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1D/2D MnWO4 nanorods anchored on g-C3N4 nanosheets for enhanced photocatalytic degradation ofloxacin under visible light irradiation

Author:
Lakshmi Prabavathi S., Saravanakumar K., Gcina Mamba, Muthuraj V.
Source:
Colloids and surfaces 2019 v.581 pp. 123845
ISSN:
0927-7757
Subject:
Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, anions, carbon nitride, carbonates, catalysts, chemical composition, chlorides, energy-dispersive X-ray analysis, hot water treatment, irradiation, light, nanocomposites, nanorods, nanosheets, ofloxacin, optical properties, photocatalysis, pollutants, pollution control, scanning electron microscopy, sulfates, transmission electron microscopy, ultrasonic treatment
Abstract:
Herein, MnWO₄ nanorods coupled with g-C₃N₄ nanosheets were fabricated by a simple hydrothermal method, followed by an ultrasonication method. Morphological features, chemical composition, optical properties and crystallographic information of the prepared materials were obtained using SEM-EDX, TEM, XRD, XPS, FT-IR, UV–vis DRS, and PL techniques. The synthesized MnWO₄@g-C₃N₄ nanocomposite displayed excellent photocatalytic activity towards ofloxacin (OFX) under visible light irradiation. Moreover, the influence of reaction parameters such as the catalyst dosage, pollutant concentration and presence of inorganic anions (Cl⁻, CO₃₂₋ ₐₙd SO₄₂⁻), was investigated during the photocatalytic process. Notably, among the inorganic anions, SO₄²⁻ and CO₃₂⁻ significantly hampered OFX degradation, while Cl⁻ ions showed minimal effect on the degradation process. The apparent rate constant for MnWO₄@g-C₃N₄ from first order kinetics was 3.5 and 4.8 times higher than that of pure g-C₃N₄ and MnWO₄, respectively. Based on the obtained results, the possible charge transfer mechanism was proposed. The enhanced photocatalytic performance of the binary nanocomposite could be ascribed to the synergistic effect between MnWO₄ nanorods and g-C₃N₄ nanosheets resulting in efficient visible light utilization and inhibition of the charge carrier recombination. This work demonstrates the potential application of MnWO₄@g-C₃N₄ nanostructures in the photocatalytic removal of emerging pollutants in water.
Agid:
6616297