阅读说明：本技术 一种二氧化硅气凝胶氨基化接枝物及制备方法 (Silicon dioxide aerogel amination graft and preparation method thereof ) 是由 牛云辉 卢忠远 李军 唐乾坤 于 2021-01-19 设计创作，主要内容包括：本发明公开了本发明提供了一种二氧化硅气凝胶氨基化接枝物及制备方法,包括二氧化硅气凝胶制备以及二氧化硅氨基化步骤。本发明提供的一种二氧化硅气凝胶氨基化接枝物极其制备方法,用以配置能与水中的Mn～(2+)、Hg～(2+)、Ni～(2+)、Cu～(2+)、Pb～(2+)、Cd～(2+)、Cr～(3+)、Zn～(2+)、Fe～(2+)/Fe～(3+)等重金属离子迅速反应、结合成大的沉淀的重金属捕捉剂,将重金属离子从废水中分离。该重金属捕捉剂合成方法简单,可直接投入水中,且处理加药量少,反应生成的较大颗粒沉淀物,对高低浓度均能达到处理效果,其中对于含有高浓度的废水一次处理即可达到排放标准。(The invention discloses a silicon dioxide aerogel amination graft and a preparation method thereof, and the preparation method comprises the steps of silicon dioxide aerogel preparation and silicon dioxide amination. The invention provides a silicon dioxide aerogel amination graft and a preparation method thereof, which are used for preparing Mn capable of reacting with Mn in water 2+ 、Hg 2+ 、Ni 2+ 、Cu 2+ 、Pb 2+ 、Cd 2+ 、Cr 3+ 、Zn 2+ 、Fe 2+ /Fe 3+ The heavy metal ions react rapidly to combine into a large precipitated heavy metal trapping agent, and the heavy metal ions are separated from the wastewater. The heavy metal trapping agent has simple synthesis method, can be directly put into water, has small dosage, can treat large particle precipitates generated by reaction, can achieve the treatment effect on high and low concentrations, and can achieve the discharge standard by treating wastewater containing high concentration at one time.)

1. The preparation method of the silicon dioxide aerogel amination graft is characterized by comprising the following steps:

s1, uniformly mixing water glass and water ion water, adding acid to adjust the pH value of the solution to 3-4, fully hydrolyzing sodium silicate in the solution, adding ethanol and a drying control chemical additive, and stirring to obtain a uniformly mixed solution;

s2, adding ammonia water into the obtained uniform mixed solution, and adjusting the pH value to 7-8 to carry out a gelation reaction to obtain silicon dioxide gel;

s3, washing the prepared silica gel by using deionized water to remove impurities in the silica gel;

s4, soaking the silicon dioxide gel after the impurities are removed into a mixed solution of silicon alkoxide and absolute ethyl alcohol for aging treatment;

s5, washing the aged silica gel by using absolute ethyl alcohol, and preparing the silica aerogel under the normal pressure drying condition;

s6, mixing the prepared silica aerogel and 3-aminopropyltrimethoxysilane, adding toluene, stirring for 30 minutes to form a homogeneous solution, and purging the homogeneous solution with nitrogen for 30-40 minutes;

s7, reacting the glass flask filled with the homogeneous solution obtained in the step S6 in an oil bath at the temperature of 80 ℃ for 6.5-8.5 hours, and cooling to room temperature;

s8, carrying out suction filtration on the solution obtained by the reaction in the step S7, washing the solution with toluene and ethanol to obtain a filter cake, and carrying out vacuum drying on the filter cake at 75 ℃ for 5-12 hours to obtain amino functionalized SiO₂-(NH₂)_n。

2. The method for preparing silica aerogel aminated graft of claim 1, wherein the acid of said conditioning solution is oxalic acid.

3. The method of claim 1, wherein the drying control chemical additive is one of formamide, ethylene glycol, glycerol, and dimethylformamide.

4. The method for preparing silica aerogel amination grafts according to claim 1, wherein the volume ratio of the four solutions of water glass, deionized water, ethanol and drying control chemical additive in the step S1 is 1: (4-7): (0.45-0.65): (0.7-1.2).

5. The method for preparing silica aerogel aminated graft of claim 1, wherein the silicon alkoxide comprises one or both of methyl orthosilicate and ethyl orthosilicate.

