KR102340538B1 - Composite for removing inorganic pollutants and its preparation method, and adsorption removal method of inorganic pollutant in water using the same - Google Patents

Abstract

The present invention relates to a composite for removing inorganic pollutants, a manufacturing method thereof, and a method for adsorbing and removing inorganic pollutants in water using the same, and more particularly, to a porous material capable of removing various inorganic pollutants by including a conductive polymer and hexagonal boron nitride of the complex and a method for manufacturing the same, and to a method for adsorption and removal of inorganic pollutants in water using such a complex.
The present invention provides a complex for removing inorganic pollutants, a method for manufacturing the same, and a method for adsorbing and removing inorganic pollutants in water using the same, so that various anionic inorganic pollutants can be simultaneously removed, and interaction with inorganic pollutants is easy to adsorb It has high reactivity, high mechanical strength, and a large usable surface area, so it can exhibit an efficient and excellent effect of removing contaminants.

Description

Composite for removing inorganic pollutants and its preparation method, and adsorption removal method of inorganic pollutant in water using the same}

The present invention relates to a composite for removing inorganic pollutants, a manufacturing method thereof, and a method for adsorbing and removing inorganic pollutants in water using the same, and more particularly, to a porous material capable of removing various inorganic pollutants by including a conductive polymer and hexagonal boron nitride of the complex and a method for manufacturing the same, and to a method for adsorption and removal of inorganic pollutants in water using such a complex.

Due to the rapid industrialization and urban development of modern society, a large amount of sewage is generated and discharged from homes and industrial sites, which is extensively damaging our aquatic environment. Sewage is usually discharged into the natural environment loaded with heavy metal ions or micronutrients.

Phosphate and nitrate are widely known as essential trace elements that promote disease prevention and biomass growth and energy transport, but when exposed to excessively high concentrations, these micronutrients cause methemoglobinemia and fatal problems in organs such as liver and kidneys. may occur. In addition, when the levels of phosphate and nitrate in the aquatic environment are high, it can cause water pollution problems such as eutrophication and algal blooms, which can cause ecosystem destruction.

Among heavy metals classified as pollutants, chromium, widely used in metal washing, dyeing, leather treatment, electroplating, and mining industries, is a toxic pollutant that causes water pollution in the aquatic environment. There are two oxidation states of chromium ions. Exposure to large amounts of chromium can cause health problems such as vomiting, nausea, horse racing, bleeding, and severe diarrhea. In particular, hexavalent chromium ion is carcinogenic, mutagenic, and toxic compared to trivalent chromium ion. It is known to be 10 to 1000 times higher and its water soluble properties can cause very serious problems.

Various technologies have been researched and developed as a purification method to control the concentration of these pollutants. A method of removing toxic pollutants from water mainly using precipitation, electrocoagulation, reverse osmosis/nanofiltration, membrane treatment, and adsorption. have been used In particular, the adsorption of pollutants using an adsorbent has the advantages of high efficiency, cost reduction, and easy operation, so it is evaluated as the most suitable method for detoxification of pollutants in an aquatic environment.

Accordingly, 'Korea Patent Publication No. 10-2017-0164988' discloses a method for adsorbing chromium ions for water treatment and a method for manufacturing the same, and a method for manufacturing a new chromium ion adsorbent using a carbon material and pyrrole nitrogen and an adsorbent However, it does not disclose the removal or adsorption of other contaminants other than chromium ions, and only chromium can be adsorbed. There is a problem that

(Patent Document 1) KR 10-2017-0164988 A (Patent Document 2) KR 10-2019-0096935 A

In order to solve the above problems, an object of the present invention is to provide a composite for removing inorganic contaminants that is composed of a conductive polymer and hexagonal boron nitride and can adsorb and remove various inorganic contaminants.

Another object of the present invention is to provide a method for manufacturing a composite for removing inorganic contaminants.

Another object of the present invention is to provide a method for adsorbing and removing inorganic pollutants in water using a complex for removing inorganic pollutants.

The present invention in order to solve the above object,

at least one conductive polymer selected from polyacetylene, polyparaphenylene vinylene, polypyrrole and polyaniline; and

Including; hexagonal boron nitride forming a covalent bond with the conductive polymer;

It provides a composite for removing inorganic contaminants, characterized in that it includes nanometer-sized pores.

