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论文类型：期刊论文

发表时间：2008-08-30

发表刊物：JOURNAL OF HAZARDOUS MATERIALS

收录刊物：SCIE、EI、Scopus

卷号：157

期号：1

页面范围：179-186

ISSN号：0304-3894

关键字：microwave; catalytic oxidation; granular activated carbon; platinum; phenolic pollutants

摘要：Granular activated carbon-supported platinum (Pt/GAC) catalysts were prepared by microwave irradiation and characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). Pt particles dispersing onto the surface of GAC could be penetrated by microwave and acted as "reaction centre" in the degradations of p-nitrophenol (PNP) and pentachlorophenol (PCP) in aqueous solution by microwave-assisted catalytic oxidation. The reaction was carried out through a packed bed reactor under ambient pressure and continuous flow mode. Under the conditions of microwave power 400 W, influent flow 6.4 mL min-' and air flow 120 mL min', phenolic solutions with high concentration (initial concentrations of PNP and PCP solutions were 1469 and 1454 mg L- 1, respectively) were treated effectively by PUGAC, 86% PNP and 90% PCP were degraded and total organic carbon (TOC) removal reached 85% and 71 %, respectively. Compared with GAC, loaded Pt apparently accelerated oxidative reaction so that PUGAC had a better degrading and mineralizing efficiencies for PNP. Hydraulic retention time was only 16 min in experiment, which was shortened greatly compared with catalytic wet air oxidation. Pyrolysis and oxidation of phenolic pollutants occurred simultaneously on the surface of PUGAC by microwave irradiation. (c) 2008 Elsevier 13N. All rights reserved.