CN109987586B - Method for adsorbing hydrogen peroxide generated by photolysis of water system - Google Patents

Abstract

The invention discloses a method for adsorbing hydrogen peroxide generated by a photolysis water system, wherein the photolysis water system comprises water, a photolysis catalyst, a light source and a stirrer, the water is subjected to photolysis under the irradiation condition of the light source and the catalytic action of the photolysis catalyst to generate hydrogen peroxide, an adsorbing material for adsorbing the hydrogen peroxide is arranged on the outer side of the photolysis water system, the adsorbing material and the photolysis water system are arranged in the same container, and the adsorbing material and the photolysis water system are separated by a filter membrane. The method can stably adsorb and enrich hydrogen peroxide in the process of photolyzing water.

Description

A kind of method for adsorbing hydrogen peroxide generated by photolysis water system

technical field

The invention relates to the technical field of photolyzed water and hydrogen peroxide, in particular to a method for adsorbing hydrogen peroxide generated by a photolyzed water system.

Background technique

The English name of hydrogen peroxide is Hydrogen Peroxide, and its chemical formula is H ₂ O ₂ . It can be mixed with water in any proportion. The mixed aqueous solution is a colorless and transparent liquid, commonly known as hydrogen peroxide. Since the hydrogen and oxygen atoms in it can covalently form a non-polar HOOH structure, the oxygen in the peroxy radical [-OO-] ^2- has a valence of -1, which can easily reduce the valence of electrons to -2, and can also increase the valence of electrons. It is 0 valence, so the chemical properties of hydrogen peroxide are very active, with strong oxidizing and weak reducing properties. Whether it is oxidizing or reducing, the final products H ₂ O and O ₂ that hydrogen peroxide participates in the reaction are inherent substances of nature and will not cause secondary pollution to the environment, so they are widely used in the chemical industry. However, hydrogen peroxide is very unstable and will gradually decompose into H ₂ O and O ₂ at room temperature. If it is heated or exposed to light, it will decompose faster, and it is easy to fail, so it is usually necessary to store it in the dark.

The methods for producing hydrogen peroxide in the prior art include electrolysis method, isopropanol oxidation method, oxygen cathode reduction method, hydrogen-oxygen direct synthesis method, and anthraquinone method. Among them, the anthraquinone method is relatively mature and has become the main method for producing hydrogen peroxide in the world. However, the above-mentioned production processes all require large and complex production equipment, such as electrolytic cells and reaction towers, and in order to improve the concentration and purity of hydrogen peroxide, the reaction product needs to be separated multiple times through complex extraction devices to obtain purer hydrogen peroxide.

Photolysis of water will also produce hydrogen peroxide. Linsebigler AL et.al. reported in Chem.Rev. 1995, 95:735～760 that using TiO ₂ as a photocatalyst, the photolysis water system will produce OH at 300K Free radicals are then coupled to generate hydrogen peroxide, that is, ■OH+■OH→H ₂ O ₂ . However, since the main substance in the photolysis water system is water, the concentration of hydrogen peroxide is very low, and the hydrogen peroxide will decompose quickly during the photolysis process, so the prior art basically does not use hydrogen peroxide in the photolysis water system. Most of them use the oxidative properties of OH radicals, or use the O ₂ and H ₂ generated by the decomposition of water and hydrogen peroxide. To sum up, it can be seen that the amount of hydrogen peroxide in the photolyzed water system is small and easy to decompose, and the prior art has not considered and cannot achieve the adsorption and utilization of hydrogen peroxide in the photolyzed water system.

