Silver-loaded sustained-release material for sterilizing drinking water and preparation method of silver-loaded sustained-release material

Abstract

The invention provides a silver-loaded slow-release material for sterilizing drinking water and a preparation method thereof, and the preparation method comprises the following steps: S1, adding activated carbon balls into a silver nitrate solution, and stirring to obtain a silver-adsorbed activated carbon dispersion liquid; s2, a chloride solution is added into the silver adsorption activated carbon dispersion liquid, stirring reaction continues, then solid-liquid separation and deionized water washing are conducted, and the silver-loaded slow-release material is obtained. According to the silver-loaded slow-release material, the special porous structure of the activated carbon is utilized, so that the loading capacity of silver is improved, and the water treatment capacity of a unit water treatment material is increased; the silver is deposited and adsorbed on the surface of the porous activated carbon in a compound form by adopting a deposition method, so that the silver is higher in dispersion degree, firmer in combination degree and not easy to lose activity, and the problem of active component loss caused by the fact that the silver is adsorbed on the surface of the material is avoided. According to the specific preparation method disclosed by the invention, dual characteristics of an activated carbon mesoporous structure and a silver ion compound form are combined, so that the slow and durable release of silver ions is ensured, and the service life of the material is prolonged.

Description

Technical Field

[0001] The invention belongs to the field of drinking water treatment, and in particular relates to a method for preparing a silver-loaded slow-release material for drinking water sterilization. Background Art

[0002] Among the deep purification technologies for drinking water currently used, adsorption technology is a perfect conventional treatment process. However, because adsorption materials usually have good biocompatibility and chemical compatibility, it is easy for microorganisms in water to reproduce on adsorption materials that adsorb organic matter, becoming a breeding ground for microorganisms, resulting in a significant increase in the number of microorganisms in water; in addition, some adsorbed microorganisms can convert ammonia in water into nitrite, causing an increase in nitrite in water.

[0003] Silver and its compounds have been widely used in the fields of medicine and health due to their excellent antibacterial and antimicrobial properties. The advantages of silver ions such as broad antibacterial spectrum, high bactericidal efficiency, and low resistance to drugs can eliminate the secondary pollution caused by the reproduction of microorganisms during the deep purification of drinking water. Traditional silver ion sterilization materials mainly physically adsorb silver ions. The release of silver ions is non-sustainable and volatile, which can easily cause the concentration of silver particles in the treated water to be unstable. In the early stage of use, the concentration of silver ions in the water increases sharply due to rapid release, causing unnecessary damage to the human body. In the later stage of use, it drops sharply due to insufficient sustainability, and the effect of lasting sterilization cannot be achieved. In view of this, this patent proposes a method for preparing a silver-carrying material with a long-lasting sustained release function for the sterilization of drinking water. Summary of the invention

[0004] A brief overview of the disclosure is given below in order to provide a basic understanding of certain aspects of the disclosure. It should be understood that this overview is not an exhaustive overview of the disclosure. It is not intended to identify key or important parts of the disclosure, nor is it intended to limit the scope of the disclosure. Its purpose is simply to give certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0005] The purpose of the present invention is to provide a silver-loaded sustained-release material for drinking water sterilization and a preparation method thereof, so as to solve the problems of short duration and unstable silver ion concentration in water of conventional silver-loaded sterilization materials in existing drinking water treatment proposed in the background technology.

[0006] In order to solve the above technical problems, the technical solution provided by the present disclosure is:

[0007] A method for preparing a silver-loaded sustained-release material for drinking water sterilization comprises the following steps:

[0008] S1: adding activated carbon balls into silver nitrate solution and stirring to obtain a silver adsorbed activated carbon dispersion;

[0009] S2: adding chloride solution to the silver-adsorbed activated carbon dispersion, continuing to stir the reaction, and then performing solid-liquid separation and washing with deionized water to obtain the silver-loaded sustained-release material.

[0010] In the above-mentioned method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a preferred embodiment, in step S1, the particle size of the activated carbon ball is 0.5-2 mm, the bulk density is 0.5-1.0 g / mL, and the specific surface area is 800-2200 m 2 / g, pore volume is 0.5~1.3cm 3 / g.

