- Title
- Facile one pot preparation of magnetic chitosan-palygorskite nanocomposite for efficient removal of lead from water
- Creator
- Rusmin, Ruhaida; Sarkar, Binoy; Mukhopadhyay, Raj; Tsuzuki, Takuya; Liu, Yanju; Naidu, Ravi
- Relation
- Journal of Colloid and Interface Science Vol. 608, p. 575-587
- Publisher Link
- http://dx.doi.org/10.1016/j.jcis.2021.09.109
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2021
- Description
- Development of polymeric magnetic adsorbents is a promising approach to obtain efficient treatment of contaminated water. However, the synthesis of magnetic composites involving multiple components frequently involves tedious preparation steps. In the present study, a magnetic chitosan-palygorskite (MCP) nanocomposite was prepared through a straight-forward one pot synthesis approach to evaluate its lead (Pb2+) removal capacity from aqueous solution. The nano-architectural and physicochemical properties of the newly-developed MCP composite were described via micro- and nano-morphological analyses, and crystallinity, surface porosity and magnetic susceptibility measurements. The MCP nanocomposite was capable to remove up to 58.5 mg Pb2+ g−1 of MCP from water with a good agreement of experimental data to the Langmuir isotherm model (R2 = 0.98). The Pb2+ adsorption process on MCP was a multistep diffusion-controlled phenomenon evidenced by the well-fitting of kinetic adsorption data to the intra-particle diffusion model (R2 = 0.96). Thermodynamic analysis suggested that the adsorption process at low Pb2+ concentration was controlled by chemisorption, whereas that at high Pb2+ concentration was dominated by physical adsorption. X-ray photoelectron and Fourier transform infrared spectroscopy results suggested that the Pb adsorption on MCP was governed by surface complexation and chemical reduction mechanisms. During regeneration, the MCP retained 82% Pb2+ adsorption capacity following four adsorption–desorption cycles with ease to recover the adsorbent using its strong magnetic property. These findings highlight the enhanced structural properties of the easily-prepared nanocomposite which holds outstanding potential to be used as an inexpensive and green adsorbent for remediating Pb2+ contaminated water.
- Subject
- adsorbent regeneration; chitosan; lead removal; magnetic nanocomposite; palygorskite; wastewater treatment; SDG 6; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1475141
- Identifier
- uon:49463
- Identifier
- ISSN:0021-9797
- Language
- eng
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