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Solar TiO2-assisted photocatalytic degradation of IGCC power station effluents using a Fresnel lens.
Chemosphere. 2008 Mar; 71(1):161-7.C

Abstract

The heterogeneous TiO2 assisted photocatalytic degradation of wastewater from a thermoelectric power station under concentrated solar light irradiation using a Fresnel lens has been studied. The efficiency of photocatalytic degradation was determined from the analysis of cyanide and formate removal. Firstly, the influence of the initial concentration of H2O2 and TiO2 on the degradation kinetics of cyanides and formates was studied based on a factorial experimental design. Experimental kinetic constants were fitted using neural networks. Results showed that the photocatalytic process was effective for cyanides destruction (mainly following a molecular mechanism), whereas most of formates (degraded mainly via a radical path) remained unaffected. Finally, to improve formates degradation, the effect of lowering pH on their degradation rate was evaluated after complete cyanide destruction. The photooxidation efficiency of formates reaches a maximum at pH around 5-6. Above pH 6, formate anion is subjected to electrostatic repulsion with the negative surface of TiO2. At pH<4.5, formate adsorption and photon absorption are reduced due to some catalyst agglomeration.

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. josemaria.monteagudo@uclm.esNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18078669

Citation

Monteagudo, J M., et al. "Solar TiO2-assisted Photocatalytic Degradation of IGCC Power Station Effluents Using a Fresnel Lens." Chemosphere, vol. 71, no. 1, 2008, pp. 161-7.
Monteagudo JM, Durán A, Guerra J, et al. Solar TiO2-assisted photocatalytic degradation of IGCC power station effluents using a Fresnel lens. Chemosphere. 2008;71(1):161-7.
Monteagudo, J. M., Durán, A., Guerra, J., García-Peña, F., & Coca, P. (2008). Solar TiO2-assisted photocatalytic degradation of IGCC power station effluents using a Fresnel lens. Chemosphere, 71(1), 161-7.
Monteagudo JM, et al. Solar TiO2-assisted Photocatalytic Degradation of IGCC Power Station Effluents Using a Fresnel Lens. Chemosphere. 2008;71(1):161-7. PubMed PMID: 18078669.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Solar TiO2-assisted photocatalytic degradation of IGCC power station effluents using a Fresnel lens. AU - Monteagudo,J M, AU - Durán,A, AU - Guerra,J, AU - García-Peña,F, AU - Coca,P, Y1 - 2007/12/19/ PY - 2007/10/16/received PY - 2007/10/22/revised PY - 2007/10/23/accepted PY - 2007/12/15/pubmed PY - 2008/6/5/medline PY - 2007/12/15/entrez SP - 161 EP - 7 JF - Chemosphere JO - Chemosphere VL - 71 IS - 1 N2 - The heterogeneous TiO2 assisted photocatalytic degradation of wastewater from a thermoelectric power station under concentrated solar light irradiation using a Fresnel lens has been studied. The efficiency of photocatalytic degradation was determined from the analysis of cyanide and formate removal. Firstly, the influence of the initial concentration of H2O2 and TiO2 on the degradation kinetics of cyanides and formates was studied based on a factorial experimental design. Experimental kinetic constants were fitted using neural networks. Results showed that the photocatalytic process was effective for cyanides destruction (mainly following a molecular mechanism), whereas most of formates (degraded mainly via a radical path) remained unaffected. Finally, to improve formates degradation, the effect of lowering pH on their degradation rate was evaluated after complete cyanide destruction. The photooxidation efficiency of formates reaches a maximum at pH around 5-6. Above pH 6, formate anion is subjected to electrostatic repulsion with the negative surface of TiO2. At pH<4.5, formate adsorption and photon absorption are reduced due to some catalyst agglomeration. SN - 0045-6535 UR - https://www.unboundmedicine.com/medline/citation/18078669/Solar_TiO2_assisted_photocatalytic_degradation_of_IGCC_power_station_effluents_using_a_Fresnel_lens_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(07)01328-8 DB - PRIME DP - Unbound Medicine ER -