ADSORPTION STUDIES AND THE REMOVAL OF DISSOLVED METALS USING PYROLUSITE AS ADSORBENT

Authors
AJMAL M RAO RAK SIDDIQUI BA
Citation
M. Ajmal et al., ADSORPTION STUDIES AND THE REMOVAL OF DISSOLVED METALS USING PYROLUSITE AS ADSORBENT, Environmental monitoring and assessment, 38(1), 1995, pp. 25-35
Citations number
25
Categorie Soggetti
Environmental Sciences
Journal title
Environmental monitoring and assessment → ACNP
ISSN journal
01676369
Volume
38
Issue
1
Year of publication
1995
Pages
25 - 35
Database
ISI
SICI code
0167-6369(1995)38:1<25:ASATRO>2.0.ZU;2-L
Abstract
The adsorption of metals from aqueous solutions of Pb2+, Zn2+ and Mg2 on naturally occurring pyrolusite have been studied. The chemical sta bility of the pyrolusite has been determined in NaOH, H2SO4, HNO3, HCl , NaCl and NK4Cl solutions of various concentrations. Adsorption of th e metal ions followed the order Pb2+ > Zn2+ > Cd2+. The maximum adsorp tion of Pb2+ (100%) occurred at pH 7. the relation between the amount of Pb2+ adsorbed per unit weight of pyrolusite and the concentration o f Pb2+ at equilibrium follows the Freundlich adsorption isotherm. The efficiency of pyrolusite has been demonstrated by removing lead from s ynthetic waste water. 100% and 96% removal of lead have been achieved from synthetic waste water containing 5 mg 1(-1) and 120 mg 1(-1) of P b2+ respectively at pH 7. The results of these studies suggest that py rolusite might provide an economical method for the removal of lead fr om industrial waste water.