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Adsorbent with photocatalytic activity, and preparation method and application thereof

A technology of photocatalytic activity and adsorbent, which is applied in the field of adsorption and catalysis, and can solve the problems of low titanium dioxide loading and poor stability.

Pending Publication Date: 2020-02-28
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an adsorbent with photocatalytic activity and its preparation method and application. The adsorbent prepared by the present invention solves the problems of low loading capacity and poor stability of titanium dioxide, and the preparation process is simple. The obtained adsorbent has Good photocatalytic performance for efficient and non-toxic removal of organic pollutants

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  • Adsorbent with photocatalytic activity, and preparation method and application thereof
  • Adsorbent with photocatalytic activity, and preparation method and application thereof

Examples

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preparation example Construction

[0025] The invention provides a method for preparing an adsorbent with photocatalytic activity, comprising the following steps:

[0026] Mix water glass and calcium hydroxide for hydrothermal reaction to obtain mesoporous calcium silicate material with rich wrinkled structure on the surface;

[0027] Tetrabutyl titanate was dissolved in ethanol to obtain solution A;

[0028] Mix acetic acid, water and ethanol to obtain solution B;

[0029] Mixing the mesoporous calcium silicate material with solution B to obtain system C;

[0030] The solution A is added dropwise into the system C, and the adsorbent with photocatalytic activity is obtained through aging, drying and roasting in sequence.

[0031] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known in the art.

[0032]In the invention, water glass and calcium hydroxide are mixed for hydrothermal reaction to obtain mesoporous calcium silicate material with...

Embodiment 1

[0043] Using water glass and calcium hydroxide as materials, a mesoporous calcium silicate material (CSH) with rich wrinkle structure on the surface was synthesized by one-step hydrothermal synthesis. The specific preparation process is as follows: an appropriate amount of Na 2 SiO 3 Dissolve in deionized water, then add Ca(OH) at room temperature according to the molar ratio of Ca and Si at 1:1 under vigorous stirring 2 , and continued stirring at 70°C for 4h. Use NaOH solution to adjust the pH of the resulting system to 12, then transfer the liquid to a hydrothermal reactor, react at 120°C and 1.5MPa for 2 hours, then cool naturally to ambient temperature (about 25°C), and filter and dry Finally, CSH white powder is finally obtained.

[0044] Dissolve 10mL of tetrabutyl titanate in 35mL of absolute ethanol to obtain solution A; take 4mL of glacial acetic acid and 10mL of deionized water and dissolve them in 70mL of absolute ethanol to obtain solution B, adjust the pH to 3...

Embodiment 2

[0053] The preparation method of the mesoporous calcium silicate material is the same as in Example 1. Take 8 mL of tetrabutyl titanate in 28 mL of absolute ethanol to obtain solution A; take 3.5 mL of glacial acetic acid and 8 mL of deionized water in 60 mL of absolute ethanol to obtain solution B , adjust the pH to 3, add 3.8g of mesoporous calcium silicate material to solution B, stir rapidly to obtain system C; add solution A dropwise to system C to obtain a white sol, and obtain a white gel after aging for 18 hours. The gel was dried in an oven at 120°C and ground to powder, then placed in a muffle furnace and sintered at 500°C for 5 hours to obtain an adsorbent with photocatalytic activity and abundant wrinkles on the surface, with a loading capacity of 32.32%.

[0054] Put 2g of the above product under the irradiation power of 0.28W / m 2 The photocatalytic research of 20mg / L bisphenol A was carried out under the xenon lamp. After 7 hours of irradiation, the removal rate ...

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Abstract

The invention relates to the technical fields of adsorption and catalysis, specifically to an adsorbent with photocatalytic activity, and a preparation method and an application thereof. The preparation method provided by the invention comprises the following steps: mixing sodium silicate and calcium hydroxide, and carrying out a hydrothermal reaction so as to obtain a mesoporous calcium silicatematerial with a surface rich in wrinkle structures; dissolving tetrabutyl titanate into ethanol so as to obtain a solution A; mixing acetic acid, water and ethanol so as to obtain a solution B; mixingthe mesoporous calcium silicate material with the solution B so as to obtain a system C; and dropwise adding the solution A into the system C, and sequentially carrying out aging, drying and calcining so as to obtain the adsorbent with photocatalytic activity. According to the invention, the mesoporous calcium silicate material with the surface rich in wrinkle structures is used as a carrier, andtitanium dioxide can be uniformly coated to the surface and internal pores of calcium silicate by a sol-gel method, so the loading capacity of titanium dioxide can be improved, and the adsorption efficiency, photocatalytic activity and catalytic decomposition effect of a material are greatly improved.

Description

technical field [0001] The invention relates to the technical field of adsorption and catalysis, in particular to an adsorbent with photocatalytic activity and its preparation method and application. Background technique [0002] With the rapid development of modern industrial and agricultural production, industrial waste, pesticides, fertilizers and hormones and other organic pollutants (such as PAHs, PCBs, aromatic nitro compounds, etc.) continue to invade the environment, especially in the water environment, where the accumulation of harm is the most serious . Organic pollutants often have high toxicity, high accumulation, refractory degradation, long-distance migration and "three-cause" effects (ie, mutagenic, carcinogenic and teratogenic effects), so the development of efficient treatment technologies for organic pollutants has become the current environmental pollution An important topic in governance. At present, the common method to deal with organic pollutants is ...

Claims

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Application Information

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IPC IPC(8): B01J20/04B01J20/30C02F1/30B01J21/06B01J23/02B01J37/10B01J37/02B01J35/10B01J32/00C02F101/34C02F101/30
CPCB01J20/04C02F1/30B01J21/063B01J23/02B01J37/10B01J37/0215C02F2101/345C02F2101/30C02F2305/10B01J35/39B01J35/61
Inventor 温变英姜超樊保民
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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