title: Enhanced removal of pentachlorophenol by a novel composite: nanoscale zero valent iron immobilized on organobentonite.
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.
authors: College of Chemistry and Chemical Engineering, Shaoxing University, Huancheng West Road, Shaoxing 312000, PR China. liym@usx.edu.cn
authors: Yimin
authors: Y
authors: Li
authors: Yun
authors: Y
authors: Zhang
authors: Jianfa
authors: J
authors: Li
authors: Xuming
authors: X
authors: Zheng
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D053761:Nanocomposites / Q000737:chemistry*; D010316:Particle Size; D010416:Pentachlorophenol / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D014874:Water Pollutants, Chemical; D001546:Bentonite; D010416:Pentachlorophenol; D007501:Iron