title: Cadmium hydroxide nanowire loaded on activated carbon as efficient adsorbent for removal of Bromocresol Green.
abstract: In the present research, cadmium hydroxide nanowire loaded on activated carbon (Cd(OH)(2)-NW-AC) was synthesized and characterized. This new adsorbent was applied for the removal of Bromocresol Green (BCG) molecules from aqueous solutions. The influence of effective variables such as solution pH, contact time, initial BCG concentration, amount of Cd(OH)(2)-NW-AC and temperature on the adsorption efficiency of BCG in batch system was examined. During all experiments BCG contents were determined by UV-Vis spectrophotometer. Fitting the experimental data to different kinetic models including pseudo-first-order, pseudo-second-order, Elovich and intra-particle diffusion kinetic models show the suitability of the pseudo-second-order kinetic model to interpret in the experimental data. Equilibrium isotherm studies were examined by application of different conventional models such as Langmuir, Freundlich and Tempkin models to explain the experimental data. Based on considering R(2) value as criterion the adsorption data well fitted to Langmuir model with maximum adsorption capacity of 108.7 mg g(-1). Thermodynamic parameters (Gibb's free energy, entropy and enthalpy) of adsorption were calculated according to general procedure to take some information about the on-going adsorption process. The high negative value of Gibb's free energy and positive value of enthalpy show the feasibility and endothermic nature of adsorption process.
authors: Chemistry Department, Yasouj University, Yasouj 75914-35, Iran. m_ghaedi@mail.yu.ac.ir
authors: Mehrorang
authors: M
authors: Ghaedi
authors: Habibollah
authors: H
authors: Khajesharifi
authors: Amin
authors: A
authors: Hemmati Yadkuri
authors: Mostafa
authors: M
authors: Roosta
authors: Reza
authors: R
authors: Sahraei
authors: Ali
authors: A
authors: Daneshfar
mesh_terms: D000327:Adsorption; D001961:Bromcresol Green / Q000737:chemistry / Q000302:isolation & purification*; D002104:Cadmium / Q000737:chemistry*; D019187:Cadmium Compounds / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D053770:Nanowires / Q000737:chemistry* / Q000648:ultrastructure; D013057:Spectrum Analysis; D013696:Temperature; D013997:Time Factors
chemical_list: D019187:Cadmium Compounds; D004396:Coloring Agents; D002104:Cadmium; D002606:Charcoal; D001961:Bromcresol Green