Degradation of Minocycline by the Adsorption–Catalysis Multifunctional PVDF–PVP–TiO 2 Membrane: Degradation Kinetics, Photocatalytic Efficiency, and Toxicity of Products

Chengzhi Zhou, Yanlong Sun, Fan Zhang and Yuandong Wu
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Chengzhi Zhou: Qingdao Engineering Research Center for Rural Environment, College of Resource and Environment, Qingdao Agricultural University, Qingdao 266109, China
Yanlong Sun: College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
Fan Zhang: School of Electrical and Information Technology, Yunnan Minzu University, Kunming 650031, China
Yuandong Wu: Shenzhen Institute, Peking University, Shenzhen 518000, China

IJERPH, 2021, vol. 18, issue 23, 1-13

Abstract: The photocatalytic degradation of minocycline was studied by using polyvinylidene fluoride–polyvinylpyrrolidone–TiO 2 (PVDF–PVP–TiO 2 ) fiber mats prepared by an electrospinning technology. The influences of the TiO 2 dosage, minocycline concentrations, inorganic anions, pH values, and dissolved organic matter (DOM) concentrations on the degradation kinetics were investigated. A mass of 97% minocycline was degraded in 45 min at 5% TiO 2 dosage. The corresponding decomposition rate constant was 0.069 min −1 . The inorganic anions affected the minocycline decomposition in the order of HCO 3 − > Cl − > SO 4 2− > NO 3 − , which was confirmed by the results of electron spin resonance (ESR) spectra. The lowest electrical energy per order ( E EO ) was 6.5 Wh/L. Over five cycles, there was no change in the photocatalytic performance of the degrading minocycline. Those investigations suggested that effective degradation of minocycline could be reached in the PVDF–PVP–TiO 2 fiber mats with a low energy consumption, good separation and, good recovery. Three photocatalytic decomposition pathways of minocycline were proposed: (i) hydroxyl substitution of the acylamino group; (ii) hydroxyl substitution of the amide group, and (iii) a cleavage of the methyl groups and further oxidation of the amino group by OH. Potential risks caused by TP159 and TP99 should not be ignored, while the TP90 are nontoxic. Tests indicated that the toxicity of the photocatalytic process may be persistent if minocycline and its products were not mineralized completely.

Keywords: electrospinning; minocycline; photocatalytic oxidation; PVDF–PVP–TiO 2 fiber mats; degradation mechanism (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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