1. Reporter ： Weikang Zhang Date ： 2012-12-11 Adsorption removal of phosphate from water by model-La/Al zeolite adsorbents Tianjin University

2. Contents BackgroundCurrent situationExperiment

3. Background Harm

4. CN>0.3 mg/L CP>0.02 mg/L eutrophication

5. Current situation The treatment technologies presently available for phosphorus removal include: a)biological treatment b)chemical precipitation c)ion exchange d)Adsorption Most of these approaches are generally more suitable for the removal of phosphate of higher concentration.

6. Adsorption is recommended as one of the most effective removal processes for the low concentrations of phosphorus. Many types of adsorbents for phosphate removal have been investigated.

7. Adsorbent Natrual materials zeolitepeat Synthetic materials mesoporous silicates aluminum oxides iron oxides

8. Adsorbent Active componentSupport Preparation methodsSource LaAl-PILCLa 2 O 3 /Al 2 O 3 Montmorillonite 100 mesh Solid-liquid mixed Stirred for 5h Standed for 24h Kunming university of science and technology La-VesLa 2 O 3 Vesuvianite Solid-liquid mixed Standed for 40h Calclined at 673K for 3h Yunnan Normal University La-ZeoLa 2 O 3 Natural zeolite Diameter of 90μm Solid-liquid mixed calcined Southeast University

9. Main work Materical characterization Phosphate adsorption experiment Adsorption isotherm Phosphate adsorption kinetics Influence on adsorption of phosphate Stability Regeneration studies

10. Adsorption isotherm and kinetics

11. 1mol/L NH 4 Cl 100ml Natrual zeolite 50g Washing with deionized water 25 ℃ 12h 3.44gLaCl3·7H 2 O 2.61gAl(NO 3 ) 3 ·6H 2 O 20ml deionized water Dry 100 ℃ Calcined 550 ℃ 8h 25 ℃ impregnated24h Dry 80 ℃ Calcined 500 ℃ 2h La/Al-zeo Catalyst Figure 1. Process of impregnation method to prepare La/Al-zeo catalyst Experiment

12. Figure 2.1ppm 100ml, contact time is 12h,0.1g

13. Adsorption kinetics Figure 3. initial concentration is 5ppm, 200ml, 0.2g

14. Adsorption isotherm Figure 4. various initial concentrations 100ml,50mg, contact time is 48h

15. Next work Regeneration studies 10mg/L solution Fresh absorbent 0.8mol/L NaCl PH=10.5 25 ℃ Washing with deionized water 25 ℃ Impregnated 3.5h Dry25 ℃ 500 ℃ Calcined 1h regenerated absorbent