Influence of trace elements on the textural properties of synthetic chrysotile: Complementary insights from macroscopic and nanoscopic measurements

Details

Serval ID
serval:BIB_33DFBF8F8530
Type
Article: article from journal or magazin.
Collection
Publications
Title
Influence of trace elements on the textural properties of synthetic chrysotile: Complementary insights from macroscopic and nanoscopic measurements
Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Author(s)
Lafay Romain, Montes-Hernandez German, Janots Emilie, Auzende Anne-Line, Chiriac Rodica, Lemarchand Damien, Toche Francois
ISSN-L
1387-1811
Publication state
Published
Issued date
01/2014
Volume
183
Pages
81-90
Notes
ISI:000327284900012
Abstract
The present study shows that the presence of Li, Sb, As and B as trace
elements significantly influences textural properties such as particle
size distribution, morphology and specific surface area of chrysotile
synthesized under hydrothermal conditions (P = 8.2 MPa, T = 300 degrees
C and high-alkaline pH (13.5)). Conversely, traces of Cs did not have
any textural effect under these conditions. Furthermore, chrysotile
nanotubes size and morphology depend strongly on the element considered.
Indeed, large chrysotile with cylinder in cylinder morphology (outer
diameter up to 50 nm) precipitated in the presence of Li, Sb and As.
This implies lower specific surface area (124-160 m(2) g(-1)) compared
to undoped chrysotile (184 m(2) g(-1) with about 14 nm in width). The
presence of boron favors the precipitation of thin fibrous nanotubes
similar to undoped chrysotile in width, but significantly longer, with
tubes length that can reach three microns in length. In this case, the
specific surface area increase slightly from 184 to 196 m(2)/g. The
solid-liquid partition coefficient for each investigated trace element
was determined using Langmuir equation. This well-tubular geo-material
can be used as a model to better understand the effects of trace
elements on the precipitation of minerals that are relevant in Earth
systems (e.g., serpentinization processes) and societal applications
(e.g., asbestos toxicity and CO2 sequestration). (C) 2013 Elsevier Inc.
All rights reserved.
Keywords
Chrysotile, Trace element, Sequestration, Textural properties, Nanotubes
Create date
08/09/2014 11:49
Last modification date
20/08/2019 13:20
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