Preparation, characterization and application of synthesized thiourea formaldehyde-calcium alginate in removing of Reactive black 5

Thiourea formaldehyde calcium alginate (TFCA) composite was successfully synthesized and used for removal of Reactive black 5 dye. The synthesized composite was applied and characterized by Fourier transform infrared spectrometer (FT-IR) spectra, scanning electron microscope (SEM)/EDS, Energy Dispersive X-Ray Analysis (EDX) and X-ray diffraction (XRD). SEM and EDX analyses confirm the homogeneity of the sorbent in term of composition. Batch adsorption experiments were performed to evaluate the adsorption conditions such as pH value, dye concentration, contact time, temperature and sorbent dose, as well as the ionic strength effect. Experimental data have been modeled by using Langmuir, Freundlich, Dubinin Radushkevich (D–R) and Temkin isotherms. Kinetic adsorption data modeled using PFORE, PSORE, Morris Weber and Elovich. Thermodynamic parameters (ΔG, ΔH, and ΔS) were evaluated for the dye adsorbent systems. These data indicated an exothermic spontaneous adsorption process that kinetically followed the pseudo-second-order adsorption process, Removal of Reactive Black 5 (RB5) dye from aqueous solution the results showed that the maximum adsorption capacity was 0.02 mmol. g-1, observed at pH 1 and temperature 25 ◦C. Equilibrium adsorption was achieved within 60 min.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author

Magnetic alginate beads with high basic dye removal potential and excellent regeneration ability

The adsorption of crystal violet dye (CV) onto magnetic alginate composite (MAlg) from aqueous solutions was studied. Experiments were carried out as function of contact time, dosage, temperature, pH and CV concentration in the solutions. Optimum CV uptake was observed at equilibrium pH 7 and most of the CV was sorbed within 30 min. The equilibrium adsorption data were analyzed using two common adsorption models: Langmuir and Freundlich. The results revealed that Langmuir isotherm fit the experimental results well. The maximum adsorption capacity obtained from Langmuir isotherm equation was 0.113 mmol g−1 at 298±1 K. The kinetics adsorption of CV onto MAlg composite was investigated using the pseudo first order and pseudo second order kinetic models. The results showed that the adsorption of CV onto MAlg composite followed pseudo second order kinetic model. Thermodynamic data indicated that adsorption process is endothermic and spontaneous reaction. Due to their outstanding adsorption capacities, MAlg composite is an excellent adsorbent for the removal of CV. The Composite regeneration was greater than 98.6% with 0.01 M HCl, and MAlg composite could be repeatedly utilized for CV removal with negligible loss in sorption capacity.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author