Removal of Pentachlorophenol by Adsorption on Magnetite-immobilized Chitin
Authors: Pang, K.; Ng, S.; Chung, W.; Wong, P.1
Source: Water, Air, and Soil Pollution, Volume 183, Numbers 1-4, July 2007 , pp. 355-365(11)
Publisher: Springer
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Abstract:
The application of magnetite-immobilized chitin in pentachlorophenol (PCP) removal was demonstrated in this study. The physicochemical parameters for immobilization of chitin by magnetite, and for PCP adsorption using magnetite-immobilized chitin were optimized. For chitin immobilization, the optimized conditions were: magnetite to chitin (m:c) ratio at 1:2, initial pH 6, 25°C, 200 rpm and 60 min in batch system. The immobilization efficiency (IE) was 99.4% and immobilization capacity (IC) was 2.0 mg chitin mg−1 magnetite. High initial pH (pH > 11) and temperature (>30°C) lowered the IE and IC. For PCP (10 mg l−1) adsorption, the optimized conditions were: 1,500 mg l−1 immobilized chitin, initial pH 6, 25°C, 200 rpm and 60 min in batch system. The removal efficiency (RE) was 57.9% and removal capacity (RC) was 5.4 mg g−1. The adsorption ability of immobilized chitin decreased with pH and temperature increased. However, increasing the amount of immobilized chitin (24,000 mg l−1) can increase the RE up to 92%. Both chitin immobilization and PCP adsorption exhibited Langmuir and Freundlich adsorption isotherms. Results in this study indicated that magnetite-immobilized chitin was a cost-effective and environmental friendly adsorbent to remove environmental pollutants such as PCP.Keywords: Adsorption; Pentachlorophenol; Chitin; Magnetite; Immobilization
Document Type: Research article
DOI: 10.1007/s11270-007-9384-2
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