Effect of structural iron on nanoscroll formation via exfoliation of a high iron-content kaolin

被引：0

作者：

Zsirka, Balazs ^{[1
]}

Gyorfi, Katalin ^{[1
]}

Yamaguchi, Takahide ^{[2
]}

Taborosi, Attila ^{[3
]}

Vagvolgyi, Veronika ^{[1
]}

Parameswary, Clara ^{[4
]}

Homonnay, Zoltan ^{[4
]}

Kuzmann, Erno ^{[4
]}

Horvath, Erzsebet ^{[1
]}

Kristof, Janos ^{[1
]}

机构：

[1] Univ Pannonia, Lab Surfaces & Nanostruct, Res Grp Analyt Chem, POB 158, H-8201 Veszprem, Hungary

[2] Ibaraki Univ, Inst Quantum Beam Sci, Grad Sch Sci & Engn, 2-1-1 Bunkyo, Mito, Ibaraki 3108512, Japan

[3] Shinshu Univ, Fac Engn, Res Initiat Supra Mat, 4-17-1 Wakasato, Nagano, Nagano 3808853, Japan

[4] Eotvos Lorand Univ, Inst Chem, Pazmany Peter s 1-A, H-1117 Budapest, Hungary

来源：

JOURNAL OF MATERIALS RESEARCH | 2023年 / 38卷 / 04期

关键词：

GRAFTED ORGANIC DERIVATIVES; GAUSSIAN-BASIS SETS; MOSSBAUER SPECTRUM; ETHYLENE-GLYCOL; ATOMS LI; SPECTROSCOPY; CLAY; INTERCALATION; MINERALS; SURFACE;

D O I：

10.1557/s43578-022-00768-y

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nanoscroll formation by casacade intercalation-exfoliation method was investigated for a high iron-content kaolin and after the removal of its iron-bearing mineral constituents (goethite, hematite) by 11 M HCl treatment. Hindered kaolinite nanoscroll formation was observed by TEM in both cases, where the 11 M HCl treatment only slightly improved the occurrence of nanoscrolled shapes. The presence of minor amounts of well-dispersed, resilient Fe was observed after the exfoliation of 11 M HCl-treated sample, which was identified as structural Fe3+/Fe2+ in the octahedral sheet of kaolinite by Mossbauer and X-ray absorption spectroscopy. Iron substitution in the nanokaolinite TO layers was probed by computational chemistry. The computational results indicate inner coordination changes and elongation of bonds in the iron-substituted TO structure, and the increased curvature values offer an explanation for the observed experimental results for hindered nanoscroll formation.

引用

页码：1074 / 1089

页数：16

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