سال انتشار: ۱۳۸۵

محل انتشار: یازدهمین کنگره ملی مهندسی شیمی ایران

تعداد صفحات: ۱۰

نویسنده(ها):

Niyaz Mohammad Mahmoodi – Colorant Manufacturing and Environmental Science Department, Institute for Colorants, Paint and Coating,Tehran, Iran
Mokhtar Arami – Colorant Manufacturing and Environmental Science Department, Institute for Colorants, Paint and Coating,Tehran, Iran ، Textile Engineering Department, Amirkabir University of technology, Tehran, Iran
Nargess Yousefi Limaee – Colorant Manufacturing and Environmental Science Department, Institute for Colorants, Paint and Coating,Tehran, Iran
Kamaladin Gharanjig – Colorant Manufacturing and Environmental Science Department, Institute for Colorants, Paint and Coating,Tehran, Iran

چکیده:

This paper deals with the decolorization and mineralization of reactive dyes by heterogeneous nanophotocatalysis using an immobilized TiO2 nanoparticle photocatalytic reactor. A simple and effective method was used to immobilization of titanium dioxide nanoparticles. Reactive Orange 107 (RO 107, sulphatoethylsulphonyl reactive dye) and Reactive Red 152 (RR 152, monochlorotriazine reactive dye) were used as model compounds. UV-Vis and Ion Chromatography (IC) analyses were employed to obtain the details of the photocatalytic degradation of the selected dyes. The effects of operational parameters such as H2O2, dye concentration, anions (NO3-, Cl-, SO4 2-, HCO3- and CO3 2-) and pH were investigated. Formate, acetate and oxalate anions were detected as dominant aliphatic intermediates where, they were further oxidized slowly to CO2. Nitrate, sulfate and chloride anions were detected as the photocatalytic mineralization of RO 107 and RR 152. Kinetics analysis indicates
that the photocatalytic decolorization rates can usually be approximated zero-order model for RO 107 and first-order model for RR 152 dyes. Results show that the photocatalytic process occurred at solution bulk and the employment of optimal operational parameters may lead tocomplete decolorization and mineralization of dye solutions.