CuBi2O4/Bi2WO6 Z-type Heterostructures for Effective Removal Ciprofloxacin in Photo-electro-Fenton-like System

doi:10.7503/cjcu20230370

Abstract

Abstract:

In response to the serious problem of antibiotic pollution in the current water environment， herein， a CuBi₂O₄/Bi₂WO₆（CBWO） Z-type heterojunction photoelectric catalyst was synthesized by a simple solvothermal method. The morphology and structure were obtained through SEM， which showed that the structure of the CBWO-60 was cuboid rod-like morphology and nanosheet. The EDS elemental mapping images displayed that Cu， W， Bi and O elements were evenly dispersed in CBWO-60. The crystalline phases and molecular structures of the catalyst were determined by XRD and FTIR. These results firmly confirmed that the successful synthesis of the composite. The large specific surface area of CBWO-60 was investigated via BET. XPS analysis proved that the Cu⁺ and Cu²⁺ coexisted， which promoted the cycling of Fenton reaction. Moreover， the displacement of binding energy well verified the strong electronic interaction rather than a physical contact between CuBi₂O₄ and Bi₂WO₆ in the heterojunction. The band structure of the heterojunction was proved by UV-Vis DRS and VB-XPS analysis. The interface charge transfer situation of the heterojunction was investigated by PL， EIS， and transient photocurrent response spectra. In a series of catalysts， CBWO-60 has the highest degradation efficiency for Ciprofloxacin（CIP） in the photo-electro- Fenton-like（PEF-like） system， with a degradation efficiency of 98.0% at 90 min. At the same time， when the initial pH of the solution was in the range of 2—6， the system could always maintain effective CIP removal efficiency. The pH range of this system was broadened to some extent compared to the conventional Fenton method. In the PEF-like system， CBWO-60 showed high catalytic activity to quinolone， sulfonamides and tetracycline antibiotics， which proved the universality of CBWO-60. Finally， the degradation efficiency of CIP still maintained 87.8% after five cycles of experiments， and the crystal structure of CBWO-60 remained unchanged after the reaction. Based on the results of HPLC-MS， five possible pathways for CIP degradation were proposed. This study provided a new idea for the purification and treatment of antibiotic pollution in the water environment.

Key words: Photo-electro-Fenton-like system, CuBi₂O₄/Bi₂WO₆, Z-type heterojunction, Ciprofloxacin, Reactive oxygen species

CLC Number:

O643

TrendMD:

WANG Qiuxia, HAN Yugui, ZHAO Peng, WANG Shuang, LIU Yaru, LI Yi. CuBi₂O₄/Bi₂WO₆ Z-type Heterostructures for Effective Removal Ciprofloxacin in Photo-electro-Fenton-like System[J]. Chem. J. Chinese Universities, 2024, 45(1): 20230370.

Figures/Tables 12

References 36

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Catalyst	Specific surface area/（m²·g^-1）	Pore volume/（cm³·g^-1）	Average pore size/nm
Bi₂WO₆	78.7	0.145	5.55
CuBi₂O₄	3.6	0.028	3.80
CBWO⁃60	21.9	0.046	3.82

Catalyst	Specific surface area/（m²·g^-1）	Pore volume/（cm³·g^-1）	Average pore size/nm
Bi₂WO₆	78.7	0.145	5.55
CuBi₂O₄	3.6	0.028	3.80
CBWO⁃60	21.9	0.046	3.82

Catalyst	R_s	10⁷CPE⁃T	CPE⁃P	R_ct	W_o⁃R	W_o⁃T	W_o⁃P
Bi₂WO₆	19.16	1.9137	1.077	49.44	488	1.7193×10^-3	0.65102
CuBi₂O₄	18.73	1.2728	1.037	72.15	13.1	1.2344×10^-5	0.35936
CBWO⁃60	19.99	2.0426	1.030	43.98	1.244	4.0139×10^-7	0.36839

Catalyst	R_s	10⁷CPE⁃T	CPE⁃P	R_ct	W_o⁃R	W_o⁃T	W_o⁃P
Bi₂WO₆	19.16	1.9137	1.077	49.44	488	1.7193×10^-3	0.65102
CuBi₂O₄	18.73	1.2728	1.037	72.15	13.1	1.2344×10^-5	0.35936
CBWO⁃60	19.99	2.0426	1.030	43.98	1.244	4.0139×10^-7	0.36839

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CuBi₂O₄/Bi₂WO₆ Z-type Heterostructures for Effective Removal Ciprofloxacin in Photo-electro-Fenton-like System

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