Evaluation of boron removal from water by hydrotalcite-like compounds

Ferreira, Odair P.; Moraes, Sandra Gomes de; Durán, Nélson; Cornejo, Lorena; Alves, Oswaldo Luiz

doi:10.1016/j.chemosphere.2005.04.009

Cited by 166 publications

(85 citation statements)

References 38 publications

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“…Boron sorption was independent of pH and maximum boron uptake did not change significantly when the pH was adjusted using sodium hydroxide or nitric acid. This pH independence of boron uptake was attributed to the high buffering capacity of the LDH [53]. A maximum boron sorption capacity of 92% occurred at an adsorbent dose of 2.5 g/L.…”

Section: Mg/al Hydrotalcite Like Ldhs For the Removal Of Boron From Smentioning

confidence: 96%

“…Ferreira et al [53] reported on the removal of boric acid/borate from water using Mg/Al and Mg/Fe LDHs prepared by laboratory scale co-precipitation at variable pH. Chemical analysis confirmed that the Mg:Al ratio of the material was 2.1 and powder X-ray diffraction (XRD)…”

Section: Mg/al Hydrotalcite Like Ldhs For the Removal Of Boron From Smentioning

confidence: 99%

“…The data showed a good fit for the Langmuir adsorption isotherm model with a correlation coefficient (r 2 ) value of 0.999 indicating that boron sorption was a monolayer process. Ferreira et al calculated the maximum boron removal capacity of 14.0mg/g using the Langmuir model [53].…”

Section: Mg/al Hydrotalcite Like Ldhs For the Removal Of Boron From Smentioning

confidence: 99%

“…Ferreira et al [53] compared the boron uptake capacity of a Mg/Al LDH with that of a Mg/Fe LDH ( Table 1). A Mg/Fe LDH with a molar ratio of 2:1 was prepared by a co-precipitation using a method similar to the one previously described for the Mg/Al LDH [53].…”

Section: Mg/fe Type Ldhs For the Removal Of Boron From Watermentioning

confidence: 99%

“…A Mg/Fe LDH with a molar ratio of 2:1 was prepared by a co-precipitation using a method similar to the one previously described for the Mg/Al LDH [53]. Boron uptake by the Mg/Fe LDH was significantly lower than that of the Mg/Al LDH in all cases.…”

Section: Mg/fe Type Ldhs For the Removal Of Boron From Watermentioning

confidence: 99%

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Removal of boron species by layered double hydroxides: A review

Theiss

Ayoko

Frost

2013

Journal of Colloid and Interface Science

116

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Boron, which is an essential element for plants, is toxic to humans and animals at high concentrations. Layered double hydroxides (LDHs) and thermally activated LDHs have shown good uptake of a range of boron species in laboratory scale experiments when compared to current available methods, which are for the most part ineffective or prohibitively expensive. LDHs were able to remove anions from water by anion exchange, the reformation (or memory) effect and direct precipitation. The main mechanism of boron uptake appeared to be anion exchange, which was confirmed by powder X-ray diffraction (XRD) measurements. Solution pH appeared to have little effect on boron sorption while thermal activation did not always significantly improve boron uptake. In addition, perpetration of numerous LDHs with varying boron anions in the interlayer region by direct co-precipitation and anion exchange have been reported by a number of groups. The composition and orientation of the interlayer boron ions could be identified with reasonable certainty by applying a number of characterisation techniques including: powder XRD, nuclear magnetic resonance spectroscopy (NMR), X-ray photoelectron spectroscopy (XPS) and infrared (IR) spectroscopy. There is still considerable scope for future research on the application of LDHs for the removal of boron contaminants.

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Section: Mg/al Hydrotalcite Like Ldhs For the Removal Of Boron From Smentioning

confidence: 96%

Section: Mg/al Hydrotalcite Like Ldhs For the Removal Of Boron From Smentioning

confidence: 99%

Section: Mg/al Hydrotalcite Like Ldhs For the Removal Of Boron From Smentioning

confidence: 99%

Section: Mg/fe Type Ldhs For the Removal Of Boron From Watermentioning

confidence: 99%

Section: Mg/fe Type Ldhs For the Removal Of Boron From Watermentioning

confidence: 99%

See 3 more Smart Citations

Removal of boron species by layered double hydroxides: A review

Theiss

Ayoko

Frost

2013

Journal of Colloid and Interface Science

116

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Synthesis of chitosan beads as boron sorbents

Bursalı

Seki

Seyhan

et al. 2011

J of Applied Polymer Sci

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Parameters, such as pH, temperature, initial boron concentration, adsorbent dosage, and ionic strength, affecting boron adsorption onto chitosan beads were examined in this study. The following values were obtained as the optimum conditions in our studied ranges: pH 8.0, temperature ¼ 308 K, amount of chitosan beads ¼ 0.15 g, initial boron concentration ¼ 4 mg L À1, and ionic strength ¼ 0.1 M NaCl]. The adsorption kinetics were also examined in terms of three kinetic models: the pseudo-first-order, pseudo-second-order, and intraparticle diffusion models. The pseudosecond-order kinetic model showed very good agreement with the experimental data. Intraparticle plots seemed to have two steps and indicated multilinearity. Equilibrium data were evaluated with nonlinear and linear forms of the Langmuir and Freundlich equations. The experimental data conformed to the Freundlich equation on the basis of the formation of multilayer adsorption. To characterize the synthesized chitosan beads, we used Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) analyses. As shown by FTIR analysis, the boron species may have interacted with the NH 2 groups on chitosan. Microparticles of about 5 lm appeared in the SEM micrographs of the chitosan beads. V C 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122: [657][658][659][660][661][662][663][664][665] 2011

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Anion Selectivity of Layered Double Hydroxides: Effects of Crystallinity and Charge Density

Hibino

2018

Eur J Inorg Chem

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Layered double hydroxides (LDHs) have long been thought to have low selectivity for NO 3 -. In contrast, it has recently been reported that LDHs with certain compositions show high selectivity for NO 3 -. The reason for the high selectivity has been unclear, although the ion sieve effect has been proposed as a possible mechanism. Moreover, small LDHs have been reported to show good anion exchanging ability. Given this background, a systematic study was conducted using Mg-Al LDHs with two different crystallinities. High-crystallinity LDHs with lager particle sizes clearly showed selectivity changes that de-

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Evaluation of boron removal from water by hydrotalcite-like compounds

Cited by 166 publications

References 38 publications

Removal of boron species by layered double hydroxides: A review

Removal of boron species by layered double hydroxides: A review

Synthesis of chitosan beads as boron sorbents

Anion Selectivity of Layered Double Hydroxides: Effects of Crystallinity and Charge Density

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