改性颗粒白土对玉米秸秆稀酸水解液脱色的研究

摘要

采用酸化焙烧法对凹凸棒土进行了改性，通过单因素试验对其制备条件进行了优化，且采用N2吸附-脱附、 X射线衍射、扫描电镜等表征手段对其脱色机理进行了研究。试验结果表明，经400℃焙烧1.5 h、15%酸化后的颗粒白土对玉米秸秆稀酸水解液的脱色效果最佳；酸活化可除去凹土中的杂质，增加孔道，置换其金属离子，改善表面特性；焙烧热活化可除去不同状态的水，疏通其通道，增大孔容和比表面积，从而提高其吸附脱色能力。%The acidified calcined method was adapted to the modified attapulgite, and the optimized preparation con-ditions were obtained by the single factor experiment. The decoloring mechanism of particle clay was studied by BET, XRD, FE-SEM and so on. Result showed that the decolorization rate was best with calcination temperature 400℃, 1.5 hours ,and sulfuric acid concentration 15%. The acid activation could remove the impurity of the attapulgite to increase the channel and replace the metal ions to improve the surface properties;moreover the calcining thermal activation could remove the water during the attapulgite, and that could dredge the channel, increase the pore volume and the specific surface area, so as to improve the adsorption decolorizing ability of the particle clay.