Surface tensions of dilute solutions of cyclohexane, hexane, heptane, and nonane in benzyl alcohol were measured
at various temperatures. Surface mole fractions were obtained from an extended Langmuir model. The results
show that all of alkanes are surface active in benzyl alcohol and that their surface mole fractions are higher than
their bulk mole fractions. The lyophobicity of solutes decreases with increasing temperature.
This work investigated the adsorption ability of unmodified and carbon-modified TiO 2 nanoparticles for the removal of methyl orange (MO) from aqueous solution. Carbon-TiO 2 was obtained by carbonization of ethanol vapors at three different temperatures (200, 300, and 400˚C), and their adsorption was compared with unmodified TiO 2 nanoparticles. The Freundlich adsorption model was found to fit for TiO 2 and C-TiO 2-200, while carbon modification of TiO 2 at a high temperature fitted the Langmuir-Freundlich model (C-TiO 2-300 and C-TiO 2-400). Generally, the carbonization of C-TiO 2 increased the adsorption capacity of TiO 2 nanoparticles, however the BET surface of modified and pristine TiO 2 was almost the same. The zeta potential of modified TiO 2 is higher than unmodified TiO 2 , which leads to efficient adsorption of MO onto modified TiO 2 .
In the present study, adsorption of Bismarck Brown (BB) dye onto iron oxide nanospheres (IONs) and modified IONs by HCl from aqueous solution was investigated. The IONs was synthesized by solvothermal method and then modified by HCl. The high magnetic properties of both adsorbents lead to facial separation from aqueous solution by an external magnet. The results show that the modification of adsorbent cause higher adsorption capacity for removal of BB from aqueous solution. The prepared adsorbents were characterized by SEM, XRD, FTIR, and ATR-IR techniques. The adsorption kinetic and equilibrium data were fitted with different models. The results show that the equilibrium and kinetic data were best fitted with Langmuir-Freundlich isotherm and fractal-like pseudo-second-order kinetic model, respectively. The effects of pH and temperature have also been investigated.
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