Magnetic chitosan grafted with polymerized thiourea for remazol brilliant blue R recovery: Effects of uptake conditions. Issue 7 (3rd July 2017)

• Record Type: Journal Article
• Authors: Elwakeel, K. Z.; El-Bindary, A. A.; Ismail, A.; Morshidy, A. M.
• Is Part Of: Journal of dispersion science and technology. Volume 38:Issue 7(2017)
• Page Start: 943
• Page End: 952
• Publication Date: 2017-07-03
• Subjects: Glutaraldehyde -- magnetic sorbent -- polymerized thiourea -- RBBR sorption; Emulsions -- Periodicals; Suspensions (Chemistry) -- Periodicals; Emulsions; Suspensions; 541.34
• DOI: 10.1080/01932691.2016.1216436
• Languages: English
• ISSNs: 0193-2691

Abstract

ABSTRACT: Magnetic chitosan was prepared by co-precipitation with polymeric Schiff's base resulting from the reaction of thiourea with glutaraldehyde. This material has great potential as high-effective sorbent for Remazol Brilliant Blue R (RBBR): maximum sorption capacity reached 0.441 mmol g −1 at pH 1.6 and at 25°C. Kinetic plots, pH dependence, isotherm data, and influences of ionic strength were reported. The data from equilibrium sorption experiments are well fitted to the Langmuir isotherm and the pseudo-second-order sorption kinetics indicates that chemisorption controls the process. The distribution coefficient was calculated at different temperatures and the thermodynamic parameters have been calculated: the sorption reaction is endothermic, spontaneous, and increases the entropy of the system. Alkaline solution (0.5 M NaOH) was used for desorbing RBBR from loaded sorbent. The sorbent exhibited good regenerability over several repeated adsorption/desorption cycles. GRAPHICAL ABSTRACT: