title: Adsorption characteristics of Congo Red onto the chitosan/montmorillonite nanocomposite.
abstract: A series of biopolymer chitosan/montmorillonite (CTS/MMT) nanocomposites were prepared by controlling the molar ratio of chitosan (CTS) and montmorillonite (MMT). The nanocomposites were characterized by FTIR and XRD. The effects of different molar ratios of CTS and MMT, initial pH value of the dye solution and temperature on adsorption capacities of samples for Congo Red (CR) dye have been investigated. The adsorption capacities of CTS, MMT and CTS/MMT nanocomposite with CTS to MMT molar ratio of 5:1 for CR were compared. The results indicated that the adsorption capacity of CTS/MMT nanocomposite was higher than the mean values of those of CTS and MMT. The adsorption kinetics and isotherms were also studied. It was shown that all the sorption processes were better fitted by pseudo-second-order equation and the Langmuir equation.
authors.affiliation: Center of Eco-material and Green Chemistry, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Aiqin
authors.initials: A
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D003224:Congo Red / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007700:Kinetics; D053761:Nanocomposites / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D004396:Coloring Agents; D007220:Industrial Waste; D001546:Bentonite; D003224:Congo Red; D048271:Chitosan