Those skilled in the chemical industry know that adsorption and catalysis are two distinct functions. Adsorption is to selectively accumulate and enrich one or several components in the fluid by using a porous solid material with a large surface area, so as to make the mixture components. Separation, the porous solid material is called adsorbent, and the accumulated and enriched components are called adsorbate or adsorbate; and catalysis is to change the activation energy of the reactant through the catalyst, thereby changing the rate of chemical reaction , the quality and chemical properties of the catalyst remained unchanged before and after the reaction. For hydrogen peroxide, adsorption in the prior art is usually to purify hydrogen peroxide and adsorb other impurities. For example, in CN107556426A, fluorine-containing acrylic resin is used to adsorb organic impurities and inorganic salt impurities in hydrogen peroxide products. Since hydrogen peroxide can be decomposed in the photolysis water system to generate hydroxyl radicals, resulting in strong oxidation, for example, the catalyst disclosed in paragraph [0009] of the CN107522256A specification is an adsorbent carrier with adsorption properties and a photocatalyst with photocatalytic properties. The composition, wherein the adsorbent carrier with adsorption performance is activated carbon or molecular sieve, the photocatalyst is TiO ₂ or loaded TiO ₂ , and hydrogen peroxide is added to improve the efficiency of photodegradation. The above-mentioned adsorbent carrier, photocatalyst and hydrogen peroxide The common purpose of the water is Degrade organic pollutants in sewage and purify water quality. It can be seen from this that the starting point of the prior art related to hydrogen peroxide involving adsorption and catalysis is to remove impurities other than hydrogen peroxide. No doubt, such a workload will be very large, and all impurities cannot be removed.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the above shortcomings of the prior art: to provide a method for adsorbing hydrogen peroxide generated by a photolysis water system, which can stably adsorb and enrich the hydrogen peroxide in the process of photolysis water.

The technical solution of the present invention is as follows: a method for adsorbing hydrogen peroxide generated by a photolysis water system, the photolysis water system includes water, a photolysis catalyst, a light source and a stirrer, the irradiation conditions of the water in the light source and the catalytic action of the photolysis catalyst Photolysis occurs under the photolysis system to generate hydrogen peroxide. An adsorbent material for adsorbing hydrogen peroxide is arranged on the outside of the photolysis water system. The adsorbent material and the photolysis water system are placed in the same container and separated by a filter membrane.

The specific operation process of the above method is as follows:

1) The container is separated into two parts with a filter membrane, one part is a photolysis water system, and the other part is added with an adsorbent material for adsorbing hydrogen peroxide;

2) Turn on the light source and the agitator, so that the water is photolyzed under the irradiation conditions of the light source and the catalytic action of the photolysis catalyst to generate hydrogen peroxide;

3) The hydrogen peroxide passes through the filter membrane and is adsorbed onto the adsorbent material. After the adsorbent material adsorbs a predetermined amount of hydrogen peroxide, the adsorbent material adsorbed with the hydrogen peroxide is taken out to separate the hydrogen peroxide.

Compared with the prior art, the method for adsorbing the hydrogen peroxide generated by the photolysis water system of the present invention has the following significant advantages and beneficial effects:

The function of the adsorbent material of the present invention is to absorb the hydrogen peroxide produced in the photolysis water system, and the specific mechanism is that water photolysis generates OH radicals, which are then coupled to generate hydrogen peroxide. Hydrogen peroxide can pass through the filter membrane in water and be adsorbed on the solid adsorption material, and the hydrogen peroxide is stably attached to the surface of the adsorption material. Moreover, since the photolysis catalyst and the adsorption material are both solid materials and are located on both sides of the filter membrane, they can block the light from irradiating the hydrogen peroxide, so that the decomposition of the hydrogen peroxide is significantly reduced. In conclusion, the above-mentioned adsorption materials can stably adsorb and enrich the hydrogen peroxide generated during the process of photolysis of water, thereby improving the efficiency of the photolysis of water reaction.

Compared with the existing hydrogen peroxide production technology, this method does not require large and complex production equipment such as electrolytic cells, reaction towers, etc., but only needs a simple container, and the container is separated by a filter membrane for accommodating adsorption materials and The two parts of the photolyzed water system, and then the light source and the agitator are turned on, the adsorbent can absorb hydrogen peroxide with higher concentration and purity in the process of photolyzed water, so the equipment required for this method is simple and easy to operate. Compared with the existing photo-splitting technology, this method creatively adsorbs and collects the hydrogen peroxide generated during the photo-splitting process, so that the original small amount of hydrogen peroxide is concentrated on the adsorbent material and stably attached to the adsorbent material. It is easy to decompose and truly realizes the recycling of hydrogen peroxide.

