Adsorption of Cd(II) in water by graphene oxide/calcium alginate hydrogel composite membrane

被引：0
作者：
Bai C. [1 ]
Wang L. [1 ]
Zhu Z. [1 ,2 ]
Wang X. [1 ]
机构：
[1] Key Laboratory of Membrane Separation of Shaanxi Province, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an
[2] Province Key Laboratory of Sustained Utilization and Development of Water Resources, School of Water Resources and Environment, Hebei GEO University, Shijiazhuang
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2020年 / 37卷 / 06期
关键词：
Adsorption; Cd(II); Composite membrane; Graphene oxide; Hydrogel;
D O I：
10.13801/j.cnki.fhclxb.20191016.001
中图分类号：
学科分类号：
摘要：
The crosslinked graphene oxide (GO)/calcium alginate (CA) hydrogel composite membranes, prepared by blending GO, porogenas as well as Na alginate hydrogel (SA), cross-linking with CaCl2, were used as adsorbent for wastewater containing heavy metal ions. SEM and TEM were used to characterize the composite membranes. The influences of GO on the mechanical properties, average pore diameter, water flux and surface functional groups of the composite membrane were analyzed. To explore the adsorption performance of GO/CA hydrogel composite membrane, the influencing factors of Cd(II) adsorption including pH (6-7), initial ion concentration, contact time and temperature (all positively correlated) were investigated. The composite membranes before and after adsorption of Cd(II) were characterized by FTIR and XPS; The adsorption kinetics and adsorption isotherm model were introduced to analyze the adsorption mechanism. The results show that the introduction of GO improves the mechanical properties, average pore diameter and water flux of the composite membrane. The adsorption process follows the Langmuir isotherm, belonging to the monolayer adsorption. The maximum adsorption capacity is 173.61 mg/g. The pseudo-first and pseudo-second adsorption kinetics could describe the adsorption process at low and high concentration, respectively. The adsorption mechanism is mainly physical force adsorption and ion exchange. The recyclability of the GO/CA hydrogel composite membranes was demonstrated by five successive adsorption-desorption cycles. © 2020, Editorial Office of Acta Materiae Compositae Sinica. All right reserved.
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页码：1458 / 1465
页数：7
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