TITLE:
Mutual Adsorption of Lead and Phosphorus onto Selected Soil Clay Minerals
AUTHORS:
Mohammed Abdalla Elsheikh, Pardon Muchaonyerwa, Erni Johan, Naoto Matsue, Teruo Henmi
KEYWORDS:
Allophane, Kaolinite, Montmorillonite, Mutual Adsorption, Lead and Phosphorus
JOURNAL NAME:
Advances in Chemical Engineering and Science,
Vol.8 No.2,
April
9,
2018
ABSTRACT: Mutual adsorption of lead (Pb) and phosphorus (P) at pH 5 onto three soil
clays materials (kaolinite, montmorillonite, and allophane) was studied to
know interaction of the anion and the cation at surface of the clays. Adsorption
of Pb was determined on montmorillonite, kaolinite and allophane with
the following pretreatments; 1) untreated clay (control), 2) phosphate treated
clay (P-clay) and 3) clay pre-treated with both P and Pb (P-Pb-clay). Adsorption
of P was determined on montmorillonite, kaolinite and allophane with
the following pretreatments; 1) control 2) Pb treated clay (Pb-clay) and 3)
P-Pb-clay. The adsorption of Pb on the untreated clays was in the order:
montmorillonite > allophane > kaolinite. On allophane and kaolinite Pb adsorption
was in the order P-clay > P-Pb-clay > control. For montmorillonite,
the trend was: P-Pb-clay = control > P-clay. Phosphorus adsorption was in the
order Pb-clay = P-Pb-clay > control for montmorillonite and kaolinite,
Pb-clay > control > P-Pb-clay for allophane. The findings suggested that
pre-treatment with phosphate increases Pb adsorption on kaolinite and allophane,
and decrease on montmorillonite, while pretreatment with Pb increases
phosphate sorption on all clays, and both Pb and P increased adsorption
on montmorillonite and kaolinite and decrease on allophane.