Title: Food dye adsorption by using ultrasound treated chitosan/bentonite composite film

Authors: Chin Hong Geow; Mei Ching Tan

Addresses: Department of Chemical and Petroleum Engineering, Faculty of Engineering, Technology and Built Environment, UCSI University, 56000 Cheras Kuala Lumpur, Malaysia ' Department of Chemical and Petroleum Engineering, Faculty of Engineering, Technology and Built Environment, UCSI University, 56000 Cheras Kuala Lumpur, Malaysia

Abstract: Sunset yellow food dye was removed from aqueous solution by using ultrasound treated chitosan/bentonite composite. The effects of ultrasound power, dye solution pH, initial dye concentration and adsorbent dosage were studied. The percentage of dye removal was 92.56% at optimum conditions of composite developed with 40% of ultrasound power treatment, 5 mg/L of initial dye concentration solution at pH 4.09 and 40.9 mg of adsorbent dosage. The kinetic and equilibrium data of the adsorption followed pseudo-second-order and Langmuir isotherm. The maximum monolayer adsorption capacity was found to be 43.01 mg/g, 61.92 mg/g and 51.32 mg/g respectively for 40%, 60% and 80% ultrasound power treated composite at original dye pH. The composite could be reused for two adsorption-desorption cycles.

Keywords: ultrasound; adsorption; chitosan; bentonite; food dye.

DOI: 10.1504/IJEWM.2023.130724

International Journal of Environment and Waste Management, 2023 Vol.31 No.3, pp.357 - 373

Received: 18 Nov 2019
Accepted: 02 Aug 2020
Published online: 04 May 2023 *

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