• YINCHANG PEI

      Articles written in Bulletin of Materials Science

    • Zeolite X with potassium diformate as a sustained-release antibacterial agent

      YUE HU XIAOWEI GUO YINCHANG PEI XIULI WANG QINGLIN XIE NANCHUN CHEN

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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$^{\circ}$C. Most of its impurities were removed. It can be used as precursors for the preparationof high quality zeolite. Zeolite X which is octahedral crystal shape as cube, 96% of the degree of crystallinity has been synthesized hydrothermally from $n({\rm SiO}_2/{\rm Al}_2{\rm O}_3) = 3$, $n({\rm Na}_2{\rm O}/{\rm SiO}_2) = 1.14$ and $n({\rm H}_2{\rm O}/{\rm Na}_2{\rm O}) = 37$ 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$^{\circ}$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 C–O, indicating effective grafting. Zeolite Xsustained-release antibacterial agent was prepared with an inhibition rate of 78.16% by the antibacterial.

    • Synthesis of a high-quality NaP zeolite from epidesmine by a hydrothermal method

      XIANGJIAN MENG XIAOWEI GUO YIJIAN ZHONG YINCHANG PEI NANCHUN CHEN QINGLIN XIE

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      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 electronmicroscope. 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$^{\circ}$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 $\sim$3.2 $\mu$m.

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