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钴铬层状双氢氧化物、α-和β-氢氧化钴以及无定形氢氧化铬：合成、改性与表征

Cobalt chromium-layered double hydroxide, α- and β- Co(OH) and amorphous Cr(OH): synthesis, modification and characterization.

作者信息

Balayeva Ofeliya O, Azizov Abdulsaid A, Muradov Mustafa B, Alosmanov Rasim M, Eyvazova Goncha M, Mammadyarova Sevinj J

机构信息

Department of Chemistry, Baku State University, Z. Khalilov str., 23, AZ-1148 Baku, Azerbaijan.

Department of Physics, Baku State University, Z. Khalilov str., 23, AZ-1148 Baku, Azerbaijan.

出版信息

Heliyon. 2019 Nov 14;5(11):e02725. doi: 10.1016/j.heliyon.2019.e02725. eCollection 2019 Nov.

DOI:10.1016/j.heliyon.2019.e02725
PMID:31763468
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6861585/
Abstract

Cobalt-chromium layered double hydroxide (CoCr LDH), α- and β- Co(OH) and amorphous Cr(OH) have been synthesized under different reaction conditions. The obtained CoCr LDH was modified by stearic acid (SA) and sodium stearate (SS). The obtained samples have been characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM), Ultraviolet-visible- (UV-Vis), Fourier transform infrared- (FTIR) and Energy-dispersive X-ray- (EDX) spectroscopy. The influence of reaction conditions on product composition, structural and optical properties of the samples have been discussed in detail. The basal spacing of CoCr-LDH increased from 7.366 Å to 7.428 Å and 25.214Å after the intercalation by stearic acid and sodium stearate, respectively. The average particles size by SEM analyze was estimated to be approximately 100-150 nm and 30-50 nm for CoCr-LDH and CoCr-LDH/SS nanostructures, respectively. Mixed hydroxides like α- and β- Co(OH) have been obtained along with LDH at lower pH value (pH ∼ 7). The number of diffraction peaks corresponding to β-Co(OH) has increased with relatively decreasing of Co ions in the reaction medium. At high chromium concentrations (Co:Cr = 1:3 and 1:5), amorphous Cr(OH) were formed in the experiment.

摘要

在不同反应条件下合成了钴铬层状双氢氧化物（CoCr LDH）、α-和β- Co(OH) 以及无定形Cr(OH)。所得CoCr LDH用硬脂酸（SA）和硬脂酸钠（SS）进行了改性。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、紫外可见（UV-Vis）、傅里叶变换红外（FTIR）和能量色散X射线（EDX）光谱对所得样品进行了表征。详细讨论了反应条件对样品的产物组成、结构和光学性质的影响。硬脂酸和硬脂酸钠插层后，CoCr-LDH的层间距分别从7.366 Å增加到7.428 Å和25.214 Å。通过SEM分析估计，CoCr-LDH和CoCr-LDH/SS纳米结构的平均粒径分别约为100-150 nm和30-50 nm。在较低pH值（pH ∼ 7）下，除了LDH还获得了α-和β- Co(OH) 等混合氢氧化物。随着反应介质中Co离子相对减少，对应β-Co(OH) 的衍射峰数量增加。在高铬浓度（Co:Cr = 1:3和1:5）下，实验中形成了无定形Cr(OH)。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/85ab/6861585/aacd69158158/gr5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/85ab/6861585/41f8994257aa/gr1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/85ab/6861585/01cefbf99e5d/gr2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/85ab/6861585/327562c0cedc/gr3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/85ab/6861585/a3b1a6e71f38/gr4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/85ab/6861585/aacd69158158/gr5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/85ab/6861585/41f8994257aa/gr1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/85ab/6861585/01cefbf99e5d/gr2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/85ab/6861585/327562c0cedc/gr3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/85ab/6861585/a3b1a6e71f38/gr4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/85ab/6861585/aacd69158158/gr5.jpg

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