Synthesis of chitosan functionalized magnetic graphene oxide composite and adsorption on methyl orange

被引：0

作者：

Huang W. ^{[1
]}

Deng C. ^{[1
]}

Ji Y. ^{[1
]}

Zhang D. ^{[1
]}

Yu Z. ^{[1
]}

机构：

[1] School of Biology, Food and Environment, Hefei University, Hefei

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2021年 / 38卷 / 04期

关键词：

Adsorption; Chitosan; Composites; Grapheme oxide; Hydrothermal method; Methyl orange;

D O I：

10.13801/j.cnki.fhclxb.20200723.003

中图分类号：

学科分类号：

摘要：

The chitosan/magnetic graphene oxide (CS/MGO) composites were synthesized by the modified Hummers and hydrothermal methods and applied as an adsorbent for the removal of methyl orange (MO). CS/MGO composite was characterized by SEM, XRD, BET, FTIR and a vibrating sample magnetometer (VSM). Results show that Fe3O4 nanoparticles mainly exist on the surface of graphene oxide and chitosan (CS) composite with less aggregation and a good magnetic response. In addition, the thermal stability is good, and the specific surface area of CS/MGO is 36.873 m2·g−1. CS/MGO composite could be easily separated by magnetic separation and demonstrates good stability and reusability. The effects of pH, initial concentration of MO, CS/MGO composite amount and regeneration on the removal of MO were systematically investigated. The results reveal that the initial MO concentration of 20 mg·L−1, CS/MGO composite amount of 0.12 g·L−1, and pH=3 lead to the adsorption equilibrium after 210 min. CS/MGO composite maintains 83.7% of its maximum MO adsorption capacity after five consecutive cycles. The adsorption process conforms to the pseudo-second-order kinetic model, and the adsorption isotherms conform to the Langmuir model. The maximum adsorption amounts at 298.15, 303.15 and 308.15 K are 129.96, 138.94 and 145.03 mg·g−1, respectively. The adsorption thermodynamics indicate that the adsorption process is endothermic; entropy increases the spontaneous adsorption process. Copyright ©2021 Acta Materiae Compositae Sinica. All rights reserved.

引用

页码：1262 / 1271

页数：9

共 28 条

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