Visible-light-driven Activation of Persulfate by RGO/g-C3N4 Composites for Degradation of BPA in Wastewater

doi:10.15541/jim20190334

Abstract

Abstract:

Persistent organic pollutants can be effectively removed by photocatalytic oxidation, which reveals potential application prospects in the field of wastewater purification. Binary reduced graphene oxide and graphitic carbon nitride (RGO/g-C₃N₄) visible-light photocatalyst was successfully fabricated by the freeze drying assisted thermal polymerization method with urea and dicyandiamide as raw materials, respectively. The morphologies, structures and optical properties were characterized by various techniques. It was found that g-C₃N₄ and RGO nanostructures formed an intimate contact across the heterojunction interface. The photodegradation performances of catalysts were evaluated by removing bisphenol A (BPA) with the activation of persulfate (PS). The results indicated that the photocatalytic activities of photocatalysts were enhanced with the addition of PS as an oxidant and electron acceptor under visible light irradiation (λ>420 nm). Moreover, BPA was almost completely removed by RGO/g-C₃N₄ prepared with urea as raw material in 40 min. After five recovery tests, the removal efficiency of BPA for the catalyst was up to 80% within 40 min under visible light irradiation, which exhibited superior stability.

Key words: g-C₃N₄, reduced graphene oxide, visible-light photocatalysis, persulfate

CLC Number:

TQ174

ZHANG Sai, ZOU Yingtong, CHEN Zhongshen, LI Bingfeng, GU Pengcheng, WEN Tao. Visible-light-driven Activation of Persulfate by RGO/g-C₃N₄ Composites for Degradation of BPA in Wastewater[J]. Journal of Inorganic Materials, 2020, 35(3): 329-336.

Figures/Tables 10

Fig. 1 XRD patterns of GO, CNU, G-CNU, CND, and G-CND samples

Fig. 2 FT-IR spectra of GO, CNU, G-CNU, CND, and G-CND samples

Fig. 3 TEM images of (a) CND, (b) G-CND, (c) CNU, and (d) G-CNU photocatalysts

Fig. 4 N2 adsorption-desorption isotherms of CND, G-CND, CNU and G-CNU samples

Fig. 5 (a) C1s, (b) N1s and (c) O1s XPS spectra of CND, G-CND, CNU and G-CNU samples

Fig. 6 (a) The UV-Vis DRS and (b) the (αhν)1/2-hν curves of CND, G-CND, CNU and G-CNU photocatalysts

Fig. 7 PL spectra of different photocatalysts

Fig. 8 (a-c) Catalytic activities of photocatalysts for BPA degradation under different conditions, and (d) effects of solutionpH on BPA removal over G-CNU catalysts by activating PS under visible light irradiation (λ>420 nm) (a) Visible light; (b) PS and (c) visible light/PS; Reaction conditions: C0(BPA) = 10 mg·L-1, C0(catalyst) = 0.5 g·L-1, C0(PS) = 1.0 g·L-1

Fig. 9 Cycling tests in degradation of BPA over G-CNU by PS activation under visible light irradiation (λ>420 nm)

Fig. 10 (a) Effect of different radical scavengers on BPA degradation in the G-CNU suspension under visible light irradiation (λ>420 nm) with the addition of PS, and (b) schematic diagram of photodegradation mechanism Reaction conditions: C0(BPA) = 10 mg·L-1, C0(catalyst) = 0.5 g·L-1, C0(PS) = 1.0 g·L-1

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Visible-light-driven Activation of Persulfate by RGO/g-C₃N₄ Composites for Degradation of BPA in Wastewater

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