Graphene oxide based carbon composite as adsorbent for Hg removal:Preparation, characterization, kinetics and isotherm studies

doi:10.1016/j.cjche.2017.02.006

Abstract

Abstract: The presence of Hg in the aqueous media is known to cause severe health issues in both humans and animals. Many technologies and especially adsorbents have been applied for its removal. In this study, a graphene oxide-carbon composite (GO-CC) as a new adsorbent was prepared by sol gel procedure and characterized using field emission scanning electron microscopy, BET and EDX. The effects of different variables including solution pH, contact time, adsorbent dose and GO ratio in adsorbent matrix on the removal capacity of Hg were studied. The isotherm data correlated well with the Langmuir isotherm model. Further analysis recommended that the Hg²⁺ adsorption process is governed by the intra-particle and external mass transfer, in which the film diffusion was the rate restrictive step. The presented composite has maximum absorption capacity, q_max of 68.8 mg·g^-1, which is comparable with carbon based adsorbent reported in the previous publications.

Key words: Adsorbent, Mercury removal, Sol gel, Carbon composite

摘要： The presence of Hg in the aqueous media is known to cause severe health issues in both humans and animals. Many technologies and especially adsorbents have been applied for its removal. In this study, a graphene oxide-carbon composite (GO-CC) as a new adsorbent was prepared by sol gel procedure and characterized using field emission scanning electron microscopy, BET and EDX. The effects of different variables including solution pH, contact time, adsorbent dose and GO ratio in adsorbent matrix on the removal capacity of Hg were studied. The isotherm data correlated well with the Langmuir isotherm model. Further analysis recommended that the Hg²⁺ adsorption process is governed by the intra-particle and external mass transfer, in which the film diffusion was the rate restrictive step. The presented composite has maximum absorption capacity, q_max of 68.8 mg·g^-1, which is comparable with carbon based adsorbent reported in the previous publications.

关键词: Adsorbent, Mercury removal, Sol gel, Carbon composite

Tayebeh Esfandiyari, Navid Nasirizadeh, Mohammad Dehghani, Mohammad Hassan Ehrampoosh. Graphene oxide based carbon composite as adsorbent for Hg removal:Preparation, characterization, kinetics and isotherm studies[J]. , 2017, 25(9): 1170-1175.

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