CN115138351B - Synthesis method of adsorption catalyst with in-situ regeneration function - Google Patents

Synthesis method of adsorption catalyst with in-situ regeneration function Download PDF

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CN115138351B
CN115138351B CN202210561699.3A CN202210561699A CN115138351B CN 115138351 B CN115138351 B CN 115138351B CN 202210561699 A CN202210561699 A CN 202210561699A CN 115138351 B CN115138351 B CN 115138351B
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activated carbon
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tio
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CN115138351A (en
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陈飞
夏冰
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Beijing Fulaishibo Technology Development Co ltd
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Abstract

The invention discloses an SiO with in-situ regeneration function 2 /TiO 2 The preparation method of the AC composite adsorption catalyst material comprises the following steps: 1) Preparing a silicon oxide precursor solution A; 2) By N 2 H 4 ·H 2 O-modified activated carbon; 3) Will N 2 H 4 ·H 2 Adding the O modified activated carbon into the silicon precursor solution A to obtain pretreated activated carbon B; 4) Preparing a titanium oxide precursor solution C; 5) Adding the pretreated activated carbon B into the titanium oxide precursor solution C, mixing and drying to obtain SiO 2 /TiO 2 An AC composite adsorption catalyst. The preparation method does not need high-temperature sintering, so that the structure of the AC is not collapsed; on the other hand, siO is used 2 Bonding TiO as an inert barrier layer 2 A molecular protective base material; at the same time, under the condition of light excitation, nano TiO 2 The activated carbon adsorption sites can be regenerated by activating the active oxygen substances to degrade the organic molecules adsorbed on the activated carbon, so that the activated carbon has long-term stable in-situ regeneration adsorption capacity.

Description

Synthesis method of adsorption catalyst with in-situ regeneration function
Technical Field
The invention relates to the field of engineering nano material manufacturing, in particular to a SiO (silicon dioxide) with in-situ regeneration function 2 /TiO 2 A method for synthesizing the composite adsorption catalyst material of the activated carbon.
Background
The adsorption separation and removal of contaminants using Activated Carbon (AC) is the most widely practiced unit operation in industry and has the advantages of broad spectrum, high efficiency and low cost. However, adsorption saturated activated carbon presents a great safety risk for storage and disposal as hazardous waste due to the enrichment of toxic and harmful pollutants.
Low cost, high efficiency activated carbon in situ regeneration technology and products have been receiving extensive attention. The operation of chemical solvent regeneration is complex and produces a large concentrated waste stream. Electrochemical regeneration requires expensive chemicals, resulting in high operating costs. Microbial regeneration is typically a time consuming and efficient only biodegradable compound. Thermal regeneration is the most mature industrial process, but the energy cost of thermal regeneration is still a serious constraint of industry. Meanwhile, thermal regeneration requires off-site regeneration, which can result in considerable carbon loss (5-10%) and incomplete regeneration if the activated carbon is saturated with non-volatile organic compounds. In addition, the large concentrated waste stream desorbed from the thermal regeneration process still requires further purification treatment.
Traditional tetrabutyl titanate sol-gel process is applied to TiO 2 The AC compound generally needs about 500 DEG sintering crystallization process, which not only can lead to structural collapse of AC, reduced specific surface area and TiO 2 High temperature crystal growth and aggregation also lead to a decrease in photocatalyst activity. In addition, in TiO 2 In the catalytic oxidation process, strong oxidizing substances such as OH free radicals and the like generated can oxidize the substrate carbon material, so that TiO is loaded 2 The molecules fall off.
For example, chinese patent CN114073934a discloses an activated carbon composite and a method for preparing the same, comprising compositing P25 titanium dioxide and metal nanoparticles with surface plasmon resonance effect on the surface of activated carbon to form a composite. The preparation method comprises the steps of firstly preparing a suspension of P25 titanium dioxide and a metal precursor with a surface plasmon resonance effect, then adjusting the pH value, carrying out adhesion of the obtained P25 titanium dioxide loaded with metal hydroxide particles on the surfaces of activated carbon particles through an adhesive, and finally sintering to obtain the activated carbon composite material.
