CN114259993A - Process for repairing chromium-polluted underground water by adopting micro-nano composite particles - Google Patents
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Abstract
The process for repairing chromium-polluted underground water comprises the following steps: s1, preparing porous ZrO2A material; s2, preparing the porous ZrO prepared in the step S12Dissolving the material in NMMO aqueous solvent to obtain ZrO2a/NMMO mixed liquor; s3, ZrO is used2Preparing cellulose-ZrO by using/NMMO mixed liquor as solvent and bamboo pulp cellulose as cellulose precursor2Compounding aerogel; s4, preparing the obtained cellulose-ZrO from the step S32Composite aerogelGrafting carbonyl or phenolic hydroxyl on the surface of the gel to obtain surface-modified cellulose-ZrO2Compounding aerogel; s5, preparing the modified cellulose-ZrO in the step S42Loading nano iron on the outer side of the composite aerogel to obtain micro-nano composite particles; and S6, repairing the underground water by adopting the micro-nano composite particles. The invention adopts the combination of micro-nano composite particles and the ex-situ remediation technology, and can greatly reduce the pollution of heavy metal chromium in the underground water.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a process for repairing chromium-polluted underground water by adopting micro-nano composite particles.
Background
The underground water is a natural resource essential for human life maintenance, has the advantages of wide distribution, stable water quality parameters, difficult pollution and the like compared with surface water, and is an excellent water supply source. The total amount of water resources in China is large, but the water resources are scarce by everyone and are 1/4 which is the average level in the world.
China has more south than north and less underground water resources, and the total amount of the underground water resources accounts for 1/3 of the total amount of water resources in China. In recent years, the population growth and economic development of China are rapid, so that the supply and demand situation of underground water resources is more severe. With the increasing annual exploitation amount of underground water in China, people have to face a plurality of underground water pollution problems generated in the exploitation process.
The Cr-containing compound (mainly chromite) is widely applied to industrial production processes of tanning, printing and dyeing, metallurgy, electroplating and the like to enhance the mechanical property of metal or improve the chemical property of the metal. Cr slag (containing a certain amount of Na2 CrO) generated in the production process of Cr salt4And CaCrO4) Cr (VI) generated by long-term open-air piling can permeate into the underground water environment through soil along with rainfall or surface runoff. Chromium is present in water in hexavalent and trivalent forms, and hexavalent chromium is relatively toxic and is therefore commonly referred to as hexavalent chromium as a contaminant. Acute poisoning can be caused by a large amount of intake of a human body, and chronic poisoning can be caused by a small amount of intake for a long time. Hexavalent chromium is an important index in the sanitary standard, and the total chromium content in drinking water is required to be not more than 0.05mg/L by WHO 'Drinking Water quality criteria'. The total chromium content in drinking water is not more than 0.1mg/L according to the provisions of United states EPA national Drinking Water quality Standard. China requires that the content of chromium in drinking water is not more than 0.05mg/L, and agricultural irrigation water and fishery water are less than 0.1 mg/L. Chromium-containing waste gas, waste water, waste residue and the like discharged from chromium iron smelting, refractory material, electroplating, leather making, pigment, chemical industry and other industrial production and fuel combustion are chromium pollution sources. One aircraft manufacturer in the United states discharges high-chromium wastewater for a long time, and the chromium concentration of nearby underground water is up to 14 mg/L. As a large amount of chromium-containing wastewater flows into the Shanghai Suzhou river in China, the river water is more toxicThe detection rate of large hexavalent chromium is as high as 17.6 percent and the highest detection rate is 1.30 mg/L.
Cellulose molecules contain a large number of amino groups, and the cellulose has strong adsorption capacity on metal ions. However, there are some disadvantages to cellulose in applications, such as a narrow applicable pH range; has degradability under acid-base conditions, and the product is unstable. The cellulose can be cross-linked and modified by bifunctional aldehyde or acid anhydride, so that the product has stable property, is insoluble and has little swelling.
Disclosure of Invention
The technical problem to be solved is as follows: the invention aims to provide a process for repairing chromium-polluted underground water by adopting micro-nano composite particles, which combines the micro-nano composite particles with an ex-situ repair technology and can greatly reduce the pollution of heavy metal chromium in the underground water.
