Current Issue

Advanced Materials and Technologies Environmental Sciences – AdvMatTechEnv 2018; Vol 2; Issue 2 is now being populated with papers. Thank you for all the contributors and reviewers.

The adsorption of sodium ions onto Amberjet 1500H synthetic ion exchange resin was studied. The study was conducted by a batch method to determine equilibrium and kinetic studies using synthetic solution of 5.3 pH and Na concentration ranged from 10 to 20 mg/L. The experimental isotherm data were analyzed using Temkin and Dubinin-Radushkevich equations. Adsorption kinetics data were tested using pseudo first order, pseudo second order and intraparticle diffusion models. Kinetic studies showed that the adsorption followed a pseudo-second-order reaction. The initial separation rate, pseudo first order, pseudo second order and intraparticle diffusion rate constants for different initial concentrations were evaluated and discussed. Based on the adsorption isotherm studies the uptake capacity and the adsorbate/adsorbate interaction of Na+ ions on 1500H are small, its due to the low affinity of sodium ions for adsorbed with cation resin. For all the system studied, chemical reaction seems significant in the rate-controlling step and the pseudo-second-order chemical reaction kinetics provide the best correlation of the experimental data for 1500H.  

Effects of Na131I and UO2(NO3)2 on Vibrio Qinghaiensis sp. Q67 (a freshwater luminescent bacterium) were studied in the paper. Relative luminosity (Irel) was used as the tested physiological parameter. About Na131I solution, Four radioactive concentrations were designed. Irel was fluctuated as the activity under 1000Bq/ml and varied irregularly, while three successive stages in the bioluminescent response to Na131I at the activity over 5000Bq/ml were found: initial stage (stress recognition), hormesis stage (adaptive response) and inhibition stage (radiation toxicity). While to UO2(NO3)2, bioluminescence inhibition was observed under uranyl concentrations exceeding 0.05 ppm and for each concentration, Irel was approximate linear decrease over the exposure time. Furthermore, chosen the  Irel at exposure 15min (Irel, 15) as the study target, a linear relationship was observed between Irel, 15 and the concentration of uranium from 0.05 to 1ppm. The main toxic factor was chemical component, not radiation.