Preparation of graphene oxide/organo-modified bentonite composites and their adsorption on Cd(Ⅱ)

被引：0
|
作者：
Tang Z. [1 ]
Bi Y. [1 ]
Liu Y. [1 ]
Hua Y. [3 ]
Ling H. [1 ]
Xie S. [1 ,2 ]
机构：
[1] Hu'nan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China, Hengyang
[2] Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang
[3] State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2018年 / 35卷 / 11期
关键词：
Adsorption; Cd(Ⅱ); Coexisting ion; Desorption; Graphene oxide; Organo-modified bentonite;
D O I：
10.13801/j.cnki.fhclxb.20180310.002
中图分类号：
学科分类号：
摘要：
Graphene oxide/organo-modified bentonite(GO/OM-Bent) composites were prepared by the synthesis of GO, Bent and cetyltrimethyl ammonium bromide (CTAB), then the composites were used to treat Cd(Ⅱ)-containing wastewater at a concentration of 10 mg•L -1 . The effects of GO content in GO/OM-Bent composite, pH value, GO/OM-Bent composite dosage, reaction time, initial concentration of cadmium and coexisting ions on adsorption of Cd(Ⅱ) by GO/OM-Bent composite were investigated by batch test. The adsorption results of GO/OM-Bent composites are balanced at 120 min with the best effect on Cd(Ⅱ) adsorption under the optimal condition: the pH value is 6, the mass fraction of GO is 30wt%, the GO/OM-Bent composite dosage is 200 mg•L -1 ; Under the same conditions, the adsorption capacity of GO/OM-Bent composite is 12.01 mg•g -1 and 5.39 mg•g -1 higher than that of OM-Bent and GO, respectively; the pseudo-second-order kinetics model can well describe the adsorption process and the adsorption isotherm conforms to the Langmuir model. At 303 K, the maximum adsorption capacity of GO/OM-Bent composite on Cd(Ⅱ) could be reached 133.33 mg•g -1 . The results of desorption test shows that the adsorption efficiency of Cd(Ⅱ) remains as high as 83.5% after 5 cycles of adsorption-desorption, indicating that GO/OM-Bent composite has good cyclic regeneration performance. © 2018, Editorial Office of Acta Materiae Compositae Sinica. All right reserved.
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页码：3196 / 3204
页数：8
相关论文
共 33 条
  • [1] Wu X., Tan K.Y., Hu X.J., Et al., Experimental study on removal efficiency of cadmium-containing wastewater by sulfate reducing biofilter, Environmental Science, 35, 4, pp. 1366-1371, (2014)
  • [2] Zhang F.K., Xu L.J., Zhang D.Y., Adsorption of cadmium-containing wastewater by exfoliating coal-based activated carbon, Journal of Environmental Engineering, 8, 2, pp. 559-562, (2014)
  • [3] Xie S.B., Luo J.Y., Liu Q., Et al., Adsorption characteristics and mechanism of hydroxyethyl cellulose/sodium alginate blend films for uranium(Ⅵ), Acta Materiae Compositae Sinica, 32, 1, pp. 268-275, (2015)
  • [4] Chang Y., Advances in research of technological processes of cadmium-containing wastewater treatment, Water Purification Technology, 32, 3, pp. 1-4, (2013)
  • [5] Ye G.R., Yan Y.W., Cao H.L., Basalt fiber modified with graphene oxide and properties of its reinforced epoxy composites, Acta Materiae Compositae Sinica, 31, 6, pp. 1402-1408, (2014)
  • [6] Wang H., Yuan X., Wu Y., Et al., Adsorption characteristics and behaviors of graphene oxide for Zn(Ⅱ) removal from aqueous solution, Applied Surface Science, 279, 8, pp. 432-440, (2013)
  • [7] Zhao G., Li J., Ren X., Et al., Few-layered graphene oxide nanosheets as superior sorbents for heavy metal ion pollution management., Environmental Science & Technology, 45, 24, pp. 10454-10462, (2011)
  • [8] Li S.Y., Xiong F., Wang L., Et al., Adsorption properties of graphene oxide/SiO <sub>2</sub> composites for Cd(Ⅱ) , Acta Materiae Compositae Sinica, 34, 6, pp. 1205-1211, (2017)
  • [9] Liu X., Pan L., Lv T., Et al., Microwave-assisted synthesis of CdS-reduced graphene oxide composites for photocatalytic reduction of Cr(Ⅵ), Chemical Communications, 47, 43, pp. 11984-11986, (2011)
  • [10] Wang H., Liu Y.G., Zeng G.M., Et al., Grafting of β-cyclodextrin to magnetic graphene oxide via ethylenediamine and application for Cr(Ⅵ) removal, Carbohydrate Polymers, 113, pp. 166-173, (2014)
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