Self-cleaning hydrogen production material, preparation method and application thereof

Abstract

The present application relates to hydrogen production material technical field, especially to a kind of self-purification hydrogen production material, its preparation method and application.Self-purification hydrogen production material is composed of the following mass parts of raw materials: magnesium hydride 1-5 parts, attapulgite powder 80-90 parts and chitosan 10-15 parts.The present application also discloses the preparation method of self-purification hydrogen production material and its application in the preparation of hydrogen-rich water.The self-purification hydrogen production material of the present application uses magnesium hydride as hydrolysis hydrogen source, cooperates with the flocculation of attapulgite powder and chitosan, which can reduce the generation of magnesium hydroxide gel in water body, prevent water body from being contaminated by third-party impurities, has better self-purification effect, no toxic and odor gas is produced, which can ensure the quality of water body, and also can purify water body, the hydrogen produced by hydrolysis reaction improves water quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen production materials, in particular to a self-purification hydrogen production material, a preparation method and application thereof. BACKGROUND

[0002] With the progress of science and technology and the development of modern medicine, it is gradually realized that active oxygen is an important source of human aging and disease, and hydrogen can reduce active oxygen. The human body can eliminate harmful active oxygen by supplementing hydrogen, and hydrogen-rich water and hydrogen inhalation products have emerged as the times require.

[0003] At present, the conventional hydrogen production methods mainly include water-gas hydrogen production, natural gas hydrogen production and water electrolysis hydrogen production, which are mainly used for industrial production of hydrogen, especially for the production of high-purity hydrogen. Chinese patents CN110526375A, CN216494877U, CN114314995A, CN208625179U and CN201559854U are all based on water electrolysis hydrogen production, which has the problems of complex structure, high energy consumption, small and unstable hydrogen production, and high cost. Moreover, the biggest harm of water electrolysis hydrogen production is that electrolysis produces dissolved chlorine and ozone, which has an odor and causes harm to the human body, and is not suitable for hydrogen-rich water and hydrogen inhalation.

[0004] Magnesium hydride is a new hydrogen storage material developed in recent years, which can realize stable and long-acting hydrogen release through hydrolysis reaction. Chinese patents CN110002398A and CN217051646U disclose the direct or indirect use of magnesium hydride as a raw material for hydrogen production, but since magnesium hydride needs to be hydrolyzed in water to produce hydrogen, a large amount of magnesium hydroxide gel and Mg(OH)2 will be generated. 2+ - Thus, the pH value of the water and the third-party impurity components are greatly changed, and sewage is generated, which brings inconvenience for subsequent treatment.

[0005] Therefore, it is necessary to provide a self-purification hydrogen production material to solve the above problems. SUMMARY

[0006] To solve the above technical problems, the present application provides a self-purification hydrogen production material, a preparation method and application thereof. The self-purification hydrogen production material of the present application uses magnesium hydride as a hydrolysis hydrogen source, and cooperates with the flocculation of attapulgite powder and chitosan to reduce the generation of magnesium hydroxide gel in the water body, prevent the water body from being polluted by third-party impurities, have a better self-purification effect, no toxic and odor gas is generated, the quality of the water body can be guaranteed, and the water body can also be purified, the hydrogen produced by the hydrolysis reaction improves the quality of the water body.

[0007] The purpose of the present application is to provide a self-purification hydrogen production material.

[0008] ​Another object of the present application is to provide a preparation method of the self-purification hydrogen production material.

[0009] Another object of the present application is to provide an application of the self-purification hydrogen production material in the preparation of hydrogen-rich water.

[0010] The self-purification hydrogen production material provided by the embodiment of the present application is composed of the following raw materials in mass fraction:

[0011] 1-5 parts of magnesium hydride, 80-90 parts of attapulgite powder and 10-15 parts of chitosan.

[0012] In the self-purification hydrogen production material of the present application, hydrogen is produced by the hydrolysis reaction of magnesium hydride, and magnesium hydroxide gel is produced at the same time. The attapulgite powder has a negative charge, and can fully adsorb the magnesium ions produced by the reaction of magnesium hydride and the harmful metal ions in the water body. The chitosan acts as a cationic flocculant, and can neutralize the hydroxide ions produced by the reaction, and flocculate and precipitate the magnesium hydroxide gel.

[0013] The particle size of the magnesium hydride is 10-50 nm, and the particle size of the attapulgite powder is 50-100 nm.

[0014] The attapulgite powder is prepared by calcining attapulgite at 480-520℃ for 2-3h.

[0015] The chitosan is water-soluble chitosan.