The technical scheme is as follows: a process for repairing chromium-polluted underground water by adopting micro-nano composite particles comprises the following steps:
s1, preparing a ZrOCl2 solution with a certain concentration, adding particles capable of decomposing at high temperature, stirring and dipping, then adding ammonia water, reacting in a high-pressure reaction kettle, adding a muffle furnace after the reaction is finished, and firing at high temperature to obtain porous ZrO2A material;
s2, preparing the porous ZrO prepared in the step S12Dissolving the material in NMMO aqueous solvent to obtain ZrO2a/NMMO mixed liquor;
s3, ZrO is used2Preparing cellulose-ZrO by using/NMMO mixed liquor as solvent and bamboo pulp cellulose as cellulose precursor2Compounding aerogel;
s4, preparing the obtained cellulose-ZrO from the step S32Grafting carbonyl or phenolic hydroxyl on the surface of the composite aerogel to obtain surface modified cellulose-ZrO2Compounding aerogel;
s5, loading nano iron on the outer side of the modified cellulose-ZrO 2 composite aerogel prepared in the step S4 to obtain micro-nano composite particles;
and S6, putting the micro-nano composite particles into underground water to be treated, fully stirring and oscillating, adjusting the pH, and filtering to obtain the treated underground water.
Preferably, the high-temperature decomposed particles in the step S2 are particles which can be decomposed at the temperature of 200-750 ℃, and the diameter of the particles is 100um-2 mm.
Preferably, the pyrolysis particles include various types of wood flour, starch and resin.
Preferably, ZrOCl in step S12The concentration of the solution is 0.1-0.2mol/L, the temperature in the high-pressure reaction kettle is 120-140 ℃, the reaction time is 20-40h, and the high-temperature ignition temperature is 780-850 ℃.
Preferably, the aqueous NMMO solvent concentration in the step S2 is 90-92 wt%, and the porous ZrO2 is2The concentration in NMMO aqueous solvent is 2-5 wt%.
Preferably, the bamboo pulp cellulose is dissolved in ZrO in the step S32Heating and vacuumizing the NMMO mixed solution at the temperature of 105-115 ℃ for dissolving for 7 hours to obtain black cellulose/ZrO with the concentration of 2-6 wt%2Mixed solution of/NMMO.
Preferably, the cellulose-ZrO in the step S42The process for grafting phenolic hydroxyl on the surface of the composite aerogel comprises the step of grafting cellulose-ZrO2Mixing and stirring the composite aerogel and the tannic acid solution, washing and drying after full reaction to obtain the tannic acid modified cellulose-ZrO2And (3) compounding the aerogel.
Preferably, in the step S5, the granular modified cellulose-ZrO is prepared by dissolving ferric chloride in an aqueous ethanol solution to prepare a ferric chloride solution2And adding the composite aerogel into the ferric chloride solution, reacting and stirring under an anaerobic condition, then dropwise adding the KBH4 solution, and reacting to generate the micro-nano composite particles.
Preferably, the input amount of the micro-nano composite particles in the groundwater needing to be treated in the step S6 is 7-25 g/L.
Has the advantages that: the invention has the following advantages:
(1) the cellulose surface contains a large amount of-OH which can be Cd6+Adsorption providing binding sites, cellulose-ZrO2The composite aerogel has larger specific surface area, more negatively charged active sites and better adsorption performance on cadmium ions;
(2) in the present invention, hollow porous ZrO is used2Replace the prior nano ZrO2It has better adsorption effectGood because of the relatively large specific surface and developed voids, more active centers on the surface can be electrostatically adsorbed, and the adsorption effect is rather good;
(3) tannin is grafted on cellulose-ZrO through chemical action2The adsorption effect of the composite aerogel surface is obviously improved after the tannin is grafted, which shows that the tannin modification improves the cellulose-ZrO2The adsorption capacity of the composite aerogel;
(4) when the micro-nano composite particles prepared by the method are used for treating underground water, the input amount, the pH value and the adsorption time have influence on the treatment effect of the underground water, the optimal input amount is 25g/L, the pH value is set to be 5-7, and the treatment time is 60min, which shows that the micro-nano particles can well adsorb and treat Cd under the neutral condition6+And has more adsorption sites.
