Nanoscale zero-valent iron particles supported on reduced graphene oxides by using a plasma technique and their application for removal of heavy-metal ions.
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.
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.
Jie
J
Li
Institute of Plasma Physics, Chinese Academy of Sciences, P. O. Box 1126, Hefei, 230031, P.R. China. clchen@ipp.cas.cn.|Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Suzhou, 215123, P.R. China. clchen@ipp.cas.cn.
Changlun
C
Chen
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.
Rui
R
Zhang
Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Suzhou, 215123, P.R. China. xkwang@ipp.ac.cn.|School for Radiological and Interdisciplinary Sciences (RAD-X), Soochow University, Suzhou, 215123, P.R. China. xkwang@ipp.ac.cn.
Xiangke
X
Wang
D000327:Adsorption; D011232:Chemical Precipitation; D002857:Chromium / Q000302:isolation & purification; D006108:Graphite / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D007854:Lead / Q000302:isolation & purification; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D019216:Metals, Heavy / Q000737:chemistry / Q000302:isolation & purification*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry; D056951:Photoelectron Spectroscopy
D007477:Ions; D019216:Metals, Heavy; D010087:Oxides; D002857:Chromium; D007854:Lead; D006108:Graphite; D007501:Iron
chromium; graphene; iron; lead; plasma chemistry