Degradation of Tannic Acid Using TiO₂ Nanotubes as Electrocatalyst

Abstract

Structured TiO 2 nanotubes were grown on 2 mm thick titanium sheet by anodization of titanium in ethylene glycol medium containing 0.025 M NaF. The morphology of TiO 2 nanotubes (TNT) was characterized using field emission scanning electron microscope. The potential of TNT as anode and also as photocatalyst for the degradation of tannic acid was studied. The mineralization of tannic acid was measured in terms Total Organic Carbon (TOC). Only 50% of TOC could be removed by exposing the tannic acid solution to UV-radiation (photolysis), whereas it was improved to 70% by electrooxidation (EO) using TNT as anode. Maximum degradation of 83% was achieved when electrooxidation was conducted under the influence of UVradiation (photoelectrocatalytic process (PEC)). Among the electrolytes tried, Na 2 SO 4 was observed to be very effective for the degradation of tannic acid. The kinetics of tannic acid degradation by photoelectrocatalytic process was found to follow zero-order rate expression.

Fluorescent carbon nanodots for sensitive and selective detection of tannic acid in wines

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Assessing the effect of different natural dissolved organic matters on the cytotoxicity of titanium dioxide nanoparticles with bacteria

“…As aquatic systems serve as the primary sink for the released nanomaterials (Gao et al, 2009), it is therefore necessary to understand the fate and ecological effects of these nanomaterials in natural aquatic environments (Dasari and Hwang, 2013;He et al, 2014). It has been reported that both HA (Wiszniowski et al, 2002) and TA (Kruthika et al, 2014) could be degraded by TiO 2 NPs.…”

Photocatalysis degradation of Azo dye using nanoTiO 2 ‐coated porous cellulose gel: enhancement by adsorption and its self‐clean characteristic

“…As a semiconductor photocatalyst, nanoTiO 2 has been the object of intensive studies for decades. [10][11][12]. Owing to its excellent photocatalytic activity, chemical and biological inertness and low cost [13,14], TiO 2 has been used as an ideal photocatalyst in treating several kinds of toxically organic compounds in wastewater [15,16].…”