Calcined ZnAl-LDH trapping performance in alginate beads for adsorption of Congo Red dye

In this study, we report the adsorption process of Congo Red (CR) dye by calcined Layered Double Hydroxide (ZAC) at 550°C. The urea hydrolysis method was applied to produce highly crystalline Zn2Al-LDH. Samples characterisation carried out X-ray diffraction (XRD), Thermogravimetric/differential thermal analysis (TG/DTA), and Fourier transform infrared spectroscopy (FTIR). results show that CR on ZnAl-LDH accompanied reconstruction layered structure. ZAC showed higher efficiency versus other adsorbent under investigation optimum conditions contact time, dose, pH temperature were found be 50 min, 0.02 g, 7 318 K, respectively. Isotherm studies Langmuir isotherm model appropriate describe data compared with Freundlich Temkin models, a correlation coefficient (R2 > 0.99) maximum capacity 406.5 mg/g. thermodynamic parameters revealed spontaneous, endothermic, governed chemisorption. To further facilitate recovery in adsorption, test feasibility applying its product 550°C entrapped alginate beads. Experimental indicate alginate-coated beads, which exhibited remarkable performance, more stable require less effort pull separate than alginate/ZnAl-LDH composite