Purification and defibering of a Chinese sepiolite

Zhou, Feng; Yan, Chunjie; Zhang, Yan; Tan, Jianjie; Wang, Hongquan; Zhou, Sen; Song, P.

doi:10.1016/j.clay.2016.02.013

Cited by 64 publications

(21 citation statements)

References 33 publications

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“…In Table 1, 11.16% of the measured Mg 2+ content of raw Sep, which is lower than the theoretical content (e.g. hydrothermal environment [45,46], which is also evidently confirmed by TEM measurement. The heavy agglomeration of raw Sep particles as shown in Fig.…”

Section: Acid Activationsupporting

confidence: 56%

“…1A) is expected to form additional proton paths. In step 1, the enlarged internal and external surface area was achieved via acid activation treatment with effects of defibration and magnesium removal [44][45][46] (Fig. 1B).…”

Section: Pamentioning

confidence: 99%

“…With the exception of evidence for the removal of a large amount of Mg 2+ in combination with K + , Na + , Ca 2+ , and other impurities in Sep particles, the changes of specific surface area and the pore volume of the micro-pores by acid treatment can be efficiently detected through BET test [45,52]. As shown in Fig.…”

Section: Acid Activationmentioning

confidence: 99%

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Poly(2,5-benzimidazole)/sulfonated sepiolite composite membranes with low phosphoric acid doping levels for PEMFC applications in a wide temperature range

Zhang

Liu

Xia

et al. 2019

Journal of Membrane Science

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To broaden the operating temperature range of phosphoric acid (PA) doped polybenzimidazole membrane-based proton exchange membrane fuel cells (PEMFCs) toward low temperatures, a novel series of poly(2,5-benzimidazole) (ABPBI)/sulfonated sepiolite (S-Sep) composite membranes (ABPBI/S-Sep) with low PA doping levels (DLs) were prepared via in-situ synthesis. The desirably enhanced mechanical, thermal, and oxidative stabilities of ABPBI/S-Sep composite membranes were achieved by constructing ABPBI chains arranged along the sepiolite (Sep) fibers 2 and acid-base crosslinks formed between S-Sep fibrous particles and ABPBI chains. Benefiting from the richness of high temperature stable bound water and the excellent water absorbability of Sep particles that enable the formation of additive proton conducting paths, the composite membranes retained bounded PA and achieved much higher proton conductivities under both anhydrous and hydrous conditions compared to PA-doped ABPBI membranes. Proton conductivity values above 0.01 S/cm at 40-90 °C/20-98% RH conditions and 90-180 °C/anhydrous conditions as well as peak power density of 0.13 and 0.23 W/cm 2 at 80 and 180 °C with 0% RH, respectively from the ABPBI/2S-Sep composite membrane are more holistic compared to Nafion at low temperatures and polybenzimidazole-based membranes at high temperatures, respectively. The excellent properties of ABPBI/S-Sep composite membranes suggest them as prospective candidates for PEMFCs applications in a wide temperature range.

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Section: Acid Activationsupporting

confidence: 56%

Section: Pamentioning

confidence: 99%

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Poly(2,5-benzimidazole)/sulfonated sepiolite composite membranes with low phosphoric acid doping levels for PEMFC applications in a wide temperature range

Zhang

Liu

Xia

et al. 2019

Journal of Membrane Science

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“…[15][16][17][18] Sepiolite mineral nanobers have good adsorptive and ion exchange performance, which could be utilized to remove toxic pollutants, opposite charge ions, and complexes. However, natural sepiolite usually occurs as aggregates bundles in nature due to the special minerogenetic condition, [19][20][21] which restricts considerably the adsorption capacity. Therefore, it is necessary to disperse sepiolite aggregates into individual bers by micro-regulation of the structure.…”

Section: Introductionmentioning

confidence: 99%

A facile fabrication of sepiolite mineral nanofibers with excellent adsorption performance for Cd²⁺ ions

et al. 2019

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“…Each block is connected to its neighbour through an inverted Si O Si bond. Tunnels measure approximately 3.7 × 10.6 Å 2 in cross section and account in large part for the high specific surface area and excellent sorption properties related to several active sites, i.e., i) OH-anions coordinated to Mg octahedral sites; ii) structural H 2 O which completes the Mg octahedral site coordination at the edge of the tunnels; iii) four zeolitic H 2 O positions inside sepiolite tunnels [4,5] (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Structural properties of adsorbent phyllosilicates rule the entrapping ability of intercalated iron-phenanthroline complex towards thiols

Castellini

Malferrari

Bernini

et al. 2019

Microporous and Mesoporous Materials

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The interaction of volatile organic sulfur derivatives, such as 1-heptanethiol (C 7 H 16 S), with clay minerals treated with a μ-oxo Fe 3+-phenanthroline 1:1 complex results strongly affected by crystal chemical properties of pristine mineral phases. In particular, two sepiolite clays with different structural features demonstrated significantly different ability to immobilize the Fe 3+-phenanthroline complex at two pH values (pH = 5.4 and pH = 2.3). The most effective binding was obtained with sepiolite with higher structural disorder at pH 5.4. Accordingly, the resulting hybrid material showed also the greatest efficiency in removal of thiol in gas phase. A direct correlation can be established between the adsorption of the Fe 3+-phenanthroline complex and the gas binding process at room temperature. In fact, 1-heptanethiol entrapping occurs via redox reactions between Fe 3+ and a first thiol molecule to give the reduced Fe 2+-phenanthroline complex and disulfide, followed by the binding of further thiols to the reduced metal centre. The extremely high amount of thiol immobilized by the hybrid material also suggests the co-presence of a catalytic mechanism that guarantees the reoxidation of Fe +2 to Fe +3 and the restoration of redox reactions with thiol. Investigation and conclusions were supported by the several experimental techniques: elemental analysis, X-ray powder diffraction analyses, UV-Vis measurements, FT-IR and NMR spectroscopies, thermogravimetric analyses.

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Purification and defibering of a Chinese sepiolite

Cited by 64 publications

References 33 publications

Poly(2,5-benzimidazole)/sulfonated sepiolite composite membranes with low phosphoric acid doping levels for PEMFC applications in a wide temperature range

Poly(2,5-benzimidazole)/sulfonated sepiolite composite membranes with low phosphoric acid doping levels for PEMFC applications in a wide temperature range

A facile fabrication of sepiolite mineral nanofibers with excellent adsorption performance for Cd²⁺ ions

Structural properties of adsorbent phyllosilicates rule the entrapping ability of intercalated iron-phenanthroline complex towards thiols

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Purification and defibering of a Chinese sepiolite

Cited by 64 publications

References 33 publications

Poly(2,5-benzimidazole)/sulfonated sepiolite composite membranes with low phosphoric acid doping levels for PEMFC applications in a wide temperature range

Poly(2,5-benzimidazole)/sulfonated sepiolite composite membranes with low phosphoric acid doping levels for PEMFC applications in a wide temperature range

A facile fabrication of sepiolite mineral nanofibers with excellent adsorption performance for Cd2+ ions

Structural properties of adsorbent phyllosilicates rule the entrapping ability of intercalated iron-phenanthroline complex towards thiols

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Product

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A facile fabrication of sepiolite mineral nanofibers with excellent adsorption performance for Cd²⁺ ions