防潮活性炭的制备及防潮性能研究

Study on preparation and moisture resistance of activated carbon

为提高活性炭防潮能力,减小净化空气时对环境湿度的影响,配制全氟辛基三乙氧基硅烷甲醇溶液,并对椰壳活性炭表面进行氟化改性。利用SEM、EDS、BET等手段进行表征,结果表明,单体F8261通过化学键作用结合在活性炭表面,实现了疏水性,且对孔隙结构影响极小。在相对湿度为90%的湿润环境中,测得增重比差值最大可达13%;水浸泡后,测得吸附系数差值最大可到203.26mg/g。证明了氟化处理对提高活性炭防潮能力具有一定的现实意义。

To achieve the humidity resistance, and reduce the impact on the environmental humidity when cleaning the air. triethoxy-1 H, 1 H, 2 H, 2 H-perfluorooctylsilane and methanol was blended, and the solution was used to fluorinating the coconut shell activated carbon. Structure and morphology of the activated carbon was obtained through SEM, EDSand BET. The results showed that molecules sticked to the surface and closed together with chemical bonds, it was well hydro- phobic to water, but made no appreciable difference to pore structure. Measured the weight gain ratio of the activated carbon before and after fluorination in the relative humidity of 90% ,the difference could reach a maximum of 13%. Measured the water adsorption coefficient after soaked in water, the difference could reach a maximum of 203.26mg/g. They all proved that fluorination treatment was of certain significance in improving the moisture capacity of activated carbon.