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Fabrication of SiO2@silicalite-1 and its use as a catalyst support

机译：SiO 2 @ silicalite-1的制备及其作为催化剂载体的应用

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SiO2@silicalite-1, using silica sol (pH = 9.47, SiO2 ≈ 30 wt%) as the silica source, was directly synthesized in a eutectic mixture where silicalite-1 grains were formed in the three-dimensional net structure of silica gel, grown in situ by transforming amorphous SiO2 into an MFI-type structure and coated with amorphous SiO2. The alkalinity, template agent, and crystallization time strongly affect the physicochemical properties of SiO2@silicalite-1. The physicochemical properties of these samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectra and nitrogen adsorption. The results show that the SiO2@silicalite-1 is synthesized in a eutectic mixture and its physicochemical properties can be tuned by controlling the content of sodium hydroxide and tetrapropyl ammonium bromide (TPABr). A time-dependent study reveals that the formation process obeys an in situ epitaxial growth and phase transformation mechanism. Finally, SiO2@silicalite-1 was used as the support to prepare TiO2-loaded SiO2@silicalite-1 (TiO2@SiO2@silicalite-1). After five loading procedures, it could load 0.44% TiO2 nanoparticles, which is higher than the TiO2 nanoparticle loading in traditional silicalite-1 (0.13%). When the catalysts were used as a catalyst for the degradation of rhodamine B (RhB) aqueous solution under UV light, the photocatalytic efficiency of TiO2@SiO2@silicalite-1 (89.2%) is higher than TiO2@silicalite-1 (only 34.6%). The rate of degradation using TiO2@SiO2@silicalite-1 is 4.3 times faster than that using TiO2@silicalite-1. Furthermore, SiO2@TiO2@silicalite-1 exhibits high stability of photocatalytic performance. After five repeated cycles, the photocatalytic efficiency of TiO2@SiO2@silicalite-1 is 88.09%, which reduces only by 1.1%.
机译：SiO 2 @ smallical @ silicalite-1，使用硅溶胶（pH = 9.47，SiO 2 ≈30wt％）作为二氧化硅源，是在低共熔混合物中直接合成的，该混合物在硅胶的三维网状结构中形成了silicalite-1晶粒，并通过转化无定形SiO 原位生长 2 成MFI型结构，并涂有非晶SiO 2 。碱度，模板剂和结晶时间强烈影响SiO 2 @ silicalite-1的理化性质。通过扫描电子显微镜（SEM），X射线衍射（XRD），透射电子显微镜（TEM），紫外可见漫反射光谱和氮吸附来表征这些样品的理化性质。结果表明，SiO 2 @ silicalite-1是在低共熔混合物中合成的，其理化性质可通过控制氢氧化钠和四丙基溴化铵的含量来调节（ TPABr）。随时间变化的研究表明，形成过程遵循原位外延生长和相变机制。最后，以SiO 2 @ silicalite-1为载体，制备了负载有TiO 2 的SiO 2 @ silicalite-1（TiO 2 @small <@SiO 2 @ silicalite-1）。经过五次加载程序，可以加载0.44％的TiO 2 纳米颗粒，高于TiO 2 纳米颗粒在传统的silicalite-1（0.13％）中加载。紫外光降解罗丹明B（RhB）水溶液时，TiO 2 @SiO 2 @ silicalite-1（89.2％）高于TiO 2 @ smallical @ silicalite-1（仅34.6％）。 TiO 2 @SiO 2 @ silicalite-1的降解速率比使用TiO的降解速率快4.3倍 2 @ silicalite-1。 SiO 2 @TiO 2 @ silicalite-1表现出较高的光催化性能稳定性。经过五个重复循环，TiO 2 @SiO 2 @ silicalite-1的光催化效率为88.09％，仅减少了1.1％。

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