Produção Nacional
Revisado por pares
PHOSPHATE ADSORPTION ON CHITOSAN-Fe III -CROSSLINKING: BATCH AND COLUMN STUDIES
2001; Taylor & Francis; Volume: 24; Issue: 8 Linguagem: Inglês
10.1081/jlc-100103441
ISSN1520-572X
AutoresTathyane Fagundes, Estefânia Luiza Bernardi, Clóvis Antônio Rodrigues,
Tópico(s)Iron oxide chemistry and applications
ResumoEutrophication is the over fertilization of a body of the water by nutrients resulting in enhanced algae growth, and phosphate is usually identified as the cause. In this work, the adsorption of phosphate on chitosan-iron(III)-crosslinked (CH-FeIII-CL) was investigated in an experiment of solid-phase extraction. The isotherm adsorption, kinetic adsorption, and pH study were carried out in thermostatically-controlled batches. The dynamic studies were drivers in glass columns. Batch study shows that phosphate adsorption becomes constant after 60 min, 7.0 is optimal pH for phosphate adsorption. Affinity constant and maximum adsorption capacity determined by Langmuir equation were 44.4 L min−1 and 131 mg g−1. As expected, an increase in the flow-rate reduced the breakthrough volume (180 and 230 mL), exhaustion volume (380 and 420 mL), breakthrough sorption capacity (18 and 23 mg g−1), and exhaustion sorption capacity (32.4 and 61.4 mg g−1) for 2.5 mL min−1and 1.0 mL min−1. Such a decrease can be ascribed to a lower residence time.
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