Enhanced removal of lead and zinc by a 3D aluminium sulphate-functionalised graphene aerogel as an effective adsorption system.

Autor: Loh NYL; Department of Chemical and Environmental Engineering, University of Nottingham Malaysia, Semenyih 43500, Selangor, Malaysia; Department of Chemical and Environmental Engineering, University of Nottingham Ningbo China, Ningbo 315100, China., Tee WT; Department of Chemical and Environmental Engineering, University of Nottingham Malaysia, Semenyih 43500, Selangor, Malaysia., Hanson S; Department of Chemical and Environmental Engineering, University of Nottingham Ningbo China, Ningbo 315100, China., Chiu WS; Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University Malaya, Kuala Lumpur 50603, Malaysia., Hiew BYZ; School of Engineering and Physical Sciences, Heriot-Watt University Malaysia, Putrajaya 62200, Malaysia., Khiew PS; Centre of Nanotechnology and Advanced Materials, Faculty of Science and Engineering, University of Nottingham Malaysia, Semenyih 43500, Selangor, Malaysia., Lee LY; Department of Chemical and Environmental Engineering, University of Nottingham Malaysia, Semenyih 43500, Selangor, Malaysia. Electronic address: lai-yee.lee@nottingham.edu.my.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2024 Aug; Vol. 362, pp. 142537. Date of Electronic Publication: 2024 Jun 04.
DOI: 10.1016/j.chemosphere.2024.142537
Abstrakt: The discharge of heavy metals into the environment has adversely affected the aquatic ecosystem due to their toxic and non-biodegradable nature. In this research, a three-dimensional graphene oxide/carboxymethylcellulose/aluminium sulphate (GOCAS) aerogel was synthesised and evaluated as a novel means for lead and zinc removal. The GOCAS aerogel was prepared via ice-templating of graphene oxide with carboxymethylcellulose and aluminium sulphate as the crosslinking and functionalisation additives. Characterisation of the aerogel by various analytical techniques confirmed the successful integration of the chemical additives. The hydroxyl and sulphate groups in the aerogel were found to participate in the adsorption of both metals. The equilibrium of lead adsorption was found to correlate well to the Freundlich isotherm, while zinc adsorption fitted closely the Langmuir isotherm. The kinetic adsorption behaviour of both metals was best described as pseudo-second-order. The interactive influences of concentration, temperature, contact time and adsorbent dose on the metal removal were explored by a central composite design, and the optimum adsorption capacity for lead was determined to be 138.7 mg/g at a GOCAS dose of 20 mg, initial concentration of 100 mg/L, temperature of 50 °C and contact time of 45 min. The optimum adsorption capacity for zinc was 52.69 mg/g at 30 mg, 65 mg/L, 45 °C and 40 min. Furthermore, regeneration studies with hydrochloric acid eluant were successfully conducted for up to four adsorption-desorption cycles. Overall, this work demonstrates that GOCAS aerogel is a viable nanosorbent for the adsorption of lead and zinc from water systems.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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