运用数学模型对复合膜的等温吸湿曲线进行拟合,研究液体石蜡对麦麸纤维/小麦麸质蛋白复合膜吸湿性能、透水性能的影响,并测定其机械性能和光学性能变化。结果表明,复合膜的等温吸湿动力学过程符合Peleg模型( R^2 >0.97, E <5%),GA...运用数学模型对复合膜的等温吸湿曲线进行拟合,研究液体石蜡对麦麸纤维/小麦麸质蛋白复合膜吸湿性能、透水性能的影响,并测定其机械性能和光学性能变化。结果表明,复合膜的等温吸湿动力学过程符合Peleg模型( R^2 >0.97, E <5%),GAB模型能精确模拟复合膜的吸附等温线( R^2 >0.99, E <5%)。添加5%~20%的液体石蜡可降低复合膜平衡吸湿率和水蒸气透过系数(water vapor permeability,WVP),提高复合膜的水接触角,其中添加15%的液体石蜡所制备的复合膜WVP降低了约47.8%,水接触角从54.2°提高至88.9°。添加液体石蜡同时降低了复合膜的抗拉强度(tensile strength,TS)、断裂延伸率(elongation at break,EAB)和透明度,加深了复合膜的色泽。添加15%液体石蜡的复合膜TS、EAB和透明度与对照相比分别降低了约49.1%、33.5%和71.6%。综合添加液体石蜡对复合膜的各项性能影响,推荐15%左右液体石蜡为适宜添加量。本研究结果可为液体石蜡/麦麸纤维/小麦麸质蛋白复合膜制备工艺参数的进一步优化提供参考。展开更多
Reaction feed was prepared by dissolving diben-zothiophene(DBT),which was selected as a model organo-sulfur compound in diesel fuels,in n-octane.The oxidant was a 30 wt-%aqueous solution of hydrogen peroxide.Catalytic...Reaction feed was prepared by dissolving diben-zothiophene(DBT),which was selected as a model organo-sulfur compound in diesel fuels,in n-octane.The oxidant was a 30 wt-%aqueous solution of hydrogen peroxide.Catalytic performance of the activated carbons with saturation adsorp-tion of DBT was investigated in the presence of formic acid.In addition,the effects of activated carbon dosage,formic acid concentration,initial concentration of hydrogen perox-ide,initial concentration of DBT and reaction temperature on the oxidation of DBT were investigated.Experimental results indicated that performic acid and the hydroxyl radicals pro-duced are coupled to oxidize DBT with a conversion ratio of 100%.Catalytic performance of the combination of activated carbon and formic acid is higher than that of only formic acid.The concentration of formic acid,activated carbon dosage,initial concentration of hydrogen peroxide and reaction temperature affect the oxidative removal of DBT.The higher the initial concentration of DBT in the n-octane solution,the more difficult the deep desulfurization by oxidation is.展开更多
文摘运用数学模型对复合膜的等温吸湿曲线进行拟合,研究液体石蜡对麦麸纤维/小麦麸质蛋白复合膜吸湿性能、透水性能的影响,并测定其机械性能和光学性能变化。结果表明,复合膜的等温吸湿动力学过程符合Peleg模型( R^2 >0.97, E <5%),GAB模型能精确模拟复合膜的吸附等温线( R^2 >0.99, E <5%)。添加5%~20%的液体石蜡可降低复合膜平衡吸湿率和水蒸气透过系数(water vapor permeability,WVP),提高复合膜的水接触角,其中添加15%的液体石蜡所制备的复合膜WVP降低了约47.8%,水接触角从54.2°提高至88.9°。添加液体石蜡同时降低了复合膜的抗拉强度(tensile strength,TS)、断裂延伸率(elongation at break,EAB)和透明度,加深了复合膜的色泽。添加15%液体石蜡的复合膜TS、EAB和透明度与对照相比分别降低了约49.1%、33.5%和71.6%。综合添加液体石蜡对复合膜的各项性能影响,推荐15%左右液体石蜡为适宜添加量。本研究结果可为液体石蜡/麦麸纤维/小麦麸质蛋白复合膜制备工艺参数的进一步优化提供参考。
文摘Reaction feed was prepared by dissolving diben-zothiophene(DBT),which was selected as a model organo-sulfur compound in diesel fuels,in n-octane.The oxidant was a 30 wt-%aqueous solution of hydrogen peroxide.Catalytic performance of the activated carbons with saturation adsorp-tion of DBT was investigated in the presence of formic acid.In addition,the effects of activated carbon dosage,formic acid concentration,initial concentration of hydrogen perox-ide,initial concentration of DBT and reaction temperature on the oxidation of DBT were investigated.Experimental results indicated that performic acid and the hydroxyl radicals pro-duced are coupled to oxidize DBT with a conversion ratio of 100%.Catalytic performance of the combination of activated carbon and formic acid is higher than that of only formic acid.The concentration of formic acid,activated carbon dosage,initial concentration of hydrogen peroxide and reaction temperature affect the oxidative removal of DBT.The higher the initial concentration of DBT in the n-octane solution,the more difficult the deep desulfurization by oxidation is.
