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Intercalative Ion‐Exchange Route to Amino Acid Layered Double Hydroxide Nanohybrids and Their Sorption Properties
Author(s) -
Choi Goeun,
Yang JaeHun,
Park GaYoung,
Vinu Ajayan,
Elzatahry Ahmad,
Yo Chul Hyun,
Choy JinHo
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201403115
Subject(s) - chemistry , hydroxide , sorption , carboxylate , adsorption , layered double hydroxides , inorganic chemistry , amino acid , ion exchange , desorption , amine gas treating , molecule , glutamic acid , fourier transform infrared spectroscopy , carboxylic acid , ion , organic chemistry , chemical engineering , engineering , biochemistry
A soft chemical route to amino acid layered double hydroxide (LDH) nanohybrids was demonstrated on the basis of an intercalative ion‐exchange reaction. Two different amino acids, phenylalanine and glutamic acid, were intercalated and stabilized in the interlayer space of a 2‐dimensional double hydroxide lattice by electrostatic interaction. An attempt was also made to understand the effect of the intracrystalline structure of the amino acid in the LDH on the specific surface area, porosity, and gas sorption properties of the hybrid. According to the X‐ray diffraction analysis, the basal spacings of LDH intercalated with phenylalanine and LDH intercalated with glutamic acid were expanded to 1.80 and 1.22 nm, respectively, relative to that of the pristine Mg 2 Al‐NO 3 ‐LDH (0.88 nm), which indicates that amino acid molecules were successfully intercalated into the LDH. Fourier transform infrared spectra for both samples confirmed that the carboxylic acid group in the amino acid is anionic carboxylate under basic conditions and it eventually interacts with the positively charged LDH surface. From N 2 adsorption/desorption analysis, the BET specific surface area of the LDH intercalated with phenylalanine was found to be twice as large as that for the LDH intercalated with glutamic acid. However, the CO 2 adsorption capacity of the former was determined to be three times more enhanced than that of the latter, due to an enhanced specific surface area and effective amine sites to form carbamates.