Abstract
Antibiotic contamination has received widespread attention globally. In this work, the oxygen-doped porous graphite carbonitride (g-C3N4) was prepared with urea and ammonium oxalate (CNUC) or urea and glycine (CNUG) as precursors by thermal polymerization. Using bisphenol A (BPA) as a probe and CNUC or CNUG as photocatalysts, the removal performance test was carried out. Meanwhile, all prepared photocatalysts were characterized by XRD, FT-IR, SEM, TEM, XPS, UV-Vis DRS, PL and EIS. Under visible light irradiation, both CNUC and CNUG exhibited about seven and five times greater photocatalytic activity than that of pure g-C3N4, respectively. The radical capture experiments verified that superoxide radicals (•O2−) and holes (h+) were the main active species in the photocatalytic degradation of BPA by CNUC, and the possible photocatalytic mechanism of CNUC was proposed. In addition, all these results indicate that CNUC catalyst can effectually inhibit the photocorrosion and keep superior stability. The proposed technique provides a prospective approach to develop nonmetal-modified photocatalysts for future applications.
Highlights
Bisphenol A (BPA), named diphenol-based propane, is a low-toxic compound and an important raw material for the production of polycarbonate, epoxy resin, phenolic resin, some polysulfones, and some special materials [1]
Experiments have proved that bisphenol A (BPA) has an endocrine disruptor effect, which can be transferred to the environment through plastics, and it is increasingly detected in water environments, posing a serious threat to the ecosystem [3]
The chemical composition and element bonding of the prepared samples were analyzed by X-ray photoelectron spectroscopy (XPS) (Beijing Oubotong Optical Technology Co., Ltd., Beijing, China), and the XPS spectrum was recorded on the ESCALAB250Xi system equipped with a monochromatic Al Kα X-ray source
Summary
Bisphenol A (BPA), named diphenol-based propane, is a low-toxic compound and an important raw material for the production of polycarbonate, epoxy resin, phenolic resin, some polysulfones, and some special materials [1]. It has many advantages: (1) Carbon nitride has a unique layered structure, which can provide more active reaction centers and play a role in many application fields It can improve or strengthen the functionality of the host material, endowing it more excellent performance. The modification methods include element doping, the formation of heterostructures with other semiconductors, and the construction of micro-morphology [15] In these modification methods, the material for constructing the porous structure could increase the specific surface area of the catalyst and increase the carrier diffusion channel, thereby improving the light trapping capacity of the catalyst, accelerating the mass transfer process, leading to destruction and having more reactive sites. Ultrapure water (>18.2 MΩ) was used in this study
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