STUDY ON ADSORPTION OF Cr(VI) IN WATER USING COFFEE GROUNDS MATERIAL

Abstract

This study aimed to remove Cr(VI) from water using coffee grounds material
as an adsorbent. The adsorption of Cr(VI) in water using coffee grounds material
was investigated by batch adsorption experiments at room temperature.The
study was conducted at pH = 1 - 10, reaction time 30 - 300 minutes. Initial
concentration of Cr (VI) 5; 10; 15; 20; 25; 30; 35mg/l. The results show that: (1) In
the environment assuming, the optimal removal of Cr (VI) at reaction time of 90
minutes, pH = 1, material weight is 1g/100ml, the maximum concentration of Cr
(VI) is < 20mg/L. The maximum monolayer adsorption capacity of coffee
grounds calculated from Langmuir isotherms was found to be 20.40mg/g; (2)
Research results treating Cr (VI) in wastewater of Bowang Co., Ltd. in Diem Thuy
industrial zone, Phu Binh district, Thai Nguyen province, adsorption efficiency is
99.5%. Therefore, coffee grounds acts as a promising adsorbent for the removal
of heavy metals ion from wastewater.