Nano-leucite for slow release nitrogen fertilizer and green environment

A method for preparing a nanoparticle potassium aluminum silicate and occluding its inner structure with calcium ammonium nitrate to provide a sustained release fertilizer, such method comprising:

• a. making a solution consisting of 0.7 to 0.8% sodium dodecyl sulfate, 16.67% of potassium hydroxide and 0.7 to 0.8% aluminum chloride and thoroughly mixing the contents for 10-15 minutes;
• b. adding a sufficient quantity of silica in the solution in step a such that the final concentration of silica is 7 to 8%;
• c. stirring the mixture in step b for another 20-30 minutes;
• d. autoclaving the mixture in step c at 180 C for four hours;
• e. cooling the autoclaved material in step d and filtering through filter;
• f. washing the filtrate in step e with methanol until pH of the solution becomes neutral;
• g. washing the filtrate from step f with distilled water three times;
• h. calcining the product from step g at 550 C for three hours;
• i. combining one part of the product from step h with 4 parts of ground calcium ammonium nitrate in an alumina crucible;
• j. heating the crucible to 160 to 180 C for four hours;
• k. cooling down the crucible and transferring the material in crucible to a centrifuge;
• l. washing the material with water in the centrifuge operating between 10,000 to 15,000 rpm for 1 minute and repeating the process five times;
• and
• m. air-drying the sample.