Facile Green Synthesis of Ag@g-C 3 N 4 for Enhanced Photocatalytic and Catalytic Degradation of Organic Pollutant
- PDF / 1,654,479 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 91 Downloads / 220 Views
(0123456789().,-volV)(0123456789(). ,- volV)
ORIGINAL PAPER
Facile Green Synthesis of Ag@g-C3N4 for Enhanced Photocatalytic and Catalytic Degradation of Organic Pollutant Saran Sarangapany1 • Kaustubha Mohanty1,2 Received: 22 February 2020 Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A simple and easy green synthesis of silver nanoparticles (Ag NPs) was prepared using Sapindus emarginatus stem bark extract and anchored over graphitic carbon nitride (g-C3N4) surface. The synthesized materials characterized by UV– Visible, XRD, FESEM, FETEM, FT-IR and Raman spectroscopy ensured the development of Ag NPs anchored over the g-C3N4 surface. The prepared catalyst was utilized for Methylene Blue (MB) dye degradation through visible light photocatalysis. The optimization of operational parameters, like the effect of catalyst dosage, H2O2 concentration and slurry pH, was performed. The results exhibited that compared to pristine g-C3N4, photocatalytic efficacy was enhanced two-fold in Ag@g-C3N4. Also, the prepared Ag@g-C3N4 showed a faster catalytic MB dye reduction (25 s) in the presence of NaBH4. The catalyst was recovered from the reaction solution by centrifugation and reused for five consecutive cycles. The results showed that there was no significant loss in the efficiency of the catalyst. These results confirmed that the green synthesized Ag@g-C3N4 is likely advantageous for organic pollutants degradation. Keywords Green synthesis Silver nanoparticles Photocatalysis Visible light Organic pollutants
Introduction Presence of toxic organic compound in water is a severe threat to global human health. Photocatalytic mediated degradation of those harmful recalcitrant organic compound is becoming a promising treatment method [1]. Photocatalyst such as TiO2, ZnO, CdS, WO and C3N4 have been employed for organic compounds degradation previously. Among them, graphitic carbon nitride (g-C3N4) mediated photocatalysis is gaining significant consideration because it has narrow bandgap, low cost, high stability and non-toxicity. However, due to its higher electron (e-) and hole (h?) recombination rate and lower utilization of Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10876-020-01816-5) contains supplementary material, which is available to authorized users. & Kaustubha Mohanty [email protected] 1
Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati 781039, India
2
Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India
visible light, limits it practical photocatalytic applications [2]. These limitations can be overcome by anchoring with noble metal nanoparticles such as Au, Pt, Pd and Ag, which traps the photogenerated electron and also enhances the visible light utilization [3]. Among these noble metals, silver is gaining much attention due to facile synthesis, tuning its size, shape and morphology, cost-effective when compared to other noble metals and activate
Data Loading...
