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Optimal Hydrogen Production Coupled with Pollutant Removal from Biodiesel Wastewater Using a Thermally Treated TiO(2) Photocatalyst (P25): Influence of the Operating Conditions
This work aimed to produce hydrogen (H(2)) simultaneously with pollutant removal from biodiesel wastewater by photocatalytic oxidation using a thermally-treated commercial titanium dioxide (TiO(2)) photocatalyst at room temperature (~30 °C) and ambient pressure. The effects of the operating conditio...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5853727/ https://www.ncbi.nlm.nih.gov/pubmed/29425142 http://dx.doi.org/10.3390/nano8020096 |
Sumario: | This work aimed to produce hydrogen (H(2)) simultaneously with pollutant removal from biodiesel wastewater by photocatalytic oxidation using a thermally-treated commercial titanium dioxide (TiO(2)) photocatalyst at room temperature (~30 °C) and ambient pressure. The effects of the operating conditions, including the catalyst loading level (1–6 g/L), UV light intensity (3.52–6.64 mW/cm(2)), initial pH of the wastewater (2.3–8.0) and reaction time (1–4 h), on the quantity of H(2) production together with the reduction in the chemical oxygen demand (COD), biological oxygen demand (BOD) and oil and grease levels were explored. It was found that all the investigated parameters affected the level of H(2) production and pollutant removal. The optimum operating condition for simultaneous H(2) production and pollutant removal was found at an initial wastewater pH of 6.0, a catalyst dosage of 4.0 g/L, a UV light intensity of 4.79 mW/cm(2) and a reaction time of 2 h. These conditions led to the production of 228 μmol H(2) with a light conversion efficiency of 6.78% and reduced the COD, BOD and oil and grease levels by 13.2%, 89.6% and 67.7%, respectively. The rate of pollutant removal followed a pseudo-first order chemical reaction with a rate constant of 0.008, 0.085 and 0.044 min(−1) for the COD, BOD and oil and grease removal, respectively. |
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