The technology of the invention fills the gap in the field of hydrogen peroxide using photolysis water technology, adsorbs and enriches the hydrogen peroxide that cannot be used by the photolysis water system in the industry, and has good application prospects in hydrogen peroxide recovery, green oxidation, photocatalysis technology, etc. .

Since the adsorption material itself does not have the effect of photolysis and catalysis, if it is not isolated from the photolysis water system, the adsorption material will hinder the catalytic effect of the photolysis catalyst, and the adsorbed hydrogen peroxide will be quickly decomposed under light after adsorption, so it needs to be filtered. The membrane separates the adsorbent material from the photolysis water system to ensure that the photolysis water reaction proceeds normally and effectively and improves the adsorption efficiency.

Preferably, the adsorption material is a titanium-silicon molecular sieve with a Si-O-Ti bond skeleton structure, a vanadium-silicon molecular sieve with a Si-O-V bond skeleton structure, a chromium-silicon molecular sieve with a Si-O-Cr bond skeleton structure, or both There are silicon molecular sieves with two or three elements of Ti, V, and Cr. The above-mentioned adsorbents are all molecular sieves with skeleton structure including a variety of elements, and all have the performance of adsorbing hydrogen peroxide. Among them, Ti, V, Cr three elements have the performance of absorbing and stabilizing hydrogen peroxide, while silicon oxide plays the role of forming molecular sieve framework. For example, the titanium-silicon molecular sieve formed by the uniform distribution of titanium atoms in the framework of titanium-silicon molecular sieve has excellent adsorption performance, and the active site for adsorbing hydrogen peroxide is four-coordinated Ti in the framework structure.

Further preferably, the Ti content in the titanium-silicon molecular sieve is 1-5 wt%, the V content in the vanadium-silicon molecular sieve is 1-5 wt%, the Cr content in the chromium-silicon molecular sieve is 1-5 wt%, and the silicon molecular sieve The total content of two or three elements in Ti, V and Cr is 1-5wt%. For the convenience of expression, the present invention refers to the three elements of Ti, V and Cr as "hydrogen peroxide adsorption elements". The content of hydrogen peroxide adsorption elements in each adsorption material is 1-5 wt%. This is because the adsorption efficiency is reduced if the content is too low, and the preparation technology is difficult if the content is too high. Therefore, the titanium-silicon molecular sieve and vanadium-silicon molecular sieve with the above content , chrome-silicon molecular sieve or silicon molecular sieve has better adsorption performance, and the preparation is more convenient and simple.

More preferably, the titanium-silicon molecular sieve is any one of TS-1, TS-2, and HTS. The above-mentioned titanium-silicon molecular sieve has better adsorption performance, and can stably adsorb hydrogen peroxide to the surface more quickly and efficiently.

Preferably, the container is provided with an adsorption aid for enhancing the adsorption of hydrogen peroxide. Adsorption aids refer to substances that can form hydrogen bonds with hydrogen peroxide and adsorption materials and are not easily decomposed. Since the adsorption aid is added in the container, the amount of the adsorption material can be appropriately reduced and the cost can be reduced.

Further preferably, the adsorption aids are 2,2,6,6-tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-oximo-piperidine, phosphate, methanol , any one of ethanol. Among them, the phosphate is preferably potassium dihydrogen phosphate KH ₂ PO ₄ or sodium dihydrogen phosphate NaH ₂ PO ₄ . All the above-mentioned adsorption aids can enhance the adsorption effect, and none of the adsorption aids are easily decomposed and can function for a long time.

More preferably, the amount of 2,2,6,6-tetramethyl-4-piperidinone accounts for 0.5-2% of the molar content of Ti in the adsorbent material, and the amount of phosphate accounts for 0.5-2% of the weight of the solution. The dosage of adsorption aids varies according to different varieties. If the dosage is too small, the adsorption increase will not increase much, and the excessive adsorption effect will increase less.

