The adsorption of xylenol orange, remazole turquoise blue and procion red by neem (Azadirachta indica) husk carbon activated with ZnCl2, H3PO4 and KOH was examined at different concentrations and at the optimized particle size, shaking time and adsorbent dosage. The adsorption obeyed both Langmuir and Freundlich isotherms but fit Langmuir isotherm than Freundlich isotherm. Adsorption studies were carried out using carbonized neem carbon, activated neem carbon and commercial adsorbent from coconut shell on xylenol orange, remazole turquoise blue and procion red. The study shows a high adsorption for remazol turquoise blue.
