HYDROTHERMAL METHOD FOR SYNTHESISING A COMPOSITE ZEOLITE MATERIAL OF CLINOPTILOLITE AND PHILLIPSITE, USEFUL FOR REMOVING ARSENIC FROM DRINKING WATER

摘要

The invention relates to a hydrothermal method for synthesising a composite zeolite material of clinoptilolite and phillipsite, useful for removing arsenic from drinking water, which comprises: (a) mixing the raw material: a reaction gel formed by a mixture of diatomite, potassium hydroxide and water is added to a stirred reactor provided with a heating jacket, in a molar ratio of: SiO₂/Al₂O₃=11.5; K₂O/SiO₂=0.8 and H₂O/K₂O=191, the mixture being stirred at 120-140 rpm for at least 10 minutes and maintained at 130-170°C for at least 5.5 days at autogenous pressure in a static system; (b) cooling: the composite material of clinoptilolite and phillipsite is left to cool for 6-10 hours; and (c) filtering, washing and drying: the material is filtered and washed with plenty of double-distilled water and is finally dried at 120°C for at least 15 hours. The invention also relates to the zeolite material and its use.