Microprecipitation occurs at high pH (>9) when using NaOH as an eluent. Desorption of Cd(II) and the regeneration of the biomass is effectively achieved with HCl (10 mM) and EDTA (1 mM), but they can only be used for two cycles, before the efficiency decreases. Quantitatively the bio sorbent has an increasing uptake capacity (more than two folds) in the second cycle, after metal elution and biomass surface sites functioning. Cd maximum uptake capacity (i.e., 1.203 mmol Cd g−1 dried algae) in first adsorption cycle show superior uptake as opposed to other species. Effective Cd(II) adsorption is achieved at pH conditions between 5 and 7, at which the uptake occurs rapidly (∼2 h), with increasing Cd(II) concentration. Our results demonstrate that Cd(II) is adsorbed on the algal surface based on carboxylic of alginate groups. This work takes a comprehensive approach involving the combination of qualitative and quantitative information collected from macro to atomistic scale, in a direct and non-destructive manner. Looking for new green and environmentally friendly bio sorbents for metal removal from polluted wastewater, the present study investigates the potential new bio sorbent for Cd(II) removal from wastewater namely, the mechanism and uptake capacity of Cd(II) by brown algae, Fucus vesiculosus from the Irish Sea. These issues include the solvent effects which are not properly modeled, the calculation of adsorption energy which is not taking the environment into account, and possibly the temperature effects. Although some studies have been reported on molecular modeling of aniline adsorption using a different range of computational approaches, there are still a lot of issues to be addressed. Most of the time they are simulated in the gas phase, but for a realistic adsorption model, they should be simulated in the solvent phase. Different potential adsorbents have been examined through simulations, usually using density functional theory (DFT) or ab-initio method. Aniline uptake best-fit both the Langmuir and Freundlich isotherm models as well as a pseudo second order kinetic model. In terms of factors that affect the efficiency of adsorbents, temperature seems to be the most influential. It was observed from the review that an Azo-linked porous organic polymer (AZO-POP-1) is the best adsorbents for the removal of aniline from aqueous media, with a capacity adsorption (qmax) of 1059 mg/g. This review aims to report the efficiency of the adsorption of industrial pollutants, aniline, from wastewater. © 2016, Mazandaran University of Medical Sciences.
Conclusion: MGO NPs have extended capabilities such as easy and rapid separation from sample and high potential in removing 2,4 dichlorophenol, so, it can be introduced as an appropriate adsorbent for removal of this pollutant from water and wastewater. The thermodynamic parameters showed that the adsorption process was endothermic (ΔG= 57.7 to 119.15) and spontaneous (ΔG= -1.15 to -9.44). Langmuir isotherm (R²=0.9987) and pseudo-second-order (R²=0.9992) models were proved to be the best in describing the adsorption data. Results: The results revealed in optimized conditions (pH=5, contact time=15 min, pollutant concentration= 10mg/l and adsorbent dose=0.75 g/l) maximum adsorption capacity and removal efficiency of 2,4-dichlorophenol were 84.74 mg/g and 100%, respectively. Finally, pseudo-first-order, pseudo-second-order kinetic, Langmuir and Freundlich isotherm models and adsorption thermodynamic were studied in optimized conditions.
#Toram online synthesis series
Materials and methods: The adsorption behavior of 2,4-dichlorophenol was studied in a series of batch experiments as a function of pH (3-11), contact time (0-120 min), and pollutant concentration (10-125 mg/L) at three different adsorbent dosages (0.1-1 g/L). Current study batch was done to investigate the adsorption of 2,4 dichlorophenol onto Magnetic Graphene Oxide Particles (MGO NPs). High resistance against degradation, creating odor and taste in water, high toxicity and being carcinogen have made this pollutant a great concern. Background and purpose: 2,4 dichlorophenol is one of the most important components of organochlorine.
0 kommentar(er)
