SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2023, Vol. 53 ›› Issue (1): 374-380.DOI: 10.1016/j.cjche.2022.01.023

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Design, synthesis, and nanoengineered modification of spherical graphene surface by layered double hydroxide (LDH) for removal of As(III) from aqueous solutions

Najma Kamali1, Jahan B. Ghasemi1, Ghodsi Mohammadi Ziarani2, Sahar Moradian1, Alireza Badiei1   

  1. 1. School of Chemistry, College of Science, University of Tehran, Tehran, Iran;
    2. Department of Organic Chemistry, Faculty of Chemistry, Alzahra University, Vanak Square, Tehran, Iran
  • Received:2021-10-16 Revised:2021-12-08 Online:2023-04-08 Published:2023-01-28
  • Contact: Alireza Badiei,E-mail:abadiei@ut.ac.ir
  • Supported by:
    The authors wish to thank the University of Tehran for financial support.

Design, synthesis, and nanoengineered modification of spherical graphene surface by layered double hydroxide (LDH) for removal of As(III) from aqueous solutions

Najma Kamali1, Jahan B. Ghasemi1, Ghodsi Mohammadi Ziarani2, Sahar Moradian1, Alireza Badiei1   

  1. 1. School of Chemistry, College of Science, University of Tehran, Tehran, Iran;
    2. Department of Organic Chemistry, Faculty of Chemistry, Alzahra University, Vanak Square, Tehran, Iran
  • 通讯作者: Alireza Badiei,E-mail:abadiei@ut.ac.ir
  • 基金资助:
    The authors wish to thank the University of Tehran for financial support.

Abstract: In this study, new nano spherical graphene modified with LDH (Layered Double Hydroxide) was prepared and used to remove As(III) ion from aqueous solutions. At first, graphene oxide was synthesized from graphite using a well-known Hammer method. The obtained graphene oxide solution was sprayed in octanol solution under different temperatures and sprayed speed as influenced variables. The structure and physical characterization of synthesized spherical graphene oxide were determined by various techniques, including FT-IR, N2 adsorption–desorption, SEM, TEM, and EDX. In the next step, the hydrothermal method was applied to deposition LDH on the spherical graphene oxide. The synthesized spherical graphene modified by LDH was used to remove As(III) as a toxic heavy metal ion. The effect of influenced variables including pH, contact time, amount of sorbent, and type eluent studied and the optimum values were as 8, 30, 50, and HCl (0.5 mol·L-1), respectively. After optimization, the studied sorbent was shown a high adsorption capacity (149.3 mg·g-1). The adsorption mechanism and kinetic models exhibited good agreement with the Langmuir isotherm and pseudo-second-order trends, respectively. Besides, the synthesized product was tested for seven times without significant loss in its sorption efficiency.

Key words: Graphene-based spherical adsorbent, Layered double hydroxide (LDH), Adsorption, Spray-assisted deep-frying

摘要: In this study, new nano spherical graphene modified with LDH (Layered Double Hydroxide) was prepared and used to remove As(III) ion from aqueous solutions. At first, graphene oxide was synthesized from graphite using a well-known Hammer method. The obtained graphene oxide solution was sprayed in octanol solution under different temperatures and sprayed speed as influenced variables. The structure and physical characterization of synthesized spherical graphene oxide were determined by various techniques, including FT-IR, N2 adsorption–desorption, SEM, TEM, and EDX. In the next step, the hydrothermal method was applied to deposition LDH on the spherical graphene oxide. The synthesized spherical graphene modified by LDH was used to remove As(III) as a toxic heavy metal ion. The effect of influenced variables including pH, contact time, amount of sorbent, and type eluent studied and the optimum values were as 8, 30, 50, and HCl (0.5 mol·L-1), respectively. After optimization, the studied sorbent was shown a high adsorption capacity (149.3 mg·g-1). The adsorption mechanism and kinetic models exhibited good agreement with the Langmuir isotherm and pseudo-second-order trends, respectively. Besides, the synthesized product was tested for seven times without significant loss in its sorption efficiency.

关键词: Graphene-based spherical adsorbent, Layered double hydroxide (LDH), Adsorption, Spray-assisted deep-frying