CN110228825B - Cobaltosic oxide nanosheet for removing arsenic from water body, preparation method and application - Google Patents

Cobaltosic oxide nanosheet for removing arsenic from water body, preparation method and application Download PDF

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CN110228825B
CN110228825B CN201910504758.1A CN201910504758A CN110228825B CN 110228825 B CN110228825 B CN 110228825B CN 201910504758 A CN201910504758 A CN 201910504758A CN 110228825 B CN110228825 B CN 110228825B
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邱建丁
朱晓慧
梁汝萍
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Abstract

The invention relates to the technical field of environmental protection, and particularly discloses a cobaltosic oxide nanosheet for removing arsenic from a water body, and a preparation method and application thereof. The cobaltosic oxide nanosheet (Co)3O4NSs) with CoCl2·6(H2O) is used as a cobalt source, ammonia water is used as a precipitator, and hydrogen peroxide is used as an oxidant, and the catalyst is prepared by a hydrothermal method. The cobaltosic oxide nanosheet provided by the invention has oxidizability, can oxidize high-toxicity As (III) into low-toxicity As (V), and meanwhile, the cobaltosic oxide nanosheet serving as an adsorbent can simultaneously remove As (III) and As (V) in a water body. The method has the advantages of simple preparation method, large adsorption capacity, high removal efficiency, strong anti-interference capability, reproducibility and the like, and can be used as an efficient adsorbent for arsenic in environmental water.

Description

Cobaltosic oxide nanosheet for removing arsenic from water body, preparation method and application
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a cobaltosic oxide nanosheet for removing arsenic from a water body, a preparation method and an application.
Background
Arsenic is one of the constituent elements of the earth crust, widely exists in our lives, has extremely strong toxicity, is located at the 20 th position in the pollutant ranking, and is one of the pollutants preferentially controlled in the water body. The form and valence of arsenic determine the toxicity and physicochemical properties of arsenic, and inorganic arsenic is generally more toxic than organic arsenic. In natural water, arsenic mainly exists in two forms of inorganic arsenic acid As (V) and arsenous acid As (III), when a human body ingests excessive arsenic, acute renal failure, canceration, distortion and other serious diseases can be caused, and the life health of people is seriously influenced. Arsenic contamination is currently a problem throughout the world, with arsenic contamination being particularly acute in Bengal countries, where the arsenic content in many potable water sources exceeds 200ppb, well above the standard limits (10ppb) set by the World Health Organization (WHO) (Adsorption of As (III) and As (V) on colloidal nanoparticles of commercial cross-linked polyamides, J Colloid InterSci, 2016,474, 137-. It is statistical that about 20% of people in Bengal nations die each year from drinking arsenic-containing water, and that countries in China, the United states, India, Pakistan, etc., are also confronted with varying degrees of arsenic contamination (Simultaneous oxidation and sequencing of As (III) from water by using redox polymer-based Fe (III) oxide nanocomposites, J environ Sci Technol,2017,51(11), 6326-. Therefore, how to solve the problem of arsenic pollution in the water body so that the content of the arsenic pollution is lower than the WHO standard limit value has great significance. Among the arsenic removal technologies, the adsorption method has the advantages of simple operation, good stability, large treatment capacity and the like, however, most adsorbents can only effectively remove the negatively charged As (V), but hardly remove the highly toxic and electrically neutral As (III), so that the adsorption of As (III) needs to be pre-oxidized, and the conversion of As (III) to As (V) is very slow in nature (Preparation and evaluation of a novel Fe-Mn binding oxygen sensitive reagent for effective sensitive electrode removal, J.Water Res,2007,41(9),1921 and 1928), so that the removal process of As (III) becomes complicated, and the application of the adsorbents in the arsenic removal field is greatly limited. Therefore, the development of efficient and economical adsorbents for simultaneously removing As (V) and As (III) in water is a difficult problem to be solved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the defects and shortcomings of the existing water body arsenic removal adsorbent, provides a cobaltosic oxide nanosheet for water body arsenic removal, a preparation method and application thereof. The cobaltosic oxide nanosheet provided by the invention has oxidability, can oxidize high-toxicity As (III) into low-toxicity As (V), and meanwhile, the cobaltosic oxide nanosheet can be used as an adsorbent to simultaneously remove As (III) and As (V) in a water body, and has the advantages of simple preparation method, large adsorption capacity, high removal efficiency, strong anti-interference capability, reproducibility and the like. At present, cobaltosic oxide nanosheets (Co) are not seen3O4NSs) for arsenic removal in water.