[0011] In the above-mentioned method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a preferred embodiment, in step S1, the concentration of the silver nitrate solution is 0.01-0.5 mol / L, and the volume ratio of the silver nitrate solution to the activated carbon balls is (5-20):1.

[0012] In the method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a preferred embodiment, in step S1, the temperature of the stirring treatment is 0-50°C.

[0013] In the method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a preferred embodiment, in step S1, the stirring treatment time is 15 to 180 minutes.

[0014] In the above-mentioned method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a preferred embodiment, in step S2, the chloride is at least one of sodium chloride, potassium chloride, lithium chloride, and calcium chloride; preferably, the chloride ion concentration in the chloride solution is 0.01-0.5 mol / L.

[0015] In the method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a preferred embodiment, in step S2, the molar ratio of chloride ions in the chloride solution to silver nitrate in step S1 is 1:1 to 1.5:1.

[0016] In the above method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a preferred embodiment, in step S2, the stirring reaction time is 30 to 360 minutes.

[0017] In the above-mentioned method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a preferred embodiment, in step S2, the solid-liquid separation is followed by washing with deionized water for more than three times.

[0018] A silver-loaded sustained-release material for drinking water sterilization is prepared according to the above preparation method.

[0019] Preferably, the silver-loaded slow-release material meets the requirements for long-term antibacterial treatment of drinking water: 1 liter of silver-loaded slow-release material can continuously treat 50 L of drinking water per day for more than 180 days, and the silver ion concentration in the treated water remains at 0.4-0.8 mg / L.

[0020] Compared with the prior art, the beneficial effects of the present invention include but are not limited to:

[0021] (1) Compared with traditional silver-loaded materials, the silver-loaded sustained-release material disclosed herein utilizes the special porous structure of activated carbon to have a higher silver loading capacity, thereby increasing the water treatment capacity per unit of water treatment material and reducing the amount of water treatment material used per unit.

[0022] (2) Compared with traditional silver-loaded materials, the silver-loaded sustained-release material disclosed herein uses a deposition method to deposit silver in the form of a compound onto the surface of porous activated carbon, making the silver more dispersed, more firmly bound, and less likely to lose activity, thereby avoiding the problem of loss of active ingredients caused by silver adsorbed on the material surface.

[0023] (3) The silver-loaded sustained-release material disclosed herein uses a specific preparation process and combines the dual characteristics of the activated carbon mesoporous structure and the silver ion compound form to ensure the slowness and durability of silver ion release, thereby increasing the service life of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a flow chart of a method for preparing a silver-loaded sustained-release material for drinking water sterilization according to a preferred embodiment of the present application. DETAILED DESCRIPTION

[0025] The preferred embodiment of the preparation method of a silver-loaded sustained-release material for drinking water sterilization in this application is shown in Figure 1 The flowchart shown includes the following steps:

[0026] S1: adding activated carbon balls into silver nitrate solution and stirring to obtain a silver adsorbed activated carbon dispersion;

[0027] S2: adding chloride solution to the silver-adsorbed activated carbon dispersion, continuing to stir the reaction, and then performing solid-liquid separation and washing with deionized water to obtain the silver-loaded sustained-release material.

[0028] The silver-loaded sustained-release material prepared by the above preparation method can meet the requirements of long-term antibacterial treatment of drinking water.

[0029] In the preparation method of the silver-loaded sustained-release material for drinking water sterilization, as a more preferred embodiment, in step S1, the particle size of the activated carbon ball is 0.5-2 mm (such as 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, etc.), the bulk density is 0.5-1.0 g / mL (such as 0.6 g / mL, 0.7 g / mL, 0.8 g / mL, 0.9 g / mL, etc.), and the specific surface area is 800-2200 m 2 / g (for example 900m 2 / g、1000m 2 / g、1200m 2 / g、1500m 2 / g、1800m 2 / g, 2000m 2 / g, 2100m 2 / g, etc.), pore volume is 0.5~1.3cm 3 / g (for example 0.6cm 3 / g, 0.7cm 3 / g, 0.8cm 3 / g, 0.9cm 3 / g, 1.0cm 3 / g, 1.1cm 3 / g, 1.2cm 3 / g, etc.).

