Equ ilibrium biosorptio n isother m for neutral red o n persimm on leaf

Dyes are widely used in industries such as textile, rubber, plastic, cosmetic etc. [۱]. Dyes released by awide variety of sources, and have adverse effects on living organisms [۲]. Different method have been applied for purification purposes including mechanical, physical, chemical and biological [۳]. Adsorption process is one of the effective methods for removal dyes from wastewater. Since one of the best and cheapest adsorbents is tree leaves, we used an inexpensive adsorbent such as persimmon leaf. The goal of present work was to test the ability of persimmon leaf for biosorption of neutral red from aqueous solutions. Adsorption equilibrium data were correlated with the Langmuir and Freundlich isotherms.Materials and Methods: Neutral red were purchased from Merck. The concentration of neutral red solution was ۲۰ till ۴۵ mg/۱. The concentration of colouring matter in each sample was determined by calibration plots drawn by recording the absorbance of dye at different concentrations. All measurements were made at āmax(۴۹۰ nm) on a JENWAY UV-Vis spectrophotometer(model ۶۵۰۵). Persimmon leaf as adsorbent produced from local trees. Persimmon leaves were washed with double distilled water and dried, then grind to get powder.

کلیدواژه ها:

Biosorption ، Neutr al red ، Persimmon leaf ، Langmuir isotherm