Also further preferably, the filter membrane is a sand filter membrane that blocks the passage of adsorbent materials and photolysis catalysts while allowing free passage of water, hydrogen peroxide and adsorption aids. With the above-mentioned sand core filter membrane, the efficiency of adsorbing hydrogen peroxide is higher, and light can be further blocked from irradiating the hydrogen peroxide through the filter membrane. Since hydrogen peroxide and adsorption aids are both miscible with water, and the filter membrane allows water, hydrogen peroxide, and adsorption aids to pass freely, and at the same time blocks the passage of adsorption materials and photolysis catalysts, the photolysis water system is separated on one side of the adsorption material by the filter membrane. There are free-moving water, hydrogen peroxide, and adsorption aids in it; however, due to the adsorption properties of the adsorption material, hydrogen peroxide and adsorption aids can move more and more quickly to the side of the adsorption material, so the efficiency of adsorbing hydrogen peroxide is higher.

Preferably, the filter membrane is arranged in a horizontal direction and separates the container into an upper layer and a lower layer, the photolysis water system is located in the upper layer of the container, and the adsorption material is located in the lower layer of the container. That is to say, the filter membrane separates the adsorption material and the photolysis water system into two layers, the upper and lower layers, so that the hydrogen peroxide can be attached to the surface of the adsorption material in the lower layer of the container faster by its own weight, and the adsorption rate is improved.

Preferably, after the adsorbent material adsorbs a predetermined amount of hydrogen peroxide, the adsorbent material adsorbed with hydrogen peroxide is taken out to separate the hydrogen peroxide. The adsorbent material adsorbed with hydrogen peroxide can be used for recovery of hydrogen peroxide by hydrolysis absorption or for some green oxidation reactions. The treated adsorbent material can continue to be put into the container to play an adsorbing role after being treated.

Further preferably, the separation method is centrifugal separation method or filtration method. The above two methods can achieve rapid solid-liquid separation, and the centrifugal separation method is faster and less hydrogen peroxide is decomposed. Different centrifugation rates and times can be selected according to the properties of the adsorbent material. The principle is that the shorter the time, the better the better separation of solid and liquid. The filtration method is used for solid-liquid separation to avoid the decomposition of hydrogen peroxide during the separation process.

Preferably, the photolysis temperature is 10˜50° C., and the photolysis time is 10˜20 min. A large number of experimental studies have shown that the adsorption efficiency of hydrogen peroxide is related to the photolysis temperature. If the temperature is too low, the energy consumption will increase; if the temperature is too high, the decomposition of hydrogen peroxide will increase significantly and the adsorption efficiency will decrease. less, the adsorption efficiency is high. On the other hand, the adsorption capacity of hydrogen peroxide is related to the photolysis time. If the time is too short, the adsorption capacity will be too low; if the time is too long, the adsorption capacity will not increase after the adsorption is saturated; if the photolysis time is controlled within the above range, the adsorption capacity will be high.

Preferably, the light source is any one of a tungsten lamp, a quartz lamp, a mercury lamp, a hydrogen lamp, a xenon lamp, a helium lamp, and a krypton lamp.

Description of drawings

FIG. 1 is a schematic diagram of the structure of the device for generating hydrogen peroxide by the adsorption photolysis water system of the present invention.

As shown in the picture 1, container, 2, filter membrane, 3, light source, 4, stirrer, 5, upper layer, 6, lower layer, 7, feeding outlet, 8, coolant inlet, 9, coolant outlet, 10 , Adsorbent material.

Detailed ways

The present invention will be described in further detail below with specific examples, but the present invention is not limited to the following specific examples.

A variety of raw materials are involved in the present invention, including 2,2,6,6-tetramethyl-4-piperidone, 2,2,6,6-tetramethyl-4-oximino-piperidine, phosphate, Methanol, ethanol, TiO ₂ , ZnO, these raw materials can be purchased from the market. Titanium-silicon molecular sieves such as TS-1, TS-2, and HTS can be prepared according to literature methods. Other adsorption materials include titanium-silicon molecular sieves with Si-O-Ti bond skeleton structure, vanadium-silicon molecular sieves with Si-OV bond skeleton structure, and Chromium-silicon molecular sieves with Si-O-Cr bond skeleton structure, or silicon molecular sieves with two or three elements of Ti, V, and Cr at the same time can also be prepared according to literature methods. For example, preparation of vanadium-silicon molecular sieves: Yuan Zhiqing et al., Chinese Journal of Chemical Engineering, 2002, 16(2): 145-148; Preparation of titanium-silicon molecular sieve: Yuan Ye et al., Journal of Artificial Crystallography, 2017, (5): 855-860;