[0030] In the above-mentioned method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a more preferred embodiment, in step S1, the concentration of the silver nitrate solution is 0.01-0.5 mol / L (for example, 0.05 mol / L, 0.1 mol / L, 0.2 mol / L, 0.3 mol / L, 0.4 mol / L, 0.45 mol / L, etc.), and the volume ratio of the silver nitrate solution to the activated carbon balls is (5-20):1 (for example, 8:1, 10:1, 12:1, 15:1, 18:1, etc.).

[0031] In the above-mentioned method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a more preferred embodiment, in step S1, the stirring treatment temperature is 0-50°C (such as 5°C, 10°C, 20°C, 30°C, 40°C, 45°C, etc.).

[0032] In the above-mentioned method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a more preferred embodiment, in step S1, the stirring treatment time is 15 to 180 minutes (for example, 30 minutes, 50 minutes, 60 minutes, 80 minutes, 100 minutes, 120 minutes, 150 minutes, 170 minutes, etc.).

[0033] In the above-mentioned method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a more preferred embodiment, in step S2, the chloride is at least one of sodium chloride, potassium chloride, lithium chloride, and calcium chloride.

[0034] In the above-mentioned method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a more preferred embodiment, in step S2, the chloride ion concentration in the chloride solution is 0.01-0.5 mol / L (for example, 0.05 mol / L, 0.1 mol / L, 0.2 mol / L, 0.3 mol / L, 0.4 mol / L, 0.45 mol / L, etc.).

[0035] In the above-mentioned method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a more preferred embodiment, the molar ratio of chloride ions in the chloride solution in step S2 to the silver nitrate in step S1 is 1:1 to 1.5:1 (such as 1.2:1, 1.4:1, etc.). In other words, in the present invention, the volume of the chloride solution described in step S2 is determined according to the molar amount of chloride ions in the chloride solution, and the molar amount of chloride ions in the chloride solution is 1 to 1.5 times the molar amount of silver nitrate in step S1.

[0036] In the above-mentioned method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a more preferred embodiment, in step S2, the stirring reaction time is 30 to 360 minutes (for example, 50 minutes, 90 minutes, 120 minutes, 150 minutes, 180 minutes, 210 minutes, 240 minutes, 270 minutes, 300 minutes, 330 minutes, etc.).

[0037] In the above-mentioned method for preparing the silver-loaded sustained-release material for drinking water sterilization, as a more preferred embodiment, in step S2, the solid-liquid separation is followed by washing with deionized water for more than three times.

[0038] The present application also provides a silver-loaded sustained-release material for sterilization of drinking water, which is prepared by the above-mentioned preparation method. Preferably, the silver-loaded sustained-release material meets the requirements for long-term antibacterial treatment of drinking water: 1 liter of silver-loaded sustained-release material continuously treats 50L of drinking water per day, and continuously treats for more than 180 days, and the silver ion concentration in the treated water remains at 0.4-0.8 mg / L. Within this concentration range, it is more conducive to the silver ions in the water to eliminate bacteria such as Escherichia coli and Staphylococcus aureus. If the silver ion concentration is too low, the bactericidal effect is not obvious; if the silver ion concentration is too high, it will cause inconvenience to the subsequent treatment. Generally, the silver-loaded sustained-release material is subjected to bactericidal and antibacterial treatment and then desilvered to meet the drinking water standards.

[0039] The following examples further illustrate the content of the present invention, but should not be construed as limiting the present invention. Without violating the spirit and essence of the present invention, the modification or replacement of the method, steps or conditions of the present invention belongs to the scope of the present invention.

[0040] The technical solution of the present disclosure will be described below in conjunction with exemplary embodiments.

[0041] Unless otherwise specified, the experimental methods used in the following examples are conventional methods.

[0042] Unless otherwise specified, the materials and reagents used in the following examples can be obtained from commercial sources.

[0043] Example 1

[0044] A silver-loaded sustained-release material for drinking water sterilization and a preparation method thereof are as follows:

[0045] (1) Take 1L of average particle size 1.0mm, bulk density 0.7g / mL, specific surface area 1000m 2 / g, pore volume is 0.5cm 3 / g of activated carbon balls were added into 20L of 0.01mol / L silver nitrate solution and stirred at 25°C for 60min to obtain a silver-loaded activated carbon dispersion.

