Polyethylenimine-Modified Magnetic Chitosan for the Uptake of Arsenic from Water
Open Access
- 18 June 2021
- journal article
- research article
- Published by MDPI AG in Applied Sciences
- Vol. 11 (12), 5630
- https://doi.org/10.3390/app11125630
Abstract
The removal of heavy metals from water has become a global environmental problem. Various materials have been applied as adsorbent to remove metals from water. In this field, nanomaterials have been gaining increasing interest due to their exceptional properties. In this work, we discuss the synthesis of a core-shell structure nanocomposite by the modification of magnetic chitosan (CS) (Fe3O4/CS) with polyethylenimine (PEI) to produce Fe3O4/CS/PEI composite for the adsorption of arsenic ions (As(V) and As(III)) from aqueous solution. The synthesized materials were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM), and vibrating sample magnetometer (VSM). The results indicated the successful combination of three components of the nanocomposite. The adsorption conditions were optimized by studying the effect of different parameters included pH, contact time, initial concentration, and adsorbent dosage. The optimum adsorption pH was found to be 6.7 while the optimum adsorbent dosage was found to be 2.0 and 1.5 g/L for As(III) and As(V), respectively. The removal efficiency for the uptake of As(III) and As(V) ions over Fe3O4/CS/PEI nanocomposite at optimum conditions was found to be 99.5 and 99.7%, respectively. The experimental results were fitted using Freundlich’s and Langmuir’s isotherms. The data were more fitted to Langmuir isotherm providing a suggestion of monolayer adsorption with maximum adsorption capacity equal to 77.61 and 86.50 mg/g for the removal of As(III) and As(V), respectively. Moreover, linear regression coefficient (R2) indicated that the adsorption of arsenic ions over the synthesized magnetic nanocomposite obeyed pseudo 2nd order suggesting the chemisorption process. The reusability of the nanosorbent for arsenic uptake using sodium hydroxide as eluent was also assessed up to five cycles. Interestingly, Fe3O4/CS/PEI nanocomposite can be considered as a promising adsorbent for As ions’ removal from water and should be tested for the removal of other pollutants.Funding Information
- King Khalid University (RGP.1/111/42)
This publication has 71 references indexed in Scilit:
- Arsenic Contamination of Groundwater and Its Implications for Drinking Water Quality and Human Health in Under-Developed Countries and Remote Communities—A ReviewApplied Sciences, 2021
- The removal of arsenic and metals from highly acidic water in horizontal subsurface flow constructed wetlands with alternative supporting mediaJournal of Hazardous Materials, 2020
- Rapid adsorption of As(V) from aqueous solution by ZnO embedded in mesoporous aluminosilicate nanocomposite adsorbent: Parameter optimization, kinetic, and isotherms studiesSurfaces and Interfaces, 2020
- A review on graphene oxide and its composites preparation and their use for the removal of As3+and As5+ from water under the effect of various parameters: Application of isotherm, kinetic and thermodynamicsProcess Safety and Environmental Protection, 2018
- Magnetic iron oxide-carbon nanocomposites: Impacts of carbon coating on the As(V) adsorption and inductive heating responsesJournal of Alloys and Compounds, 2018
- Computational study on the efficiency of MoS 2 membrane for removing arsenic from contaminated waterJournal of Molecular Liquids, 2018
- Pilot study on arsenic removal from groundwater using a small-scale reverse osmosis system—Towards sustainable drinking water productionJournal of Hazardous Materials, 2016
- Global Impacts Of Geogenic Arsenic: A Medical Geology Research CaseAMBIO, 2007
- A rapid colorimetric method for measuring arsenic concentrations in groundwaterAnalytica Chimica Acta, 2004
- Marked Increase in Bladder and Lung Cancer Mortality in a Region of Northern Chile Due to Arsenic in Drinking WaterAmerican Journal of Epidemiology, 1998