Single-step pyrolysis of phosphoric acid-activated chitin for efficient adsorption of cephalexin antibiotic. (May 2019)

• Record Type: Journal Article
• Authors: Khanday, W.A.; Ahmed, M.J.; Okoye, P.U.; Hummadi, Esam H.; Hameed, B.H.
• Is Part Of: Bioresource technology. Volume 280(2019)
• Page Start: 255
• Page End: 259
• Publication Date: 2019-05
• Subjects: Chitin -- Pyrolysis -- Activated carbon -- Adsorption -- Antibiotics; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.02.003
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Chitin–AC adsorbent was prepared by H3 PO4 activation. The performance of the adsorbent for cephalexin removal was evaluated. The adsorption behavior of the studied system was identified and analyzed. The maximum capacity of 245.19 mg/g was obtained at 50 °C. Abstract: Cephalexin (CFX) antibiotic, a potent pharmaceutical water pollutant, was efficiently removed by activated carbon (AC) derived from a single-step pyrolysis of phosphoric acid-activated chitin. Experimental conditions such as temperature, CFX initial concentration, and solution pH were screened in batch adsorption. Phosphoric acid activation of chitin and subsequent pyrolysis tailored the Brunauer–Emmett–Teller surface area, total pore volume, and average pore diameter to 1199.02 m 2 /g, 0.641 cm 3 /g, and 21.37 Å, respectively. The Langmuir isotherm adequately described the equilibrium data for CFX adsorption on chitin–AC, with an R 2 of 0.99 and a monolayer capacity of 245.19 mg/g at 50 °C. Chitin–AC showed higher adsorption capacity compared with other ACs derived from industrial and agricultural precursors. When activated by phosphoric acid, chitin–AC featured functional multi-sites for vast antibiotic adsorption treatment. Overall, chitin–AC could be a promising adsorbent for removal of CFX.