Hydrotalcites in Construction Materials

Abstract

Hydrotalcites are layered double hydroxides displaying a variety of stoichiometry caused by the different arrangement of the stacking of the layers, ordering of the metal cations, as well as the arrangement of anions and water molecules, in the interlayer galleries. The compounds of the hydrotalcite group show a wide range of the possible applications due to their specific properties, such as their large surface area, ion exchange ability, the insolubility in water and most of the organic sorbents, and others. Affordability, wide possibilities of manufacturing, and presence of sufficient natural deposits make hydrotalcites potentially very useful for the construction industry, as either a building material itself or an additive in mortars, concrete or in polymers composites used in constructions. Similar possible application of such material is in leakage control in a radioactive waste repository. The effect of use of these materials for ion exchange, anti-corrosion protection, radioactive ions containment, and similar purposes in building materials is examined in this review.

Review of the Application of Hydrotalcite as CO2 Sinks for Climate Change Mitigation

“…Figure 1 shows two diagrams representing what happens during the calcination of hydrotalcite of Mg 3 AlCO 3 as shown (A) by W.J. Long et al [77] and (B) by Lauermannová et al [73]. Both schemes attempt to represent the collapse of the structure due to the loss of interlayer anions and moisture.…”

“…After calcination, a large number of active sites produced what in favour of the improvement effect of CLDH on cement [72]. Since hydrotalcites may be incorporated into various building material mixtures, mortars, concretes and backfills, their application as accessible and affordable materials is prospective [73][74][75]. However, research in the field of hydrotalcites and cementbased materials is still insufficient [72,76].…”

Raman Spectroscopy for Characterization of Hydrotalcite-like Materials Used in Catalytic Reactions

“…Electrochemical capacitors, or supercapacitors, based on LDHs also have been studied as novel and sustainable energy storage technology [46]. Furthermore, the structural characteristics of hydrotalcite-like materials are identified as suitable for use as building materials in the construction industry in addition to factors such as low cost and high availability in mineral reserves [47]. Thus, LDHs find applications in these and in several other fields of research.…”

Synthesis and characterization of two-dimensional (2D) nanosheet zinc aluminum layered double hydroxide (Zn/Al LDH) via an alkali-free route

“…x (OH)2] [(A m-)x/m]. nH2O [1], [2]. It has high catalytic activity and selectivity since it consists of two or more transition metal cations that are not clustered and distributed uniformly in the hydroxide layer.…”

“…It has high catalytic activity and selectivity since it consists of two or more transition metal cations that are not clustered and distributed uniformly in the hydroxide layer. This uniqueness contributes to LDH feasibility to act as a precursor in the preparation of nanocatalyst [2]. Several methods have been discovered to synthesis the LDH, such as the sol-gel method, ion-exchange method, alkali co-precipitation method, and alkali-free methods [3].…”