The inorganic contaminant is one selected from phosphate, nitrate, nitrite, silicate, arsenic, and chromium, and the complex has a positive charge. The size of the pores is characterized in that 1 to 100 nm.

The present invention in order to solve the other object,

A first step of adding a conductive polymer to an acidic solution to form a conductive polymer solution;

a second step of reacting the conductive polymer solution and hexagonal boron nitride to form a reactant; and

A third step of neutralizing the reactant to form a neutralized reactant; provides a method for manufacturing a composite for removing inorganic contaminants, comprising:

In the third step, one or more neutralizing agents selected from ammonium persulfate, sodium chlorite and hydrogen peroxide are added, and the preparation method further comprises one or more steps selected from filtering, washing, and drying the neutralized reactant. .

In order to solve the above another object, the present invention provides a method for adsorbing and removing inorganic pollutants in water using a composite for removing inorganic pollutants.

The present invention provides a complex for removing inorganic pollutants, a method for manufacturing the same, and a method for adsorbing and removing inorganic pollutants in water using the same, so that various anionic inorganic pollutants can be simultaneously removed, and interaction with inorganic pollutants is easy to adsorb It has high reactivity, high mechanical strength, and a large usable surface area, so it can exhibit an efficient and excellent effect of removing contaminants.

1 is a view showing an adsorption mechanism of an inorganic contaminant complex according to an embodiment of the present invention.
2 is a graph showing the FTIR analysis results of the composite, h-BN, and Pani according to an embodiment and a comparative example of the present invention.
3 is a graph showing the XRD analysis results of the composite, h-BN, and Pani according to an embodiment and a comparative example of the present invention.
4 is a graph showing the XPS analysis results of the complex, h-BN, and Pani according to an embodiment and a comparative example of the present invention.
5A is an FE-SEM image of a composite and h-BN according to an embodiment and a comparative example of the present invention.
Figure 5b is a HR-TEM image of the composite and h-BN according to an embodiment and a comparative example of the present invention.
_{6 is a graph showing N 2} adsorption-desorption isotherms and pore sizes of composites, h-BN, and Pani according to an embodiment and a comparative example of the present invention.
7A is a graph showing the adsorption rate of inorganic contaminants of the composite and h-BN according to an embodiment and a comparative example of the present invention and the degree of adsorption of inorganic contaminants according to time of the composite according to an embodiment of the present invention.
7B is a graph showing the degree of adsorption of inorganic contaminants according to the solution pH of the complex according to an embodiment of the present invention.
7c is a graph showing the inorganic contaminant removal efficiency of the composite, h-BN, and Pani according to an embodiment and a comparative example of the present invention.
8 is a graph showing FTIR analysis results before and after adsorption of inorganic contaminants of the composite according to an embodiment of the present invention.

In the present specification, when a part "includes" a certain component, this means that other components may be further included rather than excluding other components unless otherwise stated. And the terminology used in this specification is for describing the embodiments, and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a composite for removing inorganic pollutants, a manufacturing method thereof, and a method for adsorbing and removing inorganic pollutants in water using the same.

According to one aspect, the present invention provides at least one conductive polymer selected from polyacetylene, polyparaphenylene vinylene, polypyrrole and polyaniline; and hexagonal boron nitride forming a covalent bond with the conductive polymer.

In the composite for removing inorganic contaminants of the present invention, hexagonal boron nitride (h-BN) has excellent thermal stability and mechanochemical properties through various dimensional arrangements, and has a high specific surface area, so it can serve as an ideal adsorbent. have. However, despite these excellent properties, hexagonal boron nitride may have limitations in showing significant contaminant adsorption efficiency only with its original structure or shape. As an example, since hexagonal boron nitride is negatively charged in a neutral condition, there may be a limit to adsorption and removal by electrical attraction of negatively charged materials. In addition, in hexagonal boron nitride, active functional groups may be easily separated under water-soluble conditions, and thus, it may be difficult to exhibit adsorption efficiency in water.