The invention adopts the following technical scheme to achieve the purpose of the invention.
Firstly, the invention provides a method for removing arsenic from water bodyCobaltosic oxide nanosheet (Co)3O4NSs)。
The cobaltosic oxide nanosheet takes hydrogen peroxide as an oxidant, the precursor cobaltosic oxide is oxidized into cobaltosic oxide precipitate under the hydrothermal condition, and the obtained cobaltosic oxide precipitate is washed and dried to obtain the cobaltosic oxide nanosheet (Co)3O4NSs)。
The precursor cobalt oxyhydroxide as CoCl2.6(H2O) is used as cobalt source and ammonia water is used as precipitator.
The cobaltosic oxide nanosheet (Co)3O4NSs) have oxidizing property, and can oxidize highly toxic As (III) into less toxic As (V); as (III) and As (V) can form a complex with cobaltosic oxide, thereby realizing the high-efficiency adsorption of arsenic.
Secondly, the invention provides cobaltosic oxide nanosheets (Co) for removing arsenic from water body3O4NSs).
The preparation method comprises the following steps: (1) adding CoCl in a molar concentration of 0.03-0.05M2.6(H2O) dissolving in ultrapure water to form a pink solution; (2) slowly dropwise adding ammonia water into the pink solution until the pH value of the solution is 9.0-9.5 to obtain a dark green solution; (3) regulating the temperature of the dark green solution to 75-85 ℃, slowly dripping 1/10 volumes of hydrogen peroxide solution into the solution according to the volume ratio under the condition of continuous stirring, reacting, and cooling to room temperature to obtain suspension; (4) centrifuging the suspension, washing and drying the obtained precipitate to obtain black powder, and preparing cobaltosic oxide nanosheet (Co)3O4NSs)。
The centrifugal separation is performed at the rotating speed of 8000-11000rpm for 3-10 minutes.
The hydrogen peroxide solution has a mass percent concentration of 30%.
And the washing and drying are that the obtained precipitate is subjected to cross washing for a plurality of times by using ultrapure water and ethanol until the pH value is neutral, and the precipitate is dried for 20 to 30 hours in a vacuum drying oven at the temperature of 60 ℃.
Finally, the invention also discloses an application of the cobaltosic oxide nanosheet.
The cobaltosic oxide nanosheet is used for removing arsenic from water.
The water body arsenic removal method comprises the following specific operations: adjusting the pH value of the arsenic-containing water body to be neutral by using acid and alkali, adding cobaltosic oxide nanosheets into the arsenic-containing water body, fully mixing for 20-30h, and filtering the cobaltosic oxide nanosheets through a filter membrane to obtain the arsenic-removed clear water body.
The filter membrane is selected to have the specification of 0.22 mu m.
The maximum adsorption capacity of the cobaltosic oxide nano-sheets to As (III) and As (V) is 56.43mg/g and 33.58mg/g respectively.
The arsenic-containing cobaltosic oxide nanosheet after adsorption can be repeatedly applied to water body for arsenic removal through a regeneration process.
