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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY · 2023 ·Vol. 99 ·期 2 ·415-425 · IF 3.4

Indirect Z-scheme TiO2/BC/g-C3N4 for efficient photocatalytic reduction of Cr(VI) in aqueous solution

Mingliang Chen,Guanghui Wang,Jialing Dai,Haifeng Li,Nansheng Deng

BACKGROUND There is increasing concern regarding the rising issue of Cr(VI) pollution in aqueous solutions. It is crucial to find an effective technology for the removal of Cr(VI) in aqueous solutions. In this work, a novel TiO 2 /BC/g-C 3 N 4 heterostructure photocatalyst was successfully prepared by a simple hydrothermal method and characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Brunauer–Emmett–Teller analysis, Fourier transform infrared spectroscopy, photoluminescence, ultraviolet–visible diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The photocatalytic reduction behavior of Cr(VI) on the TiO 2 /BC/g-C 3 N 4 heterostructure was investigated under visible light irradiation, and the possible mechanism of photocatalytic reduction of Cr(VI) was elucidated. RESULTS The TiO 2 /BC/g-C 3 N 4 heterostructure photocatalyst exhibited better photoreduction activity for Cr(VI) under visible light irradiation. After 100 min irradiation with visible light, the TiO 2 /BC/g-C 3 N 4 photocatalyst achieved a removal efficiency of 89% for Cr(VI). Compared with TiO 2 , TiO 2 /BC and TiO 2 /g-C 3 N 4 , the photocatalytic removal efficiency of Cr(VI) on the TiO 2 /BC/g-C 3 N 4 increased by 40%, 20% and 10% respectively. The photocatalytic reduction of Cr(VI) was dependent on the initial concentration of Cr(VI), catalyst dosage, pH value and atmosphere. Moreover, TiO 2 /BC/g-C 3 N 4 presented excellent stability and reusability after five cycles. CONCLUSION The TiO 2 /BC/g-C 3 N 4 heterojunction enables highly efficient photocatalytic reduction of Cr(VI) under visible light irradiation. This enhancement is primarily attributed to the construction of an indirect Z-scheme TiO 2 /BC/g-C 3 N 4 heterojunction, which significantly improves the separation efficiency of photo- generated charge carriers during the photochemical process. Furthermore, the presence of BC enhances the adsorption performance of Cr(VI) on TiO 2 /BC/g-C 3 N 4 , thereby facilitating its photocatalytic reduction. © 2023 Society of Chemical Industry.

CAS / MDL: 64-17-5 108-78-1 7778-50-9 7761-88-8 5593-70-4 2564-83-2 9022-96-2

研究领域: 环境科学 · 材料科学

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CHEMOSPHERE · 2023 · IF 8.8

A novel BC/g-C3N4 porous hydrogel carrier used in intimately coupled photocatalysis and biodegradation system for efficient removal of tetracycline hydrochloride in water

Huanjun Zhang,Yanan Yu,Yi Li,Li Lin,Chi Zhang,Wenlong Zhang,Longfei Wang,Lihua Niu

Intimately coupled photocatalysis and biodegradation (ICPB) is a promising technology to remove refractory contaminants from water. The key to successful ICPB is a carrier capable of accumulating biofilm and adhering photocatalyst firmly. Herein, BC/g-C 3 N 4 was prepared into a three dimensional porous hydrogel and used as a carrier in ICPB system for the first time. Degradation experiments revealed that the removal rate of tetracycline hydrochloride (TCH) in water by the ICPB system was 96.0% after 10 h, which was significantly higher than that by the photocatalysis (PC, 76.3%), biodegradation (B, 32.5%), adsorption (AD, 17.2%), and photolysis (P, 5.0%) systems. Photo-electrochemical tests confirmed that ICPB system had superior electron transfer ability between photocatalysts and microorganisms . The removal efficiency of COD proved that microorganisms played an important role in the mineralization process of TCH by the ICPB system. After the ICPB degradation experiment, microorganisms maintained high activity and Pseudomonas , Burkholderiaceae and Flavobacterium which had TCH degradation or electron transport ability, were enriched. In conclusion, the novel ICPB carrier overcame shortcomings of the traditional ICPB carrier and the novel ICPB system had superior degradation performance for TCH. This study provided a possible method to promote the practical application of ICPB technology .

CAS / MDL: 7775-27-1 151-21-3 110-18-9

研究领域: 环境科学 · 水处理 · 光催化 · 生物降解 · 微生物学

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Indirect Z-scheme TiO2/BC/g-C3N4 for efficient photocatalytic reduction of Cr(VI) in aqueous solution

A novel BC/g-C3N4 porous hydrogel carrier used in intimately coupled photocatalysis and biodegradation system for efficient removal of tetracycline hydrochloride in water