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Preparation of κ-carrageenan/graphene oxide gel beads and their efficient adsorption for methylene blue. | LitMetric

Preparation of κ-carrageenan/graphene oxide gel beads and their efficient adsorption for methylene blue.

J Colloid Interface Sci

Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, PR China. Electronic address:

Published: November 2017

AI Article Synopsis

  • - A new type of eco-friendly adsorbent was created using κ-carrageenan and graphene oxide, known as κ-Car/GO gel bead adsorbents, designed for removing dye pollutants from water.
  • - Various methods were used to analyze the composition and structure of these gel beads, and their effectiveness in absorbing methylene blue dye was tested under different conditions, revealing a high maximum adsorption capacity.
  • - The adsorbents not only showed excellent removal capabilities but also retained their performance after multiple uses, and they can be easily separated from solutions through simple filtration.

Article Abstract

A series of environmental-friendly adsorbents, κ-carrageenan/graphene oxide gel beads (κ-Car/GO GBs), were synthesized from κ-carrageenan and graphene oxide via a simple method. The composition and morphology of these gel bead adsorbents were characterized by Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, scanning electron microscopy, etc. The adsorption ability of κ-Car/GO GBs was investigated by measuring the removal of methylene blue (MB) from aqueous solutions. The effects of the initial dye concentration, adsorption time, temperature and pH value were evaluated. The results of the adsorption experiments were consistent with the Langmuir model, while the adsorption kinetic data were fit with a pseudo-second-order model. The maximum adsorption capacity of κ-Car/GO GBs for MB is 658.4mg/g at 25°C, which barely declined even after five cycles. Hence, the κ-Car/GO GBs are outstanding adsorbents with high adsorption capacity and excellent regeneration ability. Furthermore, the gel bead adsorbents could be easily separated from aqueous solutions after adsorption using a simple filtration method.

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Source
http://dx.doi.org/10.1016/j.jcis.2017.07.093DOI Listing

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