Photocatalytic Degradation of Malachite Green Dye Using Zinc Sulfide Nanostructures

Abstract

Zinc Sulfide (ZnS) get important attention as a semiconductor photocatalyst among other transition metal sulfides due to its fascinating and extraordinary properties. Here ZnS nanoparticles are synthesized by hydrothermal method using zinc acetate and sodium sulfide as precursors. The structural properties of ZnS was studied by using X‐Ray Diffraction technique (XRD).Exact fitting and crystal information of the sample was obtained from Rietveld refinement with Crystallographic Open Database (COD). It shows that ZnS follows cubic structure without any impurity peaks. Crystallite size and lattice strain values are calculated by using Williamson‐Hall (W−H) Plot method. As temperature increases, the particle size also going to increases due to atomic diffusion phenomena. Tauc plot indicates that the bandgap values decreases with increasing temperature. Accurate determination of bandgap values was analyzed by Boltzmann fitting using sigmoid function. Chemical states of elements were obtained with X‐ray Photoelectron Spectroscopy (XPS).Surface morphology and elemental analysis of ZnS nanoparticles was determined from Field Emission Scanning Electron Spectroscopy (FESEM) and Energy Dispersive spectroscopy (EDS). Then the photocatalytic dye degradation efficiency of synthesized particles for Malachite Green (MG) dye was evaluated. From the studies it was found that ZnS is an efficient photocatalyst and it can be used as a perfect future material to avoid the water pollution.

Experimental and Theoretical Investigation of Degradation Activity of Layered Two-Dimensional MoS2-ZnS Nanocomposites

“…The solution was stirred well in 50 ml deionized water for 1-2 h. Then the uniformly dispersed solution was transferred to a Teflon lined autoclave in a hydrothermal oven kept at 180 °C for 24 h. After natural cooling, the black colored precipitate was filtered, washed well with deionized water and ethanol and dried in an oven at 60 °C for 12 h. Synthesis of ZnS nanostructures.-ZnS nanostructures have been prepared as described in our previous work using zinc acetate and sodium sulfide. 11 The hydrothermal method was executed at 150 °C for 2 h. Synthesis of MoS 2 -ZnS nanocomposite.-The prepared MoS 2 and ZnS nanoparticles have been dissolved in 50 ml deionized water with ratios of 1:0.5 (in wt%) (this sample is hereby labelled as MoS 2 -ZnS) and 1:0.75 (in wt%) (this sample is hereby labelled as MZ). Then we followed the same procedure for the synthesis of individual MoS 2 and ZnS with the hydrothermal condition at 150 °C for 4 to 6 h.…”

Hydrothermal Synthesis and Photocatalytic Activity of NiTiO3 for the Degradation of Malachite Green under Visible Light Irradiation

“…Since the photodegradation mechanism is sensitive to various operational factors, a standard methodology based on the one‐factor‐at‐a‐time strategy OFAT was successfully applied to optimize the degradation process To properly remove this dye from the contained water, five parameters were selected, including the medium pH, the amount of catalyst ($${{{\rm \ }{\rm N}{\rm i}{\rm T}{\rm i}{\rm O}}_{3})}$$ , the irradiation time, the solution temperature, and the initial dye concentration. The optimal conditions can be determined by examining the effects of each factor on the photocatalytic efficiency [32] . In addition, three catalyst recoveries and regenerations were carried out to investigate its stability.…”

“…The optimal conditions can be determined by examining the effects of each factor on the photocatalytic efficiency. [32] In addition, three catalyst recoveries and regenerations were carried out to investigate its stability.…”

Electron beam deposited (Cu2S‐CdS)GOthin film as active electrode for supercapacitor and enhanced photocatalyst for water remediation

“…13,14 The sp 2 hybridized carbon atoms in GO have conducting π-states, which are separated by the sp 3 C atoms with σ-states by large energy gaps. 15 The sp 2 and sp 3 hybridized C atoms provide liberty to modify the GO properties. The carbon and oxygen stoichiometric ratio of functional groups on GO surface displayed it as a semiconductor with bandgap tunability ability.…”

“…These inorganic materials largely attract researchers globally. The semiconductor transition metals have gained tremendous attention in multiple domains due to their underlying intriguing characteristics 2 . These particles display size‐dependent properties.…”