Growth of AgBr/Ag 3 PO 4 Heterojunction on Chitosan Fibers for Degrading Organic Pollutants
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RESEARCH ARTICLE
Growth of AgBr/Ag3PO4 Heterojunction on Chitosan Fibers for Degrading Organic Pollutants Si‑wei Xiong1 · Yan Yu1 · Pei Wang1 · Man Liu1 · Shao‑hua Chen1 · Xian‑ze Yin1 · Luo‑xin Wang1 · Hua Wang1,2 Received: 26 February 2020 / Accepted: 30 April 2020 © Donghua University, Shanghai, China 2020
Abstract Using Fiber as the based material for photocatalyst particles is favorable for their recovery, thereby avoiding the photocatalyst particles cause secondary pollution to water environment. In this work, the AgBr and Ag3PO4 photocatalyst particles were loaded onto the surface of chitosan fiber (CF) via chelation and in situ anion-exchange method. The photocatalytic results illustrated that the AgBr/Ag3PO4/CF composites displayed the best photocatalytic performance when the mass ratio of Ag3PO4 and AgBr onto the CF was approximately 1:0.15, their degradation rate can reach 98.1% for the methyl orange (MO) solution, this value far exceeded those of pure CF, AgBr/CF composites, and Ag3PO4/CF composites. Besides, the AgBr/Ag3PO4/CF composites also shown excellent durability, after the fifth cycle, they still maintained a decolorization rate of 86.4% for the MO solution, while the Ag3PO4/CF composites maintained a decolorization rate of only 70.7%. Based on these results, we consider that the AgBr/Ag3PO4/CF composites have high practical interest in environmental remediation. Keywords AgBr · Ag3PO4 · Chitosan fiber · Photocatalytic degradation
Introduction Ag-based photocatalysts, such as AgX (X = Cl, Br, and I) [1–3], Ag2O [4], and A g2CO3 [5], among others, have been a topical study for the efficient photocatalytic degradation of dye pollutants [6]. Among these photocatalysts, Ag3PO4 was considered the most efficient visible-light-driven photocatalyst because of its good degradation of organic dyes and strong photooxidative capacity for O2 evolution from water under visible light irradiation [7]. Ag3PO4 is a yellowish solid and can be prepared by a precipitation reaction of silver nitrate (AgNO3) and N a2HPO3. Ag3PO4 is a body-centered cubic structure; its lattice parameter is a = b = c = 6.013 Å, and its point group is P-43n. A g3PO4 has a narrow band gap (Eg > 2.45 eV), which can absorb ultraviolet light and visible light ( 420 nm) [13, 40].
Experiment Materials Sodium bromide (NaBr), silver nitrate ( AgNO3) and disodium hydrogen phosphate (Na 2HPO 4), and MO were obtained from Sinopharm Chemical Reagent Corp. (P.R. China). Pure chitosan fiber was purchased by Zibo Lanjing Nanometer Material Co., Ltd. Deionized water was used throughout this experiment.
Preparation of AgBr/Ag3PO4/CF Composite A schematic of the growth process of AgBr and Ag3PO4 onto CF is displayed in Fig. 1. The AgBr/Ag 3PO 4/CF composites were prepared as shown below: 1 g of CF was immersed in 100 mL 0.3 mol/L silver nitrate solution and then the obtained mixed solution was maintained by uninterrupted stirring for 10 h at 25 °C. The obtained A g+/CF composites were washed by deionized water for five times
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