以氯球为原料,二氯乙烷为溶剂,FeCl_3为催化剂,利用Friedel-Crafts反应制备甲苯超高交联树脂,测其氯含量为6.38%。为降低氯含量和提高吸附性能,采用2-氨基吡啶对该高交联树脂进行化学修饰,获得的高交联树脂(记为GQ-08)氯含量下降为1.36%...以氯球为原料,二氯乙烷为溶剂,FeCl_3为催化剂,利用Friedel-Crafts反应制备甲苯超高交联树脂,测其氯含量为6.38%。为降低氯含量和提高吸附性能,采用2-氨基吡啶对该高交联树脂进行化学修饰,获得的高交联树脂(记为GQ-08)氯含量下降为1.36%,然后详细研究了GQ-08对水杨酸的吸附性能。实验结果表明,GQ-08在p H 2.75时对水杨酸的吸附容量最大,达到310.7 mg·g^(-1);GQ-08对水杨酸的吸附是放热过程,吸附等温线服从Freundlich方程;当溶液中NaCl含量由0%到2%变化时,GQ-08对水杨酸的吸附量明显减少,说明氯离子与水杨酸存在竞争吸附作用,增加盐度不利于水杨酸吸附。因此,在利用GQ-08树脂进行水杨酸富集分离或处理生产废水回收水杨酸时应优先考虑酸度、盐度等工艺参数。展开更多
Excellent results have been achieved in the Cu（OAc）2-catalyzed Sonogashira cross-couplings of aryl iodides and activated aryl bromides utilizing TBAF （tetrabutylammonium fluoride） as the base and 4,6-dimethoxypyri...Excellent results have been achieved in the Cu（OAc）2-catalyzed Sonogashira cross-couplings of aryl iodides and activated aryl bromides utilizing TBAF （tetrabutylammonium fluoride） as the base and 4,6-dimethoxypyrimidin-2-amine as the ligand. It is noteworthy that the reaction is conducted under aerobic, solvent-free and palladium-free conditions.展开更多
文摘以氯球为原料,二氯乙烷为溶剂,FeCl_3为催化剂,利用Friedel-Crafts反应制备甲苯超高交联树脂,测其氯含量为6.38%。为降低氯含量和提高吸附性能,采用2-氨基吡啶对该高交联树脂进行化学修饰,获得的高交联树脂(记为GQ-08)氯含量下降为1.36%,然后详细研究了GQ-08对水杨酸的吸附性能。实验结果表明,GQ-08在p H 2.75时对水杨酸的吸附容量最大,达到310.7 mg·g^(-1);GQ-08对水杨酸的吸附是放热过程,吸附等温线服从Freundlich方程;当溶液中NaCl含量由0%到2%变化时,GQ-08对水杨酸的吸附量明显减少,说明氯离子与水杨酸存在竞争吸附作用,增加盐度不利于水杨酸吸附。因此,在利用GQ-08树脂进行水杨酸富集分离或处理生产废水回收水杨酸时应优先考虑酸度、盐度等工艺参数。
基金Project supported by the Key Project of Chinese Ministry of Education （No. 206102）, Fok Ying Dong Education Foundation （No. 101012）, Scientific Research Fund of Hunan Provincial Education Department （No. 05B038）, Hunan Provincial Natural Science Foundation of China （No. 05JJ1002） and the National Natural Science Foundation of China （Nos. 20572020 and 20202002）
文摘Excellent results have been achieved in the Cu（OAc）2-catalyzed Sonogashira cross-couplings of aryl iodides and activated aryl bromides utilizing TBAF （tetrabutylammonium fluoride） as the base and 4,6-dimethoxypyrimidin-2-amine as the ligand. It is noteworthy that the reaction is conducted under aerobic, solvent-free and palladium-free conditions.
