Physico-Chemical Key Parameters, Langmuir and Freundlich isotherm and Lagergren Rate Constant Studies on the removal of divalent nickel from the aqueous solutions onto powder of calcined brick

–The use of powder of calcined brick (PCB) as the low-cost adsorbents was investigated as a replacement for current costly methods of removing nickel ions from aqueous solutions. Batch adsorption studies were conducted to examine the effects of physico-chemical key parameters such as the stirring rate, initial metal ion concentration, pH, agitation time, particle size and adsorbent dosage on the adsorption of Ni(II) by powder of calcined brick powder. The optimum results were determined at an initial metal ion concentration of 50 (mg L), stirring rate = 160 rpm pH=4, agitation time – 105 min,an adsorbent dose (75 mg/50 ml) and the particle size (0.6 mm). The % adsorption, Langmuir constants [Q0=39.63(mg/g) and b=0.138(L/mg)], Freundlich constant Kf= 27.68(mg/g) and n=3.003(L/mg),Lagergren rate constants [Kad (min-1)=4.05 x 10] for [Ni (II)] 50 (mg L), were determined for the adsorption system as a function of sorbate concentration. Equilibrium data were analyzed using the Langmuir and Freundlich isotherms whereas the adsorption kinetics data were evaluated by the pseudo-first-order kinetic model. Keywords––Adsorption. Ni (II) ions. Powder of calcined brick (PCB) . Adsorption kinetics. Adsorption isotherms. Physico-chemical parameters