The competitive effects of soluble material leached from the adsorbents that also bind metal ions were studied.
Column adsorption studies showed that metal ions adsorbed by coffee grounds could be quantitatively leached in dilute acid solution without any loss of subsequent adsorption properties, thus promoting efficient re-use of the column for many adsorption cycles.
The acid base chemistry of both tea leaves and coffee grounds, and the soluble materials leached from the fresh tea and coffee, were studied using potentiometric titration.
However, some preliminary work was also conducted using spent tea leaves.
Further investigation for availability and resupply kinetic assessment before and after remediation was done using the DGT technique and DIFS model. However, mixed surfactants can be suggested as effective adsorbents for heavy metal removal than single surfactants on account of better percentage removal at relatively low CMC and post-treatment sludge production.
Delonix regia could be used to remove these target metals from organic matter rich agricultural soil while the biochar with higher removal efficiency in most soil samples is better suitable for acidic and poor organic matter soils.
An interaction time of 30 minutes was sufficient to achieve maximum uptake. The adsorbent was also found to be largely unaffected by biological degradation.
The Kd, labile pool size is increasing with aging time. The adsorption of heavy metals by waste tea and coffee residues Thesis, Doctor of Philosophy.
Batch adsorption experiments were carried out using the adsorbent prepared from the pods and leaves of Delonix regia in order to determine the suitable operating parameters for the adsorption of the target heavy metals from synthetic metal solutions.
This work has demonstrated that D.