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Review
. 2019 Jan 8;9(1):80.
doi: 10.3390/nano9010080.

Applications of Mechanochemically Prepared Layered Double Hydroxides as Adsorbents and Catalysts: A Mini-Review

Jun Qu  1 , Lin Sha  2 , Chenjie Wu  3 , Qiwu Zhang  4
Affiliations
Review

Applications of Mechanochemically Prepared Layered Double Hydroxides as Adsorbents and Catalysts: A Mini-Review

Jun Qu et al. Nanomaterials (Basel). .

Abstract

Mechanochemically prepared layered double hydroxide (M-LDH), which usually possesses high surface chemical activity and a substantial amount of surface defects, has presented outstanding application performance especially in the area of environmental protection. Recently published works on the mechanochemical synthesis of LDH were first introduced to provide a comprehensive summary on the preparation of the materials. Ensuing discussion provided an overview of recent research on the applications of M-LDH products as adsorbents and catalysts. The excellent adsorption performance and fast adsorption rate of the precursor of LDH produced by dry milling of raw materials was identified. The catalytic performances of M-LDH as catalysts, mainly photocatalysts, were then introduced. It is foreseeable that by rational utilization of mechanochemical processes and the unique chemical properties of M-LDH, increasing numbers of applications using M-LDH could be expected.

Keywords: application; layered double hydroxides; mechanochemistry; review.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The number of published papers with topics on mechanochemical, mechanochemical, and layered double hydroxide, respectively (literature search in the database of Web of Science).
Figure 2
Figure 2
Illustration of the two-step grinding operation. Reproduced with permission from [3]. Copyright Elsevier, 2016.
Figure 3
Figure 3
X-ray diffraction (XRD) patterns of Ca-Al-CO3 layered double hydroxide (LDH) prepared by a two-step milling operation with different Ca(OH)2/CaCO3/Al(OH)3 molar ratios. Reproduced with permission from [40]. Copyright Elsevier, 2016.
Figure 4
Figure 4
The hydration reaction pathways of C3A (3CaO•Al2O3) fast-hardening cement.
Figure 5
Figure 5
Scanning electron microscope (SEM) images of Li-Al LDH (a) and Ca-Al LDH (b) prepared by the two-step grinding approach.
Figure 6
Figure 6
Illustration of two-step dry grinding and agitation in the water process operation. Reproduced with permission from [12]. Copyright Elsevier, 2017.
Figure 7
Figure 7
Adsorption isotherms of methyl orange (MO) on the precursor (A) and LDH (B). Reproduced with permission from [42]. Copyright Elsevier, 2016.
Figure 8
Figure 8
Cr(VI) adsorption mechanism by the precursor of Ca-Al LDH. Reproduced with permission from [54]. Copyright Elsevier, 2017.
Figure 9
Figure 9
Precursor of Zn-Al LDH for enhanced adsorption and photocatalytic decoloration of MO [56].
See this image and copyright information in PMC

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