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Photocatalytic degradation of pollutants from Elcogas IGCC power station effluents.
J Hazard Mater. 2007 Jun 01; 144(1-2):132-9.JH

Abstract

The aim of this work is to improve the quality of water effluents coming from Elcogas IGCC power station (Puertollano, Spain) with the purpose of fulfilling future more demanding normative, using heterogeneous photocatalytic oxidation processes (UV/H(2)O(2)/TiO(2) or ZnO). The efficiency of photocatalytic degradation for the different catalysts (TiO(2) and ZnO) was determined from the analysis of the following parameters: cyanides, formates and ammonia content. In a first stage, the influence of two parameters (initial concentration of H(2)O(2) and amount of catalyst) on the degradation kinetics of cyanides and formates was studied based on a factorial experimental design. pH was always kept in a value >9.5 to avoid gaseous HCN formation. The degradation of cyanides and formates was found to follow pseudo-first order kinetics. Experimental kinetic constants were fitted using neural networks (NNs). The mathematical model reproduces experimental data within 90% of confidence and allows the simulation of the process for any value of parameters in the experimental range studied. Moreover, a measure of the saliency of the input variables was made based upon the connection weights of the neural networks, allowing the analysis of the relative relevance of each variable with respect to the others. Results showed that the photocatalytic process was effective, being the degradation rate of cyanides about five times higher when compared to removal of formates. Finally, the effect of lowering pH on the degradation of formates was evaluated after complete cyanides destruction was reached (10 min of reaction). Under the optimum conditions (pH 5.2, [H(2)O(2)]=40 g/l; [TiO(2)]=2g/l), 100% of cyanides and 92% of initial NH(3) concentration are degraded after 10 min, whereas 35 min are needed to degrade 98% of formates.

Authors+Show Affiliations

Department of Chemical Engineering, Escuela Técnica Superior de Ingenieros Industriales, University of Castilla-La Mancha, Avda. Camilo José Cela 3, 13071 Ciudad Real, Spain. Antonio.Duran@uclm.esNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17118539

Citation

Durán, A, et al. "Photocatalytic Degradation of Pollutants From Elcogas IGCC Power Station Effluents." Journal of Hazardous Materials, vol. 144, no. 1-2, 2007, pp. 132-9.
Durán A, Monteagudo JM, San Martín I, et al. Photocatalytic degradation of pollutants from Elcogas IGCC power station effluents. J Hazard Mater. 2007;144(1-2):132-9.
Durán, A., Monteagudo, J. M., San Martín, I., García-Peña, F., & Coca, P. (2007). Photocatalytic degradation of pollutants from Elcogas IGCC power station effluents. Journal of Hazardous Materials, 144(1-2), 132-9.
Durán A, et al. Photocatalytic Degradation of Pollutants From Elcogas IGCC Power Station Effluents. J Hazard Mater. 2007 Jun 1;144(1-2):132-9. PubMed PMID: 17118539.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Photocatalytic degradation of pollutants from Elcogas IGCC power station effluents. AU - Durán,A, AU - Monteagudo,J M, AU - San Martín,I, AU - García-Peña,F, AU - Coca,P, Y1 - 2006/10/11/ PY - 2006/07/10/received PY - 2006/10/03/revised PY - 2006/10/03/accepted PY - 2006/11/23/pubmed PY - 2007/8/31/medline PY - 2006/11/23/entrez SP - 132 EP - 9 JF - Journal of hazardous materials JO - J Hazard Mater VL - 144 IS - 1-2 N2 - The aim of this work is to improve the quality of water effluents coming from Elcogas IGCC power station (Puertollano, Spain) with the purpose of fulfilling future more demanding normative, using heterogeneous photocatalytic oxidation processes (UV/H(2)O(2)/TiO(2) or ZnO). The efficiency of photocatalytic degradation for the different catalysts (TiO(2) and ZnO) was determined from the analysis of the following parameters: cyanides, formates and ammonia content. In a first stage, the influence of two parameters (initial concentration of H(2)O(2) and amount of catalyst) on the degradation kinetics of cyanides and formates was studied based on a factorial experimental design. pH was always kept in a value >9.5 to avoid gaseous HCN formation. The degradation of cyanides and formates was found to follow pseudo-first order kinetics. Experimental kinetic constants were fitted using neural networks (NNs). The mathematical model reproduces experimental data within 90% of confidence and allows the simulation of the process for any value of parameters in the experimental range studied. Moreover, a measure of the saliency of the input variables was made based upon the connection weights of the neural networks, allowing the analysis of the relative relevance of each variable with respect to the others. Results showed that the photocatalytic process was effective, being the degradation rate of cyanides about five times higher when compared to removal of formates. Finally, the effect of lowering pH on the degradation of formates was evaluated after complete cyanides destruction was reached (10 min of reaction). Under the optimum conditions (pH 5.2, [H(2)O(2)]=40 g/l; [TiO(2)]=2g/l), 100% of cyanides and 92% of initial NH(3) concentration are degraded after 10 min, whereas 35 min are needed to degrade 98% of formates. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/17118539/Photocatalytic_degradation_of_pollutants_from_Elcogas_IGCC_power_station_effluents_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(06)01194-0 DB - PRIME DP - Unbound Medicine ER -