Understanding the formation of Al13 and Al30 polycations to the development of microporous materials based on Al13-and Al30-PILC montmorillonites: a review

Cardona, Yaneth; Korili, S.A.; Gil, A.

doi:10.1016/j.clay.2021.105996

Cited by 32 publications

(12 citation statements)

References 132 publications

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“…The chemical analysis indicated that the ratios of Al mmol/clay g were lower compared with the starting ratio of 6. Similar data were reported for other clay minerals using a same aluminum pillaring solution [50][51][52]. In the case of Zr-Mt, the Ca cations were also exchanged with Zr species, as a significant decrease in its contents was observed.…”

Section: Xrf Datasupporting

confidence: 84%

Al and Zr Porous Clay Heterostructures as Removal Agents of Basic Blue-41 Dye from an Artificially Polluted Solution: Regeneration Properties and Batch Design

et al. 2021

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The removal of Basic Blue-41 dye molecules was carried out by using two doped porous clay heterostructures by aluminum (Al) or zirconium (Zr) species. The proposed method of synthesis showed its efficiency, starting from Al or Zr intercalated hydrolyzed species, prior to its reaction with dodecylamine (C12 amine) and tetraethyl orthosilicate (TEOS) as a silica source. The intercalated precursors and their porous clay heterostructures (PCH) derivatives were characterized by different techniques. Solid NMR technique proved the presence of Al species into the intercalated silica between the clay sheets, and in addition to Si in different environments within the PCH materials. The Zr-PCH material exhibited a higher surface area and pore volume compared to its Al-PCH counterpart, with a mesoporous character for both materials. A maximum removed amount of 279 and 332 mg/g was achieved and deduced from the Langmuir equation. The regeneration tests revealed that the removal efficiency of Zr-PCH was retained after five regeneration runs, with a loss of 15% of the original value; meanwhile, the Al-PCH lost 45% of its efficiency after only three cycles. A single-stage batch design was proposed based on the Langmuir isotherm parameters. The increase of the removal capacity of Zr-PCH led to the reduction of the required amounts for the target removal of BB-41 dye compared to Al-PCH.

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Section: Xrf Datasupporting

confidence: 84%

Al and Zr Porous Clay Heterostructures as Removal Agents of Basic Blue-41 Dye from an Artificially Polluted Solution: Regeneration Properties and Batch Design

et al. 2021

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“…The treatment consists of the exchange of the interlayer alkaline or alkaline earth cations [2,73] [74]. Parameters such as the [OH]:[Al 3+ ] ratio, the [Al 3+ ] to clay mineral proportion and the aging temperature have a marked influence on the materials' stability and efficiency [75]. Not only Al 3+ has been employed in the pillarization, but also other cations, such as Fe 3+ [2,17,72,74,[76][77][78][79][80], Ti 4+ [76,81,82], Zr 4+ [73,83], Co 2+ , Ni 2+ and Cu 2+ [84], and Cu 2+ [85].…”

Section: Intercalated and Pillared Clay Mineralsmentioning

confidence: 99%

“…These works describe the preparation, characterization, and applications for the adsorption or degradation of different organic compounds since they can support catalysts for photodegradation. Excellent reviews addressed the theory and the preparation procedures [68,75] as well as the removal of organic pollutants from wastewater [68]. The intercalation and pillarization processes produced adsorbent materials for different organic pollutants [2,70,73,[85][86][87][88][89] and catalysts or photocatalysts for pollutants degradation/mineralization [69,72,74,82,90].…”

Section: Intercalated and Pillared Clay Mineralsmentioning

confidence: 99%

Guidelines to Study the Adsorption of Pesticides onto Clay Minerals Aiming at a Straightforward Evaluation of Their Removal Performance

Masini

Abate

2021

Minerals

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Natural and modified clay minerals have been extensively used for the adsorption/desorption of organic substances, especially pesticides, from waters and wastewater, aiming at pollution control and more efficient use of the herbicides through controlled release. While natural clay minerals efficiently remove organic cations such as paraquat and diquat, the adsorption of anionic or neutral species demands surface chemical modification with, for instance, quaternary ammonium salts containing long alkyl chains. Basic pesticides, on the other hand, are better absorbed in clay minerals modified with polycations. Kinetic studies and adsorption/desorption isotherms provide the parameters needed to evaluate the clay mineral’s adsorptive performance towards the pollutant target. However, the direct comparison of these parameters is complicated because the experimental conditions, the analytical techniques, the kinetic and isotherm models, and the numerical fitting method differ among the various studies. The free-energy-related Langmuir constant depends on the degree of site occupation; that is, it depends on the concentration window used to construct the adsorption isotherm and, consequently, on the analytical technique used to quantify the free concentrations. This paper reviews pesticides’ adsorption on natural and modified clay minerals and proposes guidelines for designing batch adsorption/desorption studies to obtain easily comparable and meaningful adsorption parameters. Articles should clearly describe the experimental conditions such as temperature, contact time, total concentration window, the solution to adsorbent ratio, the analytical technique, and its detection and quantification limits, besides the fitting models. Research should also evaluate the competitive effects of humic substances, colloidal inorganic particles, and ionic strength to emulate real-world adsorption experiments.

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“…However, due to the inorganic nature of bentonite, it is not compatible with organic media and, hence, requires being organo-modified [ 7 , 8 , 9 , 10 ]. Many different methods, including ion exchange [ 11 , 12 ], grafting of organic compounds [ 13 , 14 ], acid–base reactions [ 15 ], pillaring by different types of polycations [ 16 , 17 ], ion-dipole interaction [ 11 , 18 ], etc., were applied to modify the bentonite minerals. Among these, the conventional wet cation exchange technique has been commercialized and widely used for the synthesis of organo-montmorillonite (OMMT).…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Synthesis of Rosin-Modified Montmorillonite: A Breakthrough Approach to the Next Generation of OMMT/Rubber Nanocomposites

2021

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The current investigation presents a green mechanochemical procedure for the synthesis of a special kind of rubber-compatible organo-montmorillonite (OMMT) for use in the inner liner compound of tires. The compatibility character of the OMMT arises from the mechanochemical reaction of the raw bentonite mineral and gum rosin as some of the organic constituents of the inner liner composition. The monitoring of OMMT synthesis by various characterization techniques reveals that gum rosin gradually intercalates into the montmorillonite (MMT) galleries during milling and increases the interlayer spacing to 41.1 ± 0.5 Å. The findings confirm the simultaneous formation of single- or few-layered OMMT platelets with average sizes from the sub-micron range up to several micrometers during the milling process. The mechanical properties of the OMMT/rubber nanocomposite, such as tensile strength, tear resistance and elongation, present a good enhancement in comparison to the un-modified material. Moreover, the organo-modification of the inner liner composition also leads to a property improvement of about 50%.

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Understanding the formation of Al13 and Al30 polycations to the development of microporous materials based on Al13-and Al30-PILC montmorillonites: a review

Cited by 32 publications

References 132 publications

Al and Zr Porous Clay Heterostructures as Removal Agents of Basic Blue-41 Dye from an Artificially Polluted Solution: Regeneration Properties and Batch Design

Al and Zr Porous Clay Heterostructures as Removal Agents of Basic Blue-41 Dye from an Artificially Polluted Solution: Regeneration Properties and Batch Design

Guidelines to Study the Adsorption of Pesticides onto Clay Minerals Aiming at a Straightforward Evaluation of Their Removal Performance

Mechanochemical Synthesis of Rosin-Modified Montmorillonite: A Breakthrough Approach to the Next Generation of OMMT/Rubber Nanocomposites

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