Fabrication of a Novel AgBr/Ag2MoO4@InVO4 Composite with Excellent Visible Light Photocatalytic Property for Antibacterial Use

Abstract

A novel AgBr/Ag2MoO4@InVO4 composite photocatalyst with different heterojunction structures was successfully constructed by compounding InVO4 with Ag2MoO4 and AgBr. According to the degradation, antibacterial and free radical trapping data, the photocatalytic antibacterial and antifouling activities of AgBr/Ag2MoO4@InVO4 composite were evaluated, and the corresponding photocatalytic reaction mechanism was proposed. Adding AgBr/Ag2MoO4@InVO4 composite, the degradation rate of ciprofloxacin (CIP) achieved 95.5% within 120 min. At the same time, the antibacterial rates of Escherichia coli (E. coli), Staphylococcus aureus (S. aureus) and Pseudomonas aeruginosa (P. aeruginosa) achieved 99.99%. The AgBr/Ag2MoO4@InVO4 composite photocatalyst showed promising usage in photocatalytic antibacterial and purification areas.

Photocatalytic Degradation and Antibacterial Properties of Fe3+-Doped Alkalized Carbon Nitride

“…In the dark, there are more •OH formed by AKCN and AKCN-xFe than CN, especially AKCN-0.010Fe, indicating that Fe 3+ doping is conducive to hydroxyl groups grafting, which is consistent with the result of FTIR. Finally, •O − 2 and •OH destroyed the organic macromolecules and broke the bacterial cell walls and membranes, leading to the complete conversion of organic macromolecules into nontoxic and harmless CO 2 and H 2 O [68,69]. Therefore, it can be inferred that •O − 2 and •OH have a primary role in improving the photocatalytic pollutant degradation and antibacterial performance of AKCN-0.010Fe.…”

Effect of Cu doping on the photocatalytic activity of InVO4 for hazardous dye photodegradation under LED light and its mechanism

“…Table S1 illustrates the N 2 adsorption-desorption isotherms of all the synthesized catalysts. At higher relative pressure region (P/P 0 ¼ 0.8-1); pristine InVO 4 and xCu-InVO 4 (x ¼ 0.06-0.15) catalysts displayed type IV isotherms with H3 hysteresis loops suggesting the presence of mesopores in the samples (Sing et al 1985;Hoan et al 2020;Zhang et al 2020aZhang et al , 2020bZhang et al , 2020c. To further confirm the presence of such pores, Barrett-Joyner-Halenda (BJH) pore size distribution studies were carried out.…”

“…As illustrated in Figure S3, the photocatalysts have a bimodal pore system centred on ∼3.7 nm and ∼40 nm. The relatively smaller pores (inset) are ascribed to the mesopores within the InVO 4 cracks, whereas the larger pores are believed to be due to the formation of larger mesopores or macropores between the InVO 4 particles (Zhang et al 2020a(Zhang et al , 2020b(Zhang et al , 2020c.…”

“…However, ineffective charge-carrier separation in its pure form severely restricts its application in photocatalysis (Chaison et al 2017). Since the discovery of its photocatalytic activity, InVO 4 has been modified by forming integrated photocatalytic systems such as BiVO 4 /InVO 4 (Guo et al 2015), TiO 2 /InVO 4 /RGO (Lin et al 2015a(Lin et al , 2015b, In 2 S 3 /InVO 4 (Yuan et al 2019), InVO 4 /β-AgVO 3 (Yang et al 2019), InVO 4 -g-C 3 N 4 /rGO (Hafeez et al 2020), InVO4/ZnFe 2 O 4 (Wang et al 2020a(Wang et al , 2020b, Ag-SnS 2 @InVO 4 (He et al 2020), and AgBr/Ag 2 MoO 4 @InVO 4 (Zhang et al 2020a(Zhang et al , 2020b(Zhang et al , 2020c. Although heterojunction formation is efficient in lowering the recombination rate of photo-excited species, it still suffers from two major drawbacks.…”

“…By adding charge trapping sites (dopants), the recombination rate will be quenched, and the lifespan of the photo-excited species will be prolonged to enhance the photocatalytic activity of the semiconductor (Imam et al 2018). In the past, InVO 4 based photocatalysts were successfully modified with metals including Pt (Yan et al 2012), Ag (Lin et al 2015a(Lin et al , 2015b, Cu (Wetchakun et al 2017), Bi (Wang et al 2020a(Wang et al , 2020b, Yb and Tm (Zhang et al 2020a(Zhang et al , 2020b(Zhang et al , 2020c.…”