以玉米芯纤维浆为原料,在不同磷酸浓度下采用微波法制备了3种生物质活性炭,考察生物质活性炭对印染废水的吸附性能,并研究生物质活性炭的等温吸附、动力学吸附特性。结果表明:玉米芯纤维浆经30 mL 60%磷酸活化,制备的生物质活性炭吸附...以玉米芯纤维浆为原料,在不同磷酸浓度下采用微波法制备了3种生物质活性炭,考察生物质活性炭对印染废水的吸附性能,并研究生物质活性炭的等温吸附、动力学吸附特性。结果表明:玉米芯纤维浆经30 mL 60%磷酸活化,制备的生物质活性炭吸附性能最佳,该活性炭比表面积为250.534 m2/g,总孔体积为1.914 cm3/g。生物质活性炭易吸附模拟印染废水中的甲基橙和酸性大红GR,对甲基橙和酸性大红GR的去除率分别为99.64%和98.71%。生物质活性炭的等温吸附更接近Langmuir模型,吸附方式更接近于单分子层吸附,动力学吸附更符合拟二级动力学方程。展开更多
Biodiesel was used to prepare epoxidized fatty acid isobutyl esters(Ep-FABEs)as a biobased plasticizer in this work.Transesterification of biodiesel with isobutanol catalyzed by tetrabutyl titanate was carried out in ...Biodiesel was used to prepare epoxidized fatty acid isobutyl esters(Ep-FABEs)as a biobased plasticizer in this work.Transesterification of biodiesel with isobutanol catalyzed by tetrabutyl titanate was carried out in a gas-liquid tower reactor.The conversion achieved nearly 100%within 5 h under the reaction temperature,the mass ratio of catalyst to fatty acid methyl esters(FAMEs),and isobutanol to FAMEs total molar ratio of 180℃,0.4%(mass),and 5.4:1,respectively.In addition,kinetic model of the transesterification reaction was developed at 150–190℃.The calculated activation energy was 48.93 kJ·mol^(-1).Then,the epoxidation of obtained fatty acid isobutyl esters(FABEs)was conducted in the presence of formic acid and hydrogen peroxide.The Ep-FABEs was further analyzed for its plasticizing effectiveness to replace dioctyl phthalate(DOP)and compared with conventional epoxy plasticizer epoxidized fatty acid methyl esters(Ep-FAMEs).The results indicated that the thermal stability and mechanical properties of PVC films with Ep-FABEs plasticizer were significantly improved compared with those plasticized with DOP.In addition,the extraction resistance and migration stability of Ep-FABEs were better than those of EpFAMEs.Overall,the prepared Ep-FABEs via structural modification of biodiesel proved to be a promising biobased plasticizer.展开更多
文摘以玉米芯纤维浆为原料,在不同磷酸浓度下采用微波法制备了3种生物质活性炭,考察生物质活性炭对印染废水的吸附性能,并研究生物质活性炭的等温吸附、动力学吸附特性。结果表明:玉米芯纤维浆经30 mL 60%磷酸活化,制备的生物质活性炭吸附性能最佳,该活性炭比表面积为250.534 m2/g,总孔体积为1.914 cm3/g。生物质活性炭易吸附模拟印染废水中的甲基橙和酸性大红GR,对甲基橙和酸性大红GR的去除率分别为99.64%和98.71%。生物质活性炭的等温吸附更接近Langmuir模型,吸附方式更接近于单分子层吸附,动力学吸附更符合拟二级动力学方程。
基金Financial support provided by the National High-tech Research and Development Program of China(2014AA022103)。
文摘Biodiesel was used to prepare epoxidized fatty acid isobutyl esters(Ep-FABEs)as a biobased plasticizer in this work.Transesterification of biodiesel with isobutanol catalyzed by tetrabutyl titanate was carried out in a gas-liquid tower reactor.The conversion achieved nearly 100%within 5 h under the reaction temperature,the mass ratio of catalyst to fatty acid methyl esters(FAMEs),and isobutanol to FAMEs total molar ratio of 180℃,0.4%(mass),and 5.4:1,respectively.In addition,kinetic model of the transesterification reaction was developed at 150–190℃.The calculated activation energy was 48.93 kJ·mol^(-1).Then,the epoxidation of obtained fatty acid isobutyl esters(FABEs)was conducted in the presence of formic acid and hydrogen peroxide.The Ep-FABEs was further analyzed for its plasticizing effectiveness to replace dioctyl phthalate(DOP)and compared with conventional epoxy plasticizer epoxidized fatty acid methyl esters(Ep-FAMEs).The results indicated that the thermal stability and mechanical properties of PVC films with Ep-FABEs plasticizer were significantly improved compared with those plasticized with DOP.In addition,the extraction resistance and migration stability of Ep-FABEs were better than those of EpFAMEs.Overall,the prepared Ep-FABEs via structural modification of biodiesel proved to be a promising biobased plasticizer.
