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  • Photoregenerable, Bifunctional Granules of Carbon Doped g‑C3N4 as Adsorptive Photocatalyst for the Efficient Removal of Tetracycline Antibiotic

Photoregenerable, Bifunctional Granules of Carbon Doped g‑C3N4 as Adsorptive Photocatalyst for the Efficient Removal of Tetracycline Antibiotic

Suyana Panneri, Priyanka Ganguly, Midhun Mohan, Balagopal N. Nair, Abdul Azeez Peer Mohamed, Krishna G. Warrier, and U.S. Hareesh*

Environmental remediation employing semiconducting materials offer a greener solution for pollution control. Herein, we report the development of high surface area porous architecture of C3N4 nanosheets by a simple aqueous spray drying process. g-C3N4nanosheets obtained by the thermal decomposition of urea-thiourea mixture are spray granulated to microspheres using 2 wt % poly vinyl alcohol (PVA) as binder. The post granulation thermal oxidation treatment resulted in insitu doping of carbon leading to improved photophysical properties compared to pristine g-C3N4. The C3N4 granules with surface area values of 150 m2/g rendered repetitive adsorption of tetracycline antibiotic (∼75 % in 60 min) and the extended absorption in the visible region facilitated complete photocatalytic degradation upon sunlight irradiation (>95 % in 90 min). The delocalized π bonds generated after carbon doping and the macro-meso porous architecture created by the granulation process aided high adsorption capacity (70 mg/g). The photoregenerable, bifunctional materials herein obtained can thus be employed for the adsorption and subsequent degradation of harmful organic pollutants without any secondary remediation processes.

ACS Sustainable Chem. Eng., 2017, 5 (2), pp 1610–1618

http://pubs.acs.org/doi/abs/10.1021/acssuschemeng.6b02383

DOI: 10.1021/acssuschemeng.6b02383