[0016] The self-purification hydrogen production material provided by the embodiment of the present application is composed of the following raw materials in mass fraction:

[0017] 1-2 parts of magnesium hydride, 80-90 parts of attapulgite powder and 10-15 parts of chitosan.

[0018] The self-purification hydrogen production material provided by the embodiment of the present application is composed of the following raw materials in mass fraction:

[0019] 2-3 parts of magnesium hydride, 80-90 parts of attapulgite powder and 10-15 parts of chitosan.

[0020] The self-purification hydrogen production material provided by the embodiment of the present application is composed of the following raw materials in mass fraction:

[0021] 3-5 parts of magnesium hydride, 80-90 parts of attapulgite powder and 10-15 parts of chitosan.

[0022] The method for preparing the self-purifying hydrogen production material according to a specific embodiment of the present invention includes the following steps:

[0023] Weigh 80-90 parts by weight of attapulgite powder and 10-15 parts by weight of chitosan and mix them to obtain a mixture.

[0024] Adding 1-5 parts by weight of magnesium hydride to the mixture and homogenizing it yields a self-purifying hydrogen production material.

[0025] According to the preparation method of the self-purifying hydrogen production material provided by the specific embodiment of the present invention, the mixing time of the attapulgite powder and the chitosan is 25-35 min; the mixing time of the mixture and the magnesium hydride is 50-120 min.

[0026] The application of the self-purifying hydrogen production material provided by the present invention in the preparation of hydrogen-rich water.

[0027] Preferably, the application refers to packaging the self-purifying hydrogen production material in a filter bag, filling the filter bag with a certain amount of the self-purifying hydrogen production material to obtain a hydrogen production bag, placing the hydrogen production bag in a water body, reacting to produce hydrogen gas, and the water containing dissolved hydrogen gas is hydrogen-rich water.

[0028] Preferably, the filter bag has a pore size of 10-100 nm. Using a filter bag with this pore size allows the self-purifying hydrogen-generating material to come into contact with water and undergo a hydrogen-generating hydrolysis reaction, with hydrogen gas exiting through the pores and forming hydrogen-rich water with the water outside the filter bag, while simultaneously ensuring the hydrogen-generating hydrolysis reaction of the self-purifying hydrogen-generating material. Furthermore, due to the flocculation effect of attapulgite powder and chitosan powder, the resulting flocculants cannot be discharged through the filter bag, thereby reducing the increase of metal ion contamination in the hydrogen-rich water, preventing changes in the acidity or alkalinity of the hydrogen-rich water, and ensuring that the self-purifying hydrogen-generating material remains stable and does not diffuse in the water.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows: The self-purifying hydrogen production material of the present invention uses magnesium hydride as the hydrogen source for hydrolysis, and with the flocculation effect of attapulgite powder and chitosan, it can reduce the formation of magnesium hydroxide gel in water, prevent water from being polluted by third-party impurities, and has a better self-purification effect. No toxic or odorous gases are produced, which can ensure the quality of water and also purify the water. The hydrogen produced by its hydrolysis reaction improves the quality of water. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0031] Example

[0032] This embodiment provides a self-purifying hydrogen production material, which is composed of the following raw materials in parts by weight:

[0033] 1-5 parts magnesium hydride, 80-90 parts attapulgite powder, and 10-15 parts chitosan.

[0034] In this embodiment, magnesium hydride has a hydrogen storage capacity of up to 7.6-8.1 wt%. It can produce hydrogen through both thermal decomposition and hydrolysis. Hydrogen produced by magnesium hydride through hydrolysis is twice that produced by thermal decomposition of magnesium hydride, and the hydrogen release amount can reach 16 wt%, making it the best hydrogen release material.

[0035] In some instances, the magnesium hydride has a particle size of 10-50 nm; the attapulgite powder has a particle size of 50-100 nm.

[0036] In some instances, the attapulgite powder is made by calcining attapulgite at 480-520°C for 2-3 hours.

[0037] Preferably, the chemical composition of the attapulgite is Mg5(H2O)4(Si4O) 10 2(OH)2 is a magnesium-rich silicate mineral with a layered chain molecular structure. It possesses excellent cation exchange capacity, as well as adsorption and decolorization properties and strong flocculation ability. Using 90% purity attapulgite calcined at 300℃, the specific surface area is only 51.89 m². 2 / g, and after calcination at 500℃, the specific surface area can reach 117.07m². 2 Therefore, the modified attapulgite powder obtained by calcining at 500℃ for more than 2.5 hours has the best performance.

[0038] It should also be noted that attapulgite powder carries a negative charge, which can effectively adsorb metal ions in water. It can also surround and coat magnesium hydride powder. When magnesium hydride undergoes a hydrogen production hydrolysis reaction, it can immediately adsorb the magnesium ions produced by the reaction, making it difficult for a magnesium hydroxide gel coating layer to form around the magnesium hydride powder, thus avoiding the passivation of magnesium hydride powder.