6. The method for preparing silica aerogel aminated graft according to claim 1, wherein the aging treatment of step S4 is performed while the volume ratio of silica gel, silicon alkoxide and ethanol solution is 1: (0.15-0.32): (0.45-0.67).

7. The method for preparing silica aerogel aminated graft according to claim 1, wherein the aging treatment is carried out for 24-48 hours.

8. The method as claimed in claim 1, wherein the drying step S5 comprises drying at 35 deg.C for 5-8 hours, and then drying at 60 deg.C for 4-12 hours.

9. The method for preparing silica aerogel aminated graft according to claim 1, wherein the amount ratio of silica aerogel, 3-aminopropyltrimethoxysilane and toluene is 1: (10-35): (17-20).

10. A silica aerogel aminated graft characterized by being prepared by the method of the silica aerogel aminated graft according to any one of claims 1 to 9; the silicon dioxide aerogel amination graft is prepared from water glass, deionized water, ethanol, a drying control chemical additive, silicon alkoxide, 3-aminopropyl trimethoxy silane and toluene.

Technical Field

The invention relates to the field of wastewater treatment, in particular to a silicon dioxide aerogel amination graft and a preparation method thereof.

Background

In recent years, national environmental protection policies and regulations are tightened correspondingly, and the wastewater discharge standard is gradually improved. With the rapid development of modern industry and urbanization process, the generation amount of heavy metal wastewater is increasing day by day, environmental protection institutions and scientific research units polluted by heavy metals invest a lot of time and money to research how effective treatment can be carried out, the most effective and lowest-cost treatment method which reaches consensus is a chemical precipitation method, and a recapture agent related to the chemical precipitation method is one of the main means for treating the heavy metal wastewater due to simple equipment requirements. However, this conventional method has the following drawbacks:

(1) when the method for removing heavy metals by adjusting alkali is used, the pH value is generally controlled to be more than 10, and the value is higher than the discharge standard, so that the filtrate can be discharged only by adjusting the pH value of the filtrate to 6-9 after separation and precipitation;

(2) when amphoteric metal exists in the wastewater, the precipitate generated under the condition of over-high pH has the tendency of re-dissolution, and the discharge standard cannot be met after the precipitate is too low;

(3) certain components in the wastewater form very stable complexes with heavy metal ions, and the stability of the complexes is also higher than that of hydroxide of the heavy metal, and the stable heavy metal complexes cannot be removed by the alkali regulation method;

(4) the hydroxide of the heavy metal ions can be dissolved back along with the reduction of the pH value, so that the secondary pollution of the water body is caused.

(5) At present, the heavy metal capture agent in the market has wide application range, has poor effect on low-concentration heavy metal, and can not reach the standard for high-concentration wastewater by one-time treatment and can reach the emission standard by circular treatment. Meanwhile, the existing recapture agent on the market has the condition of large unit dosage during treatment.

Disclosure of Invention

The invention aims to solve the problems and provides a preparation method of a silicon dioxide aerogel aminated graft, which comprises the following steps:

s1, uniformly mixing water glass and water ion water, adding acid to adjust the pH value of the solution to 3-4, fully hydrolyzing sodium silicate in the solution, adding ethanol, drying and controlling chemical additives, and stirring to obtain a uniformly mixed solution;

s2, adding ammonia water into the obtained uniform mixed solution, and adjusting the pH value to 7-8 to carry out a gelation reaction to obtain silicon dioxide gel;

s3, washing the prepared silica gel by using deionized water to remove impurities in the silica gel;

s4, soaking the silicon dioxide gel after the impurities are removed into a mixed solution of silicon alkoxide and absolute ethyl alcohol for aging treatment;

s5, washing the aged silica gel by using absolute ethyl alcohol, and preparing the silica aerogel under the normal pressure drying condition;

s6, mixing the prepared silica aerogel and 3-aminopropyltrimethoxysilane, adding toluene, stirring for 30 minutes to form a homogeneous solution, and purging the homogeneous solution with nitrogen for 30-40 minutes;

s7, reacting the glass flask filled with the homogeneous solution obtained in the step S6 in an oil bath at the temperature of 80 ℃ for 6.5-8.5 hours, and cooling to room temperature;

s8, carrying out suction filtration on the solution obtained by the reaction in the step S7, washing the solution with toluene and ethanol to obtain a filter cake, and carrying out vacuum drying on the filter cake at 75 ℃ for 5-12 hours to obtain amino functionalized SiO₂-(NH₂)_n。

Further, the acid of the regulating solution is oxalic acid.

