a green, efficient and selective approach for the oxidation of sulfides to sulfoxides and sulfones with uhp at room temperature is reported. the reaction is performed in the presence of vanadia catalyst supported on mesocellular silica foam (mcf) with a v content ranging from 2% to 10% as heterogeneous and reusable catalyst. the structural and textural characterization of this catalyst were don...

Bisphenol-A (BPA), 17?-ethinylestradiol (EE2), and 4-nonylphenol (4NP) are endocrine-disrupting chemicals (EDCs) that useful models for studying the potential fate transport of EDCs in soil water environments. Two alluvial soils with contrasting physicochemical properties were used as adsorbents this study. The Zook material had more organic matter clay than sandy loam Hanlon material. Batch eq...

Adsorption of gases in porous adsorbents such as coal and shale generally exhibits the phenomenon hysteresis. Most previous studies on desorption hysteresis were conducted via experimental tests. However, few theoretical models that represent adsorption–desorption sorbents are available. To address this issue, work develops a new model for describing adsorption isotherms with Particularly, ener...

The current study both synthesizes and uses four compounds of graphene oxide (GO), nitrogen doped graphene oxide (ND-GO), high nitrogen doped graphene oxide (HND-GO), and three dimensional high nitrogen doped graphene oxide (3D-HND-GO) in order to remove a model anionic dye, Congo red (CR) from wastewaters. It also compares their carbon nano-structure, with regard to removal efficiency and find...

Various nanocomposite materials play a number of important roles in modern science and technology including pharmaceutical science. Among these materials, mesoporous materials cover a large number of applications in drug delivery system. The quantitative incorporation and high dispersion of selenium nanoparticles into MCM-41 have been made possible by the coordination between Se(IV) ion and ami...

The chemist is aware of the synergetic effects arising from a simultaneous application of thermodynamic and kinetic concepts. To give a few examples, the (thermodynamical) Langmuir adsorption isotherm has a simple kinetic derivation, basing on the assumption of a dynamical equilibrium [La18]. We evaluate adsorbate binding energies from the temperature-dependence of desorption rates [Re62], wher...

Analytical isotherm equations such as Langmuir and Freundlich isotherms are widely used for modeling adsorption data. However, these isotherms are primarily useful for simulating data collected at a fixed pH value and cannot be easily adapted to simulate pH-dependent adsorption effects. Therefore, most adsorption studies currently use numerical surface-complexation models (SCMs), which are more...

The current study both synthesizes and uses four compounds of graphene oxide (GO), nitrogen doped graphene oxide (ND-GO), high nitrogen doped graphene oxide (HND-GO), and three dimensional high nitrogen doped graphene oxide (3D-HND-GO) in order to remove a model anionic dye, Congo red (CR) from wastewaters. It also compares their carbon nano-structure, with regard to removal efficiency and find...

The halloysite has been subjected to modification through ultrasound (HU), sulfuric acid (HU-SA), and oligocyclopentadiene resin (HU-OCPD). modified materials were characterized by scanning electron microscopy energy-dispersive X-ray spectroscopy (SEM-EDS), Fourier-transform infrared (FTIR), thermogravimetry (TG), N2 adsorption-desorption isotherms, tested as low-cost adsorbents for removal of ...

This study proposed an oil palm by-product as a low-cost adsorbent for the removal of hexavalent chromium [Cr (VI)] from aqueous solution. Adsorption of Cr (VI) by sulphuric acid and heat-treated oil palm fibre was conducted using batch tests. The influence of pH, contact time, initial chromium concentration and adsorbent dosage on the removal of Cr (VI) from the solutions was investigated. The...