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Preparation method and application of nitrogen-doped graphene-loaded carbon nitride composite material for activating persulfate

A technology of nitrogen-doped graphene and activated persulfate, used in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc.

Pending Publication Date: 2020-10-23
JIAXING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The problem to be solved in the present invention is to take g-C 3 N 4 Loaded on graphene materials to prepare a non-metallic catalyst that can efficiently catalyze and decompose PMS degradation pollutants under the condition of no light, and adopt a one-step method to synchronously pyrolyze and thermally polycondense rGO, melamine and urea to obtain a new type of PMS catalyst g-C 3 N 4 / rGO-N

Method used

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  • Preparation method and application of nitrogen-doped graphene-loaded carbon nitride composite material for activating persulfate
  • Preparation method and application of nitrogen-doped graphene-loaded carbon nitride composite material for activating persulfate
  • Preparation method and application of nitrogen-doped graphene-loaded carbon nitride composite material for activating persulfate

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preparation example Construction

[0033] The preparation method of the nitrogen-doped graphene-loaded carbon nitride composite material of activated persulfate comprises the following steps: S1, raw material, select commercial graphene, melamine, urea; S2, mixing, evenly mix commercial graphene, melamine, urea ; S3, calcining, the commercial graphene, melamine, and urea mixed uniformly in step S2 are placed in a tube furnace under a nitrogen atmosphere, and the temperature is controlled at 500-600°C for calcination, and the heating rate is controlled at 3-8°C / min , constant temperature for 220-250min, and cooled to room temperature under nitrogen atmosphere, the nitrogen-doped graphene-loaded carbon nitride composite material g-C with activated persulfate was obtained. 3 N 4 / rGO-N. where g-C 3 N 4 / rGO-N is non-toxic and cheap, and can be directly synthesized by thermal shrinkage of nitrogen-rich precursors such as melamine and dicyandiamide, and the acquisition method is relatively easy.

[0034] Wherein...

Embodiment 1

[0037] The preparation of the nitrogen-doped graphene-loaded carbon nitride composite material of activated persulfate is as follows:

[0038] Take 5g rGO, 5g melamine, and 5g urea, mix them evenly, put them in a 20ml corundum crucible with a cover, seal it with aluminum foil, put it into a 2 Calcined at different temperatures in a tube furnace for 30 min. The calcination time can be selected as any time point from 220 to 250 min, the preferred calcination time is 220, 240, 250 min, and the optimum time is 240 min. When the calcination time is less than 220min or greater than 250min, it will cause the preparation of g-C 3 N 4 / rGO-N caused damage to part of the graphite crystal structure. The heating rate can be controlled at any rate of 3-8°C / min, such as 3, 5, and 8°C / min. When the heating rate is lower than 3°C / min, the entire preparation time is relatively long, and the heating rate is greater than 8°C / min, which will cause uneven temperature changes inside and outsid...

Embodiment 2

[0042] The removal test of the dye AO7 by the nitrogen-doped graphene-supported carbon nitride composite material activated persulfate is as follows:

[0043] The nitrogen-doped graphene-loaded carbon nitride composite material with activated persulfate prepared in Example 1 was selected as a raw material to carry out comparative tests successively.

[0044] Among them, in the 50mg / LAO7 solution, add 20mg / Lg-C 3 N 4 / rGO-N and 307mg / LPMS, every once in a while, sampling, filtering to remove g-C 3 N 4 / rGO-N, the reaction was terminated by adding methanol, and the concentration change of AO7 in the reaction solution was analyzed by ultraviolet spectrophotometer.

[0045] As a comparison, conventional rGO and its N-doped samples or classical metal catalysts (Co 3 o 4 and Fe 3 o 4 ) as a catalyst, other conditions are the same as above.

[0046] Or add g-C alone 3 N 4 / rGO-N, no PMS, other conditions are the same as above.

[0047] Add PMS alone without g-C 3 N 4 / rG...

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Abstract

The invention provides a preparation method and application of a nitrogen-doped graphene-loaded carbon nitride composite material for activating persulfate. The preparation method comprises the following steps: S1, preparation of raw materials: selecting the commercial graphene, the melamine and the urea; S2, mixing: uniformly mixing commercial graphene, melamine and urea; S3, calcining: putting the commercial graphene, the melamine and the urea which are uniformly mixed in the step S2 into a tubular furnace in a nitrogen atmosphere, conducting calcining with a temperature controlled to be 500to 600 DEG C and a heating rate controlled to be 3-8 DEG C / min, allowing the temperature to be constant for 220-250 min, and performing cooling to room temperature in the nitrogen atmosphere so as toobtain the nitrogen-doped graphene-loaded carbon nitride composite material g-C3N4 / rGO-N for activating persulfate. The g-C3N4 / rGO-N has an efficient effect on removal of novel pollutants such as endocrine disruptors BPA and antibiotics CIP and removal of conventional dyes AO7 and OG, the dosage of a novel oxidation system catalyst and an oxidizing agent is small, and cost is low.

Description

technical field [0001] The invention relates to the preparation of a nitrogen-doped graphene-loaded carbon nitride composite material and its application to persulfate-based advanced oxidation water treatment technology, belonging to the technical field of water pollution control. Background technique [0002] Advanced oxidation technologies such as Fenton, Fenton-like, and photocatalytic technologies have been an effective method for degrading organic pollutants in the past few decades. Compared with these AOPs based on hydroxyl radicals (·OH), activated persulfate (PS) technology is developed in recent years with sulfate radicals (SO 4 ·- ) are novel AOPs whose main active species degrade pollutants. It has a higher redox potential, which can rapidly decompose most of the refractory organic pollutants and eventually mineralize them into CO 2 、H 2 O and inorganic salts, therefore, activated persulfate technology has become a research hotspot in the field of pollution co...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J21/18B01J35/10B01J37/08C02F1/72C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01J27/24B01J21/18B01J37/082C02F1/725C02F2101/305C02F2101/308C02F2101/345C02F2101/34C02F2101/36C02F2101/40C02F2101/38B01J35/643B01J35/638B01J35/635B01J35/633B01J35/651B01J35/647
Inventor 刘辉孙萍翟志才方应森
Owner JIAXING UNIV
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