Multicarboxylic hyperbranched polyglycerol modified SBA-15 for the adsorption of cationic dyes and copper ions from aqueous media
Multicarboxylic hyperbranched polyglycerol modified SBA-15 for the adsorption of cationic dyes and copper ions from aqueous media
复制标题
多羧基超支化聚甘油改性 SBA-15 用于吸附水介质中的阳离子染料和铜离子
DOI：
10.1016/j.apsusc.2012.02.021
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发表时间：
2012-04-15
影响因子：
6.7
通讯作者：
Wei, Zhibo
中科院分区：
文献类型：
--
作者：
Chen, Zhengji;Zhou, Li;Wei, Zhibo
本工作的目的是研究多羧基超支化聚甘油(HPG)修饰的介孔SBA-15(SBA/HPG-COOH)作为吸附剂从水介质中去除阳离子染料或/和重金属离子的潜力。SBA/HPG-COOH吸附剂可通过缩水甘油的原位阴离子开环聚合和琥珀酸酐对羟基的进一步修饰两步合成。用红外光谱、热重分析、X射线衍射仪、扫描电子显微镜和氮气吸附-脱附等温线对所制得的SBA/HPG-COOH进行了表征。结果表明，成功地合成了SBA/HPG-COOH，计算出SBA/HPG-COOH表面的羧基密度高达1.5 mmol/g，为阳离子吸附剂的吸附提供了强有力的基础。以四种染料和铜离子为代表考察了SBA/HPG-COOH的吸附性能。SBA/HPG-COOH吸附剂具有吸附速度快、吸附容量大(对亚甲基蓝的饱和吸附容量可达0.50 mmol/g，而对未改性的SBA-15的饱和吸附容量小于0.05 mmol/g)、对阳离子的选择性高等特点。考察了Langmuir吸附模型和准二级动力学模型对SBA/HPG-COOH对MB染料的吸附等温线和吸附动力学的适用性。相信这种强韧的SBA/HPG-COOH吸附剂将在去除水溶液中的阳离子吸附物方面有重要的应用。(C)2012爱思唯尔B.V.保留所有权利。
The aim of the present work was to investigate the potential of multicarboxylic hyperbranched polyglycerol (HPG) modified mesoporous SBA-15 (SBA/HPG-COOH) as adsorbent for the removal of cationic dyes or/and heavy metal ions from aqueous media. The SBA/HPG-COOH adsorbents can be facilely synthesized through two steps: in situ anionic ring-opening polymerization of glycidol and further modification of hydroxyl groups by succinic anhydride. The resulting SBA/HPG-COOH was characterized by means of FTIR, TGA, XRD, SEM and nitrogen adsorption-desorption isotherms. The results demonstrate that the SBA/HPG-COOH was successfully synthesized and the density of carboxylic groups on the SBA/HPG-COOH is calculated to be as high as 1.5 mmol/g, posing a powerful base for adsorbing cationic adsorbates. Four kinds of dyes and copper ions were chosen as representatives to investigate the adsorption ability of SBA/HPG-COOH. The SBA/HPG-COOH adsorbent showed quick adsorption rate, high adsorption capacity (e.g., its saturated adsorption capacity for methylene blue (MB) can reach 0.50 mmol/g, while for unmodified SBA-15 is lower than 0.05 mmol/g), and high selectivity for cationic adsorbates. The fitness of Langmuir adsorption model and pseudo second-order kinetics on describing the adsorption isotherm and kinetics of SBA/HPG-COOH for MB dye was examined, respectively. It is believed that this robust SBA/HPG-COOH adsorbent will find important application in removal of cationic adsorbates from aqueous solution. (c) 2012 Elsevier B.V. All rights reserved.