Li Jie, Chen Changlun, Zhang Rui, Wang Xiangke
Institute of Plasma Physics, Chinese Academy of Sciences, P. O. Box 1126, Hefei, 230031, P.R. China.
University of Science and Technology of China, Hefei, 230026, P.R. China.
Chem Asian J. 2015 Jun;10(6):1410-7. doi: 10.1002/asia.201500242. Epub 2015 Apr 27.
Nanoscale zero-valent iron particles supported on reduced graphene oxides (NZVI/rGOs) from spent graphene oxide (GO)-bound iron ions were developed by using a hydrogen/argon plasma reduction method to improve the reactivity and stability of NZVI. The NZVI/rGOs exhibited excellent water treatment performance with excellent removal capacities of 187.16 and 396.37 mg g(-1) for chromium and lead, respectively. Moreover, the NZVI/rGOs could be regenerated by plasma treatment and maintained high removal ability after four cycles. X-ray photoelectron spectroscopy analysis results implied that the removal mechanisms could be attributed to adsorption/precipitation, reduction, or both. Such multiple removal mechanisms by the NZVI/rGOs were attributed to the reduction ability of the NZVI particles and the role of dispersing and stabilizing abilities of the rGOs. The results indicated that the NZVI/rGOs prepared by a hydrogen/argon plasma reduction method might be an effective composite for heavy-metal-ion removal.
通过氢/氩等离子体还原法，利用废氧化石墨烯（GO）结合的铁离子制备了负载在还原氧化石墨烯（NZVI/rGOs）上的纳米级零价铁颗粒，以提高NZVI的反应活性和稳定性。NZVI/rGOs表现出优异的水处理性能，对铬和铅的去除能力分别达到187.16和396.37 mg g(-1)。此外，NZVI/rGOs可通过等离子体处理再生，经过四个循环后仍保持较高的去除能力。X射线光电子能谱分析结果表明，去除机制可能归因于吸附/沉淀、还原或两者兼有。NZVI/rGOs的这种多种去除机制归因于NZVI颗粒的还原能力以及rGOs的分散和稳定作用。结果表明，通过氢/氩等离子体还原法制备的NZVI/rGOs可能是一种有效的重金属离子去除复合材料。