Conductive polymers can be applied in various fields such as energy storage, plastic batteries, and optical storage devices due to their multifunctionality, environmental stability, surface area, porosity, ease of synthesis, and physicochemical properties of conductivity. In the composite for removing inorganic contaminants of the present invention, any conductive polymer may be used as long as it has excellent processability and exhibits conductivity properties capable of conducting electricity, but is preferably polyacetylene, polyparaphenylene vinylene, or polypyrrole. and polyaniline. In particular, polyaniline (Pani) is one of the polymers with good adsorption capacity and good physicochemical properties. However, polyaniline may have low adsorption efficiency in water because its specific surface area, which is one of the important properties to have as an adsorbent, is relatively small compared to hexagonal boron nitride.

In the composite for removing inorganic contaminants of the present invention, the conductive polymer and the hexagonal boron nitride may be connected or bonded by a covalent bond, and the conductive polymer may be located in the hexagonal boron nitride. More specifically, the conductive polymer may be located in the composite for removing inorganic contaminants, and may be located inside the composite in the form of amorphous particles surrounded by hexagonal boron nitride. In addition, by the cross-bonding of hexagonal boron nitride and a conductive polymer, the composite of the present invention may exhibit porous properties such as a network structure, may exhibit mesoporous properties, and may include nanometer-sized pores. have.

In the present invention, the inorganic contaminant is anionic and may include any material as long as it has an electrical attraction with a material having a positive charge, but is preferably one selected from phosphate, nitrate, nitrite, silicate, arsenic, and chromium. or more, and more preferably phosphate, nitrate, and chromium. In this case, the chromium may be hexavalent chromium, and this hexavalent chromium may be removed by being adsorbed into the complex of the present invention, rather than being reduced to trivalent chromium.

The composite for removing inorganic contaminants of the present invention, which is porous and includes nanometer-sized pores, may have a size of 1 to 100 nm, preferably 2 to 50 nm. The adsorption efficiency of the inorganic contaminants of the composite of the present invention may be improved by these pores.

According to another aspect, the present invention provides a first step of adding a conductive polymer to an acidic solution to form a conductive polymer solution; a second step of reacting the conductive polymer solution and hexagonal boron nitride to form a reactant; and a third step of neutralizing the reactant to form a neutralized reactant.

In the method for manufacturing the composite for removing inorganic contaminants of the present invention, the conductive polymer solution can be formed using an acidic solution to improve dispersibility using electrical repulsion, and when the reactant of the conductive polymer solution and hexagonal boron nitride is formed in water A reactant can be formed through the process of adding a conductive polymer to the dispersed hexagonal boron nitride solution.

In the third step of neutralizing the reactants, one or more neutralizing agents selected from ammonium persulfate, sodium chlorite, and hydrogen peroxide may be added to neutralize the reactants, and through this neutralization process, a complex having a molecular weight ratio between the required reactants can be formed In addition, after the neutralization process of the reactant, one or more processes selected from filtering, washing, and drying the neutralized reactant may be further included, thereby forming a particle-shaped complex.

In the method for manufacturing the composite for removing inorganic pollutants of the present invention, the conductive polymer, hexagonal boron nitride, and the composite for removing inorganic pollutants are the same as or similar to those described above with respect to the composite for removing inorganic pollutants of the present invention. decide to do

According to another aspect, the present invention provides a method for adsorbing and removing inorganic pollutants in water using a composite for removing inorganic pollutants.

1 below is a schematic diagram of a mechanism for adsorption and removal of inorganic contaminants in water of the inorganic contaminant complex of the present invention. , inorganic contaminants may be adsorbed and removed through one or more mechanisms or processes selected from ionization and complexation.

The description of the complex for removing inorganic contaminants used in the method for adsorption and removal of inorganic contaminants in water of the present invention is the same as or similar to the above-described description of the complex for removing inorganic contaminants of the present invention, and thus will be omitted.

The present invention will be described in more detail by the following examples. However, the following examples are intended to illustrate the present invention, and the scope of the present invention is not limited by the examples. It is provided to complete the disclosure of the present invention, and to completely inform those of ordinary skill in the art to which the present invention pertains to the scope of the invention.

