© Laser-Enhanced Photocatalytic Degradation Of Organic Pollutants From Water Using ZnO Semiconductor Catalyst Gondal, MA; Sayeed, MN TAYLOR FRANCIS INC, JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES ENVIRONMENTAL ENGINEERING; pp: 70-77; Vol: 43 King Fahd University of Petroleum & Minerals Summary Wastewater contaminated with organic pollutants creates serious environmental problems. Laser induced photocatalysis has been investigated for removal of organic pollutant like phenol from water. The important mechanism for degradation of phenol by UV laser irradiation is redox reactions triggered by semiconductor catalyst in presence of water. In this study the potential of a ZnO semiconductor catalyst has been explored as an effective catalyst for the photodegradation of phenol using a Nd:YAG laser-emitting at 355 nm in UV-radiation in a batch reactor. The influences of different parameters such as catalyst concentration, UV-radiation intensity, and pH on the extent of photo degradation have been investigated. Overall degradation of phenol achieved was 70% after 60 minutes of laser irradiation of 100 ppm phenol solution in water. The reaction rate constant fit a first-order reaction model for phenol degradation and was estimated as min(-1). This study proved that laser induced photocatalytic removal of phenol is highly efficient as compared with the broadband spectral sources such as lamps being applied in majority of setups worldwide. References: *CDC, 1976, DHEW PUBL AKSU Z, 2005, REV PROCESS BIOCH, V40, P997 BEHNAJADY MA, 2006, J HAZARD MATER, V133, P226, DOI Copyright: King Fahd University of Petroleum & Minerals;

© /j.hazmat BERTONCINI C, 2003, CARBON, V41, P1101, DOI /S (03) BRANDT S, 1997, BIOTECHNOL BIOENG, V55, P480 DENIZLI A, 2004, PROCESS BIOCHEM, V39, P2025, DOI /j.procbio DENIZLI A, 2005, BIORESOURCE TECHNOL, V96, P59, DOI /j.biortech GONDAL MA, 2004, APPL CATAL A-GEN, V268, P159, DOI /j.apcata GONDAL MA, 2004, CHEM PHYS LETT, V385, P111, DOI /j.cplett GONDAL MA, 2004, CHEM PHYS LETT, V392, P372, DOI /j.cplett GONDAL MA, 2004, J MOL CATAL A-CHEM, V222, P259, DOI /j.molcata GONDAL MA, 2005, ENERG SOURCE, V27, P1151, DOI / GRZECHULSKA J, 2002, APPL CATAL B-ENVIRON, V36, P HAMEED A, 2004, J MOL CATAL A-CHEM, V219, P109, DOI /j.molcata HAMEED A, 2005, J MOL CATAL A-CHEM, V227, P241, DOI /j.molcata HAMEED A, 2005, J MOL CATAL A-CHEM, V233, P35, DOI /j.molcata HERRMANN JM, 2005, TOP CATAL, V34, P49, DOI /s KAWAGUCHI H, 1993, ENVIRON TECHNOL, V14, P KHALID M, 2004, IND ENG CHEM RES, V43, P5275, DOI /ie LI LS, 2006, J HAZARD MATER, V128, P145, DOI /j.jhazmat LING CM, 2004, CHEMOSPHERE, V57, P547, DOI /j.chemosphere MACHADO AEH, 2003, J PHOTOCH PHOTOBIO A, V155, P MINSKER KS, 2001, THEOR FOUND CHEM ENG, V35, P MUNAF E, 1997, ENVIRON TECHNOL, V18, P OKUYA M, 2002, SOL ENERG MAT SOL C, V70, P OLLIS DF, 1991, ENVIRON SCI TECHNOL, V25, P SAKTHIVEL S, 2002, J PHOTOCH PHOTOBIO A, V148, P SALAICES M, 2004, CHEM ENG SCI, V59, P3, DOI /j.ces SCHIAVELLO M, 1987, NATO ASI SER C-MATH, P SENEL S, 2006, J HAZARD MATER, V138, P317, DOI /j.jhazmat Copyright: King Fahd University of Petroleum & Minerals;

© SLEIN MW, 1980, DEGRADATION CHEM CAR YAHAYA H, 2004, CHEM PHYS LETT, V400, P206 YUN CY, 2002, APPL SURF SCI, V200, P239 ZHAN HQ, 1998, DYES PIGMENTS, V37, P231 For pre-prints please write to: Copyright: King Fahd University of Petroleum & Minerals;