Preparation And Properties Of Magnetic X Zeolite

X zeolite behaves excellent properties of shape selective catalysis, molecular sieves and iron-exchange for its unique tunnel structure and large specific surface area. They have been wildly used in many areas such as catalyst in oil industries, gas separation and water treatment. However, there is a common problem no matter they used as catalysts or sorbents, that is, quick seperation of solids and liquids is required in many operations of catalyze and adsorption. In this paper magnetic core has been introduced into the zeolite structure and magnetic zeolite with high stability and adsorption properties have been prepared. Synthesis conditions and adsorption of Pb2+ also have been studied.Magnetization modification on X zeolite has been successfully done by adding precursor of magnetic Fe3O4 TEAOH solution in the zeolite synthesis system. The structure analyses show that Fe3O4 object doesn't damage the crystal structure and tunnel characteristic of zeolite base. Iron doesn't buildup zeolite framework. Fe3O4 have combined with zeolite by chemical bond. Magnetic X zeoite has high thermal stability, whose resistant temperature is about 500℃.This material combined adsorption of zeolite and magnetism of Fe3O4. They can be separated from action system by outer magnetic field, which solves the problem of separation from mother liquid as a result.Magnetic zeolites have been synthesized in different conditions to investigate the effect of preparation conditions on the structure and magnetism of products. It seems higher crystallization temperature or longer crystallization time can lead to better crystallnity while worse magnetic properties. But when the crystallization temperature is over 100℃, crystal transformation appears and the saturation magnetization will rebound. In addition, with the volume of magnetic precursor increasing, the crystallnity descend while the magnetic property rises. The higher value of saturation magnetization among those products is 10.5 emu/g. The product with the better comprehensive properties have been obtained in conditions of 80℃,8 h and 14 mL Fe3O4/TEAOH solution. its saturation magnetization is 5.4 emu/g and monolayer adsorption capacity of Pb2+ per mass sorbent is 414.94 mg/g.Meanwhile, adsorption of magnetic X zeolite on Pb2+ is studied. It can be concluded that magnetic X zeolite have high adsorbability on Pb2+. The Langmuir monolayer adsorption model is better to simulate the adsorption of magnetic zeolite on Pb2+. Adsorption conditions greatly affect the results. When the initial concentration of Pb2+ is 200 mg/L and solid-liquid ratio is 0.2 g/L the adsorption capacity climb the top.The better adsorption time in adsorption process is 2 h.