From natural attapulgite to mesoporous materials: methodology, characterization and structural evolution

The Journal of Physical Chemistry. B
Huaming YangStephen Mann

Abstract

In this paper, we report the synthesis of hexagonally ordered aluminum-containing mesoporous silica, Al-MCM-41, from natural attapulgite (Al-substituted Si(8)O(20)Mg(5)(OH)(2)(H(2)O)(4) x 4 H(2)O) without addition of silica or aluminum reagents. A pretreatment process involving sequential mechanical grinding and acid leaching is critical to the successful use of attapulgite as a source of both Si and Al in the surfactant-templated hydrothermal synthesis of Al-MCM-41. The resulting mesophase had a surface area of 1030 m(2)/g and an average pore diameter of 3.7 nm with narrow pore size distribution. The influence of changes in processing parameters, such as grinding time, hydrothermal conditions, and calcination temperature, on the textural characteristics of the Al-MCM-41 products is studied. Investigations of the mechanism of structural evolution indicate that grinding of attapulgite results in amorphization and partial structural breakdown, transformation of the fibrous mineral bundles into rod-shaped particles, and partial displacement of octahedrally coordinated Al(3+) ions into the Si-O tetrahedral framework. Subsequent acid etching dissolves the Mg-rich octahedral sheets to produce samples with variable texture due to modi...Continue Reading

References

Jun 16, 2007·Journal of Colloid and Interface Science·Kiyoshi OkadaChengala D Madhusoodana
Feb 10, 1995·Science·P T Tanev, T J Pinnavaia
Feb 7, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·C BisioS Coluccia
Apr 2, 2010·ACS Applied Materials & Interfaces·Enrica GianottiSalvatore Coluccia

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Citations

Jun 18, 2016·ACS Applied Materials & Interfaces·Mengya NiuAidong Tang
Feb 15, 2013·Chemical Society Reviews·Corine GérardinBénédicte Lebeau
Dec 29, 2020·Journal of Hazardous Materials·Yangyu LiuZaher Hashisho

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