Chinese patent CN110302804B discloses a VS 4 -TiO 2 AC photocatalyst, comprising VS 4 、TiO 2 And activated carbon, the VS 4 And TiO 2 Post-compounding loadOn the activated carbon, the preparation method comprises the following steps: pretreatment of activated carbon and hydrothermal reaction for preparing VS 4 Adding tetrabutyl titanate solution into powder particles, adjusting pH to acidity, adding pretreated activated carbon, stirring to obtain a mixture of activated carbon and gel, aging, oven drying, calcining, and other post-treatment processes to obtain VS 4 -TiO 2 AC photocatalyst.
Chinese patent CN110732319 discloses a method for preparing a wood activated carbon body loaded titanium dioxide material, comprising the steps of: carrying out hydrothermal treatment on the wood material to obtain a pretreated test material; placing the pretreated test material in tetrabutyl titanate solution, and performing first impregnation treatment; carbonizing the first dry test material to obtain a carbonized test material; placing the carbonized test material in a phosphoric acid solution, performing second soaking treatment, and drying to obtain a second dry test material; and (3) performing activation treatment on the second dry test material to obtain the wood activated carbon body-loaded titanium dioxide material.
Therefore, the existing preparation method of the composite material of the titanium dioxide and the activated carbon is always a mixing and calcining process, but the catalyst prepared by the process can cause considerable carbon loss during regeneration, has shorter cycle life and relatively higher energy consumption during the preparation process.
Photocatalytic regeneration is the most interesting activated carbon regeneration technology, and the following advantages are achieved by utilizing photocatalytic regeneration: firstly, the energy requirement is low, and the solar energy can be assisted by solar radiation; secondly, the reduction of the adsorption capacity of the activated carbon is minimal without adding high-oxidability chemical substances; thirdly, in-situ or in-situ regeneration mode can be adopted in the process operation; finally, since the photocatalytic process can directly mineralize the adsorbed contaminants into CO 2 And H is 2 O, no subsequent further treatment of the contaminants resulting from desorption is required. TiO (titanium dioxide) 2 The method has the characteristics of high efficiency, low cost and good chemical stability, and is the most widely applied photocatalyst material, so that the synthetic TiO2/AC composite material realizes the effective utilization of the photocatalytic regeneration adsorbent and is widely focused.
TiO 2 Regeneration of adsorption saturated active carbon in photocatalysis processIn the reaction mechanism, the method mainly depends on active oxygen species such as hydroxyl radicals generated in the photo-excitation process, and the active oxygen species diffuse to the adsorption position of inert active carbon to oxidize adsorbed pollutant molecules. But active oxygen species such as hydroxyl free radicals have the characteristics of low service life and short diffusion distance, so that adsorption photocatalysis is required to synthesize TiO controllably in micro-nano scale 2 AC composite, simple mixed TiO 2 The method can not effectively utilize the photocatalysis process to regenerate the AC with the AC, and needs to realize TiO taking the AC as a base material 2 And (5) in-situ synthesis. Therefore, there is a need to develop TiO with AC protection function 2 Low temperature processing of AC composite.
Disclosure of Invention
In view of the problems of the prior art, according to one aspect of the present invention, an object of the present invention is to provide SiO with in-situ regeneration function 2 /TiO 2 A low temperature process for producing an AC composite adsorption catalyst material.
In order to achieve the above object of the present invention, an SiO with in-situ regeneration function of the present invention 2 /TiO 2 The preparation method of the AC composite adsorption catalyst material comprises the following steps:
1) Adding Tetraoxysilane (TEOS) into a solvent, then adjusting the pH value to 1-5 by hydrochloric acid, and stirring the mixed solution at 15-35 ℃ for 30-120 minutes to obtain a silicon oxide precursor solution A;
2) Adding active carbon into N 2 H 4 ·H 2 In O solution, stirring and adsorbing for 10-60 min, and filtering with Buchner funnel qualitative filter paper to obtain N 2 H 4 ·H 2 O-modified activated carbon;
3) Will N 2 H 4 ·H 2 Adding the activated carbon modified by O into the silicon oxide precursor solution A in the step 1), and stirring for 30 to 120 minutes to obtain pretreated activated carbon B;
4) 1 volume TiCl under the condition of intense stirring in ice-water bath 4 Dropwise adding into pure water, regulating the pH value of the solution to 7 by using NaOH solution to obtain white precipitate, and filtering and washing the precipitate with 20 volumes of pure water for five times each time. Dispersing the precipitate in 40 volumes of pure water, and adding the solution with a weight percentage concentration of30% H 2 O 2 Stirring the solution under the ice water bath condition for reaction for 1 to 2 hours to obtain orange transparent titanium oxide precursor solution C;
5) Under the ice water bath condition, adding the pretreated activated carbon B into the titanium oxide precursor solution C, uniformly mixing, transferring the obtained paste into a baking oven with the temperature of 120-180 ℃ for drying reaction for 1-3 h to obtain SiO 2 /TiO 2 An AC composite adsorption catalyst.
