H2xMnxSn3-xS6 (x=0.11-0.25): A Novel Reusable Sorbent for Highly Specific Mercury Capture Under Extreme pH Conditions

 
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2009 (EN)
H2xMnxSn3-xS6 (x=0.11-0.25): A Novel Reusable Sorbent for Highly Specific Mercury Capture Under Extreme pH Conditions (EN)

Manos, M. J. (EN)

Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας (EL)
Manos, M. J. (EN)

The H2xMnxSn3-xS6 (x = 0.11-0.25) is a new solid acid with a layered hydrogen metal sulfide (LHMS). It derives from K2xMnxSn3-xS6 (x = 0.5-0.95) (KMS-1) upon treating it with highly acidic solutions. We demonstrate that LHIMS-1 has enormous affinity for the very soft metal ions such as Hg2+ and Ag+ which occurs via a rapid ion exchange process. The tremendous affinity of LHMS-1 for Hg2+ is reflected in very high distribution coefficient K-d(Hg) values (>10(6) mL g(-1)). The large affinity and selectivity of LHMS-1 for Hg2+ persists in a very wide pH range (from less than zero to nine) and even in the presence of highly concentrated HCI and HNO3 acids. LHMS-1 is significantly more selective for Hg2+ and Ag+ than for the less soft cations Pb2+ and Cd2+. The Hg2+ ions are immobilized in octahedral sites between the sulfide layers of the materials via Hg-S bonds as suggested by pair distribution function (PDF) analysis. LHMS-1 could decrease concentrations of Hg2+ (e.g. <100 ppb) to well below the acceptable limits for the drinking water in less than two min. Hg-laden LHIMS-1 shows a remarkable hydrothermal stability and resistance in 6 M HCl solutions. LHMS-1 could be regenerated by treating Hg-loaded samples and re-used without loss of its initial exchange capacity. (EN)

organo-ceramic adsorbent (EN)

Πανεπιστήμιο Ιωαννίνων (EL)
University of Ioannina (EN)

Advanced Functional Materials (EN)

English

2009

<Go to ISI>://000265394900013

Wiley-VCH Verlag (EN)



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