Detailed Description
Example 1
A process for repairing chromium-polluted underground water by adopting micro-nano composite particles comprises the following steps:
s1, preparing a ZrOCl2 solution with the concentration of 0.1mol/L, adding wood powder with the diameter of 100um, stirring and dipping, then adding ammonia water, reacting in a high-pressure reaction kettle at the temperature of 120 ℃ for 40h, adding into a muffle furnace after the reaction is finished, and burning at the temperature of 780 ℃ to obtain porous ZrO2A material;
s2, preparing the porous ZrO prepared in the step S12Dissolving the material in 92 wt% concentration NMMO water solvent to obtain 5 wt% concentration ZrO2a/NMMO mixed liquor;
s3, ZrO is used2Dissolving bamboo pulp cellulose in ZrO using NMMO mixed solution as solvent and bamboo pulp cellulose as cellulose precursor2Heating and vacuumizing the NMMO mixed solution at 105 ℃ for dissolving for 7 hours to obtain black cellulose/ZrO with the concentration of 6 wt%2NMMO mixed liquor, cellulose/ZrO2Pouring the NMMO mixed solution into a granulation mould for granulation, demoulding after solidification, freezing and drying to obtain the cellulose-ZrO2Compounding aerogel;
s4, preparing the obtained cellulose-ZrO from the step S32Composite aerogelMixing and stirring glue and tannic acid solution with the concentration of 3g/L, washing unreacted substances after full reaction, and drying to obtain the tannic acid modified cellulose-ZrO2Compounding aerogel;
s5, dissolving ferric chloride in an ethanol water solution to prepare a ferric chloride solution, and mixing granular modified cellulose-ZrO2Adding the composite aerogel into the ferric chloride solution, reacting and stirring under an anaerobic condition, and then dropwise adding KBH4Solutions of ferric chloride and KBH4,The mass ratio of the micro-nano composite particles to the nano composite particles is 2:3, and micro-nano composite particles are generated through reaction;
s6, putting the micro-nano composite particles into underground water to be treated, adjusting the pH to 5 with the input amount of 25g/L, fully stirring and shaking, and filtering to obtain the treated underground water.
Example 2
A process for repairing chromium-polluted underground water by adopting micro-nano composite particles comprises the following steps:
s1, preparing a ZrOCl2 solution with the concentration of 0.2mol/L, adding resin particles with the diameter of 2mm, stirring and dipping, then adding ammonia water, reacting in a high-pressure reaction kettle at the temperature of 140 ℃ for 20h, adding the mixture into a muffle furnace after the reaction is finished, and burning at the temperature of 850 ℃ to obtain porous ZrO2A material;
s2, preparing the porous ZrO prepared in the step S12Dissolving the material in NMMO aqueous solvent with the concentration of 90 wt% to obtain ZrO with the concentration of 2 wt%2a/NMMO mixed liquor;
s3, ZrO is used2Dissolving bamboo pulp cellulose in ZrO using NMMO mixed solution as solvent and bamboo pulp cellulose as cellulose precursor2Heating and vacuumizing the NMMO mixed solution at 115 ℃ for dissolving for 7 hours to obtain black cellulose/ZrO with the concentration of 2 wt%2NMMO mixed liquor, cellulose/ZrO2Pouring the NMMO mixed solution into a granulation mould for granulation, demoulding after solidification, freezing and drying to obtain the cellulose-ZrO2Compounding aerogel;
s4, preparing the obtained cellulose-ZrO from the step S32Mixing the composite aerogel with 5g/L tannic acid solution, stirring, washing unreacted substances after full reaction, and drying to obtain the final productTo tannin modified cellulose-ZrO2Compounding aerogel;
s5, dissolving ferric chloride in an ethanol water solution to prepare a ferric chloride solution, and mixing granular modified cellulose-ZrO2Adding the composite aerogel into the ferric chloride solution, reacting and stirring under an anaerobic condition, and then dropwise adding KBH4Solutions of ferric chloride and KBH4,The mass ratio of the micro-nano composite particles to the nano composite particles is 2:2, and micro-nano composite particles are generated through reaction;
s6, putting the micro-nano composite particles into underground water to be treated, adjusting the pH to 5 with the input amount of 25g/L, fully stirring and shaking, and filtering to obtain the treated underground water.