[0039] In some instances, the chitosan is water-soluble chitosan.

[0040] It should be noted that water-soluble chitosan plays a role in flocculation and precipitation in self-purifying hydrogen production materials. The flocculation effect is to flocculate magnesium hydroxide gel and organic and inorganic impurities that are originally present in the water. After flocculation and encapsulation, a precipitate will be formed quickly, thereby ensuring the cleanliness, clarity and taste of the water.

[0041] It should also be noted that when soluble chitosan is combined with attapulgite powder, it forms an anion- and anion-binding mechanism to adsorb, flocculate, and precipitate metal ions and hydroxide ions in water. Soluble chitosan does not require the addition of acid for dissolution when used.

[0042] In this embodiment, the preparation of the self-purifying hydrogen production material includes the following steps:

[0043] Weigh 80-90 parts by weight of attapulgite powder and 10-15 parts by weight of chitosan and mix them to obtain a mixture.

[0044] Adding 1-5 parts by weight of magnesium hydride to the mixture and homogenizing it yields a self-purifying hydrogen production material.

[0045] In some instances, the mixing of attapulgite powder, chitosan, and magnesium hydride is carried out in a dual-motion mixer with a barrel volume of 30-50L, a mixing load of 45-65%, a barrel rotation speed of 25r / min, and a blade rotation speed of 50r / min.

[0046] In some instances, the mixing time of the attapulgite powder and the chitosan is 25-35 minutes; the mixing time of the mixture and the magnesium hydride is 50-120 minutes.

[0047] This embodiment also provides the application of self-purifying hydrogen production materials in the preparation of hydrogen-rich water. The application scenarios of this hydrogen-rich water include, but are not limited to, drinking water, bath water, and hydrogen absorption machines.

[0048] In some cases, self-purifying hydrogen production materials are packaged in filter bags. A certain amount of self-purifying hydrogen production material is placed in the filter bag to obtain a hydrogen production bag. The hydrogen production bag is then placed in a water body, where it reacts to produce hydrogen gas. The water containing dissolved hydrogen gas is called hydrogen-rich water.

[0049] In some examples, the filter bag has a pore size of 10-100 nm. Using a filter bag with this pore size allows the self-purifying hydrogen-generating material to come into contact with water and undergo a hydrogen-generating hydrolysis reaction, with hydrogen gas exiting through the pores and forming hydrogen-rich water with the water outside the filter bag, while simultaneously ensuring the hydrogen-generating hydrolysis reaction of the self-purifying hydrogen-generating material. Furthermore, due to the flocculation effect of attapulgite powder and chitosan powder, the resulting flocculants cannot be discharged through the filter bag, thereby reducing the increase of metal ion contamination in the hydrogen-rich water, preventing changes in the acidity or alkalinity of the hydrogen-rich water, and ensuring that the self-purifying hydrogen-generating material remains stable and does not diffuse in the water.

[0050] In this embodiment, the different amounts of magnesium hydride determine the hydrogen release density and application. When the amount of magnesium hydride in the self-purifying hydrogen production material is 1-2 parts by mass, it can be used as a hydrogen-rich additive for drinking water to prepare hydrogen-rich water; when the amount of magnesium hydride is 2-3 parts by mass, the self-purifying hydrogen production material can be used as a hydrogen-rich additive for bathing to prepare hydrogen-rich bathing water; when the amount of magnesium hydride is 3-5 parts by mass, the self-purifying hydrogen production material can be used as a hydrogen source for hydrogen absorption, such as a hydrogen absorption machine.

[0051] The following experimental examples illustrate the effectiveness of the self-purifying hydrogen production material of the present invention in preparing hydrogen-rich water:

[0052] Experimental Example 1

[0053] This experimental example provides a self-purifying hydrogen-generating material for preparing potable hydrogen-rich water. The material consists of 2 parts by weight of magnesium hydride, 85 parts by weight of attapulgite powder, and 13 parts by weight of soluble chitosan. The preparation process includes the following steps:

[0054] 1. Weigh out attapulgite powder and soluble chitosan, and mix them in a double-motion mixer for 30 minutes;

[0055] 2. Add magnesium hydride powder to the hopper of the dual-motion mixer and mix for 60 min. Seal the mixture with a filter bag to obtain a hydrogen production bag.

