Articles written in Bulletin of Materials Science

    • Facile fabrication of organobentonite–carboxymethyl chitosan hybrid film that absorbs organophosphate insecticides


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      Organophosphate (OP)-insecticide-absorbing hybrid film containing 10% (w/w) organobentonite and carboxymethylchitosan (CMCh) was fabricated and tested. Bentonite clay was modified to organobentonite by two stepsmodification with (1) NaCl and (2) plant alkaloid monovalent cation berberine. CMCh was synthesized from commercialshrimp chitosan. Afterwards, organobentonite was immobilized into CMCh matrix via in situ polymerization of CMCh tocast a hybrid film with 0.5 mm thickness. Scanning electron microscopy images of organobentonite powder and the filmrevealed the porous material and layer-upon-layer structure, respectively, which is supposed to enhance the water permeabilityof the film. Fourier transform infrared spectrometry analysis revealed similarly chemical characteristics of the CMChcomponent in the film and synthesized CMChpolymer powder. The film was then investigated to remove four OP insecticidesincluding profenofos, chlorpyrifos, methyl parathion and dimethoate of 5 ppm concentration in spiked water samples viabatch filtration. High-pressure liquid chromatography analysis showed that the removal rates for profenofos, chlorpyrifos,methyl parathion and dimethoate after seven batches were 42, 39, 24 and 20%, respectively. Hence, absorptivity of thisfilm for tested OP insecticides was demonstrated. Furthermore, the combination of organobentonite and natural chitosan ispromising for novel absorptive film material generation with regard to environmental clean-up study.

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