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Open AccessArticle

In Situ Construction of a MgSn(OH)6 Perovskite/SnO2 Type-II Heterojunction: A Highly Efficient Photocatalyst towards Photodegradation of Tetracycline

1
Department of Biological and Chemical Engineering, Cooperative Innovation Center of Lipid Resources and Children’s Daily Chemicals, Chongqing University of Education, Chongqing 400067, China
2
College of Chemistry and Chemical Engineering, Chongqing University of Technology, 69 Hongguang Rd., Lijiatuo, Banan District, Chongqing 400054, China
3
Analytical and Testing Center of Chongqing University, Chongqing 401331, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(1), 53; https://doi.org/10.3390/nano10010053
Received: 14 November 2019 / Revised: 20 December 2019 / Accepted: 21 December 2019 / Published: 24 December 2019
(This article belongs to the Special Issue Fabrication of Heterostructure Nanomaterials for Catalysis)
Using solar energy to remove antibiotics from aqueous environments via photocatalysis is highly desirable. In this work, a novel type-II heterojunction photocatalyst, MgSn(OH)6/SnO2, was successfully prepared via a facile one-pot in situ hydrothermal method at 220 °C for 24 h. The obtained heterojunctions were characterized via powder X-ray diffraction, Fourier-transform infrared spectroscopy, transmission electron microscopy, and ultraviolet-visible diffuse reflectance spectroscopy. The photocatalytic performance was evaluated for photodegradation of tetracycline solution under ultraviolet irradiation. The initial concentration of tetracycline solution was set to be 20 mg/L. The prepared heterojunctions exhibited superior photocatalytic activity compared with the parent MgSn(OH)6 and SnO2 compounds. Among them, the obtained MgSn(OH)6/SnO2 heterojunction with MgCl2·6H2O:SnCl4·5H2O = 4:5.2 (mmol) displayed the highest photocatalytic performance and the photodegradation efficiency conversion of 91% could be reached after 60 min under ultraviolet irradiation. The prepared heterojunction maintained its performance after four successive cycles of use. Active species trapping experiments demonstrated that holes were the dominant active species. Hydroxyl radicals and superoxide ions had minor effects on the photocatalytic oxidation of tetracycline. Photoelectrochemical measurements were used to investigate the photocatalytic mechanism. The enhancement of photocatalytic activity could be assigned to the formation of a type-II junction photocatalytic system, which was beneficial for efficient transfer and separation of photogenerated electrons and holes. This research provides an in situ growth strategy for the design of highly efficient photocatalysts for environmental restoration. View Full-Text
Keywords: perovskite-type hydroxide; photocatalysis; tetracycline; photoelectrochemistry; type-II heterojunction perovskite-type hydroxide; photocatalysis; tetracycline; photoelectrochemistry; type-II heterojunction
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MDPI and ACS Style

Li, Y.; Tian, X.; Wang, Y.; Yang, Q.; Diao, Y.; Zhang, B.; Yang, D. In Situ Construction of a MgSn(OH)6 Perovskite/SnO2 Type-II Heterojunction: A Highly Efficient Photocatalyst towards Photodegradation of Tetracycline. Nanomaterials 2020, 10, 53. https://doi.org/10.3390/nano10010053

AMA Style

Li Y, Tian X, Wang Y, Yang Q, Diao Y, Zhang B, Yang D. In Situ Construction of a MgSn(OH)6 Perovskite/SnO2 Type-II Heterojunction: A Highly Efficient Photocatalyst towards Photodegradation of Tetracycline. Nanomaterials. 2020; 10(1):53. https://doi.org/10.3390/nano10010053

Chicago/Turabian Style

Li, Yuanyuan; Tian, Xiaofang; Wang, Yaoqiong; Yang, Qimei; Diao, Yue; Zhang, Bin; Yang, Dingfeng. 2020. "In Situ Construction of a MgSn(OH)6 Perovskite/SnO2 Type-II Heterojunction: A Highly Efficient Photocatalyst towards Photodegradation of Tetracycline" Nanomaterials 10, no. 1: 53. https://doi.org/10.3390/nano10010053

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