Preferably, the solvent in step 1) is selected from methanol, ethanol or propanol, more preferably methanol.
Preferably, the volume ratio of Tetraoxysilane (TEOS) to solvent in step 1) is from 1:30 to 1:5, more preferably 1:10.
Preferably, the hydrochloric acid concentration in step 1) is from 0.02mol/L to 0.1mol/L, more preferably 0.055mol/L.
Preferably, said N in step 2) 2 H 4 ·H 2 The concentration of the O solution is 1.5mol/L to 4mol/L, more preferably 3mol/L.
Preferably, in step 2), the activated carbon is mixed with the N 2 H 4 ·H 2 The mass to volume ratio of the O solution was 1g:10mL.
Preferably, said N in step 3) 2 H 4 ·H 2 The mass to volume ratio of the O modified activated carbon to the silicon precursor solution A is 1g:5mL to 1g:20mL, more preferably 1g:10mL.
Preferably TiCl in step 4) 4 The volume ratio of the water to the pure water is 10:390.
Preferably, the concentration of NaOH solution in step 4) is 60g/L to 80g/L, more preferably 75g/L.
Preferably TiCl in step 4) 4 And H is 2 O 2 The volume ratio of the solutions is 10:10 to 10:30, more preferably 10:15.
Preferably, the mass to volume ratio of the pretreated activated carbon B to the titania precursor solution C in step 5) is from 10g:5mL to 10g:20mL, more preferably 10g:10mL.
Preferably, the oven temperature in step 5) is 150 ℃, and the reaction is performed for 2 hours with medium drying.
According to another aspect of the present invention, another object of the present invention is to provide a SiO 2 /TiO 2 The AC composite adsorption catalyst is prepared by the preparation method.
According to another aspect of the present invention, another object of the present invention is to provide the SiO 2 /TiO 2 Use of an AC composite adsorption catalyst for the catalytic degradation of organic pollutants.
Preferably, the organic contaminants are mainly natural organic substances in the form of carbohydrates, proteins, amino acids, fats, etc., and some other biodegradable synthetic organic substances.
Advantageous effects
Compared with the preparation method in the prior art, the invention adopts the tetraethoxysilane-hydrazine hydrate-titanium peroxide composite system to synthesize SiO 2 /TiO 2 An AC complex. Wherein N having basicity and strong reducibility 2 H 4 ·H 2 O molecules are functional SiO 2 With TiO 2 Bifunctional initiator of molecule: n (N) 2 H 4 ·H 2 The O molecule can be used for generating SiO by utilizing alkaline to drive tetraethoxysilane to hydrolyze 2 As a bonding protection layer, nano TiO can be produced by oxidation-reduction reaction of reducibility and titanium peroxide 2 Molecules are used as a photocatalytic functional layer, and the synthesized TiO 2 AC adsorbing photocatalytic material. According to the synthesis method, high-temperature sintering is not needed, so that the structure of the AC is not collapsed; on the other hand, siO is used 2 Bonding TiO as an inert barrier layer 2 A molecular protective base material; at the same time, under the condition of light excitation, nano TiO 2 The activated carbon adsorption sites can be regenerated by activating the active oxygen substances to degrade the organic molecules adsorbed on the activated carbon, so that the activated carbon has long-term stable in-situ regeneration adsorption capacity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will briefly explain the drawings needed in the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is SiO produced in example 1 2 /TiO 2 Transmitting electron microscope images at different magnifications by the AC composite adsorption catalyst;
FIG. 2 is a SiO produced in example 1 2 /TiO 2 Typical powder XRD pattern of AC composite adsorption catalyst;
FIG. 3 is a SiO produced in example 1 2 /TiO 2 Recycling test results of the AC composite adsorption catalyst on the reproducible degradation of MO.