In the present invention, multiple parameters, such as weight percentage, temperature, time, and units (such as wt%, °C, min) are uniformly marked after the upper limit, for example, 1-5 wt%, 10-50 °C, 10-20 min. Of course, the upper limit value and the lower limit value can also be marked with units, such as 1wt% to 5wt%, 10°C to 50°C, and 10min to 20min. These two parameter ranges can be expressed in any manner. In the embodiment, the upper limit and lower limit of the parameter and the middle value are taken, and the numerical value will be followed by a unit. Controlling the photolysis temperature within a certain range means that the photolysis reaction can proceed normally within this range, and there is no need to deliberately limit it to a certain temperature value.

The embodiments provided below are not intended to limit the scope of the present invention, and the described steps are not intended to limit the order of their execution. Those skilled in the art can make obvious improvements to the present invention in combination with the existing common knowledge, which also fall within the protection scope of the present invention.

As shown in FIG. 1 , a device for adsorbing hydrogen peroxide generated by a photolysis water system includes a container 1 . A filter membrane 2 is arranged in the container 1 along the horizontal direction. The filter membrane 2 separates the container 1 into an upper layer 5 and a lower layer 6 . The upper layer 5 is a photolysis water system. The photolysis water system includes water, a photolysis catalyst, a light source 3, and a stirrer 4. The water undergoes photolysis under the irradiation conditions of the light source 3 and the catalytic action of the photolysis catalyst to generate hydrogen peroxide. The lower layer 6 is provided with an adsorption material 10 for adsorbing hydrogen peroxide and an adsorption aid for enhancing the adsorption of hydrogen peroxide. The outer side of the container 1 is provided with a cooling circulation system for maintaining the temperature, and the cooling circulation system flows with cooling liquid. The outer side of the lower layer 6 of the container is provided with a feeding and discharging port 7 for adding or taking out the adsorbent material.

A method of adopting the above-mentioned device to absorb the hydrogen peroxide generated by the photolysis water system, the specific operation process is as follows:

1) the container 1 is separated into the upper layer 5 and the lower layer 6 with the sand core filter membrane 2, the upper layer 5 is a photolysis water system, and the lower layer 6 is provided with the titanium-silicon molecular sieve HTS for adsorbing hydrogen peroxide, and the container 1 is added with for enhancing the hydrogen peroxide adsorption. The adsorption aid 2,2,6,6-tetramethyl-4-piperidone;

2) Turn on the light source and the agitator, so that the water is photolyzed under the irradiation conditions of the light source and the catalytic action of the photolysis catalyst to generate hydrogen peroxide;

3) The hydrogen peroxide passes through the filter membrane and is adsorbed on the adsorbent material. After the adsorbent material adsorbs a predetermined amount of hydrogen peroxide, the adsorbent material adsorbed with hydrogen peroxide is taken out, and the adsorbent adsorbed with hydrogen peroxide is separated by centrifugation.

A filter membrane 2 is arranged in the above-mentioned container 1 along the horizontal direction. The container 1 is divided into an upper layer 5 and a lower layer 6 with the filter membrane 2 as a boundary. Of course, the sand core filter membrane 2 can also be arranged in the vertical direction in the container 1, so that the sand core filter membrane 2 divides the container 1 into two parts, one part is the photolysis water system, and the other part is filled with adsorption materials and adsorption aids. Since the stirrer 4 arranged in the photolysis water system can strengthen the diffusion, the hydrogen peroxide generated by the water photolysis can also be adsorbed on the adsorbent material through the filter membrane 2 arranged in the vertical direction.

