高能微波法制备六方氮化硼及其性能研究.pdf

东南大学硕士学位论文 对CR 的吸附效果却逐步减弱。此外，动力学拟合结果表明伪二级动力学模型更适于解 释产物对MB 和CR 的吸附过程，这说明其吸附速率主要受控于化学吸附机制。等温吸 附曲线拟合结果表明吸附过程更符合 Langmuir 模型，且最大吸附量随着温度升高而增 大，说明产物对有机染剂的吸附主要为単分子层吸附，且温度的提升有利于增强吸附性 能。 关键词：六方氮化硼；微波合成；吸附；有机染剂 II Abstract Abstract As a non-metallic material with similar crystal structure to graphite, hexagonal boron nitride (h-BN) has excellent thermal conductivity, high temperature resistance, oxidation resistance, electrical insulation and chemical stability. Therefore, h-BN shows a very broad application prospect in fields of adsorption, ultraviolet laser device, sensor, anti-oxidation coating and so on. But for now, the practical application of h-BN has been still limited by two factors. On the one hand, the related theoretical research needs to be further discussed. On the other hand, the exsisting synthesis approaches have various problems to be resolved and improved, such as harsh conditions, complicated processes, high cost and so on. In this paper, h-BN was efficiently and rapidly synthesized via direct high-energy microwave heating. The structures and morphologies of the samples were characterized by various analytical test methods, and the synthesis mechanism under microwave irradiation was discussed. In addition, the adsorption performances for methylene blue and congo red were analyzed. The effects of experimental conditions containing concentration, temperature and pH on adsorption properties of the product were investigated by setting different comparative tests. The main research contents were shown as follows: (1) The whisker-like h-BN was prepared by high-energy microwave method without catalysts and protective gas. Compared with traditional preparation meth