Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, People's Republic of China.
School of Chemistry and Environmental Engineering, Yancheng Teachers University, Yancheng, 224002, People's Republic of China.
Environ Sci Pollut Res Int. 2019 Mar;26(9):8768-8778. doi: 10.1007/s11356-019-04394-w. Epub 2019 Feb 2.
Fe-Ni bimetallic nanoparticles supported on CNTs (Fe-Ni/CNTs) were synthesized, characterized, and applied for removal of 2,4-dichlorophenol (2,4-DCP) in aqueous solution. The removal performance was enhanced drastically on Fe-Ni/CNTs with respect to monometallic Fe/CNTs. The synergistic effect between Fe-Ni nanoparticles and CNTs has been studied in detail. The research results indicated that the doping of Ni played an important role in promoting the catalytic degradation of 2,4-DCP. And the presence of CNTs not only could effectively reduce the aggregation of nanoparticles but also facilitate the mass transfer of 2,4-DCP and the formation of active atomic hydrogen during the catalytic process. In addition, the removal kinetics of 2,4-DCP by Fe-Ni/CNTs were in agreement with a pseudo-first-order model, and the rate constants were dependent on a number of factors including the initial concentration of 2,4-DCP, the dosage of Fe-Ni/CNTs, pH value of the solution, and doping amount of Ni. The degradation mechanism involved the adsorption by CNTs and catalytic reduction by Fe under the stimulating of Ni, and the preferred dechlorination followed the order of para-Cl > ortho-Cl. The study confirmed that Fe-Ni/CNTs had a potential to be a promising catalytic material for removal of chlorophenol and had a great prospect for practical application.
负载在 CNTs 上的 Fe-Ni 双金属纳米粒子（Fe-Ni/CNTs）被合成、表征，并应用于水溶液中 2,4-二氯苯酚（2,4-DCP）的去除。与单金属 Fe/CNTs 相比，Fe-Ni/CNTs 的去除性能有了显著提高。详细研究了 Fe-Ni 纳米粒子和 CNTs 之间的协同效应。研究结果表明，Ni 的掺杂在促进 2,4-DCP 的催化降解方面发挥了重要作用。而 CNTs 的存在不仅可以有效减少纳米粒子的聚集，而且有利于 2,4-DCP 的传质和催化过程中活性原子氢的形成。此外，Fe-Ni/CNTs 对 2,4-DCP 的去除动力学符合准一级模型，且速率常数取决于 2,4-DCP 的初始浓度、Fe-Ni/CNTs 的用量、溶液的 pH 值和 Ni 的掺杂量等多个因素。降解机制涉及 CNTs 的吸附和 Fe 在 Ni 的刺激下的催化还原，优先脱氯遵循对氯>邻氯的顺序。该研究证实，Fe-Ni/CNTs 有望成为去除氯酚的一种有前途的催化材料，具有很大的实际应用前景。
