In this experimental research the adsorption of the isotherm of tramadolas, a kind of narcotic drugs is studied on the multi-wall carbon nanotube with the spectrophotometer. The amount of adsorption in various concentrations was calculated and its related diagram was drawn. The result, which was obtained by Langmuir, Freundlich and Temkin in 296 ± 2 K, compared coefficient parameters show that the Temkin has the most accordance.

Nowadays, it is admitted to using of suitable carrier results in improving drug delivery such as nanotubes. So, multi-walled carbon nanotube (MWCNTs) has been proposed as a carrier (adsorbent) to improve the neurological Oxazepam (OZ) drug delivery. Freundlich, Temkin, and Langmuir isotherm models have been used in order to do assay adsorption of the OZ on the MWCNT. The maximum value of the isotherm constant (b = 0.14 L/mg) at 303 K temperature indicates stronger (better) adsorption of the OZ on the MWCNT surface in low concentrations (20 mg/L) and acidic pH; in fact, increasing of pH led to decreasing adsorption (60 ! 35.91 mg/g) and dehydrogenation of the OZ drug. Reaching to the equilibrium state after 90 min and negative value of the ΔH (−41.57 kJ/mol) shows that the OZ adsorption has fast kinetic and exothermic processes. These issues imply depending of the OZ adsorption on the OZ concentration and the weight of adsorbent in the adsorption process.

The objective of this work was to study the adsorption behaviour of non-steroidal antiinflammatory drugs (NSAIDs) e.g., aspirin, diclofenac and naproxen by single walled carbon nanotube as the function of initial concentration of adsorbate through adsorption isotherms. The amount of NSAIDs adsorbed from aqueous solution increases with the increase of the initial NSAIDs concentration. The adsorbent capacity was determined using the parameters of Langmuir, Freundlich and Temkin adsorption isotherm models that the NSAIDs adsorption isotherm data fit best to the Freundlich isotherm model. The results showed that aspirin has maximum adsorption rate of single wall carbon nanotube.

No abstract

No abstract

No abstract

Carbon nanotubes(CNT) are different form of carbon with a cylindrical nano-structure . Nanotube with the length-to-diameter ratio to 132,000,000:1 is made very larger than any other ORIENTAL JOURNAL OF CHEMISTRY ABSTRACTAdsorption of methyl orange and phenolphthalein by multi-wall Carbon Nanotube and activated carbon is very important, because methyl orange is used widely in acid-basic indicators and phenolphthalein as an indicator sodium or potassium alkoxide or titration of carboxylic acids hydroxide. Adsorbed compounds depend on sample concentration. Isotherms adsorption methyl orange and phenolphthalein with very models are studied. The purpose of this study was to investigate adsorption isotherms of methyl orange and phenolphthalein by multi-wall Carbon Nanotube (MWCNT s ) and activated carbon (AC) with models Freundlich ,Temkin , Langmuir . By maximum wavelength is obtained by spectrophotometer (uv / vis) model (JENWEY) and different concentrations are obtained from made solution and their adsorptions, and relative diagram was drawn. Study of experiments result was matched with these three models and different parameters of these models were obtained. Obtained results show the effect of concentration on covering the surface by model Langmuir for active carbon by methyl orange with 95.3% and model Freundlich for active carbon by phenolphthalein with 98.7% and model Freundlich for Carbon Nanotube by methyl orange with 96.3% and model Langmuir for Carbon Nanotube by phenolphthalein with 95.5% . Results of this study show that Priority of model of models for adsorption of methyl orange by Carbon Nanotube is : 1) Freundlich , 2) Temkin , 3) Langmuir and for adsorption phenolphthalein by Carbon Nanotube is : 1) Langmuir , 2) Freundlich , 3) Temkin and for adsorption of methyl orange by active carbon : 1) Langmuir , 2) Temkin , 3) Freundlich and for adsorption of phenolphthalein by active carbon : 1) Freundlich , 2) Temkin , 3) Langmuir .

In this work, carbon nanotubes (MWCNTs) were utilized as efficient adsorbents for pantoprazole (PP) removal. We used MWCNTs that were synthesized using the chemical vapor deposition process. The physical characteristics of MWCNTs were described by Brunauer-Emmett-Teller (BET) contact area, surface functional group analysis by the point of zero charge (pHPZC), Fourier transform infrared (FTIR) analysis, Scanning electron microscope (SEM), X-ray diffraction (XRD), and Transmission electron microscopy (TEM). The single-point BET surface area of the MWCNTs was found to be 98.7 m 2 g -1 , with the median pores' diameter of 30.9 nm and an average pore(s) volume of 0.764 cm 3 g -1 . Effective parameters on the PP removal including, pH, contact time and initial amount of adsorbents were optimized, revealing maximum PP removal at pH=6.0 after 25.0 min when 0.026 g MWCNTs. The pseudo second-order kinetic model for adsorption of PP on the surface of both adsorbents revealed the high value of correlation coefficient, indicating the high ability of the pseudo second-order model for representation of experimental results. Adsorption equilibrium studies indicated that the Freundlich isotherm efficiently represented MWCNTs adsorption data. The thermodynamic parameters (Gebbs free energy, enthalpy, and entropy) of adsorption process were calculated. Results had shown that adsorption of PP on the MWCNTs is feasible, spontaneous, and exothermic process in the temperature range of 25-76 °C.