A Comparasion of Photocatalytic Activity Between FeS 2 , Ni-Doped FeS 2 Nanoparticles and Un-Doped FeS 2 /rGO Composite
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https://doi.org/10.1007/s11664-020-08422-1 2020 The Minerals, Metals & Materials Society
A Comparasion of Photocatalytic Activity Between FeS2, Ni-Doped FeS2 Nanoparticles and Un-Doped FeS2/rGO Composite HONG QUANG NGUYEN,1 THI HONG TUYET PHAN,1 DINH QUANG HO,1 HOA DU NGUYEN,1 THE TAM LE,1 THI MINH NGUYEN,1 VAN THINH PHAM,2 NGOC HUYEN DUONG,3 and THI QUYNH HOA NGUYEN 1,4 1.—Vinh University, 182 Le Duan, Vinh, Vietnam. 2.—NTT Hi-Tech Institute, Nguyen Tat Thanh University, Ho Chi Minh, Vietnam. 3.—Hanoi University of Technology, 1 Dai Co Viet, Hanoi, Vietnam. 4.—e-mail: [email protected]
Un-doped and Ni-doped FeS2 nanoparticles (NPs) with a doping concentration of 4.0 at.% have been synthesized by a solvothermal method. The obtained materials have been characterized by means of XRD, SEM, BET, Raman and UV–VIS spectroscopy. The photocatalytic activity has been evaluated based on degrading methylene blue with thin films of the NPs under UV–VIS light irradiation. An important observation was that the activity increases in the sequence FeS2 NPs fi Ni-doped FeS2 NPs fi composite of FeS2 NPs/rGO. The enhanced energy gap and enlarged surface area, achieved by the Nidoping and adding rGO were considered to be the main reason for the improved photocatalytic activity. Additionally, the mechanism of degradation has been studied using several scavengers. The photo-generated OH and O 2 have shown to be dominant radicals in the visible light MB degradation. The presented data strongly suggest that the composite of FeS2 NPs/rGO may be an efficient heterogeneous photo-catalyst for the degradation of the organic contaminant and water treatment. The proposed film forms of materials are promising for convenient reuse after a low-cost cleaning. Key words: FeS2, Ni-doped FeS2, rGO, photocatalytic activity
INTRODUCTION Metal sulphides have attracted considerable interest due to their promising properties for electronic, optical and optoelectronic applications.1,2 Among them, FeS2 is an abundant, non-toxic and low-cost material with small band gaps (0.95 eV) 3 and high absorption coefficients, which make it suitable for photovoltaics, lithium-ion batteries and hydrogen evolution.4–7 FeS2 was also employed for the photocatalytic degradation of several organic pollutants.8–10 Up to now, FeS2 NPs have been prepared by several methods, such as hot
(Received April 6, 2020; accepted August 14, 2020)
hydrothermal6,10,13–15 and injection,7,8,11,12 solvothermal methods.16,17 Large-scale production of FeS2 NPs can be obtained via both hydrothermal and solvothermal methods. However, compared with solvothermal method, the hydrothermal approach has the disadvantage for improvement of the permissibility and specific area of FeS2 particles owing to the tendency to aggregate and form large particles during the synthesis process.18 Therefore, the large-scale synthesis of high-dispersive FeS2 NPs is still a challenge for strengthening their unique properties. Recently, doping with metal ions such as Fe and Co ions is an efficient way to enhance
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