The sepiolite membrane for ultrafiltration

Wang, Q.K.; Matsuura, Takeshi; Feng, Changyou; Weir, Mark R.; Detellier, Christian; Rutadinka, E.; Mao, R. Le Van

doi:10.1016/s0376-7388(00)00605-0

Cited by 35 publications

(24 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Inorganic materials exhibit usually high thermal and chemical stability. Their mechanical and structural properties give them a real potential for applications in separation processes [7][8][9][10][11]. However, these materials suffer from low processibility and higher costs than organic polymeric membranes.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous polymer – Clay hybrid membranes for gas separation

Defontaine

Barichard

Letaı̈ef

et al. 2010

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Nanoporous polymer – Clay hybrid membranes for gas separation

Defontaine

Barichard

Letaı̈ef

et al. 2010

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…OH groups on the external surface originate as a result of broken Si O Si bonds, balancing their residual charge by accepting a proton to form Si OH groups which can react with several molecules by formation of different bonding. Due to its unique structure and specific physico-chemical properties, sepiolite is used as an adsorbent, decolorizing agent, catalyst or catalyst carrier [1,6,7] and as an inorganic membrane for ultra-filtration [8]. Furthermore sepiolite, together with palygorskite (a modulated layer silicate where tunnels measure of 3.7 × 6.0 Å 2 in cross section) and indigo (C 16 H 10 N 2 O 2 ), forms the famous Maya Blue pigment, well known in Cultural Heritage for its outstanding stability [9][10][11].…”

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

View full text Add to dashboard Cite

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.

show abstract

“…Due to its sorptive, rheological and catalytic properties, sepiolite is widely used in a variety of industrial applications. Sepiolite is used as a catalyst and catalyst support, 10 a filler in polymer composites, 11 a membrane for ultrafiltration 12 and as molecular sieves. 13 Sepiolite is an effective and economical sorbent material, a bleaching and clarifying agent, a filter aid, an industrial sorbent and the spectrum of its utilization ranges from cosmetics to paints and fertilizers.…”

Section: Introductionmentioning

confidence: 99%

Sorption of Cu2+ and Co2+ ions from aqueous solutions onto sepiolite: An equilibrium, kinetic and thermodynamic study

Lazarević¹,

Janković-Čaštvan²,

Radovanović³

et al. 2011

JSCS

View full text Add to dashboard Cite

The efficiency of natural sepiolite for the removal of Cu 2+ and Co 2+ from aqueous solution was determined using the batch method. The sorption experiments were performed as a function of the initial metal concentration, the equilibration time and temperature. Thermodynamic parameters, such as enthalpy, free energy and entropy, were calculated from the temperature dependent sorption isotherms and these values showed that the sorption of the investigated metals onto sepiolite was endothermic. The pseudo-second order kinetic model provides the best correlation of the experimental kinetic data.

show abstract

The sepiolite membrane for ultrafiltration

Cited by 35 publications

References 15 publications

Nanoporous polymer – Clay hybrid membranes for gas separation

Nanoporous polymer – Clay hybrid membranes for gas separation

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

Sorption of Cu2+ and Co2+ ions from aqueous solutions onto sepiolite: An equilibrium, kinetic and thermodynamic study

Contact Info

Product

Resources

About