Preparation of NH2-UiO-66/BiOBr Heterojunction Photocatalyst and Its Degradation Performance for Ofloxacin

doi:10.11901/1005.3093.2024.482

Chinese Journal of Materials Research

2025, Vol. 39

Issue (10): 777-790 DOI: 10.11901/1005.3093.2024.482

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Preparation of NH₂-UiO-66/BiOBr Heterojunction Photocatalyst and Its Degradation Performance for Ofloxacin

REN Xuechang(

), PANG Xuchuang, LU Zerui, CHEN Hongjin, JU Hongbin, ZHANG Guanguo, LI Zhongshan

School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

Cite this article:

REN Xuechang, PANG Xuchuang, LU Zerui, CHEN Hongjin, JU Hongbin, ZHANG Guanguo, LI Zhongshan. Preparation of NH₂-UiO-66/BiOBr Heterojunction Photocatalyst and Its Degradation Performance for Ofloxacin. Chinese Journal of Materials Research, 2025, 39(10): 777-790.

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Abstract

The NH₂-UiO-66/BiOBr heterojunction photocatalyst was synthesized via a solvothermal method, and its physicochemical properties were systematically characterized using XRD, SEM, TEM, FT-IR, XPS, and UV-Vis spectroscopy. The results confirmed the formation of a stable Z-scheme heterojunction structure between NH₂-UiO-66 and BiOBr, which significantly improved the separation and migration efficiency of photogenerated electron-hole pairs. Under the irradiation of an artificial sunlight, the NUB-1 composite (mass ratio 1∶1) achieved a remarkable 92.48% degradation rate for ofloxacin (OFX), significantly outperforming the performance of either of the two components. NUB-1 also exhibited broad pH adaptability and showed minimal sensitivity to inorganic anions. Photoelectrochemical analyses indicated that NUB-1 exhibited superior charge separation and transport capabilities. Results of reactive species trapping tests and ESR analysis confirmed that holes (h⁺) and superoxide radicals (•O $2 -$ ) were the main active species. Furthermore, NUB-1 showed high degradation efficiency for various organic pollutants. After five cycles, the degradation rate remained at 82.11%, demonstrating exceptional stability and reusability.

Key words: metallic materials NH₂-UiO-66 heterojunction photocatalysis ofloxacin

Received: 09 December 2024

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	REN Xuechang
	PANG Xuchuang
	LU Zerui
	CHEN Hongjin
	JU Hongbin
	ZHANG Guanguo
	LI Zhongshan

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.482 OR https://www.cjmr.org/EN/Y2025/V39/I10/777

Fig.1 Standard curve of OFX

Fig.2 XRD patterns of NH₂-UiO-66, BiOBr, and NH₂-UiO-66/BiOBr composites with different ratios

Fig.3 FT-IR spectra of NH₂-UiO-66, BiOBr and NUB-1 composite

Fig.4 SEM image of NH₂-UiO-66 (a), BiOBr (b) and NUB-1 (c), and EDS elemental mapping images of NUB-1 for C (d), N (e), O (f), Br (g), Zr (h), Bi (i)

Fig.5 TEM images of NUB-1 (a) low magnification, (b) high magnification, (c) HRTEM image

Fig.6 XPS survey spectrum of NUB-1 (a) and high-resolution XPS spectra of C 1s (b), N 1s (c), O 1s (d), Zr 3d (e) and Bi 4f (f)

Fig.7 N₂ adsorption-desorption isotherms (a) and pore size distribution of NH₂-UiO-66 (b), BiOBr (c) and NUB-1 (d)

Fig.8 UV-Vis diffuse reflectance spectra (a), Tauc plots of different samples (b-d), and Mott-Schottky plots of NH₂-UiO-66 (e) and BiOBr (f)

Fig.9 Transient photocurrent response (a), EIS (b) and PL (c)

Fig.10 Photocatalytic degradation curves (a) and reaction rate constant (b) of ofloxacin over materials with different composite ratios

Fig.11 Degradation curves (a) and reaction rate constants (b) of NUB-1 with different dosages

Fig.12 Effect of pH on OFX degradation (a) and reaction rate constant (b)

Fig.13 Effect of inorganic anion on OFX degradation (a) and reaction rate constant (b)

Fig.14 Cycle stability of NUB-1 sample

Fig.15 Degradation curves of NUB-1 to different pollutants

Fig.16 Experiment of capture of active species

Fig.17 ESR spectra of DMPO-•O₂^- (a), TMEPO-h⁺ (b), DMPO-•OH (c), and TMEPO-¹O₂ (d)

Fig.18 Mechanism of the photocatalytic degradation of OFX by the NH₂-UiO-66/BiOBr Z-scheme heterojunction photocatalyst

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