College of Chemistry and Chemical Engineering, Shaoxing University, Huancheng West Road, Shaoxing 312000, PR China.
Environ Pollut. 2011 Dec;159(12):3744-9. doi: 10.1016/j.envpol.2011.07.016. Epub 2011 Sep 9.
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.
纳米零价铁（NZVI）被固定在有机膨润土（CTMA-膨润土）上，以提高 NZVI 的反应活性并防止其聚集。这种新型复合材料（NZVI/CTMA-膨润土）通过透射电子显微镜和 X 射线衍射进行了表征。观察到 NZVI 颗粒在膨润土上良好的分散性。通过批量实验研究了其对五氯苯酚（PCP）的去除性能。结果表明，NZVI/CTMA-膨润土能够快速、完全地将 PCP 脱氯为苯酚，去除率为 96.2%。这高于 NZVI（31.5%）单独还原和 CTMA-膨润土（23.0%）单独吸附的总和（54.5%）。动力学研究表明，PCP 的去除速率与吸附呈正相关。我们提出，CTMA-膨润土对 PCP 的吸附增强了 PCP 从水相向铁表面的传质。此外，NZVI/CTMA-膨润土表现出良好的稳定性和可重复使用性，CTMA-膨润土还可以减少释放到溶液中的铁离子的量。
