Production of Biosorbent Based on Walnut Shell and Polystyrene Waste for Iodine Adsorption from Aqueous Solution

Articles in Press

Document Type : Original Article

Authors

1 Faculty member

2 B. Sc. in Chemical Engineering, Ferdowsi University of Mashhad

10.22034/ijche.2024.430901.1378

Abstract

Water contamination is one of the biggest problems threatening human life and environment by the growth of various industries. For this reason, it is necessary to remove pollutants such as iodine from contaminated water. The aim of this study is to adsorb iodine from aqueous solution using adsorbents prepared from walnut shell (WS) and polystyrene waste (PS). In this study, simultaneous utilization of WS and PS resulted in the production of biosorbents such as WS, WS biochar (WAC), and WAC co-pyrolyzed with polystyrene waste (WACPS). Adsorption capacity, adsorption percentage, and the effect of initial concentration of iodine aqueous solution were investigated. WAC and WACPS showed a better performance as compared to WS with the adsorption percentage of 80 and 65%, and the adsorption capacity of 508 and 413 mg/g, respectively, in the initial concentration of 12700 mg/L. The reusability of WAC was demonstrated by a performance reduction of about 15% after five regeneration cycles. Freundlich and Langmuir isotherms were able to accurately predict iodine adsorption. Adsorption thermodynamics proved that the iodine adsorption was spontaneous and endothermic. SEM showed that the more the porous surface and holes of adsorbent, the higher the adsorption percentage. As BET, the diameter of pores and adsorption surface of WAC were obtained as 36.06 nm and 2.99 m2/g, respectively. FTIR proved adsorbent production and iodine adsorption on it as changes in bonds. The use of agricultural and plastic waste to produce porous carbon adsorbents leads to solid waste management,, and environmental health by wastewaters treatment.

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Iranian Chemical Engineering Journal

Articles in Press, Accepted Manuscript
Available Online from 14 February 2024

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