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 .
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