Showing 2 results for Removal.
M. Farasati, S. Boroomandnasab, J. Abedi Koupai, N. Jafarzadeh, H. Moazed, M. Saiedian,
Volume 16, Issue 61 (10-2012)
Abstract
The effect of sugarcane straw anion exchanger with Micro and Nanostructure scale as the adsorbent for contaminated water treatment was investigated. The effects of operating conditions such as adsorbent loading, initial anion concentration, pH and the presence of competitive ions on the adsorption performances were examined. Equilibrium time and pH and adsorbent dosage were 3h, 6 and 0.5g respectively. The effect of initial concentration on the adsorption of NO3- ions by sugarcane straw anion exchanger was investigated by varying solution concentrations (5-120 mg L-1) using 0.5g adsorbent dose. For micro and nanostructures, adsorption capacity was (0.38-6.94 mg g-1) and (0.44-7.51 mg g-1) respectively. In the column experiment, for micro and nanostructures with (15, 50 and 120 mg L-1) and 0.98 L hr-1 flow rate, adsorption capacity was (8.73, 25.71and 36.25 mg g-1) and (12, 27 and 48.15 mg g-1) respectively. The result of this study indicated that sugarcane straw anion exchanger with micro and nanostructure scale could be used for the removal of nitrate ions in the contaminated water treatment. sugarcane straw anion exchanger -nanostructure adsorbent had higher adsorption than micro adsorbent for nitrate removal.
F Pooladi, M Hamidrpour,
Volume 18, Issue 70 (3-2015)
Abstract
Removal of boron from aqueous environments (soil and water) is difficult, because it is present as B(OH)3 and B(OH)4- species. This research was done to study the sorption of boron by HDTMA-modified zeolite. The sorption of B on modified zeolite was studied as a function of pH (B concentration: 1 and 10 mg L-1) in the range of 6-9.5, and as a function of ionic strength (0.03 and 0.06 M Ca(NO3)2 or Mg(NO3)2) at a constant B concentration of 5 mg L-1. Sorption isotherm was performed for the solutions containing initial B concentration in the range of 1-15 mg L-1 using a 24h batch equilibration experiment. The results revealed that surfactant-modified zeolite exhibited the best performance at pH 9.5, and sorption of B increased with the increase of suspension pH. Greater B adsorption in the Ca system over the Mg system was clearly observed for the modified zeolite. Sorption isotherm of B were well described by the Freundlich and Langmuir models but the Freundlich sorption model described the interaction between B and the mineral material better than the Langmuir model. Maximum sorption capacity (qmax) of the sorbent was 120 mmol kg-1. The experimental data showed that HDTMA-modified zeolite used in this study had a reasonable sorption capacity for B.
