活性炭纤维的热处理及其氧化还原吸附银的研究

STUDY ON THE THERMAL TREATMENT OF ACF AND THEIR REDOX ADSORPTION FOR Ag +

剑麻基磷酸化学活化活性炭纤维（ＳＡＣＦＰ）在惰性气氛中热处理后，纤维表面的化学结构和物理形态发生改变。随处理温度升高，Ｏ／Ｃ比先减小再略有回升，而比表面积增大。ＸＰＳ分析表明纤维的Ｃ１ｓ，Ｏ１ｓ峰位基本不变，与碳相关的含氧官能团总量有一低谷，与元素分析的结果一致，Ｏ１ｓ峰在低结合能端出现明显的肩峰变化；而Ｐ２ｐ峰位向低结合能方向移动，Ｐ／Ｃ比则出现一峰值。实验表明：纤维比表面积比氧化还原吸附前有所增大；且随热处理温度升高，对Ａｇ＋的还原吸附量增大，并趋于定值，所得纳米银的平均晶粒尺寸略有减小。

Chemical structure and physical morphology of the surface of SACF p (sisal fiber based activated carbon fibers chemically activated by H 3PO 4) changed after thermally treated in inert atmosphere. As the temperature of thermal treatment increased, the ratio of oxygen to carbon decreased at first and then slightly increased, whereas the specific surface area of SACF p increased.The results of XPS indicated that the peak position of C1s and O1s almost fixed; as the result of elemental analysis, the content of the oxygen containing groups related to carbon appeared a low valley; and the obvious change of shoulder peak presented in the lower binding energy part of O1s. When the peak position of P2p moved to lower energy, the ratio of phosphorus to carbon increased at first and then decreased. The experimental results showed that the specific surface area of SACF p increased after redox adsorption. The reductive adsorption increased with the increase of temperature and inclined to be a constant.The mean crystal size of nano silver slightly decreases.