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Chinese Journal of Materials Research  2014, Vol. 28 Issue (2): 100-106    DOI: 10.11901/1005.3093.2013.372
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Preparation and Delaminating of Glycine-Mg3Al LDHs and its Intercalation Compounding with Montmorillonite
Xiaoqian MA,Jinglong ZHOU,Nan LU,Xu WU,Xianmei XIE
College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024
Cite this article: 

Xiaoqian MA,Jinglong ZHOU,Nan LU,Xu WU,Xianmei XIE. Preparation and Delaminating of Glycine-Mg3Al LDHs and its Intercalation Compounding with Montmorillonite. Chinese Journal of Materials Research, 2014, 28(2): 100-106.

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Abstract  

Glycine(Gly)was intercalated into Mg3Al layered double hydroxides(Gly-Mg3Al LDHs)by coprecipitation method. The delaminating of Gly-Mg3Al LDHs in aqueous solution of pH=3~4 was realized by making use of the isoelectric point of Gly. Then Mg3Al LDHs/montmorillonite layered composite was gained through inserting LDHs sheets into montmorillonite. The composite was characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), electrophoresis apparatus and N2-adsorption/desorption measurements. The results show that the formed Gly-Mg3Al LDHs possesses well-defined crystallographic structure. When the raw material ratio is 0.5 (nGly:nNO3-=1:2), the obtained Gly-Mg3Al LDHs exhibits the best performance of delaminating, while the zeta potential of the subsequence colloidal particles is between 35mV and 40mV. Additionally, the translucent colloidal solution may be kept stably for 72h.The interlayer space of the layered composite is 1.44 nm, which is the total thickness of LDHs sheet and montmorillonite sheet. The results prove that LDHs sheets and montmorillonite sheets are layer by layer staggered.

Key words:  inorganic non-metallic materials      glycine      Mg3Al LDHs      delaminating      montmorillonite      intercalation compounding     
Received:  31 May 2013     
Fund: *Supported by National Natural Science Foundation of China No. 50872086 and the Natural Science Foundation of Shanxi Province No. 2012021006-3.

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2013.372     OR     https://www.cjmr.org/EN/Y2014/V28/I2/100

Fig.1  XRD Spectra of Gly-Mg3Al LDHs with different nGly∶nNO3- ratios
Fig.2  XRD Spectra of Gly-Mg3Al LDHs with different pH
Fig.3  schematic model of Gly-Mg3Al LDHs
Fig.4  FT-IR spectrum of Gly-Mg3Al LDHs with different nGly∶nNO3- ratios
Fig.5  FT-IR spectrum of Gly-Mg3Al LDHs with different pH
pH=2 pH=3 pH=4 pH=5 pH=6
Mg3Al LDHs no no no no no
Gly-Mg3Al LDHs no delaminated delaminated no no
Table 1  The effect of pH on the delamination
nGly∶nNO3- Zeta potential / mV
24 h 48 h 72 h 96 h
1∶4 17.683 31.982 coagulated coagulated
1∶3 18.307 27.374 coagulated coagulated
1∶2 35.469 41.099 19.828 coagulated
1∶1 41.835 42.548 21.557 coagulated
1∶0.5 no delaminated no delaminated no delaminated no delaminated
Table 2  The effect of nGly:nNO3- ratios on the delamination
pH Zeta potential / mV
24 h 48 h 72 h 96 h
9 39.752 41.456 21.362 coagulated
10 35.469 41.099 19.828 coagulated
11 38.734 39.907 19.387 coagulated
12 35.255 37.135 20.099 coagulated
Table 3  The effect of pH on the delamination
Fig.6  XRD Spectra of (a) delaminated Gly-Mg3Al LDHs, (b) Gly-Mg3Al LDHs, (c) montmorillonite and (d) Mg3Al LDHs/montmorillonite layer composites
Fig.7  The preparation of Mg3Al LDHs/montmorillonite layer composites
Fig.8  FT-IR spectrum of (a) Gly-Mg3Al LDHs, (b) montmorillonite,(c) simple mixture of Gly-Mg3Al LDHs and montmorillonite and (d) Mg3Al LDHs/montmorillonite layer composites
Sample SBET/(m2g-1) r/nm
montmorillonite 16.05 13.70
Gly-Mg3Al LDHs 2.19 10.66
Mg3Al LDHs/montmorillonite 19.88 12.89
Table 4  BET specific surface area and pore structure of montmorillonite, Gly-Mg3Al LDHs and Mg3Al LDHs/montmorillonite layer composites
Fig.9  N2 absorption-desorption isotherm of Mg3Al LDHs/montmorillonite layer composites
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