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Preparation and application of molybdenum blue micro-tube based on Keggin type silicotungstate

A technology of silicotungstate and micron tubes, which is applied in the directions of crystal growth, solution from liquid solvent at room temperature, single crystal growth, etc., can solve the problem of oxidation, substituted heteropoly blue micron tubes which have not been reported, and heteropoly blue micron tubes. Problems such as difficulty in using

Inactive Publication Date: 2011-11-02
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Afterwards, we at SiW 12 -AA microtubes synthesized on the basis of SiW 12 Heteropoly blue micron tubes, but this all-tungsten series heteropoly blue micron tubes are unstable, easy to oxidize in the air, and very inconvenient to operate, making it difficult to further develop the utilization of this heteropoly blue micron tubes
[0004] In addition, the current research work on Keggin-type polyoxometalate nano-microtubes is almost all based on all-tungsten and all-molybdenum series polyoxometallates, while other metals partially replace tungsten or molybdenum polyoxometalate tubular materials. Few, research based on substituted heteropoly blue microtubes has not been reported

Method used

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  • Preparation and application of molybdenum blue micro-tube based on Keggin type silicotungstate
  • Preparation and application of molybdenum blue micro-tube based on Keggin type silicotungstate
  • Preparation and application of molybdenum blue micro-tube based on Keggin type silicotungstate

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Experimental program
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Embodiment 1

[0020] 3g of α-potassium silicotungstate (α-K 8 SiW 11 o 39 ) and 0.1g sodium molybdate (Na 2 MoO 4 )(K 8 SiW 11 o 39 and Na 2 MoO 4 The mass ratio is 30:1), dissolved in 10mL of water, adjusted to pH=1 with hydrochloric acid (HCl), the solution was placed in a 70°C water bath and heated, and 0.3g of ascorbic acid (ascorbic acid and K 8 SiW 11 o 39 The mass ratio is 1:10) for reduction, and after cooling to room temperature, a molybdenum blue microtube based on Keggin type silicotungstate is obtained.

Embodiment 2

[0022] 3g of α-potassium silicotungstate (α-K 8 SiW 11 o 39 ) and 0.15g sodium molybdate (Na 2 MoO 4 )(K 8 SiW 11 o 39 and Na 2 MoO 4 The mass ratio is 20:1), dissolved in 10mL water, with phosphoric acid (H 3 PO 4 ) to adjust the pH=1.5, place the solution in an 80°C water bath and heat, add 0.6g ascorbic acid (ascorbic acid and K 8 SiW 11 o 39 The mass ratio is 2:10) for reduction, and after cooling to room temperature, a molybdenum blue microtube based on Keggin type silicotungstate is obtained.

Embodiment 3

[0024] 3g of α-potassium silicotungstate (α-K 8 SiW 11 o 39 ) and 0.2g sodium molybdate (Na 2 MoO 4 )(K 8 SiW 11 o 39 and Na 2 MoO 4The mass ratio is 15:1), dissolved in 10mL of water, adjusted to pH=2 with hydrochloric acid (HCl), the solution was heated in a water bath at 90°C, and 0.9g of ascorbic acid (ascorbic acid and K 8 SiW 11 o 39 The mass ratio is 3:10) for reduction, and after cooling to room temperature, a molybdenum blue microtube based on Keggin type silicotungstate is obtained.

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Abstract

The invention belongs to the field of chemical synthetic materials, and specifically relates to preparation and application of molybdenum blue micro-tubes based on Keggin type silicotungstate. In the invention, stable Mo-substituted Keggin type silicotungstate molybdenum blue micro-tubes are prepared from metastable nonsaturated alpha-Keggin heteropolyacid salts by utilizing high redox potential of Mo. According to the invention, the limitation that only saturated tungsten polyoxometallates and molybdenum polyoxometallates are used in the prior art is broken; Keggin type heteropolytungstate micro-tubes comprising different components are assembled through regulation and control of counter cations, and other metal-substituted Keggin type heteropolytungstate micro-tubes with excellent performance are obtained by changing composition of anions of heteropolyoxometallates. Noble metal nanoparticles are immobilized in situ by utilizing stable reducibility of the molybdenum blue micro-tubes.

Description

technical field [0001] The invention belongs to chemical synthesis materials, and in particular relates to the preparation and application of molybdenum blue microtubes with Keggin type silicotungstate as the matrix. Background technique [0002] Polyoxometalates are a unique class of inorganic metal oxide clusters. In recent decades, polyoxometalates have attracted much attention due to their wide application in many fields. The redox behavior of polyoxometalates is particularly attractive. Under the condition of keeping the structure unchanged, polyoxometallates can undergo a stepwise redox process to form dark blue mixed valence heteropoly blues or deeply reduced products. Polyoxometalates are widely used in sensing materials such as photochromic, electrochromic and aerochromic due to the significant color change throughout the process. Molybdenum blue is an important member of the heteropoly blue family and is widely used in analytical chemistry. At present, people hav...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B29/32C30B7/00C04B35/495
Inventor 彭军申燕张焕秋
Owner NORTHEAST NORMAL UNIVERSITY
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