Metal oxides are one of the commonly used adsorption materials, the surface of which is often unsaturated and the lattice oxygen is the adsorption and reaction center. Generally, the degree of adsorption of a metal oxide to a target pollutant is closely related to the type and number of adsorption sites on the surface of an adsorbent, and thus, the adsorption performance of different metal oxides to the target pollutant is greatly different. Cobaltosic oxide (Co)3O4) Is a typical metal oxide, belongs to a P-type semiconductor, and has black or gray black powder, structure and Fe3O4Similarly, it is chemically stable and not readily soluble in water and acids, with a theoretical oxygen content of 26.57% and a cobalt content of 73.43%. At the same time, Co3O4Is also an excellent functional material and has important application in the fields of super capacitors, hard alloys, catalysis, pigments and the like.
In order to realize the simultaneous and efficient removal of As (III) and As (V) in a water body without a complicated pre-oxidation process, the cobaltosic oxide nanosheet (Co nanosheet) prepared by the method3O4NSs) and as an adsorbent for efficient adsorption and removal of arsenic. At present, Co is not yet shown3O4NSs are used for reports of arsenic removal of water bodies.
Has the advantages that:
(1) the invention firstly prepares Co3O4Application of nano material in pairAnd (5) adsorbing and removing arsenic. At present, no report related to the application of cobaltosic oxide nanosheets to arsenic removal of water bodies is found.
(2) Co synthesized by the invention3O4The nanosheets realize the simultaneous removal of As (III) and As (V), and oxidize As (III) into As (V) with lower toxicity, thereby reducing secondary pollution to the environment. Co synthesized by the invention3O4The nano-sheet has oxidation property, can oxidize high-toxicity As (III) into low-toxicity As (V), and the As (V) can react with Co through electrostatic interaction3O4NSs are bound, and both As (III) and As (V) can form a complex with the metal hydroxyl, thereby greatly increasing Co3O4The NSs can adsorb arsenic effectively.
(3) Co synthesized by the invention3O4The nanosheet has good arsenic removal effect in the coexistence of a large amount of anions and a wide pH range, has strong anti-interference capability and good regeneration performance, can be used as a high-efficiency adsorbent for removing arsenic in an environmental water body, and has wide application prospect.
(4) The invention uses CoCl2.6(H2O) is used as a cobalt source, ammonia water is used as a precipitator, hydrogen peroxide is used as an oxidant, and cobaltosic oxide nanosheets (Co) are prepared by a hydrothermal method3O4NSs) is simple in preparation method, stable in structure and capable of realizing large-scale production.
Drawings
FIG. 1: co3O4XRD pattern of NSs.
FIG. 2: co3O4NSs、Co3O4NSs adsorb As (III), Co3O4Infrared spectrum of as (v) adsorbed by NSs.
FIG. 3: co3O4Adsorption isotherm diagrams for NSs adsorbing (A) As (III) and (B) As (V).
FIG. 4: co3O4Adsorption kinetics of NSs for adsorption of (A) As (III) and (B) As (V).
FIG. 5: co-existing anion pair Co3O4Influence of NSs adsorption of (A) As (III) and (B) As (V).
FIG. 6: co3O4Regeneration of NSs is shown in the figure.
Detailed Description
The present invention will be further described with reference to specific examples, but the present invention is not limited to the following examples. The method is a conventional method unless otherwise specified. The starting materials are commercially available from the open literature unless otherwise specified.
