Preparation of Z-type heterojunction ammonium phosphotungstate/CdS composite photocatalyst and photocatalytic degradation of tetracycline

IF 2.5 Q2 CHEMISTRY, MULTIDISCIPLINARY
Pengxi Li, Jingjing Yang, Zhonghong Liu, Zhiyong Jiang
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Abstract

Ammonium phosphotungstate (PW12NH4) nanoparticles were prepared via the hydrothermal method, and CdS nanocrystals were deposited on the PW12NH4 to construct the PW12NH4/CdS composite photocatalytic materials. The characterisation of the photocatalytic materials was conducted using a range of analytical techniques, including XRD, SEM, TEM, DRS, XPS and FTIR, thereby confirming the successful preparation of the composite photocatalytic materials. The degradation effect of the prepared photocatalytic materials on tetracycline was investigated, along with the mechanism of photocatalysis. The findings demonstrated that the PW12NH4/CdS (1:2) composite material exhibited the optimal degradation efficiency for tetracycline under visible light conditions, with a complete degradation rate of 99.7 % achieved within 60 min. The photocatalytic mechanism was explored by conducting free radical capture experiments, which confirmed that superoxide radicals (·O2) and holes (hVB+) were the main active substances in the photocatalytic process. The valence band and conduction band positions of PW12NH4 and CdS were calculated based on various tests, indicating that the PW12NH4/CdS composite photocatalytic material formed a Z-type heterojunction. This resulted in a broadened visible light absorption range, high redox ability, reduced recombination rate of photogenerated electrons and holes, and improved photocatalytic activity.

Abstract Image

z型异质结磷钨酸铵/CdS复合光催化剂的制备及四环素的光催化降解
采用水热法制备了磷钨酸铵(PW12NH4)纳米颗粒,并将CdS纳米晶体沉积在PW12NH4上,构建了PW12NH4/CdS复合光催化材料。利用XRD、SEM、TEM、DRS、XPS和FTIR等分析技术对光催化材料进行了表征,从而证实了复合光催化材料的成功制备。研究了所制备的光催化材料对四环素的降解效果,并探讨了光催化的机理。结果表明,在可见光条件下,PW12NH4/CdS(1:2)复合材料对四环素的降解效率最佳,60 min内完全降解率达到99.7%。通过自由基捕获实验探索了光催化机理,证实了超氧自由基(·O2−)和空穴(hVB+)是光催化过程中的主要活性物质。通过各种实验计算了PW12NH4和CdS的价带和导带位置,表明PW12NH4/CdS复合光催化材料形成了z型异质结。这导致可见光吸收范围扩大,氧化还原能力强,光生电子和空穴的复合速率降低,光催化活性提高。
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来源期刊
Results in Chemistry
Results in Chemistry Chemistry-Chemistry (all)
CiteScore
2.70
自引率
8.70%
发文量
380
审稿时长
56 days
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