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Publication
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| Research Title |
Intercalation of Zinc Sulfide-Manganese Sulfide in Montmorillonite by Solid-Solid Reaction |
| Date of Distribution |
11 May 2013 |
| Conference |
| Title of the Conference |
International Symposium on Materials Chemistry of Intercalation Compounds (MCIC2013) |
| Organiser |
committee of MCIC2013 |
| Conference Place |
Waseda Campus, Waseda University |
| Province/State |
Nishiwaseda, Shinjuku-ku, Tokyo |
| Conference Date |
11 May 2013 |
| To |
11 May 2013 |
| Proceeding Paper |
| Volume |
1 |
| Issue |
1 |
| Page |
- |
| Editors/edition/publisher |
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| Abstract |
Intercalation of organic and/or inorganic species in the interlayer spaces of layered
inorganic solids is an interesting topic for constructing ordered organic-inorganic or
inorganic-inorganic materials with unique nanostructures controlled by host-guest and
guest-guest interactions [1]. Montmorillonite is a 2:1 layered clay mineral, which exhibits
useful characteristics including large surface area, swelling ability, adsorptive and cation
exchange properties for creating functional intercalation compounds.
On the other hand, mixed metal sulfides have attracted considerable attention due to its
tunable surface and optical properties. Several complicated methods such as reverse
micelle, microemulsion-mediation and core-shell processes have been carried out to
synthesize mixed metal sulfides including zinc sulfide-manganese sulfide and so on [2].
Here, a facile method, solid-solid reaction, was used to prepare mixed zinc
sulfide-manganese sulfide in the interlayer space of montmorillonite. The in-situ
formation of zinc sulfide and manganese sulfide in montmorillonite may lead to a highly
luminescent hybrid. Zinc(II)-manganese(II) exchanged montmorillonite was prepared by
adding the aqueous solutions of zinc(II) chloride (ZnCl
2
) and manganese(II) chloride
tetrahydrate (MnCl
2
∙4H
2
O) into a dispersion of montmorillonite. The mixture was stirred
overnight. The amount of the added zinc(II) or manganese(II) cation was 60 meq/ 100 g
clay. The resulting solid was separated by centrifugation and washed repeatedly with
deionized water until a negative chloride test was obtained and dried at 60°C in air atmosphere for 24 h. The solid was called
zinc(II)-manganese(II)-montmorillonite. The
mixed metal exchanged montmorillonite and
sodium sulfide (Na
2S∙xH2
O) were manually
ground in an agate mortar for 10-15 minutes
and subsequently heated at 200°C for 1 h in air.
The product was named zinc sulfide-manganese
sulfide@montmorillonite. After the solidsolid reaction, the XRD pattern of the product
showed the basal spacing of 1.46 nm. No
reflection due to zinc sulfide, manganese sulfide,
sodium sulfide and/or their compounds was
seen in the XRD pattern of the product. This
result indicated to the intercalation of sulfide
ions in montmorillonite. Raman spectrum of
the hybrid showed two broad and weak peaks at 261 and 344 cm
-1
due to first-order LO and
TO phonons of zinc sulfide, a intense peak due to manganese sulfide was observed at 511
cm
-1
, supporting the formation of zinc sulfide and manganese sulfide in the hybrids. The
absorption onset (Fig. 1b) observed at 338 nm was blue-shifted compared with those of
pure zinc sulfide (348 nm, Fig. 1d) and manganese sulfide (350 nm, Fig. 1c), suggesting
that the particle size of the incorporated mixed metal sulfides was smaller than that of the
pure metal sulfides. The hybrid exhibited three emission bands (Fig. 1b) at 416, 438, 469
nm. The emissions peaks of zinc sulfide and manganese sulfide were seen at 451 and 469,
as well as at 480 nm. The blue shift of three emission maxima (416, 438 and 469 nm) of
the hybrid was due to the de-aggregation of zinc sulfide and manganese sulfide in the
hybrid. In addition, the photoluminescence intensity of the hybrid was higher than those
of zinc sulfide and manganese sulfide, indicating that the photoluminescence efficiencies of
both zinc sulfide and manganese sulfide could be improved by the confinements into the
interlayer space of montmorillonite. These results supported that zinc sulfide and
manganese sulfide was successfully intercalated in montmorillonite by solid-solid reaction. |
| Author |
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| Peer Review Status |
มีผู้ประเมินอิสระ |
| Level of Conference |
นานาชาติ |
| Type of Proceeding |
Abstract |
| Type of Presentation |
Oral |
| Part of thesis |
true |
| ใช้สำหรับสำเร็จการศึกษา |
ไม่เป็น |
| Presentation awarding |
false |
| Attach file |
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| Citation |
0
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Journal Publication
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