Multicarboxylic hyperbranched polyglycerol modified SBA-15 for the adsorption of cationic dyes and heavy metal ions from aqueous media
作者：Zhengji Chen, Li Zhou*, Faai Zhang*, Chuanbai Yu, Guanghui Ma, Qingcheng He
關(guān)鍵字：SBA-15 Hyperbranched polyglycerol Adsorption Dyes Copper ions
論文來(lái)源：期刊
具體來(lái)源：Applied Surface Science
發(fā)表時(shí)間：2012年
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