Upcycling tea waste particles into magnetic adsorbent materials for removal of Cr(VI) from aqueous solutions (Open Access)--颗粒学报PARTICUOLOGY

Wu, J., Annath, H., Chen, H., & Mangwandi, C. (2023). Upcycling tea waste particles into magnetic adsorbent materials for removal of Cr(VI) from aqueous solutions. Particuology, 80, 115-126. https://doi.org/10.1016/j.partic.2022.11.017

Upcycling tea waste particles into magnetic adsorbent materials for removal of Cr(VI) from aqueous solutions (Open Access)

Jiahong Wu ^a, Hamza Annath ^{a b}, Haili Chen ^{a c}, Chirangano Mangwandi ^a *

a School of Chemistry and Chemical Engineering, Queen’s University Belfast, David Kier Building, BT9 5AG, United Kingdom
b Department of Chemistry, University of Lancaster, Bailrigg, Lancaster, LA 4YB, United Kingdom
c College of Chemistry and Materials Engineering, Zhejiang Agriculture &Forestry University, Hangzhou, 311300, China

10.1016/j.partic.2022.11.017

Volume 80, ,, September 2023, Pages 115-126

Received 18 September 2022, Revised 22 November 2022, Accepted 27 November 2022, Available online 17 December 2022, Version of Record 1 March 2023.

E-mail: c.mangwandi@qub.ac.uk

Highlights

• Tea waste particles transformed into three types of adsorbents.

• Bleaching of the tea waste particle did not improve removal of Cr(VI).

• Combination of bleaching and thermal treatment of tea waste particle improved removal of Cr(VI).

• Processing conditions during thermal treatment affected removal capacity of the adsorbents.

Abstract

In this work, locally available tea wastes were used as precursors for the development of cost-effective bio-sorbent materials for heavy metal removal from wastewater. Chemical and thermal treatments to prepare magnetic/non-magnetic tea waste-based adsorbents were discussed and correlated their properties with corresponding Cr(VI) adsorption capacity. These bio-sorbents were thoroughly characterized by FT-IR, PXRD, N₂ adsorption-desorption surface area techniques and Cr adsorption performance was investigated in batch reactor under different conditions such as adsorbent dosage, initial Cr concentration, solution pH and contact time. Careful bleaching steps, incorporation of magnetic iron nanoparticles and judicious temperature treatments of tea wastes resulted in high performing biosorbents with a complete removal of Cr at a dosage of 0.25 g/mL of the solution. Cr adsorption on these tea waste-based bio-sorbents were found to be fitting to a pseudo 2nd order kinetics.

Graphical abstract

Keywords

Bleached-tea waste; Magnetic-tea waste; Biosorption; Chromium; Adsorption kinetics; Pyrolysis

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