Epidesmine as a silicon source was used to synthesize NaP zeolite by a hydrothermal method. Parameters such as SiO 2 /Al 2 O 3 and H 2 O/Na 2 O molar ratios, reaction temperatures and reaction times were investigated for regulating the purity of the final product. The samples were characterized by X-ray diffraction, infrared spectroscopy and scanning electron microscope. The experimental results evidenced that a high-quality NaP zeolite was obtained at SiO 2 /Al 2 O 3 and H 2 O/Na 2 O molar ratios of 3.7 and 55, respectively, and at a temperature of 95 • C for 6.5 h of ageing. The BET surface area and total pore volume of the powders were 17.1359 m 2 g −1 and 0.006845 cm 3 g −1 , and the pore size was ∼3.2 μm.

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Stellerite zeolite conversion into zeolite X can be divided into five steps; the mechanism of stellerite zeolite conversion into zeolite X conformed to the liquid phase transformation mechanism.

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A reaction of 800 mesh stellerite and a concentration of 15% hydrochloric acid in a solid to liquid ratio of 1:3 was carried out for 2 h at 80 • C. Most of its impurities were removed. It can be used as precursors for the preparation of high quality zeolite. Zeolite X which is octahedral crystal shape as cube, 96% of the degree of crystallinity has been synthesized hydrothermally from n(SiO 2 /Al 2 O 3) = 3, n(Na 2 O/SiO 2) = 1.14 and n(H 2 O/Na 2 O) = 37 by controlling reaction temperature and time. The synthesis included zeolite X as carriers, chitosan as intermediates, a mass ratio of zeolite X:chitosan:potassium diformate = 3:1:2 in weight for 2 h at 40 • C. X-ray photoelectron spectroscopy analysis showed hydrogen bond formation by the chitosan amino hydrogen, potassium diformate oxygen and zeolite X oxygen or hydrogen bond formation by free hydroxyl group of zeolite X and oxygen of chitosan's CO , indicating effective grafting. Zeolite X sustained-release antibacterial agent was prepared with an inhibition rate of 78.16% by the antibacterial.