STUDIES ON THE ADSORPTION OF Cr (VI) FROM AQUEOUS SOLUTION BY LOW COST ACTIVATED CARBON

Abstract

The efficiency of activated carbon prepared from Azadirachta indica stem carbon (AZSC) for the adsorption of Cr(VI) from aqueous solution using batch mode experiment has been studied as a function of agitation time, adsorbent dosage, initial dye concentration, temperature and pH of adsorbate solution. The ideal conditions for the adsorption have been shown up and tests were led to discover the Langmuir constants, Freundlich constants, Lagergren, Bhattacharya- Venkobachar and kinetic parameters. The percentage removal of Cr(VI) increases with the increase of the dose of the adsorbent and decreases with the increase of the concentration of adsorbate solutions. Similarly, the minimum time required to achieve maximum adsorption also increases with the increase of the dose of the adsorbent. Studies pertaining to FT-IR, SEM, effect of temperature and desorption studies revealed the existence of physisorption.