Lu Yanjun,Sun Yajing,Li Jing,Xu Yuan,Han Qing,Wei Lixin,Sun Junqi,Guo Jifeng
The development of advanced photocatalysts is crucial for efficient photocatalytic degradation of the antibiotic tetracycline (TC). In this article, a series of BiOI/Bi 2 WO 6 (I/W) with different ratios (9:1, 7:3, 5:5, 3:7, 1:9) were synthesized by hydrothermal method and solvothermal method with BiOI as the primary material. XRD, SEM, FT-IR, XPS, and other analyses showed that the two monomers BiOI and Bi 2 WO 6 were well combined together. The degradation experiment was considered that the 7:3I/W photocatalytic composite has the best degradation effect on TC, which can degrade 84.81% of TC within 120 min. At the same time, the 7:3I/W composite has good stability after five cycles. In the 7:3I/W composite, BiOI and Bi 2 WO 6 were successfully recombined, and a p-n type heterojunction system was formed. This p-n type result not only greatly promoted the separation between e − and h + , but also significantly improved its photocatalytic performances. This paper provided a novel photocatalytic material for treating TC in water, and also created theoretical support for the composite of bismuth-based photocatalytic materials.
Bisphenol A (BPA) is a refractory pollutant presents in water body that possesses serious threats to living organisms. To deal with it, we investigate and evaluate the effectiveness of GO@BiOI/Bi 2 WO 6 composite as a novel photocatalyst for BPA removal from aqueous solutions under UV–vis irradiation. To enhance its removal for BPA, the surface of BiOI/Bi 2 WO 6 is modified with graphene oxide (GO). This composite is named as ‘GO@BiOI/Bi 2 WO 6 ’. Changes in its physico-chemical properties after surface modification with GO are characterized by XRD, FTIR, FESEM-EDS, XPS, PL, and BET methods. Optimized conditions of BPA degradation by the composite are determined under identical conditions. Photodegradation pathways of BPA and its removal mechanisms by the same composite are presented. It is obvious that the GO@BiOI/Bi 2 WO 6 has demonstrated its potential as a promising photocatalyst for BPA removal under UV–vis irradiation. About 81% of BPA removal is attained by the GO@BiOI/Bi 2 WO 6 under optimized conditions (10 mg/L of BPA, 0.5 g/L of dose, pH 7 and 5 h of reaction time). The oxidation by-products of BPA degradation include p -hydroquinone or 4-(1-hydroxy-1-methyl-ethyl)-phenol. In spite of its performance, the treated effluents are still unable to meet the maximum discharge limit of <1 mg/L set by national legislation. Therefore, subsequent biological processes are essential to maximize its biodegradation in the wastewater samples before their discharge into waterbody.
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