School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen, Jiangxi Province, China.
J Colloid Interface Sci. 2012 Mar 1;369(1):388-94. doi: 10.1016/j.jcis.2011.12.024. Epub 2011 Dec 16.
In this study, rice husk, an abundant agricultural byproduct, was utilized as an alternative silica source for the synthesis of MCM-22. The zeolite with high crystalline was synthesized using a three-stage varying-temperature hydrothermal method. The prepared silica and MCM-22 were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results showed that the duration required for zeolite crystallization was significantly decreased under varying-temperature conditions. The MCM-22 was in the form of thin platelet-like crystals, and no amorphous material existed in the framework of the MCM-22 after calcination and ammonium exchange. Cationic brilliant red 5GN, a basic dye used in the wool and blanket factories for fiber dyeing, was selected as the adsorptive to study the adsorption performance of the MCM-22. Adsorption experiments indicated that the maximum extent of adsorption was obtained at pH of 10, contact time of 60 min, and MCM-22 dose of 1.0 g/L. The adsorption kinetic has been described by first-order and pseudo-second-order models. It was observed that the rate of dye adsorption followed pseudo-second-order model.
在这项研究中，稻壳作为一种丰富的农业副产品，被用作合成 MCM-22 的替代硅源。使用三阶段变温水热法合成了具有高结晶度的沸石。通过 X 射线衍射、扫描电子显微镜和透射电子显微镜对制备的二氧化硅和 MCM-22 进行了表征。结果表明，在变温条件下，沸石结晶所需的时间明显缩短。MCM-22 呈薄片状晶体，煅烧和铵交换后，MCM-22 的骨架中不存在无定形物质。阳离子艳红 5GN 是毛纺和毛毯厂用于纤维染色的碱性染料，被选为吸附剂来研究 MCM-22 的吸附性能。吸附实验表明，在 pH 值为 10、接触时间为 60 分钟和 MCM-22 剂量为 1.0 g/L 的条件下，吸附达到最大程度。吸附动力学可以用一级和准二级模型来描述。观察到染料吸附速率遵循准二级模型。
