Preparation Of Carboxymethylcellulose-based Hydrogel Beads And Their Used As Bioadsorbent Of Dye From Aqueous Solutions

Sodium carboxymethyl cellulose (MC)-based hydrogels beads were synthesized using sodium dodecyl sulfate (SDS) as foaming agent, NaCl as porogen agent and Al3+ as crosslinker without and in presence of diatomite (Di) as inorganic additive at various contents. The beads were by Fourier Transform Infrared spectroscopy-Attenuated transmittance spectroscopy (FTIR-ATR) and X-Ray Diffraction (XRD) analysis and Scanning Electron Microscopy (SEM). The swelling properties were investigated in deionized water. The application of CMC-based beads as biosorbents was prospected by examining the effect of Al and Di contents on the remove efficiency of Methylene Blue (MB) dye from aqueous solutions. Batch studies were conducted for various parameters: initial MB concentration, biosorbent dose, and contact time. The adsorption capacity increases as the pollutant concentration and contact time increase, and also as the biosorbent dose and crosslinker content decrease. Furthermore, the addition of inorganic Di has not improved the capacity of CMC beads. Isotherm adsorption data were modeled according to Langmuir and Freundlich models. The experimental data have the best fit to Langmuir isotherm model. The adsorption kinetics obeys well to pseudo-second-order model.