Example 1: preparation of cobaltosic oxide nanosheet
0.9517g CoCl2.6(H2O) was dispersed in 100mL of ultrapure water and thoroughly stirred for 10 minutes to allow CoCl2.6(H2O) completely dissolving to form uniform pink solution, slowly dropwise adding ammonia water until the pH value of the solution is 9.2, changing the solution into dark green, continuously stirring for 30 minutes, adjusting the temperature of the solution to 80 ℃ and continuously stirring for 70 minutes, slowly dropwise adding 10mL of 30% hydrogen peroxide solution into the solution during the stirring, cooling to room temperature, centrifuging the obtained suspension at 9500rpm for 5 minutes, cross-washing the obtained precipitate with ultrapure water and ethanol for several times until the pH value is neutral, drying in a vacuum drying oven at 60 ℃ for 24 hours to obtain black powder, and preparing the cobaltosic oxide nanosheet (Co nanosheet)3O4NSs)。
Example 2: preparation of cobaltosic oxide nanosheet
0.714g of CoCl2.6(H2O) was dispersed in 100mL of ultrapure water and thoroughly stirred for 10 minutes to allow CoCl2.6(H2O) completely dissolving to form uniform pink solution, then slowly dripping ammonia water till the pH value of the solution is 9.0, changing the solution into dark green, continuously stirring for 30 minutes, adjusting the temperature of the solution to 75 ℃ and continuously stirring for 60 minutes, slowly dripping 10mL of 30% hydrogen peroxide solution into the solution during the stirring, cooling to room temperature, centrifuging the obtained suspension for 10 minutes at the rotation speed of 8000rpm, cross-washing the obtained precipitate for several times by using ultrapure water and ethanol until the pH value is neutral, drying in a vacuum drying oven at 60 ℃ for 20 hours to obtain black powder, and preparing the cobaltosic oxide nanosheet (Co nanosheet)3O4NSs)。
Example 3: preparation of cobaltosic oxide nanosheet
1.190g of CoCl2.6(H2O) was dispersed in 100mL of ultrapure water and thoroughly stirred for 10 minutes to allow CoCl2.6(H2O) completely dissolving to form uniform pink solution, slowly dropwise adding ammonia water until the pH value of the solution is 9.5, changing the solution into dark green, continuously stirring for 30 minutes, adjusting the temperature of the solution to 85 ℃ and continuously stirring for 90 minutes, slowly dropwise adding 10mL of 30% hydrogen peroxide solution into the solution during the stirring, cooling to room temperature, centrifuging the obtained suspension for 3 minutes at the rotating speed of 11000rpm, cross-washing the obtained precipitate for several times by using ultrapure water and ethanol until the pH value is neutral, drying in a vacuum drying oven at 60 ℃ for 30 hours to obtain black powder, and preparing the cobaltosic oxide nanosheet (Co nanosheet)3O4NSs)。
Example 4: characterization of prepared Co by XRD method3O4Purity and crystallinity of NSs
Characterizing prepared Co by adopting an X-ray diffraction (XRD) method3O4Purity and crystallinity of NSs, FIG. 1 is Co prepared in example 13O4XRD pattern of NSs. As can be seen from FIG. 1, 18.9,31.2,36.8,38.5,44.7,55.6,59.3 at 2 θ。And 65.1。A distinct diffraction peak appears, corresponding to Co3O4With the (111), (220), (311), (222), (400), (422), (511) and (440) planes of Co3O4The standard cards (JCPDSNO.80-1533) are consistent and have no miscellaneous peak, which indicates that the Co prepared by the method of the invention3O4NSs have good purity.
Example 5: co3O4Infrared Spectrum characterization of NSs
In order to explore the adsorption mechanism, infrared spectrum analysis is carried out on the adsorbent and the adsorption condition before and after the adsorbent reacts with arsenic. FIG. 2 shows Co prepared in example 13O4NSs、Co3O4NSs adsorb As (III), Co3O4Infrared spectrum of as (v) adsorbed by NSs. These three samples had 4 common infrared absorption peaks, of which at 3000-1-3600cm-1The broad absorption peak in the range is the oscillation peak of free water molecules, located at 1630cm-1The absorption peak is derived from the bending vibration of water adsorbed on the surface of the adsorbent, 663cm-1And 576cm-1The two absorption peaks are Co3O4The characteristic peak of stretching vibration of Co-O in NSs. And Co3O4NSs compared to, Co3O4After NSs adsorb As (III) or As (V), the concentration is 870cm-1A new absorption peak appears, and the appearance of the peak can be attributed to the stretching vibration of As-O. The infrared spectrum result shows that As (III) and As (V) can be effectively adsorbed on Co3O4The surface of NSs.
