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H. Pahlavanzadeh,R. Katal,H. Mohammadi 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.3
The aim of this research work is to investigate sorption characteristic of polypyrrole coated on the sawdust (PPy/SD) for the removal of NO3from aqueous solutions and wastewater. The sorption of NO3 is carried out by batch method. The optimum conditions of sorption were found to be: a sorbent dose of 0.6 g in 100 ml of NO3solution, contact time of 20 min and pH = 5. In optimum condition, removal efficiency was 84.2% for the NO3. Three equations, i.e. Morris–Weber, Lagergren and pseudo second order have been tested to track the kinetics of removal process. The Langmuir, Freundlich and D–R are subjected to sorption data to estimate sorption capacity. It can be concluded that PPy/SD has potential to remove NO3ions from aqueous solutions at different concentrations. Also the effect of temperature on the process was investigated. It was found that the temperature has positive effect on the process and the negative DG values indicated thermodynamically feasible and spontaneous nature of the sorption. The positive value of DS reveals the increased randomness at the solid–solution interface during the fixation of the ion on the surface of the sorbent.
L. Omidvar Langroudi,H. Pahlavanzadeh,S.M. Mousavi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
In the present study the performance of an air dehumidifier using lithium bromide (LiBr) as a desiccant was investigated. Response surface methodology (RSM) was used to assess individual and interactive effects of the six main factors (velocity, temperature and humidity of air, flow rate, temperature and concentration of desiccant) on dehumidification mass rate. A reduced quadratic statistical model was derived to predict dehumidification mass rate. The maximum dehumidification mass rate was obtained 0.154 g/s under the optimal conditions of an air velocity of 4.1 m/s, desiccant flow rate of 0.035 kg/s, air humidity ratio of 0.0185 kg/kg, desiccant concentration of 0.48 kg/kg, air temperature of 29.5 ℃, and desiccant temperature of 21.8 ℃. The effectiveness number of transfer unit (NTU) model was employed to describe the coupled heat and mass transfer. The results of the model and the experimental data show good agreement. Dimensionless mass and heat transfer coefficients correlations are proposed; the average absolute differences between the predicted values and the experimental findings for Sh and Nu numbers were calculated as 2.14% and 5.27%, with the discrepancies mainly within ±9% and ±13%, respectively.