ADSORPTION OF As(III) FROM AQUEOUS SOLUTION BYKOH-MODIFIED TEA RESIDUE

Abstract

    The KOH-modified tearesidue (KTR) was used as a adsorbent to remove efficiently As(III) from aqueous solution.Scanning electron microscopy (SEM) imagesof KTR reveal a highly porous surface structure of the adsopbent.The adsorption properties forCr(VI) ofKTR were investigatedby batch method. The influence of pH (1-9), contact time (60-300 min), and the amount of adsorbent (0.1-0.5g) on As(III)removal efficiency by the KRT were also determined. The results show that the time to reach adsorption equilibrium, the optimal pH value, and mass of adsopbentare210 min, 2.0, and0.1g, respectively. The maximum monolayer adsorption capacity of KTR is 6.489mg/g. KTRacts as a promising adsorbent for the removal of heavy metal ions from aqueous solution.

Keywords: Adsorption; tea wasteresidue;Langmuirisotherm;heavy metals; ankali treatedtearesidue