To investigate template effect on physicochemical properties of zeolite and enhance the molecular sieving properties, adsorption of methionine amino acid was studied by spectroscopic methods. Four zeolites such as methionine templated analcime, methionine templated zeolite P, N, N-dibenzyl N,N,N,N-tetramethylethylenediamine (DBTMED) templated analcime and free template analcime were synthesized as adsorbents and characterized with scanning electron microscopy (SEM), Fourier transformation infrared spectroscopy (FTIR) and N2 adsorptiondesorption analyses. The influence of methionine concentration and pH on the adsorption ability of zeolites was examined; furthermore, the adsorption isotherms of methionine on zeolites were studied and the experimental data were fitted with Freundlich and Langmuir equations in order to obtain sorption parameters.The results indicated that the adsorption of amino acid was not only depended on zeolites surface areas but also on their pore size. The existence of template in zeolite synthesis could help enlarging the pore size and enhancing the adsorption ability. پرونده مقاله

Nickel (Ni) as a heavy metal due to its toxicity should be removed from wastewater and aquatic environments using efficient technology. The aim of this study was to remove Ni from an aqueous solution using palm leaf ash produced in a furnace. To do so, kinetic and thermodynamic experiments were conducted on the adsorption process. Moreover, the effect of time, pH, adsorbent and initial concentration of Ni was studied on Ni adsorption. The results of the experiment indicated that the Ni adsorption process followed the Freundlich isotherm model. The study of kinetic data also displayed the removal of Ni ions from the pseudo-second-order kinetics. The results showed that the percentage removal of Ni (II) and maximum adsorption capacity of an adsorbent for Ni (II) ions were 94.67% and 40.81 mgg-1, respectively. Furthermore, the enthalpy of the adsorption process (ΔH) was 62706.8 j.mol-1. پرونده مقاله