Example 3
A process for repairing chromium-polluted underground water by adopting micro-nano composite particles comprises the following steps:
s1, preparing a ZrOCl2 solution with the concentration of 0.15mol/L, adding polylactic acid particles with the diameter of 1mm, stirring and dipping, then adding ammonia water, reacting in a high-pressure reaction kettle at the temperature of 125 ℃ for 30h, adding into a muffle furnace after the reaction is finished, and firing at the temperature of 800 ℃ to obtain porous ZrO2A material;
s2, preparing the porous ZrO prepared in the step S12The material is dissolved in NMMO aqueous solvent with the concentration of 90 wt% to obtain ZrO with the concentration of 3.6 wt%2a/NMMO mixed liquor;
s3, ZrO is used2Dissolving bamboo pulp cellulose in ZrO using NMMO mixed solution as solvent and bamboo pulp cellulose as cellulose precursor2Heating and vacuumizing the NMMO mixed solution at 110 ℃ for dissolving for 7 hours to obtain black cellulose/ZrO with the concentration of 46 wt%2NMMO mixed liquor, cellulose/ZrO2Pouring the NMMO mixed solution into a granulation mould for granulation, demoulding after solidification, freezing and drying to obtain the cellulose-ZrO2Compounding aerogel;
s4, preparing the obtained cellulose-ZrO from the step S32Mixing and stirring the composite aerogel and a tannic acid solution with the concentration of 3.2g/L, washing unreacted substances after full reaction, and drying to obtain the tannic acid modified cellulose-ZrO2Compounding aerogel;
s5, dissolving ferric chloride in an ethanol water solution to prepare a ferric chloride solution, and mixing granular modified cellulose-ZrO2Adding the composite aerogel into the ferric chloride solution, reacting and stirring under an anaerobic condition, and then dropwise adding KBH4Solutions of ferric chloride and KBH4,The mass ratio of the micro-nano composite particles to the nano composite particles is 2:3, and micro-nano composite particles are generated through reaction;
s6, putting the micro-nano composite particles into underground water to be treated, adjusting the pH to 5 with the input amount of 25g/L, fully stirring and shaking, and filtering to obtain the treated underground water.
Comparative example 1
A process for repairing chromium-polluted underground water by adopting micro-nano composite particles comprises the following steps:
s1, nano ZrO is mixed2The material is dissolved in NMMO aqueous solvent with the concentration of 90 wt% to obtain ZrO with the concentration of 3.6 wt%2a/NMMO mixed liquor;
s2. ZrO made from2Dissolving bamboo pulp cellulose in ZrO using NMMO mixed solution as solvent and bamboo pulp cellulose as cellulose precursor2Heating and vacuumizing the NMMO mixed solution at 110 ℃ for dissolving for 7 hours to obtain black cellulose/ZrO with the concentration of 46 wt%2NMMO mixed liquor, cellulose/ZrO2Pouring the NMMO mixed solution into a granulation mould for granulation, demoulding after solidification, freezing and drying to obtain the cellulose-ZrO2Compounding aerogel;
s3, preparing the obtained cellulose-ZrO from the step S22Mixing and stirring the composite aerogel and a tannic acid solution with the concentration of 3.2g/L, washing unreacted substances after full reaction, and drying to obtain the tannic acid modified cellulose-ZrO2Compounding aerogel;
s4, dissolving ferric chloride in an ethanol water solution to prepare a ferric chloride solution, and mixing granular modified cellulose-ZrO2Adding the composite aerogel into the ferric chloride solution, reacting and stirring under an anaerobic condition, and then dropwise adding KBH4Solutions of ferric chloride and KBH4,The mass ratio of the micro-nano composite particles to the nano composite particles is 2:3, and micro-nano composite particles are generated through reaction;
s5, putting the micro-nano composite particles into underground water to be treated, wherein the adding amount is 25g/L, adjusting the pH value to be 5, fully stirring and shaking, and filtering to obtain the treated underground water.
Comparative example 2
A process for repairing chromium-polluted underground water by adopting micro-nano composite particles comprises the following steps:
s1, preparing a ZrOCl2 solution with the concentration of 0.15mol/L, adding polylactic acid particles with the diameter of 1mm, stirring and dipping, then adding ammonia water, reacting in a high-pressure reaction kettle at the temperature of 125 ℃ for 30h, adding into a muffle furnace after the reaction is finished, and firing at the temperature of 800 ℃ to obtain porous ZrO2A material;
s2, preparing the porous ZrO prepared in the step S12The material is dissolved in NMMO aqueous solvent with the concentration of 90 wt% to obtain ZrO with the concentration of 3.6 wt%2a/NMMO mixed liquor;
s3, ZrO is used2Dissolving bamboo pulp cellulose in ZrO using NMMO mixed solution as solvent and bamboo pulp cellulose as cellulose precursor2Heating and vacuumizing the NMMO mixed solution at 110 ℃ for dissolving for 7 hours to obtain black cellulose/ZrO with the concentration of 46 wt%2NMMO mixed liquor, cellulose/ZrO2Pouring the NMMO mixed solution into a granulation mould for granulation, demoulding after solidification, freezing and drying to obtain the cellulose-ZrO2Compounding aerogel;
s4, dissolving ferric chloride in an ethanol water solution to prepare a ferric chloride solution, and dissolving granular cellulose-ZrO2Adding the composite aerogel into the ferric chloride solution, reacting and stirring under an anaerobic condition, and then dropwise adding KBH4Solutions of ferric chloride and KBH4,The mass ratio of the micro-nano composite particles to the nano composite particles is 2:3, and micro-nano composite particles are generated through reaction;
s5, putting the micro-nano composite particles into underground water to be treated, wherein the adding amount is 25g/L, adjusting the pH value to be 5, fully stirring and shaking, and filtering to obtain the treated underground water.
