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Issue 48, 2018
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Enhanced photochemical activity and stability of ZnS by a simple alkaline treatment approach

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Abstract

In this study, a simple alkaline treatment method is developed to greatly improve the photochemical properties of ZnS. It is found that after treating ZnS with NaOH solution, the obtained sample (3 M-ZnS) has a larger pore size (12.5 nm) and a larger BET area (51.2 m2 g−1), compared with untreated ZnS (3.8 nm, 27.6 m2 g−1, respectively). Moreover, alkaline treatment also increases zinc vacancies (VZn), which up-shift the conduction band (CB) and down shift the valence band (VB) positions. VZn causes a defect energy level above the VB of ZnS, thus causing additional light absorption; it can also act as a trap for the photogenerated holes. VZn not only improves the charge separation efficiency, but also reduces the oxidative ability of holes. Compared with untreated ZnS, the degradation activity of 3 M-ZnS increases by 55% for MB dye in wastewater after 40 minutes of UV light irradiation (λ ≤ 420 nm); most importantly, the resistance to photocorrosion of 3 M-ZnS increases by 210% compared with that of untreated ZnS. This low-cost strategy could be used for the mass production of efficient photocatalysts, which can be used for dye cleanup from wastewater.

Graphical abstract: Enhanced photochemical activity and stability of ZnS by a simple alkaline treatment approach

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Publication details

The article was received on 22 Aug 2018, accepted on 10 Nov 2018 and first published on 12 Nov 2018


Article type: Paper
DOI: 10.1039/C8CE01417E
Citation: CrystEngComm, 2018,20, 7866-7879
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    Enhanced photochemical activity and stability of ZnS by a simple alkaline treatment approach

    Z. Ul Abideen and F. Teng, CrystEngComm, 2018, 20, 7866
    DOI: 10.1039/C8CE01417E

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