Abstract
The scope of this article is to develop composite membranes using chitosan (CS) and graphene oxide (GO) as adsorbents for the removal of inorganic pollutants such as heavy metal ions, particularly Pb2+, from aqueous solutions. GO was obtained by modified Hummers method and blended with CS solution. The introduction of ethylenediaminetetraacetic acid (EDTA) compound to CS/GO suspension lead to an increased adsorption capacity of CS/GO for the elimination of heavy metals by forming stable chelates with them. The synthesized membranes were examined by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), and the adsorption behaviour of Pb2+ from aqueous solutions using CS/EDTA/GO membranes was evaluated using inductively coupled plasma mass spectrometry (ICP-MS). The adsorption performance of Pb2+ ions was studied by monitoring the concentration of Pb2+ against the adsorption period at an initial content of the adsorbent. The maximum adsorption efficiency of Pb2+ metal ions reached 767 mg·g−1 for CS/EDTA/GO 0.1%, 889 mg·g−1 for CS/EDTA/GO 0.3%, 970 mg·g−1 for CS/EDTA, 853 mg·g−1 for CS and 1526 mg·g−1 for GO. These findings show promising potential for CS/EDTA/GO membranes as effective adsorbent materials for the removal of heavy metal ions in water.
Highlights
IntroductionIn the last several years, the presence of toxic pollutants (antibiotics, pesticides, heavy metals, etc.)in wastewater has become a concerning problem affecting the ecological environment and human health in the long term
In the last several years, the presence of toxic pollutantsin wastewater has become a concerning problem affecting the ecological environment and human health in the long term
This paper presents the characterization of CS, CS/ethylenediaminetetraacetic acid (EDTA) and chitosan/ethylenediaminetetraacetic acid (CS/EDTA)/graphene oxide (GO) membranes with 2+ ions from different of GO and their application as for and the elimination of Pb
Summary
In the last several years, the presence of toxic pollutants (antibiotics, pesticides, heavy metals, etc.)in wastewater has become a concerning problem affecting the ecological environment and human health in the long term. In the last several years, the presence of toxic pollutants (antibiotics, pesticides, heavy metals, etc.). The enhancement of heavy metal ion concentrations in potable water, surface water and ground water affect human and animal life [1]. The elimination of contaminants like inorganic metal ions from wastewater is very important, as they are encountered infertilizer, the production of different plastics, mining, metallurgy, electroplating, chemical manufacturing and so forth [2,3,4,5]. Heavy metals can have a dangerous impact on human health, even at low concentrations. Heavy metals (Cr6+ , Pb2+ , Hg2+ , etc.) are imperishable and tend to accumulate in living organisms, causing toxic effects such as high blood pressure, fatigue, irritability, increased allergic reactions and autoimmune diseases [6]. Numerous techniques are used for the removal of Materials 2020, 13, 1687; doi:10.3390/ma13071687 www.mdpi.com/journal/materials
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