The adsorption time in the above examples and comparative examples was 60min, and the differences between the comparative examples and comparative examples in the following table, as can be seen from the table, using nano ZrO2Substitute for porous ZrO2The material has slightly reduced adsorption effect and adopts porous ZrO2Materials which improve the absorption of composite materialscellulose-ZrO modified with tannic acid2The composite aerogel has better adsorption effect on the later stage.
| Percentage adsorption (%) | |
| Example 1 | 91.65 |
| Example 2 | 95.54 |
| Example 3 | 98.65 |
| Comparative example 1 | 88.32 |
| Comparative example 2 | 85.19 |
Example 4
A process for repairing chromium-polluted underground water by adopting micro-nano composite particles comprises the following steps:
s1, preparing a ZrOCl2 solution with the concentration of 0.15mol/L, adding polylactic acid particles with the diameter of 1mm, stirring and dipping, then adding ammonia water, reacting in a high-pressure reaction kettle at the temperature of 125 ℃ for 30h, adding into a muffle furnace after the reaction is finished, and firing at the temperature of 800 ℃ to obtain porous ZrO2A material;
s2, preparing the porous ZrO prepared in the step S12The material is dissolved in NMMO aqueous solvent with the concentration of 90 wt% to obtain ZrO with the concentration of 3.6 wt%2a/NMMO mixed liquor;
s3, ZrO is used2Dissolving bamboo pulp cellulose in ZrO using NMMO mixed solution as solvent and bamboo pulp cellulose as cellulose precursor2Heating and vacuumizing the NMMO mixed solution at 110 ℃ for dissolving for 7 hours to obtain black cellulose/ZrO with the concentration of 46 wt%2NMMO mixed liquor, cellulose/ZrO2Pouring the NMMO mixed solution into a granulation mould for granulation, demoulding after solidification, freezing and drying to obtain the cellulose-ZrO2Compounding aerogel;
s4, preparing the obtained cellulose-ZrO from the step S32Mixing and stirring the composite aerogel and a tannic acid solution with the concentration of 3.2g/L, washing unreacted substances after full reaction, and drying to obtain the tannic acid modified cellulose-ZrO2Compounding aerogel;
s5, dissolving ferric chloride in an ethanol water solution to prepare a ferric chloride solution, and mixing granular modified cellulose-ZrO2Adding the composite aerogel into the ferric chloride solution, reacting and stirring under an anaerobic condition, and then dropwise adding KBH4Solutions of ferric chloride and KBH4,The mass ratio of the micro-nano composite particles to the nano composite particles is 2:3, and micro-nano composite particles are generated through reaction;
s6, adding the micro-nano composite particles into underground water to be treated, wherein the adding amount is 3-35g/L, adjusting the pH value to 5, fully stirring and shaking, and filtering to obtain the treated underground water.
In the embodiment, the input amount of the micro-nano particles is limited, the input amount is 3-35g/L, the pH is 5, the adsorption time is set to be 60min, and the Cr is adsorbed by the micro-nano particles according to the different input amounts as shown in the following table6+Influence of adsorption Effect on Cr when the amount of the catalyst added is too low6+The adsorption effect is poor, but the adsorption effect does not change after a certain amount is reached, so that the data in the following table show that when the micro-nano particles are put into the reactor at a concentration of 7-25g/L, Cr-containing particles are added6+The groundwater has better repairing effect which can be more than 50%.
TABLE 1 influence of micro-nano particles with different input amounts on Cr6+ adsorption effect
Example 5
The other basic data in this example are the same as example 1, the input amount is set to 25g/L, pH is 5, and the adsorption time is set to 10-120min, and it can be seen from the following table that the different input times are different for Cr6+The influence of the adsorption effect is increased along with the increase of the input time, the adsorption effect rises in a straight line, and the influence on the adsorption effect is small after a certain time.
