Unformatted text preview: ES Salmiah Md Zain and *M.A. Nawi School of Chemical Sciences, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia E-mail: [email protected] In this study, the fabrication of immobilized TiO 2 Degussa P-25 (P-25) powder has been developed by applying ENR/PVC blend as adhesives in a coating formulation that allows immobilization of the catalyst via simple dip coating technique onto glass plate. The photocatalytic activities of the immobilized catalyst were evaluated using an azo-dye Reactive Red 4 (RR4) as a model pollutant under the irradiation of 45W fluorescent lamp. Based on the photocatalytic removal rate and the adhesion of the P-25 powder, the optimum ratio of ENR to PVC for the immobilization was found to be as 1:2. Based on Langmuir-Hinshelwood kinetic model, the optimum pseudo-first-order photocatalytic degradation rate -1 -1 of RR4 for immobilized and aqueous slurry P-25 was found to be 0.086 min and 0.167 min , respectively. It was also observed that the incorporated ENR/PVC polymer within the immobilized substrate degraded under irradiation since chemical oxygen demand (COD) values were detected in the th treated ultrapure water. No COD values were detected on the 5 cycle of reuse of P-25/ENR/PVC plate indicating of the cessation of the degradation of the p olymers. Optimization of the operational parameters such as aeration rate, loading of catalyst, pH and initial RR4 concentration had also been carried out. Application of 40 mL/min of aeration into the system yields a RR4 degradation rate of 4 -3 2 times better than without aeration. The optimal P-25 dosage was about 1.48 x 10 g/cm . The average pseudo first order rate constant of RR4 removal for 10 cycles of 1 hour repeated applications of the -1 immobilized P-25 is 0.061 ±0.006 min . ENV-P20 MLR- AND ANN-QSAR MODELS FOR PREDICTING TOXICITY OF NITROBENZENE DERIVATIVES USING TOPOLOGICAL DESCRIPTORS
1 Jennifer C. Sy, Alex A. Tardaguila, Eric R. Punzalan and Dennis S. J. Tuyogon 1 2 3 2 Department of Physical Science...
View Full Document
This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.
- Spring '11