Further, the drying control chemical additive is one of formamide, ethylene glycol, glycerol and dimethylformamide.

Further, in the step S1, the volume ratio of the four solutions of water glass, deionized water, ethanol and the drying control chemical additive is 1: (4-7): (0.45-0.65): (0.7-1.2).

Further, the silicon alkoxide comprises one or two of methyl orthosilicate and ethyl orthosilicate.

Further, in the step S4, the volume ratio of the silica gel to the silicon alkoxide to the ethanol solution in the aging treatment is 1: (0.15-0.32): (0.45-0.67).

Further, the aging treatment time is 24-48 hours.

Further, the drying in step S5 is performed by drying at 35 ℃ for 5-8 hours, and then drying at 60 ℃ for 4-12 hours.

Further, the mass ratio of the silicon dioxide aerogel, the 3-aminopropyl trimethoxy silane and the toluene is 1: (10-35): (17-20).

On the other hand, the invention provides a silicon dioxide aerogel amination graft, and the preparation method of the silicon dioxide aerogel amination graft is adopted; the silicon dioxide aerogel amination graft is prepared from water glass, deionized water, ethanol, a drying control chemical additive, silicon alkoxide, 3-aminopropyl trimethoxy silane and toluene.

The invention has the beneficial effects that: the invention provides a silicon dioxide aerogel amination graft and a preparation method thereof, which are used for preparing Mn capable of reacting with Mn in water²⁺、Hg²⁺、Ni²⁺、Cu²⁺、Pb²⁺、Cd²⁺、Cr³⁺、Zn²⁺、Fe²⁺/Fe³⁺The heavy metal ions react rapidly to combine into a large precipitated heavy metal trapping agent, and the heavy metal ions are separated from the wastewater. The heavy metal trapping agent has simple synthesis method, can be directly put into water, has small dosage for treatment, generates larger particle precipitates through reaction, can achieve the treatment effect on high and low concentrations, and can achieve the discharge standard for treating wastewater containing high concentration at one time.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described.

SiO₂-(NH₂)_nPreparation:

(1) the preparation method of the silica aerogel comprises the following steps:

the preparation method of the silicon dioxide aerogel amination graft comprises the following steps:

s1, uniformly mixing water glass and water ion water, adding acid to adjust the pH value of the solution to 3-4, fully hydrolyzing sodium silicate in the solution, adding ethanol, drying and controlling chemical additives, and stirring to obtain a uniformly mixed solution;

s2, adding ammonia water into the obtained uniform mixed solution, and adjusting the pH value to 7-8 to carry out a gelation reaction to obtain silicon dioxide gel;

s3, washing the prepared silica gel by using deionized water to remove impurities in the silica gel;

s4, soaking the silicon dioxide gel after the impurities are removed into a mixed solution of silicon alkoxide and absolute ethyl alcohol for aging treatment;

s5, washing the aged silica gel by using absolute ethyl alcohol, and preparing the silica aerogel under the normal pressure drying condition;

(2) silicon dioxide amination step:

s6, mixing the prepared silica aerogel and 3-aminopropyltrimethoxysilane, adding toluene, stirring for 30 minutes to form a homogeneous solution, and purging the homogeneous solution with nitrogen for 30-40 minutes;

s7, reacting the glass flask filled with the homogeneous solution obtained in the step S6 in an oil bath at the temperature of 80 ℃ for 6.5-8.5 hours, and cooling to room temperature;

s8, carrying out suction filtration on the solution obtained by the reaction in the step S7, washing the solution with toluene and ethanol to obtain a filter cake, and carrying out vacuum drying on the filter cake at 75 ℃ for 5-12 hours to obtain amino functionalized SiO₂-(NH₂)_n。

It is to be noted that the acid of the conditioning solution is oxalic acid; the drying control chemical additive is one of formamide, glycol, glycerol and dimethylformamide; in the step S1, the volume ratio of the four solutions of water glass, deionized water, ethanol and the drying control chemical additive is 1: (4-7): (0.45-0.65): (0.7 to 1.2); the silicon alkoxide comprises one or two of methyl orthosilicate or ethyl orthosilicate; the volume ratio of the silica gel to the silanol salt to the ethanol solution in the aging treatment in the step S4 is 1: (0.15-0.32): (0.45-0.67); the aging treatment time is 24-48 hours; the drying in the step S5 is to carry out drying treatment at 35 ℃ for 5 to 8 hours and then drying at 60 ℃ for 4 to 12 hours; the mass ratio of the silicon dioxide aerogel, the 3-aminopropyl trimethoxy silane and the toluene is 1: (10-35): (17-20).

