Kier Gasga

Scopus Publications

Photocatalytic degradation of phenol using immobilized titania in activated carbon from Canarium ovatum Engl. nut shell
K Gasga, N Rebuya, and E Lasarte
IOP Publishing
Abstract Presented study determined the photocatalytic treatment of phenol in aqueous medium using titania (TiO2) immobilized in activated carbon derived from charred Canarium ovatum Engl. nut shell through boil deposition method. Composite dosage, irradiation time, initial phenol concentration, and pH were varied to investigate how percent degradation of phenol would respond. The investigation showed that amongst all parameters, only pH has a significant effect to the photocatalytic degradation of phenol, wherein degradation increases as pH value decreases. Moreover, Design Expert® showed that 90.437% phenol degradation will be achieved using optimum values.

Dye and activated carbon from Canarium ovatum Engl. as photosensitizer and counter electrode for Titania-based dye sensitized solar cell
K Gasga
IOP Publishing
Abstract Natural dye from exocarp and activated carbon from charred shells of Canarium ovatum Engl nut was used in the fabrication of dye sensitized solar cell (DSSC). Anatase titania (titanium dioxide, TiO2) nanoparticles was used as semiconducting layer deposited on a transparent conductive indium tin oxide glass using doctor blade method. TiO2 film thickness and soaking time in dye were varied to show response in terms of fill factor (FF), short circuit current density (Jsc), open circuit photovoltage (Voc), and conversion efficiency (η). In a 2.0 cm2 active surface area tested under solar irradiance, assembled DSSC at optimum conditions garnered 0.768 desirability with FF, Jsc, Voc and n values of 0.601, 6.293 mA/cm2, 0.446 V, and 1.792, respectively.