<Example>

Example 1 - Preparation of Inorganic Contaminant Composite (1 wt%)

After dissolving boric acid and urea in 80 ml distilled water at a molecular ratio of 1:4, the mixture was stirred for about 3 hours at 70°C until the water evaporated, and then the obtained precipitate was transferred to a quartz boat in a tube furnace (GSL-1100X tube furnace (MTI) Corp., CA, USA)) under N ₂ atmospheric conditions at 90° C. for 9 h. After heating, the resulting reactant was washed and dried at 70° C. for 6 hours to finally synthesize hexagonal boron nitride (h-BN).

5 g of the thus synthesized hexagonal boron nitride (h-BN) was dispersed in 100 ml of distilled water and stirred for 2 hours, and polyaniline was added to 0.05 g (1 wt%, h-BN: aniline weight ratio = 100:1) in HCl solution. ) was added and mixed with continuous stirring, and then this was added dropwise to the h-BN solution to form a reaction mixture. Then, an ammonium persulfate solution was added to the reaction mixture to undergo a neutralization process, and the mixture was stirred continuously for 5 hours to obtain a homogeneous suspension. The homogeneously mixed reaction mixture was separated with a vacuum filter, washed, and dried at 80° C. for 6 hours to finally prepare an inorganic contaminant complex in which hexagonal boron nitride and polyaniline were combined.

Example 2 - Preparation of Inorganic Contaminant Composite (2 wt%)

An inorganic contaminant complex was prepared in the same manner as in Example 1 by adding 2 wt% of polyaniline (h-BN:aniline weight ratio = 100:2).

Example 3 - Preparation of Inorganic Contaminant Composite (5 wt%)

Polyaniline was added in 5 wt% (h-BN:aniline weight ratio = 100:5) to prepare an inorganic contaminant complex in the same manner as in Example 1.

Comparative Example 1 - Hexagonal boron nitride (h-BN) synthesis

Hexagonal boron nitride was synthesized in the same manner as in Example 1 and used as a comparative example.

Comparative Example 2 - Synthesis of polyaniline (Pani)

In the same manner as in Example 1, polyaniline was synthesized alone without hexagonal boron nitride and used as a comparative example.

For ease of description in the specification, the inorganic contaminant complex prepared according to Example 1 is h-BN@1%Pani, the inorganic contaminant complex prepared according to Example 2 is h-BN@2%Pani, and The inorganic contaminant complex prepared according to Example 3 was named h-BN@5%Pani.

<Experimental example>

Experimental Example 1 - FTIR analysis test

In order to comparatively analyze the functional groups of the inorganic contaminant complex according to the embodiment and the comparative example, the Fourier-Transform Infrared Spectroscopy (FTIR) technique was used in the ^{frequency range of 400 to 4,000 cm -1} Transmission mode using a Jasco-460 Plus FTIR spectrophotometer was analyzed.

Experimental Example 2 - PXRD analysis test

Powder X Ray Diffraction (PXRD, (RIGAKU, D/ Max-2500)) pattern was analyzed.

Experimental Example 3 - XPS analysis test

In order to confirm the element arrangement of the inorganic contaminant complex according to the above example and the comparative example, and to confirm the elemental composition before and after adsorption of inorganic contaminants, an instrument equipped with a monochromatic Al Kα X-ray source operating at 200 W (ESCA 5800, ULVAC -PHI Inc., Kanagawa, Japan) was used to analyze XPS.

Experimental Example 4 - Analysis of surface morphology

Experimental Example 4-1 - FE-SEM analysis test

In order to confirm the shape of the surface of the inorganic contaminant composite according to the above example and the comparative example, FE-SEM (Hitachi SU8220, Japan) was used and observed at a magnification of 8000 to 20000 times.

Experimental Example 4-2 - HR-TEM analysis test

In order to confirm the structural arrangement, shape, and particle size of the inorganic contaminant composite according to the above Examples and Comparative Examples, HR-TEM (JEOL JEM-2100F, Japan) was used to observe at a magnification of 80,000 to 300,000 times.

