Phosphate adsorption on chitosan-Fe-III-crosslinking: Batch and column studies

Eutrophication is the over fertilization of a body of the water by nutrient s resulting in enhanced algae growth, and phosphate is usually identified a s the cause. In this work, the adsorption of phosphate on chitosan-iron(III )-crosslinked (CH-Fe-III-CL) was investigated in an experiment of solid-pha se extraction. The isotherm adsorption, kinetic adsorption, and pH study we re 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 eq uation were 44.4 L min(-1) and 131 mg g(-1). As expected, an increase in th e flowrate reduced the breakthrough volume (180 and 230 mL), exhaustion vol ume (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(-1 ) and 1.0 mL min(-1). Such a decrease can be ascribed to a lower residence time.