title: Efficiency and chemical recycling capability of magnetite-rich clay towards Eriochrome Black T remediation in the fixed-bed system.
abstract: The present study investigates a fixed-bed column by using magnetite-rich clay from Cameroon as an adsorbent for the removal of the Eriochrome Black T (EBT) from aqueous solution. The effect of various parameters such as bed depths and EBT concentrations was investigated. The Adams-Bohart, Thomas and Yoon-Nelson models were applied to adsorption under varying experimental conditions to predict the breakthrough curves and to evaluate the model parameters of the fixed-bed column that can be useful for the process design. The column regeneration studies were carried out for three different sorption-desorption cycles using HCl or NaOH solution at 1 M. The 1 M HCl solution was found to have the best bed regeneration capacity and the fixed-bed could be reused for several sorption-desorption cycles. The elution efficiency of EBT, 75 mg L(-1) was greater than 99.1% for all three cycles.
authors.affiliation: a Laboratoire de physico-chimie des matériaux minéraux, département de chimie inorganique , Université de Yaoundé I ., B. P. 812 Yaoundé , Cameroun.
authors.forename: Paul
authors.initials: P
authors.lastname: Djomgoue
authors.forename: Emmanuel Djoufac
authors.initials: ED
authors.lastname: Woumfo
authors.forename: Astride Lorette
authors.initials: AL
authors.lastname: Kammoe
authors.forename: Jean Mermoz
authors.initials: JM
authors.lastname: Siewe
authors.forename: Daniel
authors.initials: D
authors.lastname: Njopwouo
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D001391:Azo Compounds / Q000737:chemistry* / Q000302:isolation & purification*; D000077215:Clay; D003198:Computer Simulation; D052918:Environmental Restoration and Remediation / Q000379:methods*; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D008956:Models, Chemical; D059027:Recycling / Q000379:methods*; D014462:Ultrafiltration / Q000379:methods
chemical_list: D000538:Aluminum Silicates; D001391:Azo Compounds; C039986:eriochrome black A; D000077215:Clay; D052203:Ferrosoferric Oxide
keywords: adsorption; clay; column; dyes; recycling