Detailed Description
Hereinafter, the present invention will be described in detail. Before the description, it is to be understood that the terms used in this specification and the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle that the inventor is allowed to define terms appropriately for the best explanation. Accordingly, the description set forth herein is merely a preferred example for the purpose of illustration and is not intended to limit the scope of the invention, so that it should be understood that other equivalents or modifications may be made thereto without departing from the spirit and scope of the invention.
As used herein, the terms "comprising," "including," "having," "containing," or any other similar language, are intended to cover a non-exclusive inclusion, as an open-ended connection (open-ended transitional phrase). For example, a composition or article comprising a plurality of elements is not limited to only those elements listed herein, but may include other elements not explicitly listed but typically inherent to such composition or article. In addition, unless explicitly stated to the contrary, the term "or" refers to an inclusive "or" and not to an exclusive "or". For example, any one of the following conditions satisfies the condition "a or B": a is true (or present) and B is false (or absent), a is false (or absent) and B is true (or present), a and B are both true (or present). Furthermore, the terms "comprising," "including," "having," "containing," and their derivatives, as used herein, are intended to be open ended terms that have been specifically disclosed and encompass both the closed and semi-closed terms, consisting of …, and consisting essentially of ….
All features or conditions defined herein in terms of numerical ranges or percentage ranges are for brevity and convenience only. Accordingly, the description of a numerical range or percentage range should be considered to cover and specifically disclose all possible sub-ranges and individual values within the range, particularly integer values. For example, a range description of "1 to 8" should be taken as having specifically disclosed all sub-ranges such as 1 to 7, 2 to 8, 2 to 6, 3 to 6, 4 to 8, 3 to 8, etc., particularly sub-ranges defined by all integer values, and should be taken as having specifically disclosed individual values such as 1, 2, 3, 4, 5, 6, 7, 8, etc. within the range. The foregoing explanation applies to all matters of the invention throughout its entirety unless indicated otherwise, whether or not the scope is broad.
If an amount or other numerical value or parameter is expressed as a range, preferred range, or a series of upper and lower limits, then it is understood that any range, whether or not separately disclosed, from any pair of the upper or preferred value for that range and the lower or preferred value for that range is specifically disclosed herein. Furthermore, where a range of numerical values is recited herein, unless otherwise stated, the range is intended to include the endpoints thereof, and all integers and fractions within the range.
In this context, numerical values should be understood to have the accuracy of the numerical significance of the numerical values provided that the objectives of the present invention are achieved. For example, the number 40.0 is understood to cover a range from 39.50 to 40.49.
For the carbon-based adsorption catalyst, the main technical difficulty in the prior art at present is two points, namely that the traditional TiO 2 Thermochemical crystallization often requires a high temperature sintering process, but the high temperature sintering process is very liable to cause structural damage of the carbon substrate, and thus requires low levels in the carbon substrateWarm in situ synthesis of nano TiO 2 The damage to the carbon substrate in the high-temperature process is avoided as much as possible; secondly, active nano TiO 2 The active oxygen substances generated in the excitation process have an oxidizing corrosion effect on the carbon substrate, and form firm adhesion with the carbon substrate through the inert bonding layer in the invention, so that the active nano TiO caused by the corrosion of the carbon substrate is avoided 2 Falling off and decreasing the catalytic performance. In the preparation method according to the invention, N with alkalinity and reducibility is introduced 2 H 4 ·H 2 O molecules, alkalinity can promote the hydrolysis of the siloxane precursor adsorbed on the surface of the carbon substrate to form SiO 2 The layer, the reducibility can be achieved by reducing the oxidic titanium peroxide precursor directly on the SiO 2 TiO is formed on the surface of the layer 2 Thereby making TiO 2 The titanium atoms are uniformly dispersed and the integrity of the AC structure is ensured at the same time because the titanium atoms are attached to the surface of the activated carbon modified by the silicon dioxide in situ. On the one hand, the adsorption function of the activated carbon can be shown, and on the other hand, the regeneration capability of the catalyst can be improved.
SiO obtained by the preparation method of the invention 2 /TiO 2 The AC composite adsorption catalyst material fully utilizes the adsorption capacity of the activated carbon and simultaneously utilizes TiO 2 The photocatalytic decomposition of the catalyst effectively decomposes the organic pollutants adsorbed on the activated carbon, and realizes the regeneration of the adsorption capacity of the activated carbon. The catalyst can be regenerated in situ by illumination, and the service cycle of the catalyst is effectively prolonged.