[0056] Performance Testing: Take 500mL of drinking water and place the hydrogen generator bag into it. After 1-2 minutes, a large number of bubbles escape from the hydrogen generator bag. After 15 minutes, the dissolved hydrogen in the drinking water tends to be saturated. Remove the hydrogen generator bag and use a TRUSTLEXENH-2000 to measure the hydrogen concentration in the remaining hydrogen-rich water. The concentration is 1.2 mmp-2.6 mmp. The soluble residual chlorine in the water was 0, the ozone content was 0, and the levels of arsenic, cadmium, lead, and mercury were all <0.001 mg / L. The selenium content was 0.005 mg / L, the aluminum content was 0.02 mg / L, the magnesium content was 0.2 mg / L, the iron content was 0.05 mg / L, the copper content was 0.3 mg / L, and the zinc content was 0.25 mg / L. All of these conditions meet the requirements of GB5749-2006 "Standards for Drinking Water Quality".

[0057] Experimental Example 2

[0058] This experimental example provides a self-purifying hydrogen-generating material for preparing hydrogen-rich bath water. The material consists of 3 parts by weight of magnesium hydroxide, 92 parts by weight of attapulgite powder, and 15 parts by weight of soluble chitosan powder. The preparation process includes the following steps:

[0059] 1. Weigh out attapulgite powder and soluble chitosan, and mix them in a double-motion mixer for 30 minutes;

[0060] 2. Add magnesium hydride powder to the hopper of the dual-motion mixer and mix for 60 min. Seal the mixture with a filter bag to obtain a hydrogen production bag.

[0061] Performance test: 200L of bath water was placed in the bathtub, and the hydrogen generator was put into the bath water. A large number of bubbles were generated immediately, and the bath water turned milky white. After 30 minutes, it tended to be saturated. The hydrogen concentration in the hydrogen-rich bath water was 1000-1800 ppb. The water was clear and transparent, and the pH value was 8.0.

[0062] Experimental Example 3

[0063] This experimental example provides a self-purifying hydrogen production material for use in hydrogen absorption mechanisms. This self-purifying hydrogen production material consists of 5 parts by weight of magnesium hydride, 85 parts by weight of attapulgite powder, and 10 parts by weight of soluble chitosan. The preparation includes the following steps:

[0064] 1. Weigh out attapulgite powder and soluble chitosan, and mix them in a double-motion mixer for 30 minutes;

[0065] 2. Add magnesium hydride powder to the hopper of the dual-motion mixer and mix for 60 min. Seal the mixture with a filter bag to obtain a hydrogen production bag.

[0066] Performance test: When the hydrogen production bag is placed in the water tank of the hydrogen generator, a large number of bubbles immediately overflow, and after 30 minutes, it tends to saturate. The hydrogen release termination time is 60 minutes, and the hydrogen release amount is 200 mL / g. The gas sample was collected and detected by gas chromatography. The purity of hydrogen is 99.999%.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-purifying hydrogen production material, characterized in that, The self-purifying hydrogen production material is composed of the following raw materials in parts by weight: 1-5 parts magnesium hydride, 80-90 parts attapulgite powder and 10-15 parts chitosan; The magnesium hydride has a particle size of 10-50 nm; the attapulgite powder has a particle size of 50-100 nm. The attapulgite powder is made by calcining attapulgite at 480-520℃ for 2-3 hours. The chitosan is water-soluble chitosan.

2. The self-purifying hydrogen production material according to claim 1, characterized in that, The self-purifying hydrogen production material is composed of the following raw materials in parts by weight: 1-2 parts magnesium hydride, 80-90 parts attapulgite powder, and 10-15 parts chitosan.

3. The self-purifying hydrogen production material according to claim 1, characterized in that, The self-purifying hydrogen production material is composed of the following raw materials in parts by weight: 2-3 parts magnesium hydride, 80-90 parts attapulgite powder, and 10-15 parts chitosan.

4. The self-purifying hydrogen production material according to claim 1, characterized in that, The self-purifying hydrogen production material is composed of the following raw materials in parts by weight: 3-5 parts magnesium hydride, 80-90 parts attapulgite powder, and 10-15 parts chitosan.

5. A method for preparing the self-purifying hydrogen production material according to any one of claims 1-4, characterized in that, Includes the following steps: Weigh 80-90 parts by weight of attapulgite powder and 10-15 parts by weight of chitosan and mix them to obtain a mixture. Adding magnesium hydride to the mixture and homogenizing it yields a self-purifying hydrogen production material.

6. The preparation method according to claim 5, characterized in that, The mixing time of the attapulgite powder and the chitosan is 25-35 min; the mixing time of the mixture and the magnesium hydride is 50-120 min.

7. The application of the self-purifying hydrogen production material according to any one of claims 1-4 in the preparation of hydrogen-rich water.