Based on the preparation method, the silicon dioxide aerogel amination graft is prepared from water glass, deionized water, ethanol, a drying control chemical additive, silicon alkoxide, 3-aminopropyl trimethoxy silane and toluene.

Preparing a heavy metal catching agent:

the preparation method of the heavy metal trapping agent comprises the following steps: mixing SiO₂-(NH₂)_nPreparing a methanol solution with the mass solubility of 20-35%, cooling to 4-10 ℃, and dropwise adding a carbon disulfide methanol solution with the mass solubility of 40-50% under a stirring state; heating to 25-30 ℃, stirring for reaction for 2-3.5 h, performing suction filtration, washing for 1-2 times with anhydrous alcohol, and drying to obtain an insoluble white solid recapture agent; mixing the dried insoluble white solid recapture agent with an alkali solution with the mass concentration of 20-30%, heating to 50-60 ℃, and reacting for 2 hours to obtain a light yellow liquid recapture agent.

The dropping speed of the carbon disulfide methanol solution is 2-7 drops/second; the absolute alcohol is absolute ethyl alcohol or methanol.

Based on the preparation method, the heavy metal trapping agent is prepared from SiO₂-(NH₂)_nCarbon disulfide, hydroxide, alcohol and water. Wherein the weight ratio of each component is as follows: SiO 2₂-(NH₂)_n: 2.5 to 4; carbon disulfide: 27-30; hydroxide: 7-9; alcohols: 38-47; water: 24-30; the SiO₂-(NH₂)_nThe modified silica aerogel is a silica aerogel amination graft, wherein the value of n in the silica aerogel amination graft is a natural number of 10-30, and the particle size of the silica aerogel particles is 10-60 microns; the alcohol is one or a mixture of more than two of methanol, ethanol, n-butanol, isobutanol, propanol and isopropanol; the hydroxide is one or a mixture of two of sodium hydroxide and potassium hydroxide in any proportion.

Heavy metal precipitation:

the heavy metal trapping agent feeding method comprises the following steps:

before actual use, a one-liter small test can be made according to the process.

Secondly, the pH value is adjusted to 6-9 when the wastewater is treated, and the treatment effect is better.

And thirdly, detecting the content of heavy metal ions in the wastewater, and determining the drug input amount through a wastewater simulation drug adding experiment.

Fourthly, the medicament can be continuously or batchwise added into the waste water and fully stirred for about 25 minutes.

Fifthly, after the reagents react fully, adding a proper amount of polyaluminium chloride (PAC) and Polyacrylamide (PAM) with high molecular weight to obtain better precipitation effect.

Sixthly, filtering and separating out precipitate, and obtaining the water reaching the standard after filtering.

Specifically, several embodiments are now provided to illustrate the implementation of the present invention.

The first embodiment is as follows:

selecting the following raw materials by weight:

SiO₂-(NH₂)_n：2.8g；

methanol solution of carbon disulfide: 80.4 g;

potassium hydroxide solution: 40 g.

The preparation process specifically comprises the following steps: using a 500g small closed reaction vessel with temperature control, 2.8g of SiO were placed₂-(NH₂)₁₈Preparing a methanol solution with the mass concentration of 20 percent and putting the methanol solution into a reaction kettle; the temperature is reduced to 10 ℃, and the reaction is carried out at the speed of 2 drops per second under the stirring stateDropwise adding 80.4g of methanol solution of 27% carbon disulfide by mass concentration into the kettle, heating to room temperature of 25 ℃ after dropwise adding, and continuously stirring for reaction for 2 hours; after two hours, filtering, and washing for 3 times by using absolute ethyl alcohol to obtain white powder; and putting the white powder and 40g of potassium hydroxide solution with the mass concentration of 20% into a reaction kettle, and stirring and reacting for 1.5 hours at the temperature of 50 ℃ to obtain the light yellow liquid recapture agent.

The effect of the heavy metal scavenger in the first embodiment: preparing copper, zinc, lead, cadmium and manganese ion solutions, and respectively measuring the initial concentration and the ion concentration after primary treatment by using an atomic absorption spectrophotometer, wherein the details are shown in the following table.