Experimental Example 5 - Specific surface area analysis test

Quadrasorb SI-MP porosimeter (Quantachrome, FL, USA) was used to analyze the specific surface area and pore (pore) size of the inorganic contaminant complex according to the above Examples and Comparative Examples. _{Each N 2} adsorption-desorption isotherm was obtained by vacuum treatment at 200° C. for 5 hours.

Experimental Example 6 - Batch Adsorption Experiment

After preparing the inorganic contaminant complex according to the above Example and h-BN of Comparative Example 1 at a concentration of 1 g/L, 10 ml of a 100 mg/L concentration of phosphate, nitrate, and hexavalent chromium solutions were each freed by 15 ml prepared in a bottle. The composite of Example and h-BN of Comparative Example 1 were added to a glass bottle in which each inorganic contaminant was prepared, and mixed at a speed of 150 rpm using a stirrer to react with the contaminant. Thereafter, the composite of Example and h-BN of Comparative Example 1, which were used as adsorbents, were separated from the reactants using a 0.22 μm membrane filter, and the degree of adsorption was analyzed by checking the residual concentration of contaminants in the filtered reactants.

At this time, in order to check the effect according to the contact time between the adsorbent and the contaminant, the adsorption removal rate was analyzed at a time interval of 0 to 600 minutes. The adsorption behavior was investigated as a function of pH using NaOH solution. The residual concentration of each contaminant was confirmed by measuring phosphate, nitrate, and hexavalent chromium spectrophotometrically at wavelengths of 400, 202, and 504 nm, respectively.

In addition, in order to confirm the adsorption removal rate for the inorganic contaminants of the inorganic contaminant complex according to the above example and the comparative example, when the initial concentrations of phosphate, nitrate, and hexavalent chromium were 10 mg/L, 1 g/L of 1 g/L was applied for 5 minutes. Removal rates of inorganic contaminants were compared and analyzed by reacting each material at a concentration (150 rpm).

<Evaluation and Results>

Result 1 - FTIR analysis test result

The functional groups of the composite according to the above example, h-BN and Pani according to the comparative example were confirmed according to Experimental Example 1, and the results are shown in FIG. 2 .

In h-BN according to Comparative Example 1, ^{significant peaks were confirmed at 1361 cm -1 indicating in-plane stretching vibration of BN and 790 cm -1} indicating in-plane BNB bending vibration, and in Pani according to Comparative Example 2, NH stretching ^{A peak was confirmed at 3435 cm -1} indicating the mode, and significant peaks were confirmed at ^{1573 cm -1} and 1491 cm ^-1 indicating the quinoid and benzene ring characteristics of the Pani compound, respectively, and CC stretching vibrations. Also confirmed the absorption band of 1122 cm ^-1 and 809 cm ^-1 indicating the 1290cm ^-1 and CH absorption band bending mode other than the in-plane and each plane due to CN stretching vibration.

h-BN@1%Pani, h-BN@2%Pani, and h-BN@5%Pani according to Examples showed typical absorption bands of precursors, and showed a slightly shifted form from the original peak. This is a result indicating that h-BN and Pani formed a complex through strong interaction due to the interaction between functional groups in the molecule. This is a result indicating that this has been done successfully.

In addition, it was confirmed that a complex containing various functional groups was created by compensating for the lack of surface functional groups of h-BN, which shows only peaks corresponding to the stretching vibration of BN and the bending vibration of BNB, through synthesis with Pani, a multifunctional conductive polymer. could

Result 2 - PXRD analysis test result

The crystal structures of the composite according to the Example and h-BN and Pani according to the Comparative Example were confirmed according to Experimental Example 2, and the results are shown in FIG. 3 .

In the case of h-BN, significant diffraction peaks were exhibited at 26.01° and 42.04°, and high-purity semi-crystalline properties and a layer arrangement with an interlayer distance of 2.5 Å were exhibited. This means that the synthesis of h-BN according to Examples and Comparative Examples was successfully performed. In the case of Pani, main diffraction peaks were exhibited at 15.76°, 20.35°, and 26.25°, and individual peak forms of h-BN and Pani could not be confirmed in the composite according to Examples. This means that the Pani hybrid complex was synthesized in a masked form within the h-BN complex.

