A Comparasion of Photocatalytic Activity Between FeS2, Ni-Doped FeS2 Nanoparticles and Un-Doped FeS2/rGO Composite

Abstract

Un-doped and Ni-doped FeS 2 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 FeS 2 NPs fi Ni-doped FeS 2 NPs fi composite of FeS 2 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 ÁOH and ÁO À 2 have shown to be dominant radicals in the visible light MB degradation. The presented data strongly suggest that the composite of FeS 2 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.

Fast Microwave Synthesis of Phase-Pure Ni2FeS4 Thiospinel Nanosheets for Application in Electrochemical CO2 Reduction

“…The high specific surface area of 80 m 2 g –1 obtained from BET (Brunauer–Emmett–Teller) analysis further demonstrates the assembled, nanostructured morphology of synthesized Ni 2 FeS 4 nanosheets resulting in voids between the sheets. The specific surface area is quite remarkable for a Ni–Fe–S material with a high density of 4.65 cm 3 g –1 , which is underlined by the comparison with Ni 0.7 Fe 0.3 S 2 microflowers (11 m 2 g –1 ) and Ni-doped FeS 2 nanoparticles (26 m 2 g –1 ) …”

“…The specific surface area is quite remarkable for a Ni−Fe−S material with a high density of 4.65 cm 3 g −1 , which is underlined by the comparison with Ni 0.7 Fe 0.3 S 2 microflowers (11 m 2 g −1 ) 21 and Ni-doped FeS 2 nanoparticles (26 m 2 g −1 ). 22 These are very important features since the performance of an electrocatalyst can be controlled by tuning size, composition, morphology, and architecture of applied materials. 23 Nanostructuring can be beneficial, as it increases the volume to bulk ratio and thus the number of active surface sites.…”

Ar plasma assists in enhanced oxygen evolution kinetics of MOG-derived multicomponent transition metal sulfides

“…31 Furthermore, the peaks near 376 and 465 cm −1 could be ascribed to the in-phase stretching vibration of the S–S pair in CoS 2 , FeS 2 , and Ni 7 S 6 respectively. 32–34…”

“…vibration of the S-S pair in CoS 2 , FeS 2 , and Ni 7 S 6 respectively. [32][33][34] EPR measurements were employed to investigate the sulfur vacancy concentration. The distinct EPR signal peak located at g = 2.004 (Fig.…”