The above-mentioned titanium-silicon molecular sieve HTS is an adsorption material with a Si-O-Ti bond skeleton structure. In addition to HTS, titanium-silicon molecular sieves can also be selected from TS-1, TS-2, Ti-Beta, etc. The Ti content in the titanium-silicon molecular sieve is 1- 5wt%. In addition to the titanium-silicon molecular sieve with Si-O-Ti bond skeleton structure, the adsorption material can also choose vanadium-silicon molecular sieve with Si-O-V bond skeleton structure, chromium-silicon molecular sieve with Si-O-Cr bond skeleton structure, or the presence of Ti , V, Cr with two or three elements of silicon molecular sieve. The V content in the vanadium-silicon molecular sieve is 1-5 wt %, the Cr content in the chromium-silicon molecular sieve is 1-5 wt %, and the total content of two or three elements of Ti, V and Cr in the silicon molecular sieve is 1 ~5 wt%.

The above-mentioned 2,2,6,6-tetramethyl-4-piperidone is an adsorption aid for enhancing the adsorption of hydrogen peroxide, and the adsorption aid can also be selected from 2,6,6-tetramethyl-4-oximino -piperidine, phosphate, methanol or ethanol, etc.

The above-mentioned sand core filter membrane can block the passage of adsorption materials and photolysis catalysts, and at the same time allow water, hydrogen peroxide, and adsorption aids to pass freely.

The above centrifugal separation method can quickly separate hydrogen peroxide, and can also be separated by a filtration method.

In the above-mentioned photolysis water system, water is photolyzed, the photolysis temperature is 10～50℃, the photolysis time is 10～20min, and the light source is a tungsten lamp, a quartz lamp, a mercury lamp, a hydrogen lamp, a xenon lamp, a helium lamp, and a krypton lamp. any of the . The photolysis catalyst is a chemical reagent that improves the rate of the photolysis water reaction, such as TiO ₂ , ZnO or a supported modified photolysis water catalyst. The amount of the photolysis catalyst depends on the variety of the catalyst. If the amount is too small, the adsorption time is long; Too much volume and high cost. Choose the appropriate amount to shorten the adsorption time and reduce the cost.

After using the adsorption material to adsorb the hydrogen peroxide in the liquid phase, since the adsorption material is difficult to completely dehydrate, the iodometric method is used to measure the amount of hydrogen peroxide on the adsorption material and the liquid phase. The specific method is as follows: the sample taken out in step 3) is centrifuged into The liquid phase and the adsorbent phase with higher solid content are weighed to obtain m(l) and m(s) respectively; then the liquid phase and adsorbent phase are titrated respectively to measure the amount of adsorbed hydrogen peroxide substance n(l) and n(s). In addition, according to the amount m ₀ of adsorbent material added, calculate the liquid phase mass m′(l) in the adsorbent material phase, that is, m′(l)=m(s)﹣m ₀ ; due to the content of H ₂ O ₂ in liquid phase the same, there are:

where:

n(HPAM)——the amount of hydrogen peroxide adsorbed by the adsorbent, in mmol;

n(s)——the amount of hydrogen peroxide contained in the adsorbent phase, in mmol;

n(l)——the amount of hydrogen peroxide contained in the liquid phase, in mmol;

m(l)——mass of liquid phase, in g;

n'(l)——the amount of hydrogen peroxide contained in the liquid phase contained in the adsorption material phase, in mmol;

m'(l)—the mass of the liquid phase contained in the adsorbent phase, in g.

Example 1

A method for adsorbing hydrogen peroxide generated by a photolysis water system. A sand core filter membrane is arranged in the container along the horizontal direction. The sand core filter membrane separates the container into an upper layer and a lower layer. The upper layer has a volume of 250 mL and the lower layer is 100 mL. Add adsorption material into the lower layer from the feeding and discharging port. The above-mentioned adsorption material is titanium-silicon molecular sieve HTS30g (containing 13 mmol of Ti) with a Ti content of 2.1 wt% dispersed with 50 mL of deionized water, and a stirring magnet is placed in the lower layer. The upper layer was equipped with a thermometer and a stirrer, 200 mL of deionized water and 0.10 g of nano-ZnO were added to the upper layer, and a high-pressure mercury lamp preheated for 1 h was placed to photolyze the water. At the same time, the upper and lower layers are turned on to stir, and the cooling liquid is passed through the container. The photolysis was stopped for 10 min, and the photolysis temperature was 25-30° C. The adsorbent material adsorbed with hydrogen peroxide was taken out and centrifuged. The amount of hydrogen peroxide adsorbed in the adsorbent was measured by iodometric method, and the result was: adsorbed hydrogen peroxide was 3.8 mmol.