Example 6: initial arsenic concentration in solution vs. Co3O4Effect of NSs on adsorption of As (III) and As (V)
In natural environment, the concentration of arsenic varies from region to region and from season to season, so it is necessary to study the Co concentration at different initial concentrations3O4Adsorption effect of NSs on arsenic. The pH of aqueous solutions containing different initial concentrations (5-200ppm) of As (III) and As (V) was adjusted to 7.0 with 0.1M hydrochloric acid or sodium hydroxide solution, and 10mg of Co prepared in example 1 was added3O4NSs were added to 10mL of aqueous solutions containing As (III) and As (V) at different concentrations, respectively, shaken for 24 hours, the mixed solution was filtered through a 0.22 μm filter, the content of arsenic in the filtered clear solution was measured as the adsorption equilibrium concentration by ICP-MS, and the obtained equilibrium concentration and the corresponding adsorption amount were fitted with two isothermal models, Langumir and Freundlich, and the results are shown in FIG. 3. FIG. 3 is a graph showing the variation of the adsorption amount with the arsenic concentration, Co3O4As (III) and As (V) adsorbed by NSs continuously increase with the initial arsenic concentration, and the adsorption rate gradually decreases because of Co3O4The active sites on the surface of NSs are limited and as the concentration of arsenic increases, arsenic occupies Co3O4The active site on the surface of NSs reaches the dynamic equilibrium of adsorption-desorption. The fit shows that Langumir has a linear correlation coefficient R, whether As (III) or As (V)2Both are greater than Freundlich, indicating Co3O4The adsorption of As (III) and As (V) by NSs conforms to the Langumir adsorption isotherm, demonstrating that Co3O4The adsorption of As (III) and As (V) by NSs is monolayer adsorption. Both As (III) and As (V) have Freundlich constants of less than 0.5, indicating that Co3O4The adsorption of arsenic by NSs occurs spontaneously. Co3O4The maximum adsorption capacities of NSs for As (III) and As (V) were 56.43mg/g and 33.58mg/g, respectively. The above results show that Co prepared by the method of the present invention3O4NSs is a high-efficiency arsenic adsorbent, and has large adsorption capacity and wide applicable concentration range.
Example 7: adsorption time to Co3O4Effect of NSs on adsorption of As (III) and As (V)
Exploration of the adsorption amount of the adsorbent to arsenic in the retention time of the adsorption reaction is carried out by measuring3O4Kinetics of arsenic adsorption by NSs. In the present invention, a series of aqueous As (III) and As (V) solutions with an initial concentration of 20ppm by volume of 10mL were prepared, and the pH of the arsenic-containing aqueous solution was adjusted to 7 with 0.1M hydrochloric acid or sodium hydroxide solution, followed by the addition of 10mg of Co prepared in example 13O4NSs, adsorbed at room temperature for 5-2880min with shaking, the mixed solution was filtered through a 0.22 μm filter, and the arsenic content in the resulting clear solution was measured by ICP-MS, as shown in FIG. 4. The adsorption process can be divided into two stages: in the first stage, Co3O4As (III) and As (V) are adsorbed by NSs very quickly, and the removal rate of As (III) and As (V) reaches 52.2 percent and 59.4 percent respectively in 1 hour; in the second stage, the adsorption rate is slowed and takes 6-12 hours to reach adsorption equilibrium. Therefore, the adsorption time for the adsorption experiment was 24 hours in order to ensure complete adsorption. Longer time required for complete adsorption indicates Co3O4The adsorption of arsenic by NSs is not entirely electrostatic. In addition, the adsorption kinetic results are fitted by using a pseudo first order kinetic equation and a pseudo second order kinetic equation, and the correlation coefficient of a pseudo second order kinetic model is high (R)2>0.99), showing that As (III) and As (V) are adsorbed to Co3O4On NSs is the chemisorption process. As (III) and As (V) have adsorption rate constants of 0.00121g mg-1min-1And 0.00541g-1min-1As (V) has an adsorption rate constant 4.5 times that of As (III), indicating that Co3O4As (V) is adsorbed more rapidly by NSs than by As (III).
