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CZTS-TiO2 thin film heterostructures for advanced photocatalytic wastewater treatment
Catalysis Today ( IF 5.3 ) Pub Date : 2017-12-07 , DOI: 10.1016/j.cattod.2017.12.003
Maria Covei , Dana Perniu , Cristina Bogatu , Anca Duta

While the photocatalytic degradation of dyes and other pollutants from wastewater by titanium dioxide (TiO2) is recognized as a highly efficient process, the cost of using UV radiation still prevents it from large-scale application. One method of moving from the UV activation energy towards the visible (Vis) spectral range could be the use of n-p heterostructures, with an overall band gap lower than that of TiO2. In this paper, thin film heterostructures based on TiO2 as n-type semiconductor and copper zinc tin sulfide (Cu2ZnSnS4, CZTS) as p-type semiconductor were tested in the dye removal of methylene blue, under Vis and solar simulated radiation. The thickness of the outer, TiO2 layer was varied by changing the precursor concentration (TiCl4, 0.05 M and 0.1 M). It was found that a higher titania film thickness promotes enhanced crystallinity, which is useful in a photocatalyst. From a morphological point of view, both samples showed a continuous coverage of the CZTS thin film, with multiple TiO2 aggregates on the heterostructure surface. The sample containing TiO2 prepared from the 0.05 M solution, exhibits Cu-poor, Zn-rich composition which promotes a better charge carrier transport in the material. This is confirmed by the higher dye removal efficiency (27.6%) of this sample, under Vis irradiation, for 8 h. The addition of 3% UV to the Vis radiation (simulated solar radiation) leads to a further increase of nearly 7.7% in the dye removal efficiency.



中文翻译:

用于先进光催化废水处理的CZTS-TiO 2薄膜异质结构

尽管二氧化钛(TiO 2)对废水中的染料和其他污染物进行光催化降解是公认的高效方法,但使用UV辐射的成本仍使它无法大规模应用。从UV活化能向可见(Vis)光谱范围移动的一种方法是使用n -p异质结构,其总带隙低于TiO 2的带隙。本文基于TiO 2作为n型半导体和铜锌锡硫化物(Cu 2 ZnSnS 4,CZTS)作为p的薄膜异质结构在可见光和太阳模拟辐射下,对2型半导体进行了亚甲基蓝的染料去除测试。外的厚度,的TiO 2层,通过改变前体浓度(变化的TiCl 4,0.05 M和0.1 M)。发现较高的二氧化钛膜厚度促进了结晶性的提高,这在光催化剂中是有用的。从形态学的角度来看,两个样品均显示连续覆盖CZTS薄膜,异质结构表面上有多个TiO 2聚集体。含TiO 2的样品由0.05 M溶液制得的化合物显示出贫铜,富锌的成分,可促进材料中更好的电荷载流子传输。在可见光照射8小时后,该样品的较高的染料去除效率(27.6%)证实了这一点。在Vis辐射(模拟的太阳辐射)中添加3%的UV,可以使染料去除效率进一步提高近7.7%。

更新日期:2017-12-07
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