Journal
APPLIED SURFACE SCIENCE
Volume 563, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.150262
Keywords
Ni-ZnS/g-C3N4 nanocomposites; Heterogeneous photocatalysis; Organic pollutants degradation; Visible-light-active photocatalyst
Categories
Funding
- Science and Engineering Research Board, Government of India [CRG/2019/001370]
- DST
- CSIR
- UGC
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This study synthesized a series of Ni-ZnS/g-C3N4 nanocomposites, showing high photocatalytic degradation efficiency of RhB, MB, and paracetamol under visible light without toxic by-products. The establishment of an electron transfer mechanism highlights the importance of separating charge carriers for effective pollutant degradation.
In this paper, a series of nanocomposites consisting of different weight percentages of nickel-doped ZnS (Ni-ZnS)/graphitic-C3N4 (g-C3N4) have been synthesized via solid-state calcination of a mixture of pure g-C3N4 and 10 mol % Ni-ZnS. The proposed solid-state method is simple and provides a general route to make composite photocatalysts on a large scale. The shift in XRD peaks to lower theta value validates Ni+2 ion could be introduced effectually into the lattice of ZnS and substitutes to Zn+2 site. The interaction between Ni-ZnS and g-C3N4 in composite materials leads to long-lived charge carriers and efficient visible-light harvesting property. Which in turn showed remarkable high activity for degradation of RhB (92%, in 75 min), MB (96%, in 40 min) and paracetamol (86%, in 100 min), respectively. The photo mineralization of RhB, MB and paracetamol, over the most active 10 wt% Ni-ZnS/g-C3N4 nanocomposite was also evaluated by monitoring the reduction in TOC (total organic carbon) contents with respect to time under the visible light source. High-performance liquid chromatography results showed that no toxic by-products were formed during the photodegradation of paracetamol. On the basis of obtained results, a conceivable electron transfer mechanism has been stretched out for separating charge carriers and emphasizes the importance of superoxide and hydroxyl radicals for the degradation of pollutants in wastewater.
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