<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">S. Chikkamath</style></author><author><style face="normal" font="default" size="100%">J. Manjanna</style></author><author><style face="normal" font="default" size="100%">N. Momin</style></author><author><style face="normal" font="default" size="100%">B.G. Hegde</style></author><author><style face="normal" font="default" size="100%">G.P. Nayaka</style></author><author><style face="normal" font="default" size="100%">Aishwarya S. Kar</style></author><author><style face="normal" font="default" size="100%">B.S. Tomar</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Na-montmorillonite to Fe(II)-Mt using ferrous citrate/ascorbate obtained by dissolving iron powder</style></title><secondary-title><style face="normal" font="default" size="100%">Applied Clay Science</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Ascorbic acid</style></keyword><keyword><style  face="normal" font="default" size="100%">Bentonite</style></keyword><keyword><style  face="normal" font="default" size="100%">Citric acid</style></keyword><keyword><style  face="normal" font="default" size="100%">Cr(VI) reduction</style></keyword><keyword><style  face="normal" font="default" size="100%">Fe(II)-montmorillonite</style></keyword><keyword><style  face="normal" font="default" size="100%">Iron dissolution</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2022</style></year><pub-dates><date><style  face="normal" font="default" size="100%">FEB</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">217</style></volume><pages><style face="normal" font="default" size="100%">106396</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Bentonite containing montmorillonite (Mt) as the major clay mineral is the potential buffer material of engineered barrier system in the deep geological repository for high-level waste management. The corrosion products of canister/or overpack material (carbon steel) may alter the basic characteristics of bentonite through Fe/clay interaction and formation of FeMt to certain extent. A convenient method is required for quantitative preparation of Fe(II)-Mt because the only few direct methods reported have some limitations. For this, weak ferrous complexes having good solubility to facilitate the cation-exchange with bentonite is essential. Therefore, Fe(II)-citrate, Fe(II)-ascorbate and Fe(II)-citrate/ascorbate were obtained here by dissolving the iron powder (Fe0) in citric acid (CA), ascorbic acid (AA) and their equimolar mixtures from 25 mM to 300 mM at 70 °C under N2 atmosphere. The redox potential was measured to monitor the dissolution of Fe0 in these mild organic acids. Higher dissolution of Fe0 occurred in CA + AA mixture. The dissolved iron in the form of ferrous complex was reasonably stable in inert atmosphere, Fe2+/Fetotal ≈ 1. The parent clay mineral (bentonite, NaMt) was treated with Fe(II) − cit/asc to form Fe(II) − Mt. through cation exchange process. The CEC and ferrous to ferric ratio of the Fe(II)-Mt was close to the stoichiometric amount. The XRF, XRD, ac impedance, FT-IR, TGA/DSC, XPS and FE-SEM are used for further characterization. In-situ complexation reaction of interlayer Fe2+ ions in Fe(II)-Mt with o-phenanthroline was also observed.</style></abstract><work-type><style face="normal" font="default" size="100%">Article</style></work-type><custom3><style face="normal" font="default" size="100%">Foreign</style></custom3><custom4><style face="normal" font="default" size="100%">5.467</style></custom4></record></records></xml>