[0046] (2) Add 20 L of a sodium chloride solution with a concentration of 0.01 mol / L to the silver-loaded activated carbon dispersion, continue stirring the reaction for 240 min, and then separate the solid and liquid. After washing three times with deionized water, a silver-loaded sustained-release material is obtained.

[0047] After testing, it was found that 1L of silver-loaded sustained-release material could continuously treat 50L of drinking water every day for 180 consecutive days. The silver ion concentration in the treated drinking water was tested every day (the testing method was "GB 11907-89 Determination of Silver in Water Quality - Flame Atomic Absorption Spectrophotometry"). The test data can be found in Table 1 below. It can be seen that the silver ion concentration in the treated drinking water was maintained at 0.50-0.80mg / L.

[0048] Table 1 Partial data of performance test of silver-loaded sustained-release material in Example 1 (Ag + Concentration / mg / L)

[0049]

[0050]

[0051] Example 2

[0052] A silver-loaded sustained-release material for drinking water sterilization and a preparation method thereof are as follows:

[0053] (1) Take 1L of average particle size 1.0mm, bulk density 0.7g / mL, specific surface area 1000m 2 / g, pore volume is 0.5cm 3 / g activated carbon balls were added into 10L of 0.01mol / L silver nitrate solution and stirred at 25°C for 120min to obtain a silver-loaded activated carbon dispersion.

[0054] (2) Add 10 L of a potassium chloride solution with a concentration of 0.01 mol / L to the silver-loaded activated carbon dispersion, continue stirring the reaction for 360 min, and then separate the solid and liquid. After washing three times with deionized water, a silver-loaded sustained-release material is obtained.

[0055] After testing, it was found that 1L of silver-loaded sustained-release material could continuously treat 50L of drinking water every day for 220 days, and the silver ion concentration in the treated drinking water was maintained at 0.40-0.70mg / L.

[0056] Example 3

[0057] A silver-loaded sustained-release material for drinking water sterilization and a preparation method thereof are as follows:

[0058] (1) Take 1L of average particle size 1.0mm, bulk density 0.7g / mL, specific surface area 1000m 2 / g, pore volume is 0.5cm 3 / g activated carbon balls were added into 15L of 0.05mol / L silver nitrate solution and stirred at 25°C for 180min to obtain a silver-loaded activated carbon dispersion.

[0059] (2) Add 15 L of lithium chloride solution with a concentration of 0.05 mol / L to the silver-loaded activated carbon dispersion, continue stirring the reaction for 180 min, separate the solid and liquid, and wash three times with deionized water to obtain a silver-loaded sustained-release material.

[0060] According to the test, the 1L silver-loaded sustained-release material can continuously treat 50L of drinking water every day for 200 days, and the silver ion concentration in the treated drinking water is maintained at 0.40-0.60mg / L.

[0061] Example 4

[0062] A silver-loaded sustained-release material for drinking water sterilization and a preparation method thereof are as follows:

[0063] (1) Take 1L of average particle size 1.0mm, bulk density 0.7g / mL, specific surface area 1000m 2 / g, pore volume is 0.5cm 3 / g activated carbon balls were added into 5L of 0.08mol / L silver nitrate solution and stirred at 0°C for 180min to obtain a silver-loaded activated carbon dispersion.

[0064] (2) Add 5 L of a sodium chloride solution with a concentration of 0.08 mol / L to the silver-loaded activated carbon dispersion, continue stirring the reaction for 300 min, and then separate the solid and liquid. After washing three times with deionized water, a silver-loaded sustained-release material is obtained.

[0065] After testing, it was found that 1L of silver-loaded sustained-release material could continuously treat 50L of drinking water every day for 240 days, and the silver ion concentration in the treated drinking water remained at 0.40-0.80mg / L.

[0066] Example 5

[0067] A silver-loaded sustained-release material for drinking water sterilization and a preparation method thereof are as follows:

[0068] (1) Take 1L of average particle size 1.5mm, bulk density 0.5g / mL, specific surface area 2000m 2 / g, pore volume is 1.2cm 3 / g of activated carbon balls were added into 10L of 0.3mol / L silver nitrate solution and stirred at 50°C for 180min to obtain a silver-loaded activated carbon dispersion.