In addition, unless otherwise indicated, the reagents and solvents disclosed below were purchased from beijing enoKai (innochem). TEM was measured by ultraviolet-visible spectrophotometry (Shimadzu UV 2550) by using a Japanese electron JEM-2100 transmission electron microscope, and XRD by using a D8 Focus polycrystal X-ray diffractometer from Bruker, germany.
The following examples are merely illustrative of embodiments of the present invention and are not intended to limit the invention in any way, and those skilled in the art will appreciate that modifications may be made without departing from the spirit and scope of the invention. Unless otherwise specified, reagents and equipment used in the following examples are commercially available products.
Example 1
1) Adding 1.00mL of Tetraoxysilane (TEOS) into 10.00mL of methanol solution in sequence, then adding 0.5mL of HCl solution with the concentration of 0.055mol/L, adjusting the pH value to 1, and stirring the mixed solution at 25 ℃ (room temperature) for 60 minutes to obtain silicon oxide precursor solution A;
2) 1g of activated carbon was added to 10mL of 3mol/L N 2 H 4 ·H 2 In O solution, stirring and adsorbing for 30min, and filtering with buchner funnel qualitative filter paper to obtain N 2 H 4 ·H 2 O-modified activated carbon;
3) 25 ℃ (at room temperature) 1g N 2 H 4 ·H 2 Adding the O modified activated carbon into 10mL of the silicon precursor solution A, and stirring for 60 minutes to obtain pretreated activated carbon B;
4) 10mL TiCl under intense stirring of 0 ℃ ice water bath 4 Dripping into 390mL of pure water, regulating the pH value of the solution to 7 by using 75g/L NaOH solution to obtain white precipitate, filtering and washing the precipitate with 20mL of pure water each time for five times, dispersing the precipitate into 40mL of pure water, and adding 15mL of H 2 O 2 (the mass percentage concentration is 30%) solution, stirring and reacting for 1h under the ice water bath condition at the temperature of 0 ℃ to obtain orange transparent titanium oxide precursor solution C;
5) Under the condition of ice water bath at 0 ℃,10 g of pretreated activated carbon B is added into 10mL of titanium oxide precursor solution C, the obtained paste is transferred into a baking oven at 150 ℃ to react for 2h after being uniformly mixed, and SiO is obtained 2 /TiO 2 An AC composite adsorption catalyst.
FIG. 1 is SiO 2 /TiO 2 The SiO prepared in this example can be seen from the transmission electron microscope image of FIG. 1 in which the AC composite adsorption catalyst transmits electron microscope images at different magnifications 2 /TiO 2 The AC composite adsorption catalyst is nano particles with good dispersibility. As shown in the figure, ultrafine TiO 2 The nanoparticles are uniformly dispersed on an in situ formed amorphous carbon matrix. Showing SiO 2 /TiO 2 Lattice fringes of HRTEM 0.35nm of the/AC complex are well resolved, which is comparable to tetragonal anatase TiO 2 (101) plane of (a)The intervals between the two are consistent.
FIG. 2 is SiO 2 /TiO 2 Typical powder XRD patterns of AC composite adsorption catalysts, all peaks can be matched with anatase structure TiO 2 Correspondingly, the obtained nanocrystalline particles were confirmed to be anatase structure TiO2. In addition, the active carbon and SiO2 in the catalyst are amorphous, and thus are not shown in the XRD pattern.
Example 2
Except for not using SiO 2 TiO was prepared in the same manner as in example 1 except that the modification was performed, i.e., steps 1) and 3) were not included 2 An AC composite adsorption catalyst.
Example 3
Except for not using N 2 H 4 ·H 2 SiO was prepared in the same manner as in example 1 except that O was treated 2 /TiO 2 An AC composite adsorption catalyst.
Example 4
Except that in step 4) H is not used 2 O 2 SiO was prepared in the same manner as in example 1 except that the Ti precursor was treated 2 /TiO 2 An AC composite adsorption catalyst.
