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Modification of Pineapple Peel Fiber as Metal Ion Adsorbent through Reaction with Succinic Anhydride in Pyridine and Dimethyl Sulfoxide Solvents

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Reactions between saponified pineapple peel fiber (SPPF) and succinic anhydride were performed in refluxed pyridine and dimethyl sulfoxide to obtain modified pineapple peel fiber in pyridine (MPPF-PY) and modified pineapple peel fiber in dimethyl sulfoxide at room temperature (MPPF-DMRT) and at 70°C (MPPF-DM70) as novel metal ionic adsorbents. The modified pineapple peel fibers were characterized by Fourier transform infrared (FTIR) and X-ray diffraction (XRD). The MPPF-PY, MPPF-DMRT, and MPPF-DM70 showed higher Cu2+, Cd2+, and Pb2+ adsorption capacity than raw pineapple peel fiber (RPPF) and SPPF. Dimethyl sulfoxide favored introduction of a carboxylic function group into pineapple peel fiber compared with pyridine. The elevated reaction temperature of dimethyl sulfoxide could increase the adsorption capacity of the modified pineapple fiber. Optimum pH values for Cu2+, Cd2+, and Pb2+ removal by MPPF-DM70 were pH 5.5, 7.5, and 5.5, respectively. The Cu2+, Cd2+, and Pb2+ adsorptions by MPPF-DM70 followed the pseudo second-order kinetics model and Langmuir model.
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Keywords: dimethyl sulfoxide; metal ionic adsorbent; pineapple peel fiber; succinic anhydride-modification

Document Type: Research Article

Publication date: 2010-08-01

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