Journal
WATER SCIENCE AND TECHNOLOGY
Volume 79, Issue 5, Pages 905-910Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2018.493
Keywords
chemical oxidation; green chemistry; nanoparticles; paraquat; TiO2; water treatment
Funding
- National Research Council, Thailand (NRCT) through Naresuan University [R2562B021]
- Thailand Research Fund [BRG6180009]
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The TiO2 nanoparticles synthesized from the extract of Coffea arabica L. (or TiO2/C) were used to remove paraquat from contaminated water in heterogeneous photocatalysis process. In this work, the sol-gel process using Coffea arabica L. as the solvent chemical were performed to obtain the TiO2 nano-catalyst. The value of pH(pzc) of TiO2/C was 2.9 which caused a highly acidic surface of catalyst. The paraquat is effectively removed in alkaline medium due to the adsorption ability of paraquat on the surface of TiO2/C. The paraquat degradation followed the pseudo-first-order model with the apparent rate constants of 5.84 x 10(-2), 4.08 x 10(-2), and 2.28 x 10(-2) min(-1) for TiO2/C, TiO2, and without TiO2, respectively, under the presence of ultraviolet (UV) and H2O2. The combined TiO2/C with UV and H2O2 was the most efficient process, exhibiting a maximum 66.3% degradation of 50 mg/L over 90 min at pH 10.
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