Test example 1: and (3) in-situ regeneration performance test of the adsorption catalyst:
the adsorption photocatalytic test was performed at room temperature. As the target dye solution, 5mg/L of methylene blue aqueous solution was used. To 100mL of the dye solution, 25mg of the composite adsorption catalyst prepared in examples 1 to 4 was added, respectively. Adsorption was performed in the dark, while photocatalytic activity was performed under irradiation of 4 5W uv lamps with a peak wavelength of 352nm. At given time intervals (10 minutes) the concentration of methylene blue was recorded by measuring the absorbance of the solution at 664nm on an ultraviolet visible spectrophotometer (Shimadzu UV 2550) until the concentration of methylene blue in the solution dropped to zero.
In order to evaluate the in-situ regeneration performance of the catalyst, methylene blue degradation regeneration degradation experiments were performed on the composite adsorption catalysts prepared in examples 1 to 4. The adsorption and degradation process for each round was carried out in the same manner as in test example 1, and after the first round of adsorption and degradation, the composite adsorption was catalyzedThe catalyst was filtered and collected and then the recovered composite adsorption catalyst was added to the same methylene blue aqueous solution as the first cycle for the second round of photocatalytic testing. Thus, after five rounds of photocatalysis, the results of the composite adsorption catalyst prepared in example 1 are shown in fig. 3. SiO prepared in example 1 2 /TiO 2 In the first cycle, 96.6% of the methylene blue was removed. With increasing recovery time, the efficiency is slightly reduced. After 5 cycles, the catalytic efficiency remained 94.2%. It can be concluded that SiO prepared by the synthetic method according to the invention 2 /TiO 2 The adsorption catalytic ability of the AC composite adsorption catalyst is hardly lowered. Since it is difficult to avoid complete loss of catalyst material in the experiments, the decrease in catalytic capacity can be attributed to a small loss of the composite adsorption catalyst. On the other hand, tiO 2 The deposition on AC was hardly released or dissolved into the solution, indicating that the composite catalyst was very stable.
Examples 2 to 4 show the regeneration performance in Table 1, and have good adsorption effect in the first test, and the adsorption performance is basically more than 90%. However, after the second test, the performance was drastically reduced due to the inability to effectively regenerate the adsorbent using photocatalysis.
TABLE 1
Degradation rate Test 1 st time Test 2 Test 3 rd time Test 4 Test 5
Example 2 94.6％ 65.3％ 32.1％ 21.3％ 21.5％
Example 3 93.2％ 38.2％ 32.1％ 21.3％ 23.2％
Example 4 96.5％ 13.2％ 4.5％ 2.1％ 2.5％
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (22)

1. SiO that possesses normal position regeneration function 2 /TiO 2 The preparation method of the AC composite adsorption catalyst material comprises the following steps:
1) Tetraethoxysilane (TEOS) is added into a solvent, then hydrochloric acid is used for adjusting the pH value to 1-5, the mixed solution is stirred for 30-120 minutes at 15-35 ℃ to obtain a silicon oxide precursor solution A, and the solvent is selected from methanol, ethanol or propanol;
2) Adding active carbon into N 2 H 4 ·H 2 In O solution, stirring and adsorbing for 10-60 min, and filtering with Buchner funnel qualitative filter paper to obtain N 2 H 4 ·H 2 O-modified activated carbon;
3) Will N 2 H 4 ·H 2 Adding the activated carbon modified by O into the silicon oxide precursor solution A in the step 1), and stirring for 30 to 120 minutes to obtain pretreated activated carbon B;
4) 1 volume TiCl under the condition of intense stirring in ice-water bath 4 Dripping into pure water, regulating pH to 7 with NaOH solution to obtain white precipitate, filtering and washing the precipitate with 20 volumes of pure water for five times each time, dispersing the precipitate in 40 volumes of pure water, and adding 30wt% H 2 O 2 Stirring the solution under the ice water bath condition for reaction for 1 to 2 hours to obtain orange transparent titanium oxide precursor solution C;
5) Under the ice water bath condition, adding the pretreated activated carbon B into the titanium oxide precursor solution C, uniformly mixing, transferring the obtained paste into a baking oven with the temperature of 120-180 ℃ for drying reaction for 1-3 h to obtain SiO 2 /TiO 2 An AC composite adsorption catalyst.
2. The method according to claim 1, wherein the solvent in step 1) is methanol.
3. The method of claim 1, wherein the volumetric ratio of Tetraethoxysilane (TEOS) to solvent in step 1) is from 1:30 to 1:5.
4. A process according to claim 3, wherein the volumetric ratio of Tetraethoxysilane (TEOS) to solvent in step 1) is 1:10.
