Microwave assisted acid treatment of sepiolite: The role of composition and “crystallinity”
Source abstract
Abstract
Abstract Three sepiolites with differences in composition and structural ordering were treated with 0.2 N HCl and 0.2 N HNO 3 solutions assisted with microwave radiation. This treatment caused in the firsts 16 min the progressive Mg 2 + depletion of the octahedral sheet, the gradual degradation of the sepiolite structure and the formation of an amorphous silica phase which contributes to a noticeable increase of the BET specific surface area. The assistance of microwaves during the acid treatment allows us to get specific surface areas equivalent to those obtained after 48 h with conventional heating methods. The influence of mineralogical impurities, “crystallinity” and chemical composition on the reactivity of sepiolite were also studied.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Clay minerals and soil interactions · Chemical Synthesis and Characterization · Crystal Structures and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (45)
Show source-provided references
1. FT-IR and FT-Raman spectral investigations of Anatolian attapulgite and its interaction with 4,4′-bipyridyl10.1016/0022-2860(95)08709-5 ↗
2. Sepiolite as a feasible soil additive for the immobilization of cadmium and zinc10.1016/S0048-9697(02)00468-0 ↗
3. Silica from sepiolite: preparation, textural properties, and use as support to catalyst10.1016/0927-6513(95)00096-8 ↗
4. Thermal decomposition of sepiolite and variations in pore structure with and without acid pre-treatment10.1002/(SICI)1097-4660(199605)66:1<72::AID-JCTB442>3.0.CO;2-T ↗
5. Synthesis and characterization of bentonites rich in beidellite with incorporated Al or Al–Fe oxide pillars10.1016/j.micromeso.2012.08.029 ↗
6. Determination of pore volume and area distributions in porous substances. I. Computations from nitrogen isotherms
7. Struktur und Entstehung des Sepioliths10.1007/BF01128033 ↗
8. Sepiolite and industrial waste water purification: removal of Zn2+ and Pb2+ from aqueous solutions10.1016/0169-1317(96)00007-5 ↗
9. Kinetics of heavy-metal removal and recovery in sepiolite10.1016/S0169-1317(99)00046-0 ↗
10. Adsorption of gases in multimolecular layers
11. Etude cinetique de l'attaque acide de la sepiolite: modifications des proprietes texturales10.1180/claymin.1986.021.1.06 ↗
12. Influence of the procedure of nickel deposition on the textural and catalytic properties of nickel/sepiolite catalysts10.1021/ie00083a014 ↗
13. The structure of acid treated sepiolites: small-angle X-ray scattering and multi MAS-NMR investigations10.1016/S0169-1317(98)00056-8 ↗
14. The layer silicates
15. ‘Rocky Mountain leather’, sepiolite and attapulgite-an infrared emission spectroscopic study10.1016/S0924-2031(98)00014-9 ↗
16. Near-infrared and mid-infrared spectroscopic study of sepiolites and palygorskites10.1016/S0924-2031(01)00110-2 ↗
17. Palygorskite and sepiolite deposits in continental environments. Description, genetic patterns and sedimentary settings
18. On the chemical composition of sepiolite and palygorskite10.1346/CCMN.2010.0580101 ↗
19. Adsorption of chloridazon from aqueous solution on heat and acid treated sepiolites10.1016/j.watres.2005.03.001 ↗
20. Modulated 2:1 layer silicates: review, systematics, and predictions
21. Crystal chemistry, classification, and identification of modulated layer silicates
22. The structures and microtextures of the palygorskite–sepiolite group
23. Purification of Turkish sepiolite through hydrochloric acid treatment10.1016/0169-1317(94)90012-4 ↗
24. Evolution of surface area in a sepiolite as a function of acid and heat treatments10.1180/claymin.1978.013.4.03 ↗
25. Adsorption of cobalt from aqueous solutions onto sepiolite10.1016/S0043-1354(02)00265-8 ↗
26. Acid activation of clay minerals
27. Characterization of smectite after acid activation with microwave irradiation10.1016/j.clay.2008.04.014 ↗
28. Studies on pore systems in catalysts: V. The t method10.1016/0021-9517(65)90307-6 ↗
29. Comparative FT-IR study of structural modifications during acid treatment of dioctahedral smectites and hectorite10.1016/S1386-1425(98)00040-7 ↗
30. Structural and textural modifications of palygorskite and sepiolite under acid treatment10.1346/CCMN.1998.0460301 ↗
31. The interaction of vanadia with sepiolite. Structural studies by 51V solid-state NMR and Raman spectroscopy10.1016/0021-9517(92)90137-7 ↗
32. Genetic constraints on crystallinity, thermal behaviour and surface area of sepiolite from the Cerro de los Batallones deposit (Madrid Basin, Spain)10.1016/j.clay.2014.02.005 ↗
33. Advanced materials and new applications of sepiolite and palygorskite
34. Adsorption mechanism of canonic surfactants onto acid and heat-activated sepiolites10.1016/S0043-1354(02)00110-0 ↗
35. Variability in sepiolite: diffraction studies10.2138/am.2011.3761 ↗
36. Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Recommendations 1984)10.1351/pac198557040603 ↗
37. Advances in the crystal chemistry of sepiolite and palygorskite
38. Variability of the surface properties of sepiolite10.1016/j.clay.2012.06.003 ↗
39. Variation of some engineering properties of clays with heat treatment10.1016/j.matlet.2003.08.030 ↗
40. Characterization of surface acidity of ana acid montmorillonite activated with hydrothermal, ultrasonic and microwave techniques10.1016/j.clay.2005.07.001 ↗
41. Novel anhydrous unfolded structure by heating of acid pre-treated sepiolite10.1016/j.clay.2006.10.005 ↗
42. Van Der Marel · 1976
43. Acid activation of a Spanish sepiolite: physicochemical characterization, free silica content and surface area of products obtained10.1180/claymin.1994.029.3.07 ↗
44. Ni nanoparticles supported on microwave-synthesised hectorite for the hydrogenation of styrene oxide10.1016/j.apcata.2011.09.002 ↗
45. Acid–base behaviour and Cu2+ and Zn2+ complexation properties of the sepiolite/water interface10.1016/S0009-2541(03)00002-0 ↗