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首页> 外文期刊>CHROMATOGRAPHY >Thermal Catalysis Reaction for Self-Surface-Modification of Titania and the Retention Behavior of Resulting Packing Materials in HPLC
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Thermal Catalysis Reaction for Self-Surface-Modification of Titania and the Retention Behavior of Resulting Packing Materials in HPLC

机译：二氧化钛自表面修饰的热催化反应及其在HPLC中的保留材料保留行为

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The titania that was prepared as a packing material in our laboratory, which changed its color on heating, microwave irradiation, and heating under vacuum during nitrogen adsorption. We assumed that the compound adsorbed on titania was oxidized or oxidatively polymerized on heating, leading to the color change. The color faded on heating the sample at 270°C. The catalytic ability of titania is assumed to accelerate its coloration and decoloration. We demonstrated the catalytic ability of titania using glycerol as an adsorbate; silica gel was used as an adsorbent for comparison with titania. Titania accelerated the oxidation or oxidative polymerization of the adsorbate and the decomposition of the oxidized or polymeric compound obtained. Furthermore, the catalysis of titania led to the modification of its surface by adsorbate oxidation or oxidative polymerization; also, surface modification was demonstrated by using glycerol as the adsorbate. Two different modified titania were prepared as packing material by heating the mixture of titania and glycerol at 120°C and 200°C for up to 2 h after coloration. The retention behavior of purine, allopurinol, hypoxanthine, and oxypurinol on these two modified titania and non-modified one was investigated. Oxypurinol eluted faster than hypoxanthine on titania modified at 120°C although it was more strongly retained on non-modified titania than hypoxanthine. Thus, the retention site of oxypurinol is similar to that of glycerol on non-modified titania, that is, the surface modification by glycerol oxidation or oxidative polymerization blocked the site and accelerated its elution. The results could be used for explaining not only the modification of the surface but also the retention mechanism on titania.
机译：在我们的实验室中，作为包装材料制备的二氧化钛在加热，微波辐射和氮吸附过程中在真空加热下会改变其颜色。我们假设吸附在二氧化钛上的化合物在加热时被氧化或氧化聚合，从而导致颜色变化。在将样品加热到270°C时颜色会褪色。假定二氧化钛的催化能力会加速其着色和脱色。我们证明了使用甘油作为吸附物的二氧化钛的催化能力。硅胶用作吸附剂，用于与二氧化钛进行比较。二氧化钛促进了被吸附物的氧化或氧化聚合以及所获得的氧化或聚合化合物的分解。此外，二氧化钛的催化通过吸附物氧化或氧化聚合导致其表面改性。同样，通过使用甘油作为被吸附物证明了表面改性。通过在着色后将二氧化钛和甘油的混合物在120°C和200°C加热2h，制备了两种不同的改性二氧化钛作为填充材料。研究了嘌呤，别嘌醇，次黄嘌呤和羟嘌呤在这两种改性二氧化钛和未改性二氧化钛上的保留行为。在120°C修饰的二氧化钛上，氧杂嘌呤的洗脱速度比次黄嘌呤要快，尽管在非修饰的二氧化钛上，次黄嘌呤的保留力强于次黄嘌呤。因此，氧嘌呤醇的保留位点与未修饰的二氧化钛上的甘油的保留位点相似，即，通过甘油氧化或氧化聚合进行的表面修饰阻止了该位点并加速了其洗脱。结果不仅可以用来解释表面的改性，而且可以用来解释二氧化钛的保留机理。

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