Journal of Environmental Health Science & Engineering43ADSORPTION OF CHROMIUM FROM WASTEWATER BY PLATANUS ORIENTALIS LEAVES 191196A. H. MahviR. NabizadehF. GholamiA. Khairi20151209The Cr (VI) adsorption characteristics of platanus orientalis leaves and their ash were examined as a function of contact time, initial pH and metal ion concentration. Batch adsorption experiments were performed. The effects of Ca2+, Mg2+, Na+ and K+ on adsorption were studied. The effect of this adsorbent on COD in wastewater showed that 2g/L of adsorbent caused increase of 110mg/L and 76mg/L COD in deionized water in 120 minutes for platanus orientalis leaves and their ash , respectively. The maximum removal took place in the pH range of 6-7, contact time of 60 minutes and initial concentration of 2mg/L. Studies showed that the Freundlich adsorption model better fitted with the results than Langmuir with R2 > 0.85. The study showed platanus orientalis leaves ash was more favorable than living ones as well as in removing chromium from the aqueous solution.https://ijehse.tums.ac.ir/index.php/jehse/article/view/131https://ijehse.tums.ac.ir/index.php/jehse/article/download/131/130