title: Comparative evaluation of magnetite-graphene oxide and magnetite-reduced graphene oxide composite for As(III) and As(V) removal.
abstract: Arsenic removal using Fe3O4-graphene oxide composite (M-GO) and Fe3O4-reduced graphene oxide composite (M-rGO) was investigated. The M-GO was more effective to adsorb both As(III) and As(V) than M-rGO, because the more functional groups existing on the M-GO could lead to synthesize more Fe3O4 with M-GO. As(III) was more favorable to be adsorbed than As(V) onto both M-GO and M-rGO. According to the effect of pH on arsenic removal, the electrostatic interaction between the positively charged surface of Fe3O4-graphene based adsorbents and anionic As(V) species was a major factor to adsorb As(V). The adsorption mechanism of As(III), on the other hand, was strongly affected by a surface complexation, rather than electrostatic interactions. Consequently, in terms of the process energy consumption, energy saving could be achieved via omitting the reduction process to fabricate M-rGO from M-GO and the pre-oxidation process to convert As(III) to As(V).
authors.affiliation: Yonsei University, Department of Environmental Engineering, Maeji-ri, Heungeop-myeon, Gangwon-do, Wonju-si 220-710, Republic of Korea.
authors.forename: Yeojoon
authors.initials: Y
authors.lastname: Yoon
authors.affiliation: Electronic Materials and Device Research Center, Korea Electronics Technology Institute, 25 Saenari-ro, Bundang-gu, Gyeonggi-do, Seongnam-si 463-816, Republic of Korea; School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 440-746, South Korea.
authors.forename: Won Kyu
authors.initials: WK
authors.lastname: Park
authors.affiliation: Water Resources and Environmental Research Division, Korea Institute of Construction Technology, 2311, Deawha-dong, Ilsan-gu, Gyeonggi-do, Goyang-si 411-712, Republic of Korea.
authors.forename: Tae-Mun
authors.initials: TM
authors.lastname: Hwang
authors.affiliation: School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 440-746, South Korea.
authors.forename: Dae Ho
authors.initials: DH
authors.lastname: Yoon
authors.affiliation: Electronic Materials and Device Research Center, Korea Electronics Technology Institute, 25 Saenari-ro, Bundang-gu, Gyeonggi-do, Seongnam-si 463-816, Republic of Korea. Electronic address: wsyang@keti.re.kr.
authors.forename: Woo Seok
authors.initials: WS
authors.lastname: Yang
authors.affiliation: Yonsei University, Department of Environmental Engineering, Maeji-ri, Heungeop-myeon, Gangwon-do, Wonju-si 220-710, Republic of Korea. Electronic address: jwk@yonsei.ac.kr.
authors.forename: Joon-Wun
authors.initials: JW
authors.lastname: Kang
keywords: Adsorption; Arsenic; Graphene oxide; Magnetite; Reduced graphene oxide