Sun coral powder as adsorbent: Evaluation of phosphorus removal in synthetic and real wastewater
2016
Vianna, Marco Tadeu Gomes | Marques, M. (Marcia) | Bertolino, Luiz Carlos
Two exotic species introduced during the 90s known as sun coral currently spread along 2000km of the Brazilian coast pose a severe threat to the marine biodiversity. Since they have exoskeletons with high concentration of calcium carbonate, the present investigation focused on the removal of phosphorus from wastewater, using exoskeleton’s powder in three forms: raw (RSC); physically modified (SCA) and chemically modified (SCC). A Central Composite Design with Response Surface Methodology was applied to the assays along to studies of kinetics, thermodynamics and equilibrium and sorbent’s characterisation by FTIR, XRD and SEM-EDX techniques. The maximum P removal capacities of RSC, SCA and SCC were 6826, 7062 and 9597mgPkg⁻¹, respectively. In all cases, the adsorption followed the Langmuir’s pseudo-second-order kinetic model being the process thermodynamically appropriate. The sun coral-based adsorbent is an attractive option for wastewater treatment and may contribute to the control of the sun coral population.
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