Adsorption capacity and removal efficiency of heavy metal ions by Moso and Ma bamboo activated carbons
Journal
Chemical Engineering Research & Design
Journal Volume
90
Journal Issue
9
Pages
1397-1406
Date Issued
2012
Author(s)
Abstract
In order to understand the adsorption capacity and removal efficiency of heavy metal ions by Moso and Ma bamboo activated carbons, the carbon yield, specific surface area, micropore area, zeta potential, and the effects of pH value, soaking time and dosage of bamboo activated carbon were investigated in this study. In comparison with once-activated bamboo carbons, lower carbon yields, larger specific surface area and micropore volume were found for the twice-activated bamboo carbons. The optimum pH values for adsorption capacity and removal efficiency of heavy metal ions were 5.81-7.86 and 7.10-9.82 by Moso and Ma bamboo activated carbons, respectively. The optimum soaking time was 2-4h for Pb 2+, 4-8h for Cu 2+ and Cd 2+, and 4h for Cr 3+ by Moso bamboo activated carbons, and 1h for the tested heavy metal ions by Ma bamboo activated carbons. The adsorption capacity and removal efficiency of heavy metal ions of the various bamboo activated carbons decreased in the order: twice-activated Ma bamboo carbons>once-activated Ma bamboo carbons>twice-activated Moso bamboo carbons>once-activated Moso bamboo carbons. The Ma bamboo activated carbons had a lower zeta potential and effectively attracted positively charged metal ions. The removal efficiency of heavy metal ions by the various bamboo activated carbons decreased in the order: Pb 2+>Cu 2+>Cr 3+>Cd 2+. © 2011 The Institution of Chemical Engineers.
SDGs
Type
journal article