5. The process according to claim 1, wherein the hydrochloric acid concentration in step 1) is 0.02mol/L to 0.1mol/L.
6. The process according to claim 5, wherein the hydrochloric acid concentration in step 1) is 0.055mol/L.
7. The method according to claim 1, wherein the N in step 2) 2 H 4 ·H 2 The concentration of the O solution is 1.5mol/L to 4mol/L.
8. The method according to claim 1, wherein the N in step 2) 2 H 4 ·H 2 The concentration of the O solution was 3mol/L.
9. The method according to claim 1, wherein the activated carbon and the N in step 2) are mixed with each other 2 H 4 ·H 2 The mass to volume ratio of the O solution was 1g:10mL.
10. The method according to claim 1, wherein the N in step 3) 2 H 4 ·H 2 The mass to volume ratio of the O modified activated carbon to the silicon precursor solution A is 1g:5mL to 1g:20mL.
11. The method according to claim 10, wherein the N in step 3) 2 H 4 ·H 2 The mass to volume ratio of the O modified activated carbon to the silicon precursor solution A is 1g to 10mL.
12. The process according to claim 1, wherein TiCl is used in step 4) 4 The volume ratio of the water to the pure water is 10:390.
13. The process according to claim 1, wherein the concentration of NaOH solution in step 4) is 60g/L to 80g/L.
14. The method of claim 13, wherein the concentration of NaOH solution in step 4) is 75g/L.
15. The process according to claim 1, wherein TiCl is used in step 4) 4 And H is 2 O 2 The volume ratio of the solution is 10:10 to 10:30.
16. The process according to claim 15, wherein TiCl is used in step 4) 4 And H is 2 O 2 The volume ratio of the solution is 10:15.
17. The method of claim 1, wherein the mass to volume ratio of the pretreated activated carbon B to the titania precursor solution C in step 5) is 10g:5ml to 10g:20ml.
18. The method of claim 17, wherein the mass to volume ratio of the pretreated activated carbon B to the titania precursor solution C in step 5) is 10g to 10ml.
19. The method according to claim 1, wherein the oven temperature in step 5) is 150 ℃ and the drying reaction is carried out for 2 hours.
20. The preparation method according to claim 1, characterized in that the method is performed as follows:
1) Sequentially adding 1.00mL of tetraethoxysilane into 10.00mL of methanol solution, then adding 0.5mL of HCl solution with the concentration of 0.055mol/L, adjusting the pH value to 1, and stirring the mixed solution at room temperature for 60 minutes to obtain silicon oxide precursor solution A;
2) 1g of activated carbon was added to 10mL of 3mol/L N 2 H 4 ·H 2 In O solution, stirring and adsorbing for 30min, and filtering with buchner funnel qualitative filter paper to obtain N 2 H 4 ·H 2 O repairDecorative activated carbon;
3) 1g N at room temperature 2 H 4 ·H 2 Adding the O modified activated carbon into 10mL of the silicon precursor solution A, and stirring for 60 minutes to obtain pretreated activated carbon B;
4) 10mL TiCl under intense stirring of 0 ℃ ice water bath 4 Dripping into 390mL of pure water, regulating the pH value of the solution to 7 by using 75g/L NaOH solution to obtain white precipitate, filtering and washing the precipitate with 20mL of pure water for five times each time, dispersing the precipitate into 40mL of pure water, and adding 15mL of H with the mass percentage concentration of 30% 2 O 2 Stirring the solution for reaction for 1h under the condition of ice water bath at the temperature of 0 ℃ to obtain orange transparent titanium oxide precursor solution C;
5) Under the condition of ice water bath at 0 ℃,10 g of pretreated activated carbon B is added into 10mL of titanium oxide precursor solution C, the obtained paste is transferred into a baking oven at 150 ℃ to react for 2h after being uniformly mixed, and SiO is obtained 2 /TiO 2 An AC composite adsorption catalyst.
21. SiO (silicon dioxide) 2 /TiO 2 Composite adsorption catalyst of/AC, said SiO 2 /TiO 2 An AC composite adsorption catalyst prepared according to the preparation method of any one of claims 1 to 20.
22. SiO according to claim 21 2 /TiO 2 Use of an AC composite adsorption catalyst for the catalytic degradation of organic pollutants.
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