Synthesis and characterization of Zn-Al layered double hydroxide |
Paper ID : 1569-UFGNSM-FULL |
Authors: |
parvaneh dalir kheirollahi nezhad *1, Hassan Keypour2, Zolfaghar Rezvani3, Karim Asadpour Zeinali4 1آذربایجان شرقی-تبریز-خ-بیست متری پروین اعتصامی - نبش ده متری هفتم پلاک 13 طبقه دوم 2Faculty of Chemistry, Bu-Ali Sina University,
Hamedan 65174, Iran 3Department of Chemistry, Faculty of Science,
Tarbiat Moallem university of Azarbaijan, Tabriz, Iran 4Faculty of Chemistry, Tabriz University,
Tabriz, Iran |
Abstract: |
In this research nano structure of Zn-Al was synthesized by altering the synthesis conditions. The synthesis conditions particularly influencing the particle size distribution of the layered double hydroxide(LDH) suspensions are temperature, time and pH during the co-precipitation step. Zn-Al-LDH was obtained by co-precipitation method at hydrothermal condition. pH of mixed solution [water(25ml), propanol(5ml) and ethylene glycol(5ml)], contaning Zn(NO3)2.6H2O and Al(NO3)3.9H2O(the ratio is 3:1) with vigorous stirring by addition of NaOH(0.15M) adjust in 7.5. The resulting white precipitate was aged at 120°C for 18 h, and then centrifuged and washed three time with deionized and de-CO2 water. Finally, precipitation was dried in vacuum at 25°C. The prepared LDH was characterized by X-ray diffraction(XRD) and fourier transform infrared spectrometer(FT-IR). The XRD patterns exhibit the characteristic reflections of LDHs with a series of (003), (006), and (009) diffraction peaks, with 2θ of the (003)peak is 9.70 and according to this value we can calculate the basal distance, 4.58A°. In the FT-IR spectra, an intense and broad adsorption band located at 3444 cm-1 was observed, which was attributed to the OH stretching due to the presence of hydroxyl groups and interlayer water molecule of LDH. The absorption peaks at 1380 and 827 cm-1 are due to the presence of nitrate ions.In comparision to normal liquid water, the band has shifted towards lower wave numbers by about 20 cm-1, indicating that this water is present in the LDH interlayer. In the low frequency region, the adsorption peaks correspond to the lattice vibration modes(Al-O, Zn-O, Zn-O-Al). |
Keywords: |
Zn-Al, layered double hydroxide, co-precipitation, hydrothermal, XRD, FT-IR |
Status : Paper Accepted (Poster Presentation) |