Ion species	Initial concentration (mg/L)	Concentration after one treatment (mg/L)	Emission standard (mg/L)
				Cu2+	338.35	0.3683	2
Zn2+	465.45	0.1931	5
				Pb2+	210.7	0.043	0.5
Cd2+	470.6	0.014	0.05
				Mn2+	428.15	0.2365	2

Example two:

selecting the following raw materials by weight:

SiO₂-(NH₂)_n：1.7g；

methanol solution of carbon disulfide: 100g of the total weight of the mixture;

potassium hydroxide solution: 65 g.

The preparation process specifically comprises the following steps: using a 500g small closed reaction vessel with temperature control, 1.7g of SiO were placed₂-(NH₂)₃₀Preparing a methanol solution with the mass concentration of 20 percent and putting the methanol solution into a reaction kettle; reducing the temperature to 10 ℃, dropwise adding 100g of methanol solution of carbon disulfide with the mass concentration of 20% into the reaction kettle at the speed of 2 drops per second under the stirring state, heating to the room temperature of 25 ℃ after dropwise adding, and continuously stirring and reacting for 2 hours; after two hours, filtering, and washing for 3 times by using absolute ethyl alcohol to obtain white powder; and putting the white powder and 65g of potassium hydroxide solution with the mass concentration of 20% into a reaction kettle, and stirring and reacting for 2 hours at the temperature of 55 ℃ to obtain the light yellow liquid recapture agent.

The effect of the heavy metal scavenger used in example two: preparing copper, zinc, lead, cadmium and manganese ion solutions, and respectively measuring the initial concentration and the ion concentration after primary treatment by using an atomic absorption spectrophotometer, wherein the details are shown in the following table.

Ion species	Initial concentration (mg/L)	Concentration after one treatment (mg/L)	Emission standard (mg/L)
				Cu2+	338.35	0.0651	2
Zn2+	465.45	0.6901	5
				Pb2+	210.7	0.203	0.5
Cd2+	470.6	0.02	0.05
				Mn2+	428.15	0.1302	2

Example three:

selecting the following raw materials by weight:

SiO₂-(NH₂)_n：2.4g；

40% carbon disulfide in methanol: 49 g;

20% sodium hydroxide solution: 29 g.

The preparation process specifically comprises the following steps: using a 500g small closed reaction vessel with temperature control, 2.4g of SiO were placed₂-(NH₂)₂₂Preparing a methanol solution with the mass concentration of 25 percent and putting the methanol solution into a reaction kettle; reducing the temperature to 10 ℃, dropwise adding 49g of methanol solution of carbon disulfide with the mass concentration of 40% into the reaction kettle at the speed of 2 drops per second under the stirring state, heating to the room temperature of 25 ℃ after dropwise adding, and continuously stirring and reacting for 2 hours; after two hours, filtering, and washing for 3 times by using absolute ethyl alcohol to obtain white powder; and putting the white powder and 29g of sodium hydroxide solution with the mass concentration of 20% into a reaction kettle, and stirring and reacting for 1.5 hours at the temperature of 52 ℃ to obtain the light yellow liquid recapture agent.

The effect of the heavy metal scavenger in the third example: preparing copper, zinc, lead, cadmium and manganese ion solutions, and respectively measuring the initial concentration and the ion concentration after primary treatment by using an atomic absorption spectrophotometer, wherein the details are shown in the following table.

Ion species	Initial concentration (mg/L)	Concentration after one treatment (mg/L)	Emission standard (mg/L)
				Cu2+	338.35	0.1001	2
Zn2+	465.45	0.318	5
				Pb2+	210.7	0.11	0.5
Cd2+	470.6	0.05	0.05
				Mn2+	428.15	0.414	2

Example four:

selecting the following raw materials by weight:

SiO₂-(NH₂)_n：4.2g；

45% carbon disulfide in methanol: 68g of a mixture;

25% sodium hydroxide solution: 33 g.

The preparation process specifically comprises the following steps: using a 500g small closed reaction vessel with temperature control, 4.2g of SiO were placed₂-(NH₂)₁₂Preparing into 20% methanol solutionPutting the mixture into a reaction kettle; reducing the temperature to 10 ℃, dropwise adding 68g of methanol solution of carbon disulfide with the mass concentration of 45% into the reaction kettle at the speed of 2 drops per second under the stirring state, after the dropwise adding is finished, heating to the room temperature of 25 ℃, and continuously stirring and reacting for 1.5 hours; after two hours, filtering, and washing for 3 times by using absolute ethyl alcohol to obtain white powder; and putting the white powder and 33g of 25% sodium hydroxide solution into a reaction kettle, and stirring and reacting for 2 hours at the temperature of 60 ℃ to obtain the light yellow liquid recapture agent.

