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Visible-Light-Induced Degradation of Rhodamine B by Nanosized Ag2S-ZnS Loaded on Cellulose

Abstract

In the present work, new visible light active nanosized Ag2S-ZnS loaded on cellulose (AZCE) was synthesized by precipitation method. The AZCE composite was systematically characterized by powder X-ray diffraction (XRD), scanning electron microscope (SEM), Transmission electron microscope (TEM), Brunauer-Emmett-Teller (BET) surface area, and UV-visible diffuse reflectance spectra (UV-DRS). Activity of the photocatalysts was evaluated for rhodamine B dye (RhB) degradation under simulated sun light and the amount of dye samples were analysed using a UV–vis spectrophotometer at λmax 554 nm. Effect of reaction conditions such as pH, catalyst, hydrogen peroxide and dye concentration on the photodegradation rate have been investigated. The degrdation profile reveals that 30 ppm of dye can be effectively oxidized by using 30 mg of AZCE dose in the pH region 4-12 within 90 min. The oxidation of RhB dye follows first-order kinetics and rate constant was found to be 6.4x10-3 min-1. Various organic intermediates were identified during degrdation by high performance liquid chromatography (HPLC), total organic contents (TOC) and electron-spray ionization-mass spectrometric (ESI-MS). In order to effectivenss of AZCE photocatlytic activity, other catalysts such as Ag2S loaded on cellulose (AZE) and ZnS loaded on cellulose (ZCE) were used as photocatlysts. The results shows that photocatlytic activirty follows AZCE˃ACE˃ZCE and this is due to cellulose network as catlyst carrier. The alkali pre-treated cellulose provide an activated surface hydroxyl groups to enhance the deposition efficiency of Ag2S and ZnS there by large amount of visible light can absorb and increases photocatalytic activity.

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Supplementary files

Publication details

The article was received on 22 Jul 2018, accepted on 05 Oct 2018 and first published on 08 Oct 2018


Article type: Paper
DOI: 10.1039/C8PP00330K
Citation: Photochem. Photobiol. Sci., 2018, Accepted Manuscript
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    Visible-Light-Induced Degradation of Rhodamine B by Nanosized Ag2S-ZnS Loaded on Cellulose

    A. S.K. Kumar and P. kumar, Photochem. Photobiol. Sci., 2018, Accepted Manuscript , DOI: 10.1039/C8PP00330K

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