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Green in-situ construction of OV-rich HAp/Mo2C Schottky junctions: Boosting antibiotic photodegradation performance and mechanistic insights.

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Title: Green in-situ construction of OV-rich HAp/Mo2C Schottky junctions: Boosting antibiotic photodegradation performance and mechanistic insights.
Authors: Tang, Jiaming1 (AUTHOR), Li, Xiaoyu1 (AUTHOR), Lv, Caizhi2,3 (AUTHOR), Hou, Xiandeng1,4,5 (AUTHOR), Xin, Hui1,4 (AUTHOR) xinhui@scu.edu.cn, Wu, Lan1,4 (AUTHOR) wulan@scu.edu.cn
Source: Separation & Purification Technology. Aug2026:Part 3, Vol. 397, pN.PAG-N.PAG. 1p.
Subjects: Photodegradation, Schottky barrier, Photocatalysis, Oxygen vacancy, Nanocomposite materials, Hydroxyapatite, Molybdenum compounds
Abstract: Developing materials with Schottky junctions has emerged as a powerful strategy for elevating the catalytic performance of photocatalytic systems. However, the semiconductor materials currently used in Schottky junctions often have disadvantages such as biotoxicity, poor chemical stability, and complex preparation, which limit their practical applications. Herein, utilizing hydroxyapatite (HAp), an nontoxic insulator with excellent chemical stability and facile synthesizability, and molybdenum carbide (Mo 2 C) featuring noble-metal-like properties, we fabricated oxygen vacancy-enriched Schottky junction nanocomposites (O V -HAp/Mo 2 C) with intimate interfacial contact via a facile strategy combining coprecipitation and in-situ calcination. The as-prepared materials were applied to the photocatalytic degradation of antibiotics. Photoelectrochemical characterization and DFT calculation results prove that the Schottky junction in the composite material enables unidirectional electron transfer from O V -HAp to Mo 2 C, promoting high-efficiency separation of photogenerated charge carriers. Under full-spectrum irradiation, the active radicals h+, ·O 2 −, and ·OH generated by O V -HAp/Mo 2 C attack norfloxacin (NOR), with a degradation efficiency of 92.3% within 15 min. The degradation rate constant was 0.0950 min−1, which was 6.4 times that of O V -HAp (0.0148 min−1). Besides, it exhibited good reusability with a modest decline after 5 cycles of tests. In addition, O V -HAp/Mo 2 C also exhibits good degradation performance for sulfamethoxazole, tetracycline, and kanamycin. Thus, this work provides novel insights into fabricating non-toxic, stable, and easily synthesizable Schottky junction materials. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Developing materials with Schottky junctions has emerged as a powerful strategy for elevating the catalytic performance of photocatalytic systems. However, the semiconductor materials currently used in Schottky junctions often have disadvantages such as biotoxicity, poor chemical stability, and complex preparation, which limit their practical applications. Herein, utilizing hydroxyapatite (HAp), an nontoxic insulator with excellent chemical stability and facile synthesizability, and molybdenum carbide (Mo 2 C) featuring noble-metal-like properties, we fabricated oxygen vacancy-enriched Schottky junction nanocomposites (O V -HAp/Mo 2 C) with intimate interfacial contact via a facile strategy combining coprecipitation and in-situ calcination. The as-prepared materials were applied to the photocatalytic degradation of antibiotics. Photoelectrochemical characterization and DFT calculation results prove that the Schottky junction in the composite material enables unidirectional electron transfer from O V -HAp to Mo 2 C, promoting high-efficiency separation of photogenerated charge carriers. Under full-spectrum irradiation, the active radicals h+, ·O 2 −, and ·OH generated by O V -HAp/Mo 2 C attack norfloxacin (NOR), with a degradation efficiency of 92.3% within 15 min. The degradation rate constant was 0.0950 min−1, which was 6.4 times that of O V -HAp (0.0148 min−1). Besides, it exhibited good reusability with a modest decline after 5 cycles of tests. In addition, O V -HAp/Mo 2 C also exhibits good degradation performance for sulfamethoxazole, tetracycline, and kanamycin. Thus, this work provides novel insights into fabricating non-toxic, stable, and easily synthesizable Schottky junction materials. [ABSTRACT FROM AUTHOR]
ISSN:13835866
DOI:10.1016/j.seppur.2026.138105