Preparation of Ag3PO4/WO3 composite photocatalyst and its visible light catalytic performance

doi:10.19965/j.cnki.iwt.2022-0254

Abstract

Abstract:

The Ag₃PO₄/WO₃ composite photocatalytic materials were prepared by in situ precipitation and used to degrade tetracycline hydrochloride（TC）. The apparent morphology，chemical composition and molecular structure of the synthesized materials were characterized by SEM，XRD，FT-IR，XPS and UV-vis DRS，and the effect of catalytic degradation of TC（10 mg/L） under visible light was used to evaluate the materials’ photocatalytic performance. Compared with single Ag₃PO₄ and WO₃，the Ag₃PO₄/WO₃ composites showed higher photodegradation performance for TC after 60 min of visible light irradiation，and the best performance was achieved at 25% mass fraction of WO₃，with the highest TC degradation rate of 84.82%，and the better photocatalytic activity was still achieved after five cycles. The results of the radical capture test and the analysis of electron paramagnetic resonance（ESR） spectra clarified that h⁺ and O₂^·- were the main active substances in the photocatalytic degradation of TC by Ag₃PO₄/WO₃ composites，and inferred the photocatalytic mechanism of the p-n type heterostructure of Ag₃PO₄/WO₃ composites.

Key words: Ag₃PO₄/WO₃, visible light, photocatalytic, tetracycline hydrochloride, p-n type heterostructure

摘要：

通过原位沉淀法制备了Ag₃PO₄/WO₃复合光催化材料并用于降解盐酸四环素（TC），利用SEM、XRD、FT-IR、XPS和UV-vis DRS等手段对合成材料的表观形貌、化学组成和分子结构等进行了表征，并以可见光下催化降解TC（10 mg/L）的效果来评价材料的光催化性能。与单一Ag₃PO₄和WO₃相比，可见光照射60 min后，Ag₃PO₄/WO₃复合材料对TC具有更高的光降解性能，WO₃质量分数为25%时性能最优，TC降解率达到最高84.82%，且经5次循环后仍具有较好的光催化活性。通过对自由基捕获试验以及对电子顺磁共振（ESR）光谱的分析，明确h⁺和O₂^·-为Ag₃PO₄/WO₃复合材料光催化降解TC过程中的主要活性物质，推断出Ag₃PO₄/WO₃复合材料为p-n型异质结光催化机理。

关键词: Ag₃PO₄/WO₃, 可见光, 光催化, 盐酸四环素, p-n型异质结

CLC Number:

X703

Wushuang MENG, Haicheng LIU, Guodong CHEN, Yu YOU, Hao ZHANG, Mengru CAO. Preparation of Ag₃PO₄/WO₃ composite photocatalyst and its visible light catalytic performance[J]. Industrial Water Treatment, 2023, 43(2): 89-97.

孟无霜, 刘海成, 陈国栋, 尤雨, 张皓, 曹梦茹. Ag₃PO₄/WO₃复合光催化剂的制备及其可见光催化性能[J]. 工业水处理, 2023, 43(2): 89-97.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2022-0254

https://www.iwt.cn/EN/Y2023/V43/I2/89

Figures/Tables 12

Fig. 1 XRD patterns of WO₃，Ag₃PO₄ and AW25%

Fig. 2 FT-IR spectras of WO₃，Ag₃PO₄ and AW25%

Fig. 3 SEM images of Ag₃PO₄和Ag₃PO₄/WO₃ composite material

Fig. 4 XPS spectras of AW25% photocatalysts

Fig. 5 UV-vis DRS，forbidden band width and valence band spectra of photocatalysts

Fig. 6 The degradation curves（a） and kinetic fitting curves（b） of TC by catalysts under visible light

Fig. 7 Mineralization test of photocatalysts

Fig. 8 AW25% photocatalyst cycling test

Fig. 9 Free radical capture test

Fig. 10 ESR spectrums of AW25% photocatalyst

Fig. 11 TypeⅡ heterostructure electron transfer pathway

Fig. 12 Photocatalytic mechanism of p-n type heterostructure

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Preparation of Ag₃PO₄/WO₃ composite photocatalyst and its visible light catalytic performance

Ag₃PO₄/WO₃复合光催化剂的制备及其可见光催化性能

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