Adsorption and separation of Cs(I) and Ba(II) from aqueous solution using zinc ferrite-humic acid nanocomposite.

Reclaimable adsorbents have an essential role in removing radionuclides from waste streams. Herein, zinc ferrite-humic acid ZFO/HA nanocomposite was synthesized for effective cesium and barium adsorption. The prepared ZFO/HA nanocomposite was analyzed using analytical techniques including XRD, FTIR, EDX, and SEM. From kinetic studies, the mechanism adsorption process follows the second model. The isotherm studies clarified that the Langmuir model fit the adsorption of both ions onto the prepared sample, and the monolayer capacities are equal to 63.33 mg/g and 42.55 mg/g for Ba(II) and Cs(I), respectively. The temperature parameter was also studied, and the adsorption reaction was spontaneous and endothermic. The maximum separation between two ions was achieved at pH 5 (αCs/Ba = 3.3).

Taguchi L16 optimization approach for simultaneous removal of Cs+ and Sr2+ ions by a novel scavenger.

This study targeted to investigate the efficacy of a novel nano 2-naphtyl amine6:6-azulene sodium methanesulfonate di sulphonic acid-impregnated zeolite scavenger for simultaneous elimination of Cs+ and Sr2+ ions from binary aqueous systems. Fractal analysis is introduced to assign a fractal dimension and other fractal characteristics necessary for the surface characterization in terms of fractal dimension (Ds) and pre-exponential coefficient (C), which, in theory, are independent tool and sole for each surface. It is found that the Ds value of nano 2-naphtyl amine6:6-azulene sodium methanesulfonate di sulphonic acid-impregnated zeolite of type Y (NAASMS-ZY) is higher than that of nano 2-naphtyl amine6:6-azulene sodium methanesulfonate di sulphonic acid-impregnated zeolite of type X (NAASMS-ZX) and nano 2-naphtyl amine6:6-azulene sodium methanesulfonate di sulphonic acid-impregnated zeolite of type A (NAASMS-ZA) which accordingly, suggests the irregularity of NAASMS-ZY surface and thus demonstrates a large surface area. To increase the scavenge efficacy, effecting parameters on scavenge process were investigated and optimized via the use of adopting Taguchi L16 design of experiments approach. It is found that, the initial metal ions concentration is the most powerful variable, and its value of contribution percentage is up to 33% and 31% for Cs+ and Sr2+, respectively. The kinetic curves and sorption isotherms at 298, 303 and 313 K were obtained, which well fitted to hyperbolic and Langmuir equations, respectively. Thermodynamic parameters demonstrated that the scavenge process was endothermic for both the concerned ions. Our results showed that the novel synthesized NAASMS-ZY is an effective nano-scavenger for cesium and strontium decontamination.

Sorption potential of impregnated charcoal for removal of heavy metals from phosphoric acid.

The viability of some heavy ions removal from phosphoric acid solution by means of impregnated charcoal with triphenylphosphine sulphide extractant has been demonstrated in this work. Factors affecting removal of Cu(2+), Cd(2+), Zn(2+)and Pb(2+) include initial concentration of ions, volume of the aqueous solution to weight of adsorbent ratio (V/m), concentration of the extractant loaded onto charcoal and temperature. The removal percent of these ions is increased by decreasing values of V/m ratio and increasing temperature for all ions. The sorption isotherms data fit Langmuir, Freundlich and Dubinin-Radushkviech (D-R) models. The values of the mean free energy, E(a), of sorption is in all cases in the range 9.1-25.6 kJ/mol, which are within the ranges of chemical sorption reaction. The sorption reaction was found to obey a pseudo second-order rate model.