title: Study of removal of Direct Yellow 12 by cadmium oxide nanowires loaded on activated carbon.
abstract: In this research, cadmium oxide nanowires loaded on activated carbon (CdO-NW-AC) has been synthesized by a simple procedure and characterized by different techniques such as XRD, SEM and UV-vis spectrometry. This new adsorbent has been efficiently utilized for the removal of the Direct Yellow 12 (DY-12) from wastewater. To obtain maximum DY-12 removal efficiency, the influences of variables such as pH, DY-12 concentration, amount of CdO-NW-AC, contact time, and temperature have been examined and optimized in a batch method. Following the variable optimization, the experimental equilibrium data (at different concentration of DY-12) was fitted to conventional isotherm models such as Langmuir, Freundlich and Tempkin. The applicability of each method is based on the R(2) and error analysis for each model. It was found that the experimental equilibrium data well fitted to the Langmuir isotherm model. The dependency of removal process to time and the experimental data follow second order kinetic model with involvement of intraparticle diffusion model. The negative value of Gibbs's free energy and positive value of adsorption enthalpy show the spontaneous and endothermic nature of adsorption process.
authors.affiliation: Chemistry Department, Yasouj University Yasouj 75914-35, Iran. m_ghaedi@mail.yu.ac.ir
authors.forename: Mehrorang
authors.initials: M
authors.lastname: Ghaedi
authors.forename: Batuol
authors.initials: B
authors.lastname: Sadeghian
authors.forename: Syamak Nasiri
authors.initials: SN
authors.lastname: Kokhdan
authors.forename: Arezou Amiri
authors.initials: AA
authors.lastname: Pebdani
authors.forename: Reza
authors.initials: R
authors.lastname: Sahraei
authors.forename: Ali
authors.initials: A
authors.lastname: Daneshfar
authors.forename: Asma
authors.initials: A
authors.lastname: Mihandoost
mesh_terms: D000042:Absorption; D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry / Q000302:isolation & purification*; D001557:Benzenesulfonates / Q000737:chemistry / Q000302:isolation & purification*; D019187:Cadmium Compounds / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D053770:Nanowires / Q000737:chemistry* / Q000648:ultrastructure; D009994:Osmolar Concentration; D010087:Oxides / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D019187:Cadmium Compounds; D004396:Coloring Agents; D010087:Oxides; C029663:cadmium oxide; C481453:direct yellow-12; D002606:Charcoal