1 research outputs found
Intercalation of Gastropod Shell Derived Calcium Oxide in Clay and Application in Phosphate Removal from Aqua Medium
The phosphate sorption potential of the layered framework
of naturally
occurring clay, which acts as a host in the sorption process, was
boosted via intercalation of CaO derived from a Gastropod shell (GS).
GS was used as precursor for the synthesis of the CaO in the perspective
of waste recycling and cost minimization in environmental remediation.
The phosphate sorption potential, PZC, and the surface area of raw
clay sample were substantially enhanced by the intercalation process.
The value of the Langmuir monolayer sorption capacity (<i>q</i><sub>m</sub> mg/g) increased from 49.02 to 71.43, PZC values increased
from 4.70 to 7.20, and the surface area (m<sup>2</sup>/g) value increased
from 23 to 103 after the intercalation process. The modification caused
no change in the clay surficial microstructure but increased the lattice
spacing of the clay framework. Increase in phosphate solution pH triggered
monotonical reduction in the magnitude of phosphate sorbed while increase
in phosphate solution ionic strength and concentration of anionic
interferences caused an increase in the amount of phosphate sorbed
per gram of sorbent. Phosphate sorption caused no change in the surficial
microstructure of either sorbents but the crystallinity of the sorbent
was considerably impacted, especially in the raw sampl