Abstract
Magnetic nanocomposites have received immense interest as adsorbents for water decontamination. This paper presents adsorptive properties of nitrogen-doped graphene oxide (N-GO) with magnesium ferrite (MgFe2O4) magnetic nanocomposite for removing lead(II) (Pb(II)and arsenite As(III) ions. Transmission electron microscope (TEM) image of synthesized nanocomposite revealed the wrinkled sheets of N-GO containing MgFe2O4 nanoparticles (NPs) with particle size of 5-15nm distributed over its surface. This nanocomposite displayed higher BET surface area (72.2 m2g-1) than that of pristine MgFe2O4 NPs (38.4 m2g-1). Adsorption on the nanocomposite could be described by the Langmuir isotherm with the maximum adsorption capacities were 930mg/g, and 64.1mg/g for Pb(II) and As(III), respectively. Whereas, maximum removal efficiencies were observed to be 99.7 [Formula: see text] 0.2% and 93.5 [Formula: see text] 0.1% for Pb(II) and As(III), respectively. The study on the effect of coexisting anions on the adsorption of metal ions showed that the phosphate ions were potential competitors of Pb(II) and As(III) ions to adsorb on the nanocomposite. Significantly, the investigation on adsorption of metal ion in the presence of coexisting heavy metal ions indicated the preferential adsorption of Pb(II) ions as compared to Cd(II), Zn(II) and Ni(II) ions. The effectiveness of the nanocomposite to remove the metal ions in electroplating wastewater was demonstrated.
Highlights
The contamination of surface and ground water is a major threat to public health
The internal and external coupling of N-graphene oxide (GO) sheets was perceived to produce microwrinkling, which could increase the number of layers and length of the layered structure upon nitrogen doping, observed previously in the TEM image of N-GO (Fig. 1b) ( (Alyaa et al 2016)). MgFe2O4 NPs displayed agglomeration in TEM images which is a characteristic of magnetic NPs with the particle size ranging from 5 to 15 nm (Fig. 1c)
In case of nanocomposite, wrinkled sheets of N-GO contained the MgFe2O4 NPs distributed over their surface (Fig. 1d)
Summary
The contamination of surface and ground water is a major threat to public health. Based on the guidelines of Responsible Editor: Tito Roberto Cadaval Jr the World Health Organization (WHO), lead (Pb) and arsenic (As) are categorized among the priority hazardous substances when their concentrations in water exceeds 50 μg/L and 10 μg/L, respectively ( (Ghasemabadi et al 2018); (Shaji et al 2021)). Contamination of Pb(II) ions mainly arises from the effluent wastes from industries such as mining, galvanization, smelting, and battery manufacturing. The presence of Pb(II) ions in water could increase the health risk of high blood pressure, kidney damage, abdominal cramps and headache ( (Zou et al 2019)). Acute toxicity of As(III) is associated with abdominal pain, heart disease and diarrhea. Chronic exposure to As(III) can lead to multisystem failure ( (Salih et al 2019))
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