Example 8: co-existing ion pair Co3O4NSs adsorptionInfluence of As (III) and As (V)
The components in natural water bodies are complex and contain a large number of other ions in addition to the target ions, some of which may affect the adsorption of the adsorbate by the adsorbent. From the practical point of view, it is necessary to study the influence of the coexisting anions on arsenic adsorption. Thus, Cl was examined-，SO4 2-，HCO3 -And PO4 3-Etc. ions present at different concentrations (20ppm, 200ppm, 1000ppm) on Co prepared in example 13O4NSs remove the effects of As (III) and As (V). As can be seen in FIG. 5, Cl-、HCO3 -Co prepared in example 13O4The adsorption of As (III) and As (V) by NSs is hardly affected, and SO is contained in a high concentration4 2-To Co3O4As (V) adsorption by NSs has a slight influence, PO4 3-To Co3O4The effect of NSs on the adsorption of As (III) and As (V) is greater. When PO is in solution4 3-At a concentration of 1000ppm, Co3O4The removal efficiency of NSs for As (III) and As (V) is reduced to 20.25% and 12.05%, respectively, because phosphorus and arsenic belong to group V elements in the periodic table, and the two elements have similar oxyacid properties, PO4 3-Will compete with arsenic for Co3O4Active adsorption sites on the nanoplatelets. The above results show that Co prepared by the method of the present invention3O4The NSs has the advantage of strong anti-interference capability on the adsorption of arsenic.
Example 9: co3O4Regeneration of NSs
The exploration of the desorption application of the adsorbent is an important index for improving the recovery utilization rate, can improve the economic utilization value of the adsorbent and promote the development of the environmental protection effect. To explore Co3O4Regeneration of NSs Co that will adsorb some amount of arsenic3O4NSs is put into NaOH solution with the concentration of 0.5M, shaken for 24h, eluted and adsorbed on Co3O4Arsenic on NSs, centrifuging to remove the eluent and washing with ultrapure water to Co3O4NSs is neutral, and oven drying at 60 deg.C in vacuum drying ovenAnd drying and carrying out the next arsenic adsorption experiment. FIG. 6 shows regenerated Co3O4Arsenic removal effect of NSs at an initial arsenic concentration of 20 ppm. Co3O4After NSs passes through five times of adsorption-desorption cycles, along with the increase of the recycling times of the adsorbent, the removal effect of the adsorbent on arsenic does not show a trend of obvious attenuation, and the difference from the first round of adsorption capacity is small, which shows that most of arsenic can still be regenerated by the regenerated Co3O4Effective removal of NSs, Co after five adsorption-desorption cycles3O4The removal rate of As (III) and As (V) by NSs is 75.33% and 49.75%, respectively. The reason for the slight decrease in the amount of adsorption may be due to partial loss of active functional groups on the surface of the adsorbent after undergoing multiple adsorption-desorption or incomplete desorption with the originally adsorbed arsenic occupying the active sites. The results show that the 0.5M NaOH resolving agent is properly selected and can be selected from Co3O4The NSs surface efficiently desorbs the adsorbed arsenic. In conclusion, the Co prepared by the method of the invention3O4NSs has good recycling performance and high stability, and is expected to be continuously and efficiently used for treating arsenic-polluted water body.
Example 10: co3O4Small experiment for applying NSs to adsorption removal of arsenic-containing water
Arsenic-containing water sample: sampling untreated arsenic-containing wastewater of a certain mine, and detecting that the content of As (III) in the wastewater is 0.021mg/L, As (V) and the content of As (III) is 0.014 mg/L: in addition, the wastewater also detects Cl content-Is 0.186mg/L, SO4 2-0.124mg/L, HCO3 -Is 0.085mg/L and PO4 3-Is 0.038 mg/L.
