TY - JOUR
T1 - Novel catalytic photochemical and hydrothermal treatment processes for acid dye wastewater
AU - Arslan-Alaton, Idil
PY - 2003
Y1 - 2003
N2 - The purpose of the present study was to evaluate the catalytic effect of a heteropoly acid, namely H4SiW12O40, on aqueous Acid Orange 7, a well-known, representative textile monoazo dye applied to nylon fabrics, in sub-critical water (T=160°C-290°C; P=0.6-3.0 MPa, pH=2.6) and under near-UV-VIS light irradiation (isopropanol: water ratio=1:10; pH=2.8). SiW12O404--catalyzed photochemical Acid Orange 7 bleaching was also explored in the presence of two dye assisting chemicals as well as in simulated acid dye wastewater at its natural, acidic pH under otherwise identical reaction conditions. Though less explored than TiO2-mediated, heterogeneous photocatalytic treatment, heteropolyacid-catalyzed thermal and/or photoatalytic re-mediation could be an attractive alternative for the degradation of refractory, colored compounds using relatively mild wet oxidation operating conditions or even natural solar light.
AB - The purpose of the present study was to evaluate the catalytic effect of a heteropoly acid, namely H4SiW12O40, on aqueous Acid Orange 7, a well-known, representative textile monoazo dye applied to nylon fabrics, in sub-critical water (T=160°C-290°C; P=0.6-3.0 MPa, pH=2.6) and under near-UV-VIS light irradiation (isopropanol: water ratio=1:10; pH=2.8). SiW12O404--catalyzed photochemical Acid Orange 7 bleaching was also explored in the presence of two dye assisting chemicals as well as in simulated acid dye wastewater at its natural, acidic pH under otherwise identical reaction conditions. Though less explored than TiO2-mediated, heterogeneous photocatalytic treatment, heteropolyacid-catalyzed thermal and/or photoatalytic re-mediation could be an attractive alternative for the degradation of refractory, colored compounds using relatively mild wet oxidation operating conditions or even natural solar light.
KW - Acid dye wastewater
KW - Acid Orange 7
KW - Acid-catalyzed photochemical treatment
KW - Dyehouse effluent
KW - Wet air oxidation
UR - http://www.scopus.com/inward/record.url?scp=0042575290&partnerID=8YFLogxK
U2 - 10.1081/ESE-120021484
DO - 10.1081/ESE-120021484
M3 - Article
C2 - 12929812
AN - SCOPUS:0042575290
SN - 1093-4529
VL - 38
SP - 1615
EP - 1627
JO - Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
JF - Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
IS - 8
ER -