[0069] (2) 10 L of a mixed solution of sodium chloride and potassium chloride with a concentration of 0.3 mol / L (in terms of chloride ions) was added to the silver-loaded activated carbon dispersion, with the molar ratio of sodium chloride to potassium chloride being 1:1. The mixture was stirred and reacted for 120 min, followed by solid-liquid separation. The mixture was washed three times with deionized water to obtain a silver-loaded sustained-release material.

[0070] After testing, it was found that 1L of silver-loaded sustained-release material could continuously treat 50L of drinking water every day for 180 days, and the silver ion concentration in the treated drinking water remained at 0.40-0.60mg / L.

[0071] Example 6

[0072] A silver-loaded sustained-release material for drinking water sterilization and a preparation method thereof are as follows:

[0073] (1) Take 1L of average particle size 1.5mm, bulk density 0.5g / mL, specific surface area 2000m 2 / g, pore volume is 1.2cm 3 / g of activated carbon balls were added into 5L of 0.25mol / L silver nitrate solution and stirred at 25°C for 120min to obtain a silver-loaded activated carbon dispersion.

[0074] (2) Add 5 L of a mixed solution of lithium chloride and potassium chloride with a concentration of 0.25 mol / L (in terms of chloride ions) to the silver-loaded activated carbon dispersion, with the molar ratio of lithium chloride to potassium chloride being 1:1. Continue stirring the reaction for 120 min, then separate the solid and liquid. Wash three times with deionized water to obtain a silver-loaded sustained-release material.

[0075] After testing, it was found that 1L of silver-loaded sustained-release material could continuously treat 50L of drinking water every day for 230 days, and the silver ion concentration in the treated drinking water was maintained at 0.40-0.65mg / L.

[0076] Comparative Example 1

[0077] This comparative example provides a silver-loaded sustained-release material for drinking water sterilization and a preparation method thereof, which differs from Example 2 only in that:

[0078] In step (2), potassium chloride is replaced by potassium bromide.

[0079] After testing, it was found that 1L of silver-loaded sustained-release material could be used to treat 50L of drinking water continuously every day for 220 days. The silver ion concentration in the treated drinking water was 0.8-8mg / L in the first 15 days, 0.4-0.8mg / L in 15-30 days, <0.4mg / L after 30 days, and <0.1mg / L after 80 days.

[0080] Comparative Example 2

[0081] This comparative example provides a silver-loaded sustained-release material for drinking water sterilization and a preparation method thereof, which differs from Example 2 only in that:

[0082] In step (2), potassium chloride is replaced by potassium iodide.

[0083] After testing, it was found that 1L of silver-loaded sustained-release material could be used to treat 50L of drinking water every day for 220 consecutive days. The silver ion concentration in the treated drinking water was 0.8-12mg / L in the first 10 days, 0.4-0.8mg / L in 10-20 days, <0.4mg / L after 20 days, and <0.1mg / L after 50 days.

[0084] Comparative Example 3

[0085] This comparative example provides a silver-loaded sustained-release material for drinking water sterilization and a preparation method thereof, which differs from Example 1 only in that:

[0086] After stirring in step (1), the mixture was boiled at 100° C. for 2 hours.

[0087] According to the test, 1L of silver-loaded sustained-release material can be used to treat 50L of drinking water continuously every day for 180 days. The silver ion concentration in the treated drinking water is 0.4-0.8mg / L in the first 100 days, and the silver ion concentration in the water is less than 0.4mg / L after 100 days.

[0088] Comparative Example 4

[0089] This comparative example provides a silver-loaded sustained-release material for drinking water sterilization and a preparation method thereof, which differs from Example 1 only in that:

[0090] The activated carbon balls used in step (1) have an average particle size of 3.0 mm, a bulk density of 0.4 g / mL, and a specific surface area of ​​650 m 2 / g, pore volume is 0.40cm 3 / g.