The examples in Table 1 below are the same as those in Example 1 except that the adsorbent material and the dosage are different.

Table 1

The examples in Table 2 below are the same as those in Example 1 except that the adsorption aid is added.

Table 2

Example 20

The photolysis temperature was controlled at 10-15° C., and the others were the same as those in Example 1, and the result was: adsorbed hydrogen peroxide 4.1 mmol.

Example 21

The photolysis temperature was controlled at 45-50° C., and the others were the same as those in Example 1, and the result was: adsorbed hydrogen peroxide 2.8 mmol.

Example 22

The photolysis time was controlled at 20min, and the others were the same as in Example 1, and the result was: adsorbed hydrogen peroxide 4.0mmol.

The experimental data show that with titanium-silicon molecular sieve as adsorbent, the adsorbed hydrogen peroxide decomposes only about 10% in 4 days at 15℃, and decomposes more than 50% in 2 days at 25℃. However, if there is no adsorbent system, the hydrogen peroxide will decompose as soon as the concentration is high, and it is also easy to decompose under light.

The above are only characteristic implementation examples of the present invention, and do not constitute any limitation to the protection scope of the present invention. All technical solutions formed by equivalent exchange or equivalent replacement fall within the protection scope of the present invention.

Claims (5)

1. a method for adsorbing hydrogen peroxide generated by a photolysis water system, the photolysis water system comprises water, a photolysis catalyst, a light source and a stirrer, and water photolysis occurs under the irradiation conditions of the light source and the catalysis of the photolysis catalyst, generating Hydrogen peroxide, characterized in that an adsorption material for adsorbing hydrogen peroxide is arranged on the outside of the photolysis water system, and the adsorption material and the photolysis water system are placed in the same container and separated by a filter membrane; The adsorption material is a titanium-silicon molecular sieve with a Si-O-Ti bond skeleton structure, a vanadium-silicon molecular sieve with a Si-O-V bond skeleton structure, a chromium-silicon molecular sieve with a Si-O-Cr bond skeleton structure, or the presence of Ti, Silicon molecular sieve with two or three elements in V and Cr; An adsorption aid for enhancing the adsorption of hydrogen peroxide is added in the container; The filter membrane is arranged along the horizontal direction and separates the container into an upper layer and a lower layer, the photolysis water system is located in the upper layer of the container, and the adsorption material is located in the lower layer of the container; After the adsorbent material adsorbs a predetermined amount of hydrogen peroxide, the adsorbent material adsorbed with hydrogen peroxide is taken out, and the hydrogen peroxide is separated. 2 . The method for absorbing hydrogen peroxide generated by a photolysis water system according to claim 1 , wherein the Ti content in the titanium-silicon molecular sieve is 1 to 5 wt %, and the V content in the vanadium-silicon molecular sieve is 1～5 wt %. 3 . 5wt%, the Cr content in the chromium-silicon molecular sieve is 1-5wt%, and the total content of two or three elements of Ti, V and Cr in the silicon molecular sieve is 1-5wt%. 3. the method for adsorbing the hydrogen peroxide generated by photolysis water system according to claim 1, is characterized in that, described adsorption aid is 2,2,6,6-tetramethyl-4-piperidone, 2 , Any one of 2,6,6-tetramethyl-4-oximino-piperidine, phosphate, methanol and ethanol. 4. the method for adsorbing the hydrogen peroxide that is generated by photolysis water system according to claim 1, is characterized in that, described filter membrane is for blocking adsorption material, photolysis catalyst to pass through, and allows water, hydrogen peroxide, adsorption aid to pass through freely simultaneously sand filter membrane. 5 . The method for adsorbing hydrogen peroxide generated by a photolysis water system according to claim 1 , wherein the method for separating the adsorbent material adsorbed with hydrogen peroxide is a centrifugal separation method or a filtration method. 6 .

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