A facile approach to fabricate metal coordinated carboxylated alginic acid-based adsorbent for efficient removal of chromium(VI)

Metal carboxylated alginic acid (M-CAA) based adsorbents were prepared for the efficient removal of Cr(VI) from an aqueous solution. Batch mode adsorption studies were carried out by varying temperature, pH, initial Cr(VI) concentration, and shaking time. The fabricated adsorbents were characterized by field emission scanning electron microscopy, energy dispersive X-ray, X-ray diffraction, and Fourier transform infrared spectroscopy. Moreover, the pseudo-first-order, pseudo-second-order, Elovich, and fractional power adsorption Kinetic were applied to models in the adsorption data. The kinetics of a reaction followed the pseudo-second-order model and intra-particle diffusion pattern. The thermodynamic verified that the Cr(VI) sorption of Zr-CAA was spontaneous and endothermic. The chromium sorption capacity of fabricated Zr-CAA adsorbent material was achieved at 7.14 mg g^–1 at pH 1.