The effect of the heavy metal scavenger in the fourth example: preparing copper, zinc, lead, cadmium and manganese ion solutions, and respectively measuring the initial concentration and the ion concentration after primary treatment by using an atomic absorption spectrophotometer, wherein the details are shown in the following table.

Ion species	Initial concentration (mg/L)	Concentration after one treatment (mg/L)	Emission standard (mg/L)
				Cu2+	338.35	0.41	2
Zn2+	465.45	0.53	5
				Pb2+	210.7	0.05	0.5
Cd2+	470.6	0.05	0.05
				Mn2+	428.15	0.614	2

Example five:

selecting the following raw materials by weight:

SiO₂-(NH₂)_n：5.6g；

50% carbon disulfide in methanol: 78g of a mixture;

20% sodium hydroxide solution: 52 g.

The preparation process specifically comprises the following steps: using a 500g small closed reaction vessel with temperature control, 5.6g of SiO were placed₂-(NH₂)₁₀Preparing a methanol solution with the mass concentration of 25 percent and putting the methanol solution into a reaction kettle; reducing the temperature to 10 ℃, dropwise adding 78g of methanol solution of carbon disulfide with the mass concentration of 50% into the reaction kettle at the speed of 3 drops per second under the stirring state, heating to the room temperature of 25 ℃ after dropwise adding, and continuously stirring and reacting for 2 hours; after two hours, filtering, and washing for 3 times by using absolute ethyl alcohol to obtain white powder; and putting the white powder and 52g of sodium hydroxide solution with the mass concentration of 20% into a reaction kettle, and stirring and reacting for 2 hours at the temperature of 50 ℃ to obtain the light yellow liquid recapture agent.

The use effect of the heavy metal scavenger in the fifth embodiment: preparing copper, zinc, lead, cadmium and manganese ion solutions, and respectively measuring the initial concentration and the ion concentration after primary treatment by using an atomic absorption spectrophotometer, wherein the details are shown in the following table.

Ion species	Initial concentration (mg/L)	Concentration after one treatment (mg/L)	Emission standard (mg/L)
				Cu2+	338.35	0.011	2
Zn2+	465.45	0.4506	5
				Pb2+	210.7	0.008	0.5
Cd2+	470.6	0.001	0.05
				Mn2+	428.15	0.114	2

Example six:

selecting the following raw materials by weight:

SiO₂-(NH₂)_n：5.6g；

50% carbon disulfide in methanol: 78g of a mixture;

20% potassium hydroxide solution: 72 g.

The preparation process specifically comprises the following steps: using a 500g small closed reaction vessel with temperature control, 5.6g of SiO were placed₂-(NH₂)₁₀Preparing a methanol solution with the mass concentration of 25 percent and putting the methanol solution into a reaction kettle; reducing the temperature to 10 ℃, dropwise adding 78g of methanol solution of carbon disulfide with the mass concentration of 50% into the reaction kettle at the speed of 3 drops per second under the stirring state, heating to the room temperature of 25 ℃ after dropwise adding, and continuously stirring and reacting for 2 hours; after two hours, filtering, and washing for 3 times by using absolute ethyl alcohol to obtain white powder; and putting the white powder and 72g of potassium hydroxide solution with the mass concentration of 20% into a reaction kettle, and stirring and reacting for 2 hours at the temperature of 50 ℃ to obtain the light yellow liquid recapture agent.

The use effect of the heavy metal scavenger in the sixth embodiment: preparing copper, zinc, lead, cadmium and manganese ion solutions, and respectively measuring the initial concentration and the ion concentration after primary treatment by using an atomic absorption spectrophotometer, wherein the details are shown in the following table.

Ion species	Initial concentration (mg/L)	Concentration after one treatment (mg/L)	Emission standard (mg/L)
				Cu2+	338.35	0.147	2
Zn2+	465.45	0.2686	5
				Pb2+	210.7	0.005	0.5
Cd2+	470.6	0.001	0.05
				Mn2+	428.15	0.617	2

The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.