期刊
SOLAR ENERGY
卷 84, 期 2, 页码 345-351出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2009.12.005
关键词
Photocatalysis; TiO2; Degradation/mineralization; Water treatment; Organics contaminants; Pilot-plant scale
资金
- Laboratorio de Sisternas de Desarrollo Modelos y Prototipos [5152-07]
Photodegradation/mineralization (TiO2/UV Light) of the hydrocarbons:p-nitrophenol (PNP), naphthalene (NP) and dibenzothiophene (DBT) at three different reactors: batch bench reactor (BBR), tubular bench reactor (TBR) and tubular pilot-plant (TPP) were kinetically monitored at pH = 3, 6 and 10, and the results compared using normalized UV light exposition times. The results fit the Langmuir-Hinshelwood (LH) model; therefore, LH adsorption equilibrium constants (K) and apparent rate constants (k) are reported as well as the apparent pseudo-first-order rate constants, k(obs)' = kK/(1 + Kc(r)). The batch bench reactor is the most selective reactor toward compound and pH changes in which the reactivity order is: NP > DBT > PNP, however, the catalyst adsorption (K) order is: DBT > NP > PNP at the three pH used but NP has the highest k values. The tubular pilot-plant (TPP) is the most efficient of the three reactors tested. Compound and pH photodegradation/mineralization selectivity is partially lost at the pilot plant where DBT and NP reaches ca. 90% mineralization at the pH used, meanwhile, PNP reaches only 40%. The real time, in which these mineralization occur are: 180 min for PNP and 60 min for NP and DBT. The mineralization results at the TPP indicate that for the three compounds, the rate limiting step is the same as the degradation one. So that, there is not any stable intermediate that may accumulate during the photocatalytic treatment. (C) 2009 Elsevier Ltd. All rights reserved.
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