writer：Zhengji Chen, Li Zhou*, Faai Zhang*, Chuanbai Yu, Guanghui Ma, Qingcheng He
keywords：SBA-15 Hyperbranched polyglycerol Adsorption Dyes Copper ions
source：期刊
specific source：Applied Surface Science
Issue time：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