Biocompatible G-Fe3O4/CA nanocomposites for the removal of Methylene Blue

被引:54
|
作者
Song, Na [1 ]
Wu, Xi-Lin [1 ]
Zhong, Shuxian [1 ]
Lin, Hongjun [1 ]
Chen, Jian-Rong [1 ]
机构
[1] Zhejiang Normal Univ, Coll Chem & Life Sci, Coll Geog & Environm Sci, Jinhua 321004, Peoples R China
基金
中国国家自然科学基金;
关键词
Graphene-Fe3O4; Calcium alginate; Composites; Adsorption; Methylene Blue; LOW-COST ADSORBENTS; AQUEOUS-SOLUTIONS; CARBON NANOTUBES; DYE REMOVAL; ADSORPTION PROPERTIES; GRAPHENE OXIDE; ACTIVATED CARBON; REACTIVE DYE; WASTE-WATER; AZO DYES;
D O I
10.1016/j.molliq.2015.08.059
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Novel graphene based composites were prepared by encapsulating magnetic graphene (G-Fe3O4) into calcium alginate (CA). The obtained graphene-Fe3O4/CA composites were further applied as adsorbent for the removal of Methylene Blue (MB). Adsorption of MB onto G-Fe3O4/CA was investigated with respect to pH, adsorption time, initial MB concentration and temperature. Kinetics data and adsorption isotherm obtained at pH 7 were better fitted by pseudo-second-order kinetic model and by Langmuir isotherm, respectively. The values of activation parameters such as free energy (Delta G, -3.88 to -7.64.kJ mol(-1)), enthalpy (Delta H, 51.24 kJ mol(-1)) and entropy (Delta S, 188.06 J mol(-1) K-1) were calculated, indicating that the adsorption was spontaneous, favorable and an endothermic process in nature. The results suggest that the G-Fe3O4/CA composites are potential and suitable materials in the preconcentration of organic dyes from large volumes of wastewater. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:63 / 69
页数:7
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