Result 3 - XPS Analysis Test Results

The element arrangement of the composite h-BN@5%Pani according to the above example was confirmed according to Experimental Example 3, and the result is shown in FIG. 4 .

In the XPS spectrum of h-BN@5%Pani, boron, carbon, nitrogen, and oxygen bands were confirmed. Looking at each band, in the case of boron, 190.65 and 191.96 eV peaks corresponding to the bonds of BN and BO, respectively, were confirmed, and in the case of carbon, they correspond to the bonds of CC/C=C, CN, CO, and OC=O, respectively 284.6/285.4, 286.1, 287.3, and 289.9 eV peaks could be identified, and 400.8 and 401.78 eV peaks corresponding to -NH- and =N- groups for nitrogen were identified, respectively, and C=O for oxygen, 530.6, 531.6, and 533.5 eV peaks corresponding to the C-OH and COC groups, respectively, were identified.

Result 4 - Surface Morphology Analysis Test

The surface morphology of the composite h-BN@5%Pani according to the above example and the h-BN of the comparative example was confirmed according to Experimental Examples 4-1 and 4-2, and the surface photos are shown in FIGS. 5a to 5b. shown.

As a result of confirming Fig. 5a showing the FE-SEM measurement image, it was found that h-BN (A and B in Fig. 5A) exhibited a disk-shaped arrangement and was porous, and h-BN@5%Pani (C in Fig. 5A) and D) showed a tubular matrix structure.

As a result of confirming Fig. 5b showing the HR-TEM measurement image, it was found that h-BN (A and B of Fig. 5b) exhibited a highly ordered aggregated particle shape, and h-BN@5%Pani (Fig. 5b). In C and D), it was found that Pani was located deeply in the complex and was present in a lower ratio than that of h-BN. In addition, comparing the SAED patterns of h-BN and h-BN@5%Pani, it can be confirmed that they are different, and it can be confirmed that the h-BN@5%Pani complex exhibits amorphous or semi-crystalline properties.

Result 5 - Specific Surface Area Analysis Test Results

The specific surface area and pore size of the composite h-BN@5%Pani according to the Example and h-BN and Pani according to the Comparative Example were confirmed according to Experimental Example 5, and the results are shown in FIG. 6 .

Referring to the hysteresis curve of A in FIG. 6, the composites h-BN@5%Pani, h-BN and Pani all have curves corresponding to IUPAC type IV, and through this, it can be confirmed that the materials have characteristics of a porous material. there was. In addition, it was confirmed that the composites h-BN@5%Pani, h-BN and Pani had ^{specific surface areas of 50.0, 263.7, and 43.3 m 2 /g, respectively.}

As a result of examining the porosity of the composite based on the pore size distribution of the composite, it was confirmed that h-BN had several relatively weak peaks with a wide pore size distribution ranging from 0 to 80 nm. It was found that mesoporous abundance exists. It was found that even in the case of Pani and h-BN@5%Pani, similar to h-BN, it exhibited certain mesoporous properties without characteristic peaks.

As a result, the specific surface area of h-BN@5%Pani was higher than that of Pani and lower than that of h-BN, which means that Pani was synthesized by effectively crossing h-BN, and a composite with excellent surface area and porosity properties. means that it has been formed. This property is essential for adsorption of inorganic contaminants, and is a result showing that the inorganic contaminant removal efficiency of the composite according to the present invention will be excellent.

Results 6 - Results of Batch Adsorption Experiments

The degree of adsorption of inorganic contaminants of the composite according to the Example and the degree of adsorption of inorganic contaminants of h-BN and Pani according to the Comparative Example according to Experimental Example 6 was confirmed according to the time and pH, and the results are shown in FIGS. 7A and 7C shown in

The adsorption degree of inorganic contaminants phosphate, nitrate and hexavalent chromium of h-BN@1%Pani, h-BN@2%Pani, h-BN@5%Pani according to Examples and h-BN according to Comparative Examples As a result (A of FIG. 7A ), the composite of Example exhibited superior adsorption power to all anionic inorganic pollutants than h-BN, and it was found that the higher the concentration of Pani in the composite, the better the adsorption power of pollutants. It was confirmed that h-BN had a weak electron affinity for anionic contaminants as the active functional group was separated under water-soluble conditions and the surface was negatively charged. It was confirmed that the degree of adsorption of anionic contaminants was increased while exhibiting positively charged characteristics. These h-BN@1%Pani, h-BN@2%Pani, and h-BN@5%Pani have the _{same functional groups as NH 2} , BN, and thus anionic species through electrostatic attraction, ion exchange, and surface complexation mechanisms. can be strongly attracted and adsorbed.

