Novel biosorbent 'maize bran' has been successfully utilized for the removal of Cr(VI) from aqueous solution. The effect of different parameters such as contact time, sorbate concentration, pH of the medium and temperature were investigated and maximum uptake of Cr(VI) was 312.52 (mgg(-1)) at pH 2.0, initial Cr(VI) concentration of 200mgL(-1) and temperature of 40 degrees C. Effect of pH showed...

Plastic debris litters marine and terrestrial habitats worldwide. It is ingested by numerous species of animals, causing deleterious physical effects. High concentrations of hydrophobic organic contaminants have also been measured on plastic debris collected from the environment, but the fate of these contaminants is poorly understood. Here, we examine the uptake and subsequent release of phena...

Motivated by the puzzle of sorption hysteresis in Portland cement concrete or cement paste, we develop in Part II of this study a general theory of vapor sorption and desorption from nanoporous solids, which attributes hysteresis to hindered molecular condensation with attractive lateral interactions. The classical mean-field theory of van der Waals is applied to predict the dependence of hyste...

Batch sorption experiments were performed for the removal of chromium(III) ions from aqueous solutions using Romanian Sphagnum moss peat (untreated and treated with NaCl solution) as sorbent. In order to establish the best conditions for the sorption of chromium(III), the influence of initial pH, contact time, peat dose and metal ion concentration was investigated. The Freundlich, Langmuir and ...

• Biochar and digestate were tested as novel sorbents for biopurification systems. • Digestate and biochar mixture enhanced the sorption coefficient by a factor of N50. • Boscalid and pyrimethanil exhibited N25 fold higher Kd/Koc values than bentazone. • Desorption was hysteretic (H ≥ 0.001) for biochar and digestate based soil

Sorption of vapors by glassy polymers is known to have properties that are different from those typical for sorption rubbery or liquids. Despite an importance many practical applications, this difference still not fully understood. We developed a thermodynamic theory description penetrant activity in the state. The presented approach considers glass transition terms second order phase and utili...

A new, twofold interpenetrated metal-organic framework (MOF) material has been synthesized that demonstrates dramatic steps in the adsorption and hysteresis in the desorption of CO(2). Measurement of the structure by powder X-ray diffraction (PXRD) and pair distribution function (PDF) analysis indicates that structural changes upon CO(2) sorption most likely involve the interpenetrated framewor...

The nonlinear inverse problem of determining the hydrogen permeability parameters of stratified materials is considered. The model includes diffusion, invertible capture and sorption/desorption processes on surface, which leads to dynamical boundary conditions. For the concentration impulses method, the equation of stationary oscillations of concentration is obtained. Parametric identification ...

Understanding P sorption from animal manures is essential to formulate best management practices with regard to land application of manure from the standpoint of crop production and environmental quality. Little research has focused on the construction of P sorption isotherms where the P source is manure. The objectives of this study were to: (i) develop a procedure to characterize how inorgani...

Sorption of oxyanions by soils and mineral surfaces is interest due to their role as nutrients or pollutants. Volcanic are variable charge soils, rich in active forms aluminum iron, capable sorbing anions. desorption vanadate, arsenate, chromate two African andosols was studied laboratory experiments. isotherms were determined equilibrating at 293 K soil samples with oxyanion solutions concentr...