Fe(III) loaded chitosan-biochar composite fibers for the removal of phosphate from water

Palansooriya, K.N. and Kim, S. and Igalavithana, A.D. and Hashimoto, Y. and Choi, Y.-E. and Mukhopadhyay, R. and Sarkar, B. and Ok, Y.S. (2021) Fe(III) loaded chitosan-biochar composite fibers for the removal of phosphate from water. Journal of Hazardous Materials, 415. ISSN 0304-3894

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Abstract

Excess phosphorous (P) in aquatic systems causes adverse environmental impacts including eutrophication. This study fabricated Fe(III) loaded chitosan-biochar composite fibers (FBC-N and FBC-C) from paper mill sludge biochar produced under N2 (BC-N) and CO2 (BC-C) conditions at 600 °C for adsorptive removal of phosphate from water. Investigations using SEM/EDX, XPS, Raman spectroscopy, and specific surface area measurement revealed the morphological and physico-chemical characteristics of the adsorbent. The Freundlich isotherm model well described the phosphate adsorption on BC-N, while the Redlich–Peterson model best fitted the data of three other adsorbents. The maximum adsorption capacities were 9.63, 8.56, 16.43, and 19.24 mg P g−1 for BC-N, BC-C, FBC-N, and FBC-C, respectively, indicating better adsorption by Fe(III) loaded chitosan-biochar composite fibers (FBCs) than pristine biochars. The pseudo-first-order kinetic model suitably explained the phosphate adsorption on BC-C and BC-N, while data of FBC-N and FBC-C followed the pseudo-second-order and Elovich model, respectively. Molecular level observations of the P K-edge XANES spectra confirmed that phosphate associated with iron (Fe) minerals (Fe-P) were the primary species in all the adsorbents. This study suggests that FBCs hold high potential as inexpensive and green adsorbents for remediating phosphate in contaminated water, and encourage resource recovery via bio-based management of hazardous waste.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Hazardous Materials
Additional Information:
This is the author’s version of a work that was accepted for publication in Journal of Hazardous Materials. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Hazardous Materials, 415, 2021 DOI: 10.1016/j.jhazmat.2021.125464
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2307
Subjects:
ID Code:
158056
Deposited By:
Deposited On:
06 Aug 2021 09:20
Refereed?:
Yes
Published?:
Published
Last Modified:
18 Oct 2021 05:10