized in this research. Moreover, the effect of NaY on crystal type, phase transition temperature and photocatalytic properties was investigated, and the influence of TiO2/NaY on the degradation of organic waste water was analyzed. The results indicate that the TiO2/NaY composite photocatalyst exhibits the optimal photocatalytic activity under the conditions of TiO2 loading of 35%, sintering temperature of 500 °C, roasting time of 2 h and catalyst dosage of 0.08 g(methylene blue solution of 100 mL). When methylene blue solution of an initial concentration of 20 mg/L was treated for 0.5 h with TiO2/NaY composite photocatalyst, the photocatalytic degradation rate was 95.42%, 22.3% higher than that of TiO2. High stability, high ultraviolet light transmission and regular microporous and cage structure of NaY is conducive to not only recycle of TiO2 but also improvement of photocatalytic activity of TiO2.

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基本信息:

DOI:10.12194/j.ntu.20200105001

中图分类号:O643.36;O644.1;X703

引用信息:

[1]杨婷婷,潘刚伟,景晓辉.纳米TiO_2/沸石复合光催化剂的制备及光催化性能[J],2021(04):72-77.DOI:10.12194/j.ntu.20200105001.

基金信息:

江苏省自然科学基金项目(BK20190925);; 南通市基础研究计划项目(JC2018003);; 江苏省先进纺织工程技术中心开放基金科研项目(XJFZ/2018/18)

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