Method for preparing melem capable of degrading various dyes

A melem, degradable technology, applied in the field of photocatalytic materials and their preparation, can solve the problems of complicated reaction operation process and long cycle, and achieve the effect of shortening the preparation cycle, easy operation and broad application prospect.

Inactive Publication Date: 2016-02-03
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The preparation method of existing melem, its reaction operation process is more numerous and diverse, and the cycle i

Method used

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  • Method for preparing melem capable of degrading various dyes
  • Method for preparing melem capable of degrading various dyes
  • Method for preparing melem capable of degrading various dyes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 The following steps were used to prepare melem: 2.5 g of melamine was weighed into a corundum ark, covered, and the corundum ark was placed in a closed tube furnace. Vacuumize, return to normal pressure with argon gas, argon flow rate is 50sccm, sintering temperature is 400-450°C, heating and cooling rate is 10°C / min, holding time is 2 hours, and the product is ground and collected.

[0025] The X-ray diffraction pattern analysis result of gained product shows that it is the melem of hexagonal crystal system, as figure 1 shown. Scanning electron microscopy shows microscopically that this process prepares melem nanowire bundles, such as figure 2 shown.

[0026] Taking rhodamine B as an example, the application experiment of the melem catalyzed degradation dye prepared by this embodiment is described as follows: take 20 mg of melem, add it to a test tube containing 40 ml of rhodamine B at a concentration of 20 ppm, and stir it in the dark After 40 minutes to...

Embodiment 2

[0029] Example 2 Weigh 1 g of melamine and put it into a corundum ark, cover it, and place the corundum ark in a closed tube furnace. Vacuumize, return to normal pressure with argon gas, the argon flow rate is 50 sccm, the sintering temperature is 500°C, the heating and cooling rate is 10°C / min, the holding time is 2 hours, and the product is ground and collected.

Embodiment 3

[0030] Example 3 Weigh 3 g of melamine and put it into a corundum ark, cover it, and place the corundum ark in a closed tube furnace. Vacuumize, return to normal pressure with argon gas, the argon flow rate is 40 sccm, the sintering temperature is 400-450°C, the heating and cooling rate is 10°C / min, and the holding time is 5 hours. The product is ground and collected.

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Abstract

The invention discloses a method for preparing melem capable of degrading various dyes. The method comprises the following steps that firstly, melamine is put into a corundum ark, a cover is applied, the corundum ark is put into a sealed tube furnace, and vacuum pumping and argon introduction are carried out for normal pressure restoration, wherein the flow speed of argon ranges from 40 sccm to 60 sccm, the sintering temperature ranges from 400 DEG C to 500 DEG C, both of the temperature rise rate and the cooling rate range from 8 DEG C/min to 15 EDG C/min, and the temperature preservation time ranges from 1.5 h to 10 h; a product is ground and collected. According to the method, the one-step sintering method is adopted for preparing melem, the needed sintering temperature is low, the preparing cycle is short, and prepared melem can be used for catalyzing degradation of rhodamine B, methyl orange, Congo red, methylene blue, methyl blue, malachite green and other dyes under illumination of mercury lamps. The method is simple and easy to implement and popularize.

Description

technical field [0001] The invention relates to a photocatalytic material and a preparation method thereof, in particular to a melem and a preparation method thereof, and belongs to the technical field of photocatalytic materials and their preparation and application. Background technique [0002] Mellem is an organic synthetic material with a long history. It was studied by Liebig as early as 1834. Due to the insolubility of melem, the heptazine ring always contained in the molecular structure has not been recognized until 1937. Pauling and Sturdivant obtained its molecular formula through assumptions. In 2003, Schnick and his colleagues reported the crystal structure and spectrum of melem in detail, and proved that melem is an important intermediate product in the process of preparing g-C3N4 by thermal condensation of melamine, and the temperature range of its formation is 400 °C ~450℃, because of the nucleophilicity of the amino group, melem can react with electrophilic ...

Claims

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Application Information

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IPC IPC(8): B01J31/02C07D487/16C02F1/30
Inventor 简基康雷仁博曹丙垒
Owner GUANGDONG UNIV OF TECH
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