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A titanium dioxide/activated carbon composite co-doped with iron, nitrogen and cobalt, its preparation method and its application as a photocatalyst

A technology of titanium dioxide and activated carbon, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as limited application range, low degradation efficiency, and difficult control of hydrolysis speed, so as to achieve high efficiency and improve Adsorptive effect

Active Publication Date: 2021-06-29
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the loading amount of modified titanium dioxide and the hydrolysis rate during the preparation process are not easy to control, and it is difficult for the prepared composite photocatalyst to exert the synergistic effect of adsorption and degradation.
For example, patent CN108786732 prepared a titanium dioxide / biomass activated carbon composite photocatalyst by sol-gel method. This kind of photocatalyst does not modify titanium dioxide, and the degradation efficiency is high only when it is irradiated by ultraviolet light. Low, low utilization rate of light source, and limits its application range
The iron and nitrogen co-doped titanium dioxide / activated carbon photocatalyst prepared by the patent CN103240110 adopts the preparation method of sol impregnation, the hydrolysis rate of the titanium dioxide in the preparation process is difficult to control, and the sol impregnation easily leads to the spontaneous hydrolysis of the excess sol to form free titanium dioxide particles, so that the activated carbon cannot be loaded. completely

Method used

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  • A titanium dioxide/activated carbon composite co-doped with iron, nitrogen and cobalt, its preparation method and its application as a photocatalyst
  • A titanium dioxide/activated carbon composite co-doped with iron, nitrogen and cobalt, its preparation method and its application as a photocatalyst
  • A titanium dioxide/activated carbon composite co-doped with iron, nitrogen and cobalt, its preparation method and its application as a photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of iron, nitrogen, cobalt co-doped titanium dioxide / activated carbon composite, the specific steps are as follows:

[0030] Step 1: Place the powdered coconut shell activated carbon in a 10% KOH solution, soak for 24 hours, then wash it with distilled water and absolute ethanol several times, and dry it for later use; lye treatment can improve the nitrogen oxides of activated carbon Selective adsorption; distilled water can remove excess KOH and other water-soluble impurities, and absolute ethanol washing can remove some residual organic impurities. Among them, the tail gas removal rate of AC (activated carbon) without KOH treatment was 39.8%, and the removal rate of AC tail gas after pretreatment was 56.1%.

[0031] Step 2: Mix absolute ethanol with a volume ratio of 5:1 and butyl titanate and stir evenly, add nitric acid to adjust the pH until the pH is 2, and obtain a mixed solution A;

[0032] Step 3: Add ferric nitrate, urea and cobalt nitrate...

Embodiment 2

[0038] A preparation method of iron, nitrogen, cobalt co-doped titanium dioxide / activated carbon composite, the specific steps are as follows:

[0039] Step 1, soak the powdered coconut shell activated carbon in a 10% NaOH solution for 24 hours, then wash it with distilled water and absolute ethanol several times, and dry it for later use;

[0040] Step 2: Mix absolute ethanol with a volume ratio of 5:1 and butyl titanate and stir evenly, and adjust the pH with nitric acid until the pH is 1 to obtain a mixed solution A;

[0041]Step 3: Add the three dopants of ferric nitrate, urea and cobalt nitrate to the mixed solution A, stir at high speed until they are all dissolved, and obtain the mixed solution B, wherein the mass ratio of ferric nitrate, urea, cobalt nitrate and butyl titanate is 0.05:0.08:0.07:1;

[0042] Step 4: Put the activated carbon carrier prepared in step 1 in a petri dish, absorb the mixed solution B and add it dropwise to the activated carbon, disperse it by...

Embodiment 3

[0047] A preparation method of iron, nitrogen, cobalt co-doped titanium dioxide / activated carbon composite, the specific steps are as follows:

[0048] Step 1, after immersing the powdered coconut shell activated carbon in a KOH solution with a concentration of 10% for 24 hours, wash it with distilled water and absolute ethanol several times, and dry it for later use;

[0049] Step 2: Mix and stir absolute ethanol and butyl titanate with a volume ratio of 5:1, and adjust the pH with sulfuric acid until the pH is 1.5 to obtain a mixture A;

[0050] Step 3: Add the three dopants of ferric nitrate, urea and cobalt nitrate to the mixed solution A, stir at high speed until they are all dissolved, and obtain the mixed solution B, wherein the mass ratio of ferric nitrate, urea, cobalt nitrate and butyl titanate is 0.05:0.08:0.07:1;

[0051] Step 4: Place the activated carbon carrier prepared in step 1 in a petri dish, absorb the mixed solution B and add it dropwise to the activated ...

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Abstract

The invention discloses a titanium dioxide / activated carbon compound co-doped with iron, nitrogen and cobalt, a preparation method and its application as a photocatalyst, belonging to the field of titanium dioxide compounding. A preparation method of a titanium dioxide / activated carbon composite co-doped with iron, nitrogen and cobalt, comprising the following steps: 1) dissolving butyl titanate in absolute ethanol to obtain a mixed solution A; 2) mixing ferric nitrate, urea and cobalt nitrate are dissolved in the mixed solution A to obtain the mixed solution B; 3) the mixed solution B is dispersed in activated carbon to obtain the load A; 4) the load A is placed in the atmosphere of water vapor and absolute ethanol vapor, Obtaining the load B; 5) calcining the load B to obtain a titanium dioxide / activated carbon composite co-doped with iron, nitrogen and cobalt. The preparation method controls the shape and particle size of the titanium dioxide on the activated carbon by controlling the hydrolysis rate of the titanate, and obtains an ideal photocatalyst.

Description

technical field [0001] The invention belongs to the field of titanium dioxide composites, in particular to a titanium dioxide / activated carbon composite co-doped with iron, nitrogen and cobalt, a preparation method and its application as a photocatalyst. Background technique [0002] With the continuous increase of car ownership, the problem of exhaust pollution needs to be solved urgently. For this reason, photocatalyst titanium dioxide is favored in the field of exhaust gas purification due to its high catalytic activity, chemical stability and non-toxic and harmless characteristics. For this reason, people have developed photocatalytic exhaust gas degradation materials, among which photocatalytic coatings loaded with nano-titanium dioxide are one of them. Nano-titanium dioxide is used as a photocatalyst, which can catalyze and oxidize most pollutants in the air, and the degradation products are free. Toxic and harmless small molecular substances. [0003] At present, ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01D53/86B01J20/20B01J20/30B01D53/56B01D53/70
CPCB01D53/8628B01D53/8662B01J20/20B01J27/24B01J35/004B01J35/023
Inventor 夏慧芸刘冠宇宋莉芳赵旭耿通陈彤丹陈华鑫
Owner CHANGAN UNIV
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