[0091] According to the test, 1L of silver-loaded sustained-release material can be used to treat 50L of drinking water every day for 180 consecutive days. The silver ion concentration in the treated drinking water is 0.4-0.8mg / L in the first 80 days, and the silver ion concentration in the water is less than 0.4mg / L after 80 days.

[0092] It can be seen from the above embodiments and comparative examples that the silver-loaded sustained-release material of the present invention, by means of a suitable preparation process, cleverly combines the dual characteristics of the activated carbon mesoporous structure and the silver ion compound form, ensures the slowness and persistence of silver ion release, improves the service life of the material, and can solve the problem that the silver ion release of traditional silver ion sterilization materials is unsustainable and volatile, which easily causes the concentration of silver particles in the treated water to be unstable, the silver ion concentration in the water in the early stage of use increases sharply due to rapid release, causing unnecessary damage to the human body, and drops sharply due to insufficient persistence in the later stage of use, and a lasting sterilization effect cannot be achieved.

[0093] Finally, it should be noted that, in the present disclosure, if any, relational terms such as first and second, etc., are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0094] Although the present disclosure has been disclosed above through the description of the specific embodiments of the present disclosure, it should be understood that those skilled in the art can design various modifications, improvements or equivalents to the present disclosure within the spirit and scope of the attached scheme. These modifications, improvements or equivalents should also be considered to be included in the scope of protection claimed by the present disclosure.

Claims

1. A method for preparing a silver-loaded sustained-release material for drinking water sterilization, characterized in that: The steps include: S1: adding activated carbon balls into silver nitrate solution and stirring to obtain a silver adsorbed activated carbon dispersion; S2: adding chloride solution to the silver-adsorbed activated carbon dispersion, continuing to stir the reaction, and then performing solid-liquid separation and washing with deionized water to obtain the silver-loaded sustained-release material.

2. The method for preparing the silver-loaded sustained-release material for drinking water sterilization according to claim 1, characterized in that: In step S1, the activated carbon balls have a particle size of 0.5 to 2 mm, a bulk density of 0.5 to 1.0 g / mL, and a specific surface area of ​​800 to 2200 m 2 / g, pore volume is 0.5~1.3cm 3 / g.

3. The method for preparing the silver-loaded sustained-release material for drinking water sterilization according to claim 1 or 2, characterized in that: In step S1, the concentration of the silver nitrate solution is 0.01-0.5 mol / L, and the volume ratio of the silver nitrate solution to the activated carbon balls is (5-20):

1.

4. The method for preparing a silver-loaded sustained-release material for drinking water sterilization according to any one of claims 1 to 3, characterized in that: In step S1, the temperature of the stirring treatment is 0-50°C.

5. The method for preparing a silver-loaded sustained-release material for drinking water sterilization according to any one of claims 1 to 4, characterized in that: In step S1, the stirring treatment time is 15 to 180 minutes.

6. The method for preparing a silver-loaded sustained-release material for drinking water sterilization according to any one of claims 1 to 5, characterized in that: In step S2, the chloride is at least one of sodium chloride, potassium chloride, lithium chloride and calcium chloride; preferably, the chloride ion concentration in the chloride solution is 0.01-0.5 mol / L.

7. The method for preparing a silver-loaded sustained-release material for drinking water sterilization according to any one of claims 1 to 6, characterized in that: The molar ratio of chloride ions in the chloride solution in step S2 to silver nitrate in step S1 is 1:1 to 1.5:

1.

8. The method for preparing a silver-loaded sustained-release material for drinking water sterilization according to any one of claims 1 to 7, characterized in that: In step S2, the stirring reaction time is 30 to 360 minutes.

9. The method for preparing a silver-loaded sustained-release material for drinking water sterilization according to any one of claims 1 to 8, characterized in that: In step S2, after solid-liquid separation, the product is washed with deionized water for more than three times.

10. A silver-loaded sustained-release material for sterilization of drinking water, prepared according to the preparation method described in any one of claims 1 to 9; preferably, the silver-loaded sustained-release material meets the requirements for long-term antibacterial treatment of drinking water: 1 liter of silver-loaded sustained-release material can continuously treat 50 L of drinking water per day for more than 180 days, and the silver ion concentration in the treated water is maintained at 0.4-0.8 mg / L.

Images