TABLE 2 influence of micro-nano particles with different input amounts on Cr6+ adsorption effect
Example 6
The other basic data in this example are the same as example 2, the input amount is set to 25g/L, the adsorption time is set to 60min, and the pH is set to 3 types of pH, alkaline and neutral, as can be seen from the following table, the adsorption effect is better under a slightly acidic condition, and the adsorption effect is close to that under a neutral condition.
TABLE 2 influence of micro-nano particles with different input amounts on Cr6+ adsorption effect
As can be seen from examples 4 to 6, the optimum amount of the feed, pH and adsorption time were 25g/L, pH was set to 5 to 7 and treatment time was 60min, which all had an effect on the groundwater treatment effect.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A process for repairing chromium-polluted underground water by adopting micro-nano composite particles is characterized by comprising the following steps:
s1, preparing a ZrOCl2 solution with a certain concentration, adding particles capable of decomposing at high temperature, stirring and dipping, then adding ammonia water, reacting in a high-pressure reaction kettle, adding a muffle furnace after the reaction is finished, and firing at high temperature to obtain porous ZrO2A material;
s2, preparing the porous ZrO prepared in the step S12Dissolving the material in NMMO aqueous solvent to obtain ZrO2a/NMMO mixed liquor;
s3, ZrO is used2Preparing cellulose-ZrO by using/NMMO mixed liquor as solvent and bamboo pulp cellulose as cellulose precursor2Compounding aerogel;
s4, preparing the obtained cellulose-ZrO from the step S32Grafting carbonyl or phenolic hydroxyl on the surface of the composite aerogel to obtain surface modified cellulose-ZrO2Compounding aerogel;
s5, preparing the modified cellulose-ZrO prepared in the step S42Loading nano iron on the outer side of the composite aerogel to obtain micro-nano composite particles;
and S6, putting the micro-nano composite particles into underground water to be treated, fully stirring and oscillating, adjusting the pH, and filtering to obtain the treated underground water.
2. The process for remediating chromium-contaminated groundwater using micro-nano composite particles as claimed in claim 1, wherein: the high-temperature decomposition particles in the step S2 are particles which can be decomposed at the temperature of 200-750 ℃, and the diameter of the particles is 100um-2 mm.
3. The process for remediating chromium-contaminated groundwater using micro-nano composite particles as claimed in claim 2, wherein: the pyrolysis particles include various types of wood flour, starch and resin.
4. The process for remediating chromium-contaminated groundwater using micro-nano composite particles as claimed in claim 1, wherein: ZrOCl in the step S12The concentration of the solution is 0.1-0.2mol/L, the temperature in the high-pressure reaction kettle is 120-140 ℃, the reaction time is 20-40h, and the high-temperature ignition temperature is 780-850 ℃.
5. The process for remediating chromium-contaminated groundwater using micro-nano composite particles as claimed in claim 1, wherein: the concentration of the NMMO aqueous solvent in the step S2 is 90-92 wt%, and the porous ZrO22The concentration in NMMO aqueous solvent is 2-5 wt%.
6. The process for remediating chromium-contaminated groundwater using micro-nano composite particles as claimed in claim 1, wherein: in the step S3, the bamboo pulp cellulose is dissolved in ZrO2Heating and vacuumizing the NMMO mixed solution at the temperature of 105-115 ℃ for dissolving for 7 hours to obtain black cellulose/ZrO with the concentration of 2-6 wt%2Mixed solution of/NMMO.
7. The process for remediating chromium-contaminated groundwater using micro-nano composite particles as claimed in claim 1, wherein: cellulose-ZrO in the step S42The process for grafting phenolic hydroxyl on the surface of the composite aerogel comprises the step of grafting cellulose-ZrO2Mixing and stirring the composite aerogel and the tannic acid solution, washing and drying after full reaction to obtain the tannic acid modified cellulose-ZrO2And (3) compounding the aerogel.
8. The process for remediating chromium-contaminated groundwater using micro-nano composite particles as claimed in claim 1, wherein: in the step S5, ferric chloride is dissolved in an aqueous ethanol solution to prepare a ferric chloride solution, and the granular modified cellulose-ZrO2And adding the composite aerogel into the ferric chloride solution, reacting and stirring under an anaerobic condition, then dropwise adding the KBH4 solution, and reacting to generate the micro-nano composite particles.
9. The process for remediating chromium-contaminated groundwater using micro-nano composite particles as claimed in claim 1, wherein: the input amount of the micro-nano composite particles in the underground water to be treated in the step S6 is 7-25 g/L.
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