Co3O4Adsorption of NSs to remove arsenic: taking 1L of the arsenic-containing wastewater, adjusting the pH of the arsenic-containing wastewater to be neutral by using 0.1M hydrochloric acid or sodium hydroxide solution, and adding 10mgCo prepared in example 13O4NSs, oscillating for 24h to remove arsenic by adsorption, and filtering by using a filter membrane with the pore diameter of 0.22 mu m to obtain a clarified water sample after arsenic removal treatment. The content of As (III) in the clarified water sample after arsenic removal treatment is 0.002mg/L, As (V) and 0.0012mg/L, and Cl is detected-、SO4 2-、HCO3 -Substantially maintains the original concentration of PO4 3-The content of (b) is reduced to 0.021 mg/L.
And (4) conclusion: the calculated removal rate of As (III) in the experiment reaches 90.48 percent, and the removal rate of As (V) reaches 91.43 percent. The cobaltosic oxide nanosheet provided by the invention has high-efficiency adsorption effect on As (III) and As (V) in a water body as an adsorbent, and has the advantages of large adsorption capacity, high removal efficiency and strong anti-interference capability.
Similarly, the cobaltosic oxide nanosheets prepared in example 2 and the cobaltosic oxide nanosheets prepared in example 3 were subjected to the same procedures as in examples 4 to 10, and the results of the tests and experiments were substantially the same as those of examples 4 to 10 which were carried out on the cobaltosic oxide nanosheets prepared in example 1.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the above-described embodiments. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent alterations and modifications are intended to be included within the scope of the invention, without departing from the spirit and scope of the invention.

Claims (6)

1. An application of cobaltosic oxide nanosheets in arsenic removal of water bodies is characterized in that: the preparation method of the cobaltosic oxide nanosheet comprises the following steps: (1) adding CoCl in a molar concentration of 0.03-0.05M2.6(H2O) dissolving in ultrapure water to form a pink solution; (2) slowly dropwise adding ammonia water into the pink solution until the pH value of the solution is 9.0-9.5 to obtain a dark green solution; (3) regulating the temperature of the dark green solution to 75-85 ℃, slowly dripping hydrogen peroxide solution with the volume of 1/10 of the dark green solution into the solution according to the volume ratio under the condition of continuous stirring, reacting, and cooling to room temperature to obtain suspension; (4) and (4) centrifugally separating the suspension, washing and drying the obtained precipitate to obtain black powder, and preparing the cobaltosic oxide nanosheet.
2. The application of cobaltosic oxide nanosheets in arsenic removal in water bodies according to claim 1, wherein: the centrifugal separation is performed at the rotating speed of 8000-11000rpm for 3-10 minutes.
3. The application of cobaltosic oxide nanosheets in arsenic removal in water bodies according to claim 1, wherein: the hydrogen peroxide solution has a mass percent concentration of 30%.
4. The application of cobaltosic oxide nanosheets in arsenic removal in water bodies according to claim 1, wherein: and the washing and drying are that the obtained precipitate is subjected to cross washing for a plurality of times by using ultrapure water and ethanol until the pH value is neutral, and the precipitate is dried for 20 to 30 hours in a vacuum drying oven at the temperature of 60 ℃.
5. The application of cobaltosic oxide nanosheets in arsenic removal in water bodies according to claim 1, wherein: the water body arsenic removal method comprises the following specific operations: adjusting the pH value of the arsenic-containing water body to be neutral by using acid and alkali, adding cobaltosic oxide nanosheets into the arsenic-containing water body, fully mixing for 20-30h, and filtering the cobaltosic oxide nanosheets through a filter membrane to obtain the arsenic-removed clear water body.
6. The application of cobaltosic oxide nanosheets in arsenic removal in water bodies according to claim 5, wherein: the filter membrane is selected with the specification of aperture 0.22 μm; the maximum adsorption capacity of the cobaltosic oxide nano-sheets to As (III) and As (V) is 56.43mg/g and 33.58mg/g respectively.
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