Stability of hydrotalcite (Mg-Al layered double hydroxide) in presence of different anions

Bernard, Ellina; Zucha, Wolfgang Jan; Lothenbach, Barbara; Mäder, Urs

doi:10.1016/j.cemconres.2021.106674

Cited by 93 publications

(82 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…73 Yet, this phase remained amorphous to electron diffraction, but hydrotalcite is often observed to be poorly crystalline in cement environments. 74 This observation highlights the possibility of secondary phase precipitation within the surface layer pores.…”

Section: Surface Layer Formationmentioning

confidence: 82%

Titanium in GGBS-like calcium-magnesium-aluminosilicate glasses: Its role in the glass network, dissolution at alkaline pH and surface layer formation

Blotevogel

Poirier

Vantelon

et al. 2022

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

Section: Surface Layer Formationmentioning

confidence: 82%

Titanium in GGBS-like calcium-magnesium-aluminosilicate glasses: Its role in the glass network, dissolution at alkaline pH and surface layer formation

Blotevogel

Poirier

Vantelon

et al. 2022

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

“…The peak shown at 1496 cm −1 is characteristic of the azo bond [ 60 ]. Other peaks are observed in Samples 4 and 9 at 1600 and 1630 cm −1 , respectively, which correspond to the aromatic groups -C=C- [ 55 , 56 , 57 , 58 ], in the colorant the peak is at 1618 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

“…At this point, it is worth noting that hydrotalcite has a crystalline structure [ 55 , 56 ] and colorants an amorphous form. The peak of the XRD is higher when more crystalline structures are present, but this structure is totally lost when the H is calcined to form HC;it is recovered to a large extent when it is hydrated again.…”

Section: Resultsmentioning

confidence: 99%

“…In the case of Direct Blue 199 ( Figure 13 ) and Direct Blue 71 ( Figure 14 ), the peak at 1100 cm −1 is attributed to acetates, formates, propionates, and benzoates [ 59 ]. Previous work has indicated that the peaks between 1400 and 1640 cm −1 [ 55 , 56 , 57 , 58 ] correspond to benzene rings and that the peak shown at 1500 cm −1 is characteristic of the azo bond [ 60 ] which in Sample 12 can be seen smoothly shifted to 1520 cm −1 . Another peak can be found at 1035 cm −1 which corresponds to the symmetric sulfonate vibration [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The Optimal Concentration of Nanoclay Hydrotalcite for Recovery of Reactive and Direct Textile Colorants

López-Rodríguez

Micó-Vicent

Bonet-Aracil

et al. 2022

IJMS

View full text Add to dashboard Cite

Concerns about the health of the planet have grown dramatically, and the dyeing sector of the textile industry is one of the most polluting of all industries. Nanoclays can clean dyeing wastewater using their adsorption capacities. In this study, as a new finding, it was possible to analyze and quantify the amount of metal ions substituted by anionic dyes when adsorbed, and to determine the optimal amount of nanoclay to be used to adsorb all the dye. The tests demonstrated the specific amount of nanoclay that must be used and how to optimize the subsequent processes of separation and processing of the nanoclay. Hydrotalcite was used as the adsorbent material. Direct dyes were used in this research. X-ray diffraction (XRD) patterns allowed the shape recovery of the hydrotalcite to be checked and confirmed the adsorption of the dyes. An FTIR analysis was used to check the presence of characteristic groups of the dyes in the resulting hybrids. The thermogravimetric (TGA) tests corroborated the dye adsorption and the thermal fastness improvement. Total solar reflectance (TSR) showed increased radiation protection for UV-VIS-NIR. Through the work carried out, it has been possible to establish the maximum adsorption point of hydrotalcite.

show abstract

“…In this letter, the thermodynamic modelling was carried out using the Gibbs free energy minimization program GEMSelektor [76] combined with the GEMS-PSI thermodynamic database [77] and the cemdata2018 database [78]. These databases were completed with thermodynamic data from [40,46,62] to describe the Ca and Al uptake in M-S-H: (C-)M-(A)S-H, the uptake of different anions in hydrotalcite from [79], the possible formation of (hydrated) magnesium carbonates [45] and Mg-phosphates phases and complexes from [80]. The modelling were used to predict the stability domains of M-S-H and M-A-S-H in the absence and presence of carbonates.…”

Section: Thermodynamic Databasesmentioning

confidence: 99%

Research progress on magnesium silicate hydrate phases and future opportunities

Bernard

2022

RILEM Tech Lett

Self Cite

View full text Add to dashboard Cite

This short letter summaries the latest research on the structure and thermodynamic modelling of the magnesium silicate hydrates (M-S-H) phases. M-S-H structure is comparable to hydrated clays, with a smaller and rounder microstructures compared to clay platelets. Similar to clay minerals, M-S-H can incorporate ions such as aluminium and hydrated exchangeable cations to compensate the negative surface charge. This fundamental understanding of M-S-H structure allowed to develop structure-based thermodynamic models, which can further help to optimise the conditions for M-S-H formation and its use as cementitious materials. Optimized binders containing M-S-H have the advantages of presenting: i) good mechanical properties, ii) dense microstructure and potentially good resistances to leaching and iii) low pH values. These types of binders could therefore be used for cement products with non-steel reinforcement, for the encapsulation of specific wastes, for products containing natural fibres or for the clay stabilisation, etc.

show abstract

Stability of hydrotalcite (Mg-Al layered double hydroxide) in presence of different anions

Cited by 93 publications

References 52 publications

Titanium in GGBS-like calcium-magnesium-aluminosilicate glasses: Its role in the glass network, dissolution at alkaline pH and surface layer formation

Titanium in GGBS-like calcium-magnesium-aluminosilicate glasses: Its role in the glass network, dissolution at alkaline pH and surface layer formation

The Optimal Concentration of Nanoclay Hydrotalcite for Recovery of Reactive and Direct Textile Colorants

Research progress on magnesium silicate hydrate phases and future opportunities

Contact Info

Product

Resources

About