Mid- and near-infrared spectroscopic investigation of homogeneous cation distribution in MgxZnyAl(x plus y)/2-layered double hydroxide (LDH)

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:411

Article

Zhang, Jia¹  Su, Huimin¹  Zhou, Jizhi¹  Qian, Guangren¹  Xu, Zhiping²  Xi, Yunfei³  Xu, Yunfeng¹  Theiss, Frederick L.³  Frost, Ray³ 

[1] Shanghai Univ, Sch Environm & Chem Engn, Shanghai 200444, Peoples R China

[2] Univ Queensland, Australian Inst Bioengn & Nanotechnol, ARC Ctr Excellence Funct Nanomat, Brisbane, Qld 4072, Australia

[3] Queensland Univ Technol, Fac Sci & Engn, Sch Chem Phys & Mech Engn, Brisbane, Qld 4001, Australia

关键词: Layered double hydroxide;    Homogeneous;    Cation distribution;    MIR;    NIR;   

DOI  :  10.1016/j.jcis.2013.08.008

来源: Elsevier

【 摘 要 】

In this report, a detailed FTIR fitting analysis was used to recognize Mg, Zn and Al homogeneous distribution in MgxZnyAl(x+y)/2-Layered double hydroxide (LDH) hydroxyl layer. In detail, OH-Mg2Al:OH-Mg-3 ratios decreased from 95.2:4.8 (MIR) and 94.2:5.8.(NIR) to 58.9:41.1 (MIR) and 61.8:38.2 (NIR), when Mg:Al increased from 2.2:1.0 to 4.1:1.0 in MgAl-LDHs. These fitting results were similar with theoretical calculations of 94.3:5.7 and 59.0:41.0. In a further analysis of MgxZnyAl(x+y)/2-LDHs, OH bonded Zn2Mg, Zn2Al, MgZnAl, Mg2Al and Mg2Zn peaks were identified at 3420, 3430, 3445-3450, 3454 and 3545 cm(-1), respectively. With the decrease of Mg:Zn from 3:1 to 1:3, metal-hydroxyl bands changed from OH-Mg2Al and MgZnAl (with a ratio of 49.4:50.6) to OH-MgZnAl and Zn2Al (with a ratio of 55.0:45.0). They were also similar with theoretical calculations of 47.6:52.4 and 54.6:45.4. As a result, these results show that there is an ordered cation distribution in MgxZnyAl(x+y)/2-LDH, and FTIR is feasible in recognizing this structure. (C) 2013 Elsevier Inc. All rights reserved.

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