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本论文采用柠檬酸浸泡的方式处理稻壳,并使用高温煅烧的方法除去稻壳中的有机物。得到无定型态的二氧化硅,通过30分钟的恒定热处理时间以及不同的煅烧温度探究最适宜的稻壳处理温度。实验结果表明:稻壳经600℃及以上、恒温30分钟处理,可以制得较为纯净,白色的无定型态二氧化硅;使用KH-570(γ-甲基丙烯酰氧基丙基三甲氧基硅烷)作为硅烷偶联剂对其进行化学改性,红外光谱图表明偶联剂已经成功的连接在了无定型态二氧化硅上;利用扫描电镜及透射电镜观察二氧化硅表面形貌,证实了纳米二氧化硅的成功制备。
In this paper, the rice husk was treated with citric acid soaking, and the organic matter in the husk was removed by high temperature calcination. The amorphous form of silica was obtained and the optimum temperature for the hull processing was explored with a constant heat treatment time of 30 minutes and different calcination temperatures. The experimental results show that the rice hulls can be made into more pure and white amorphous silica by the treatment of 600 ℃ and above for 30 minutes, KH-570 (γ-methacryloxypropyltrimethoxy Silane) as a silane coupling agent to its chemical modification, infrared spectroscopy showed that the coupling agent has been successfully connected to the amorphous state of silica; Scanning electron microscopy and transmission electron microscopy of silica surface morphology , Confirmed the successful preparation of nano-silica.