Thermodynamics and kinetics of bivalent cadmium biosorption onto nanoparticles of chitosan-based biopolymers

Facile synthesis of chitosan derivatives and Arthrobacter sp. biomass for the removal of europium(III) ions from aqueous solution through biosorption

“…The natural biopolymer chitosan is an industrially attractive biopolymer that can be used as a biosorbent for the effective removal of heavy metals from aqueous solutions (Popuri et al, 2007;Shaker, 2015;Wang and Chen, 2014;Wangpradit and Chitprasert, 2014). In the world crustaceans such as, crabs, crayfish, lobsters, prawns, shrimp etc., are popular delicacies and generate a large amount of its exoskeleton waste containing chitin.…”

Adsorption of Co(II), Ni(II) and Cu(II) ions onto chitosan-modified poly(methacrylate) nanoparticles: Dynamics, equilibrium and thermodynamics studies

“…Eq. (6) may be used to express the essential characteristics of Langmuir isotherm [5][6][7][8][9][10][11]24]. The R L value indicates the adsorption nature to be unfavourable (R L > 1), linear (R L = 1), favourable (0 < R L < 1) and irreversible (R L = 0).…”

“…(9) used to evaluate the variation of equilibrium constant with temperature determines the thermodynamic parameters for adsorption processes. (9) where K i (L/mol) is the conditional equilibrium constant, …”

“…Therefore, it is necessary to efficiently remove toxic metal ions from wastewaters before their release in the environment. Numerous physical, chemical and biological [3] treatment technologies have been reported for the removal of toxic metal ions such as chemical precipitation [4], adsorption [5][6][7][8][9][10], ion-exchange [11], electro coagulation [12] and membrane separation [13]. However, among those technologies, the adsorption technique has been found to be the best technology for toxic metals removal because of its high effectiveness, ease of operation, low operating cost, no generated poisonous byproducts and possible regeneration of adsorbents.…”

“…If CS were to be used as efficient adsorbent it is essential to be chemically modified so as to solubilize its crystalline parts and make its ligating groups available for metal chelation. Chemical modification resulting in the formation of chitosan-based nanomaterials is anticipated to be promising because it can provide access to a wide variety of novel hybrid materials with superior adsorptive properties [9]. In this study, we report the synthesis of novel nanoparticles, CMA made of CS and methacrylic acid, MA by polymerization reaction that can easily adsorb Co(II), Ni(II) and Cu(II) ions from aqueous solution with high removal efficiency.…”