FUEL 8 |
| To enhance degradation rate and removal efficiency of organic contaminations in aqueous solution, avoid the drawback of homogeneous catalyst's leaching and separation, and sufficiently utilize ultraviolet light emitted from plasma channels generated by pulsed high-voltage electrical discharge, TiO2-supported AC (AC/TiO2) catalyst made by sol-gel method has first introduced into pulsed high-voltage electrical discharge plasma (PDP) process for the removal of toxic organic pollutant para-chlorophenol (4-CP) in aqueous solution. Experimental results showed that the crystal structure of TiO2 on AC surface identified by XRD was mostly anatase phase, and the optimal load amount of TiO2 by analysis of XPS was approximately 1.65% (wt.). Under the conditions, the pseudo-first rate constant of 4-CP degradation (kcp) for 0.2 g/L AC/TiO2 catalyst present in pulsed high-voltage electrical discharge process was greatly promoted from 1.86 × 10-3 s-1 with AC to 2.41× 10-3 s-1 with AC/TiO2 catalyst, which was increased by 29.6%. In addition, energy efficiency of 4-CP removal with AC/TiO2 catalyst for 1.87 g kWh-1 was enhanced by 65.5% as compared with AC for 1.13 g kWh-1. Little 4-CP remained on AC/TiO2 catalyst surface (<1.5% in proportion to initial 4-CP load amount) after treatment in such a process, indicating AC/TiO2 catalyst could be renewed and reused in PDP process. Therefore, a novel water treatment process combining AC/TiO2 catalyst with PDP process was proposed. |
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Green Chemistry for Sustainable Energy Supply and Conversion
8:25 AM-12:10 PM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 242, Oral
Division of Fuel Chemistry |