title: An efficient removal of RB5 from aqueous solution by adsorption onto nano-ZnO/Chitosan composite beads.
abstract: In this study, the removal of Reactive Black 5 (RB-5) by nano-ZnO/Chitosan composite beads (nano-ZnO/CT-CB) from aqueous solution was investigated. ZnO nanoparticles were prepared by the via the microwave-assisted combustion technique. And then nano-ZnO/Chitosan composite beads were prepared by polymerization in the presence of nano-ZnO and chitosan. Characterization of composite beads were conducted using SEM, TEM, FTIR, TGA and XRD. Several important parameters influencing the removal of RB 5 such as contact time, pH and temperature were investigated systematically by batch experiments. At optimum conditions of pH 4 and adsorbent concentration of 0.2g, dye removal efficiency was found 76%. Langmuir, Freundlich and Temkin adsorption models were used to describe adsorption isotherms and constants. The maximum adsorption capacity (qm) by Langmuir isotherm has been found to be 189.44mg/g. Isotherms have also been used to obtain the thermodynamic parameters such as free energy, enthalpy and entropy of adsorption. The positive value of the enthalpy change (32.7kJ/mol) indicated that the adsorption is an endothermic process. The obtained results showed that the tested adsorbents are efficient and alternate low-cost adsorbent for removal of dyes from aqueous media.
authors.affiliation: Manisa Celal Bayar University, Faculty of Science and Arts, Chemistry Department, Manisa, Turkey.
authors.forename: Seda
authors.initials: S
authors.lastname: Çınar
authors.affiliation: Manisa Celal Bayar University, Education Faculty, Primary School Science Teaching, Demirci, Manisa, Turkey.
authors.forename: Ümit H
authors.initials: ÜH
authors.lastname: Kaynar
authors.affiliation: Manisa Celal Bayar University, Faculty of Science and Arts, Chemistry Department, Manisa, Turkey. Electronic address: aydemirt@yahoo.com.
authors.forename: Tülin
authors.initials: T
authors.lastname: Aydemir
authors.affiliation: Manisa Celal Bayar University, Faculty of Science and Arts, Physics Department, Manisa, Turkey.
authors.forename: Sermin
authors.initials: S
authors.lastname: Çam Kaynar
authors.affiliation: Manisa Celal Bayar University, Faculty of Science and Arts, Physics Department, Manisa, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Ayvacıklı
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D053761:Nanocomposites / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry; D009282:Naphthalenesulfonates / Q000737:chemistry* / Q000302:isolation & purification*; D012996:Solutions; D013696:Temperature; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D004396:Coloring Agents; D009282:Naphthalenesulfonates; D012996:Solutions; D014874:Water Pollutants, Chemical; D014867:Water; D048271:Chitosan; C063421:Remazol black B; D015034:Zinc Oxide
keywords: Dye adsorption; Isotherms and thermodynamic; Nano-ZnO/Chitosan composite