Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing zinc oxide crystal with internally in-situ formed mesoporous structure

A mesoporous structure, zinc oxide technology, applied in chemical instruments and methods, crystal growth, single crystal growth and other directions, can solve the problems of difficult to generate mesoporous structure, single structure of zinc oxide nanomaterials, etc.

Inactive Publication Date: 2014-05-07
HENAN UNIV OF SCI & TECH
View PDF9 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the disadvantages that the zinc oxide nanomaterials prepared in the prior art have a single structure and it is difficult to form a mesoporous structure inside the zinc oxide crystal, the present invention provides a method for forming a zinc oxide crystal with a mesoporous structure inside

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing zinc oxide crystal with internally in-situ formed mesoporous structure
  • Method for preparing zinc oxide crystal with internally in-situ formed mesoporous structure
  • Method for preparing zinc oxide crystal with internally in-situ formed mesoporous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for forming zinc oxide crystals with a mesoporous structure in situ, comprising the following steps:

[0028] Step 1: Prepare 0.01mol·L respectively -1 Zinc acetate aqueous solution and 0.01mol·L -1 The hexamethylenetetramine aqueous solution, standby;

[0029] Step 2: heating the hexamethylenetetramine aqueous solution obtained in Step 1 to 85°C;

[0030] Step 3: Mix the zinc salt aqueous solution obtained in step 1 and the hexamethylenetetramine aqueous solution obtained in step 2 according to the ratio of zinc acetate and hexamethylenetetramine molar ratio of 1:1 to obtain a colloidal solution. Add 0.1ml of formaldehyde solution with a concentration of 40% to the solution, then transfer it to the reaction kettle, react for 8 hours at a pressure of 0.2MPa and a temperature of 85~95°C, and then cool to room temperature;

[0031] Step 4: Suction filter the system obtained after the reaction in Step 3, rinse the obtained filter cake with water and absolute et...

Embodiment 2

[0035] A method for forming zinc oxide crystals with a mesoporous structure in situ, comprising the following steps:

[0036] Step 1: Prepare 0.03mol·L respectively -1 zinc salt solution and 0.03mol L -1 The hexamethylenetetramine aqueous solution, standby;

[0037] Step 2: heating the hexamethylenetetramine aqueous solution obtained in Step 1 to 85°C;

[0038] Step 3: Mix the zinc salt aqueous solution obtained in step 1 and the hexamethylenetetramine aqueous solution obtained in step 2 according to the ratio of zinc acetate and hexamethylenetetramine molar ratio of 1:1 to obtain a colloidal solution. Add 0.5ml of formaldehyde solution with a concentration of 40% to the solution, then transfer it to the reaction kettle, react for 8 hours at a pressure of 0.3MPa and a temperature of 110~125°C, and then cool to room temperature;

[0039] Step 4: Suction filter the system obtained after the reaction in Step 3, rinse the obtained filter cake with water and absolute ethanol for...

Embodiment 3

[0043] A method for forming zinc oxide crystals with a mesoporous structure in situ, comprising the following steps:

[0044] Step 1: Prepare 0.05mol·L respectively -1 Zinc chloride aqueous solution and 0.05mol L -1 The hexamethylenetetramine aqueous solution, standby;

[0045] Step 2: heating the hexamethylenetetramine aqueous solution obtained in Step 1 to 85°C;

[0046]Step 3: Mix the zinc salt aqueous solution obtained in step 1 and the hexamethylenetetramine aqueous solution obtained in step 2 according to the ratio of zinc chloride and hexamethylenetetramine molar ratio of 1:1 to obtain a colloidal solution, and then Add trisodium citrate to the colloid solution so that the concentration of trisodium citrate in the mixed solution is 0.1mmol L -1 , add 1ml of formaldehyde solution with a concentration of 40% to the mixed solution, then transfer it to the reaction kettle, react for 8 hours under the conditions of pressure of 0.2MPa and temperature of 85~95℃, and then co...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of nanometer material preparation, and in particular relates to a method for preparing zinc oxide crystal with an internally in-situ formed mesoporous structure. Hydrothermal reaction is carried out in a high-pressure sealed environment, formaldehyde is adsorbed on the surface of a crystal and is subjected to decomposition reaction to generate micromolecular gases such as CO, CO2 and H2, and the micromolecular gases are adsorbed on the surface of the crystal without escaping from the system and occupy zinc oxide deposition sites, so as to form a porous structure; besides, the amount of formaldehyde can influence the pore density and the pore size, and the conventional hydrothermal reaction only generates little formaldehyde, so that pore-forming phenomenon is not obvious or no pores are formed; formaldehyde solution is additionally added on the basis, so as to form obvious pore-forming phenomenon; the method can prepare the zinc oxide (ZnO) nanometer material with controllable morphology and the mesoporous structure inside the crystal; the specific surface area of prepared mesoporous zinc oxide can reach 121m<2>g<-1> and is three times of that of imporous zinc oxide nanometer structure under the same conditions.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation, in particular to a method for forming zinc oxide crystals with mesoporous structures in situ. Background technique [0002] Nano-zinc oxide has attracted the attention of researchers because of its unique physical and chemical properties and broad application prospects. ZnO nanomaterials with different morphologies and novel structures have been prepared and applied in the fields of photocatalysis, gas sensing, sensing and chemical power supply. Zinc oxide is a polar molecule, mainly having (0001) and (000) polar crystal planes and (100) and (110) non-polar crystal planes. Normally, if there is no structure modifier, the polar (0001) crystal plane has the highest chemical activity, and the growth rate of this crystal plane is faster than other crystal planes in the solution system. Change the reactivity of the (0001) surface, and then achieve the purpose of controlling the morpho...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C30B29/16C30B7/10
Inventor 杜凯雷建飞魏荣慧李新忠邰玉萍
Owner HENAN UNIV OF SCI & TECH