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Mesoporous Silica Based Catalysts for the Oxidation of Azodyes in Waste Water

机译：介孔二氧化硅基催化剂用于废水中叠氮化物的氧化

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摘要

Iron-containing catalysts supported on mesoporous silica samples that differ in the methods of their preparation (commercial KSS silica gel, MSM-41 mesoporous silicalite, and silica gels obtained under laboratory conditions by means of spray drying and drying in supercritical СО_2) are synthesized. Their porous structure is studied via low-temperature nitrogen adsorption. Their catalytic activity and stability in the oxidation of carmoisine (an anionic dye) with a 3% hydrogen peroxide solution in water at 60°C and рН 3 are compared. The initial carmoisine and catalyst concentrations in solution are 20 mg/L and 3 g/L, respectively, and the molar Н_2О_2/carmoisine ratio is 459/1. The KSS-based catalyst demonstrates the highest activity and stability with respect to the outwashing of an active component into a solution: the conversion of carmoisine on this catalyst is as high as 99% for 30 min, while the concentration of iron ions in solution (0.27 mg/L) does not exceed the maximum allowable concentration. After the support is preimpregnated with aluminum, the degree of iron outwashing into a solution is more than halved. The synthesized catalysts are of interest with regard to the purification of waste water containing organic admixtures.
机译：合成了负载在介孔二氧化硅样品上的含铁催化剂，这些样品的制备方法不同（商业KSS硅胶，MSM-41介孔二氧化硅和在实验室条件下通过喷雾干燥和在超临界СО_2中干燥获得的硅胶）。通过低温氮吸附研究了它们的多孔结构。比较了它们在60％的水和рН3中的3％过氧化氢水溶液中对卡莫伊辛（一种阴离子染料）的氧化中的催化活性和稳定性。溶液中的初始carmoisine和催化剂浓度分别为20 mg / L和3 g / L，且Н_2О_2/ carmoisine的摩尔比为459/1。基于KSS的催化剂在将活性成分洗出到溶液中方面表现出最高的活性和稳定性：在30分钟的时间里，该催化剂上的Carmoisine转化率高达99％，而溶液中铁离子的浓度（ 0.27 mg / L）不超过最大允许浓度。在用铝预先浸渍载体后，铁在溶液中的冲洗程度降低了一半以上。合成的催化剂对于净化包含有机混合物的废水是令人感兴趣的。

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