As a result of checking the adsorption degree of inorganic pollutants phosphate, nitrate and hexavalent chromium according to time of h-BN@5%Pani, which showed the best adsorption capacity (FIG. 7B), when all inorganic pollutants reached the saturation state It was confirmed that adsorption continued until

As a result of confirming the adsorption degree of inorganic contaminants phosphate, nitrate and hexavalent chromium of h-BN@5%Pani according to the pH of the solution known to affect the adsorption of inorganic contaminants (Fig. 7b), the complex under acidic conditions It was confirmed that the surface charge of , showed the highest adsorption efficiency due to the strong positive charge characteristics.

Finally, adsorption removal rate for phosphate, nitrate, and hexavalent chromium of h-BN@1%Pani, h-BN@2%Pani, h-BN@5%Pani, and h-BN and Pani according to Comparative Examples according to Examples As a result of confirming (Fig. 7c), it was found that the adsorption and removal rates for inorganic contaminants of h-BN@5%Pani were about 1.5, 1.7, and 3.4 times superior to that of h-BN, which is a comparative example, and compared to h-BN, which is a comparative example, h -BN@5%Pani showed that the adsorption and removal rates for inorganic pollutants were 1.6, 1.9, and 1.5 times superior.

Result 7 - FTIR comparative analysis result before and after adsorption of inorganic pollutants

In order to compare and confirm the functional group change before and after adsorption of the inorganic contaminants of h-BN@5%Pani according to the above example, the FTIR spectrum was checked according to Experimental Example 1, and the results are shown in FIG. 8 .

As a result of comparing the FTIR graphs before and after adsorption of phosphate, ^{a specific absorption band of 1084 cm -1} was confirmed, which was found to be due to the bending vibration of the PO bond. In the case of nitrate, ^{a specific absorption band of 1363 cm -1} was identified, which was attributed to the bending vibration of the NO bond. In addition, in the case of hexavalent chromium, a new peak appeared after adsorption, indicating that specific bands of BN, OH, and NH were observed by electrostatic interaction, ion exchange, and surface complexation of h-BN@5%Pani with hexavalent chromium. It could be confirmed that the result was a shift.

Claims (8)

hexagonal boron nitride; and
Forming a covalent bond with the hexagonal boron nitride and surrounded by hexagonal boron nitride (encapsulation), polyaniline positioned inside the complex;
The content of the polyaniline is 1 to 5% by weight,
The size of the pores formed by the cross bonding of the hexagonal boron nitride and polyaniline is 1 to 100 nm,
A composite for removing inorganic contaminants, characterized in that the surface is positively charged.
The method of claim 1,
The inorganic contaminant is at least one selected from phosphate, nitrate, nitrite, silicate, arsenic and chromium.
a first step of adding polyaniline to an acidic solution to form a polyaniline solution;
a second step of reacting the polyaniline solution and hexagonal boron nitride to form a reactant; and
A method for producing a complex comprising a; a third step of neutralizing the reactant to form a neutralized reactant,
The content of the polyaniline is 1 to 5% by weight,
The method for manufacturing a composite for removing inorganic contaminants, characterized in that the size of the pores formed by the cross bonding of the hexagonal boron nitride and polyaniline is 1 to 100 nm, and the surface of the composite is positively charged.
4. The method of claim 3,
The third step is a method of manufacturing a complex for removing inorganic contaminants, characterized in that adding one or more neutralizing agents selected from ammonium persulfate, sodium chlorite, and hydrogen peroxide.
4. The method of claim 3,
The method for manufacturing a complex for removing inorganic contaminants, characterized in that it further comprises at least one process selected from filtering, washing, and drying the neutralized reactant.
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