Alginate Modified Graphene Oxide for Rapid and Effective Sorption of Some Heavy Metal Ions from Aqueous Solution

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Abstract Herein, we investigated a facile strategy to modify the graphene oxide (GO) with sodium alginate (SA) through using tetraethylorthosilicate (TEOS) as binding agent. The GO-SA was highly loaded with carboxylated (-COO−Na+) groups which permitted for fast and efficient interaction with the metal ions. Therefore, the prepared composite was employed as an efficient adsorbent to uptake of some heavy metal from aqueous solution. The as-synthesized GO-SA was characterized with various advanced techniques before and after the removal process. The analysis of the experimental data showed that, the Langmuir model excellent fit the adsorption data with maximum adsorption capacities of 887.21, 161.25 and 139.62 mg g−1 for Pb2+, Zn2+ and Cd2+, respectively. Moreover, the GO-SA presented a good regeneration and reuse ability with enhancing in the removal percent for all the studied metal ions. In addition, the prepared composite showed a suitable selectivity for Pb2+ from Zn2+ and Cd2+ co-existed solution.

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