Enhanced removal of pentachlorophenol by a novel composite: nanoscale zero valent iron immobilized on organobentonite |
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Authors: | Li Yimin Zhang Yun Li Jianfa Zheng Xuming |
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Institution: | a College of Chemistry and Chemical Engineering, Shaoxing University, Huancheng West Road, Shaoxing 312000, PR China b Department of Chemistry and State Key Laboratory of ATMMT (MOE), Zhejiang Sci-Tech University, Hangzhou 310018, PR China |
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Abstract: | Nanoscale zero valent iron (NZVI) was immobilized on the organobentonite (CTMA-bent), so as to enhance the reactivity of NZVI and prevent its aggregation. This novel composite (NZVI/CTMA-Bent) was characterized by transmission electron microscope and X-ray diffraction. Good dispersion of NZVI particles on the bentonite was observed. Its performance on removing pentachlorophenol (PCP) was investigated by batch experiments. Results showed NZVI/CTMA-Bent could rapidly and completely dechlorinate PCP to phenol with an efficiency of 96.2%. It was higher than the sum (54.5%) of reduction by NZVI (31.5%) and adsorption by CTMA-Bent (23.0%) separately. The kinetic studies indicated the removal rate of PCP was positively related to the adsorption. We proposed that the adsorption of PCP by CTMA-Bent enhanced the mass transfer of PCP from aqueous to iron surface. Besides, NZVI/CTMA-Bent exhibited good stability and reusability, and CTMA-Bent could also reduce the amount of iron ions released into the solution. |
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Keywords: | Organobentonite Immobilization Nanoscale zero valent iron Pentachlorophenol Removal |
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