Multivariate optimization approach applied to natural polymers from L. and Lam as coagulating/flocculating agents.

In this study, a multivariate experimental design was applied to optimize the operational conditions (seed mass, salt concentration, and pH) to employ L. (carob) and Lam (moringa) as coagulating/flocculating agents for water treatment. Currently, the coagulation stage in water treatment uses aluminium compounds, due to the characteristic reaction to natural alkalinity in raw water, and for its low market value.

Kinetics and thermodynamics studies of silver ions adsorption onto coconut shell activated carbon.

The presence of silver in the natural water environment has been of great concern because of its toxicity, especially when it is in the free ion form (Ag(+)). This paper aims to study the adsorption kinetics of silver ions from an aqueous solution onto coconut shell activated carbon using batch methods. Batch kinetic data were fitted to the first-order model and the pseudo-second-order model, and this last equation fits correctly the experimental data.