KR101961223B1 - Arsenic adsorbent and manufacturing method thereof - Google Patents

Abstract

An embodiment of the present invention provides an arsenic adsorbent comprising loess, sand and hematite, wherein the weight ratio of loess and sand is 1: 5 to 1:15.
Another embodiment of the present invention relates to a method of mixing and calcining loess and sand (step 1); And mixing the iron precursor with the heat-treated material and performing a hydrothermal reaction (step 2).

Description

[0001] ARSENIC ADSORBENT AND MANUFACTURING METHOD THEREOF [0002]

The present invention relates to an arsenic adsorbent and a method for producing the same, and more particularly, to an arsenic adsorbent containing yellow ocher, sand and iron oxide and prepared through heat treatment and hydrothermal reaction.

Arsenic contamination is the result of raising the risk of human cancer. The occurrence of arsenic in drinking water was due to the natural lipids of India, Pakistan and Korea. The development of new arsenic adsorbents has recently been highlighted in order to meet the arsenic concentration requirement of 10 ppb or less.

Korean Patent No. 10-0840068 (Jun. 13, 2008), for example, discloses a filtration process comprising fractions or granules comprising iron oxides and / or iron oxyhydroxides having a particle size of 500 nm or less and a BET surface area of 50 to 500 m 2 / g Unit. ≪ / RTI > However, when such a fine powder is used, there is a problem that the strength is so weak that it is worn by the backwash wastewater and is crushed to cause turbidity or loss of the amount of the adsorbent. This will soon become wastewater, and the adsorbent with arsenic adsorbed in this wastewater can be another contaminant.

In another example, Korean Patent Laid-Open No. 10-2015-0060031 discloses a method of manufacturing a magnetic recording medium, comprising: (a) mixing iron oxide powder and a binder at a ratio of 8: 2; (b) kneading a mixture of the iron oxide powder and the binder with distilled water; And (c) molding, drying and baking the kneaded product. However, there is a problem that the iron ion of iron oxide can be eluted during removal of arsenic using the carrier prepared through the above-mentioned prior art.

As a condition for providing an arsenic adsorbent having excellent performance, first, iron ions of iron oxide nanoparticles immobilized on a matrix should not be eluted. Second, from a practical point of view, the particulate technology (ie, porosity) of the adsorbent is important. Third, the economical efficiency of the adsorbent should be satisfied and it should be possible to reuse.

Korean Patent No. 10-0840068

The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide an arsenic adsorbent which minimizes iron ion elution of iron oxide nanoparticles, satisfies economy and reusability, exhibits high adsorption performance, And the like.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein,

Wherein the weight ratio of the loess and the sand is from 1: 5 to 1:15.

In one embodiment, the hematite may be included in an amount of 63 to 177 parts by weight relative to the loess.

In one embodiment, the porosity of the arsenic adsorbent may be between 8.6% and 13.8%.

In one embodiment, the arsenic adsorbent may further comprise magnetite.

According to another aspect of the present invention,

Mixing the loess and sand and heat-treating (step 1); And mixing the iron precursor with the heat-treated material and performing a hydrothermal reaction (step 2).

In one embodiment, the mixing of the loess and sand of step 1 may be carried out at a weight ratio of 1: 5 to 1:15.

In one embodiment, the heat treatment of step 1 may be performed at atmospheric or at 2% by volume to 10% by volume of hydrogen and the remainder of the inert gas atmosphere.

In one embodiment, the heat treatment of step 1 may be performed at a temperature of 300 ° C to 700 ° C for 1 hour to 10 hours.

In one embodiment, the iron precursor of step 2 may include at least one selected from the group consisting of iron chloride, iron nitrate, iron sulfate, iron bromide, iron iodide, iron perchlorate, iron hydroxide and iron acetate.

In one embodiment, the iron precursor mixing in step 2 may be performed such that iron is mixed with 22 to 62 parts by weight of iron relative to the loess.

In one embodiment, the hydrothermal reaction of step 2 can be carried out at a temperature of 80 ° C to 150 ° C for 5 hours to 24 hours.

According to another aspect of the present invention,

The method of removing arsenic from contaminated water is carried out to bring contaminated water into contact with the arsenic adsorbent.

According to another aspect of the present invention,

An inlet through which the inflow of contaminated water is ensured; An outlet communicating with the inlet port to ensure discharge of the material; And an arsenic adsorbent disposed between the inlet and the outlet, for treating arsenic of contaminated water.

The arsenic adsorbent according to one aspect of the present invention can satisfy an arsenic concentration of 10 ppb or less without elution of iron ions when it is used for removing arsenic from the water.

In addition, the arsenic adsorbent according to one aspect of the present invention can mix the yellow soil and the sand at a specific ratio to secure the pores, thereby exhibiting the flow rate of the contaminated water.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a schematic view showing an example of a method for producing an arsenic adsorbent according to an embodiment of the present invention.
2 shows a scanning electron microscope and energy dispersive X-ray (EDX) analysis results of yellow soil.
3 shows the results of iron gradient mapping (X-ray fluorescence analysis) of yellow loess and scanning electron microscope photographs of hematite.
4 shows scanning electron microscope results of Comparative Example 1 and Comparative Example 2 of the present invention.
Fig. 5 is a graph showing the results of X-ray diffraction analysis of Comparative Example 4, Comparative Example 2 and yellow clay of the present invention.
6 is a photograph showing an example of the apparatus used for the arsenic removal experiment in Experimental Example 1 and Experimental Example 2 of the present invention.
7 is a graph showing arsenic concentrations according to the groundwater throughput of Comparative Example 1, Comparative Example 2 and Example 2 in Experimental Example 2 of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving it will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

It should be understood, however, that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. To fully inform the inventor of the category of invention. Further, the present invention is only defined by the scope of the claims.

Further, in the following description of the present invention, if it is determined that related arts or the like may obscure the gist of the present invention, detailed description thereof will be omitted.

One aspect of the present invention is

Loess, sand and hematite,

Wherein the weight ratio of the loess and the sand is 1: 5 to 1:15.

In the arsenic adsorbent according to one aspect of the invention, the loess has chlorite-serpentine (Chlorite-serpentine) [(Mg , Al) 6 (Si, Al) 4 O 10 (OH) 8], illite (illite _{) [(K, H 3 O} ) Al 2 Si 3 AlO 10 (OH) 2], kaolinite _{(kaolinite) [Al 2 Si 2} O 5 (OH) 4], montmorillonite (montmorillonite) [(Ca, Na ) _0.3 Al ₂ (may include _{Si, Al) 4 O 10 (} OH) 2 · nH 2 O], Plymouth nose byte _{(muscovite) [KAl 2 Si 3} AlO 10 (OH) 2] and the like.

Said loess comprising 17 wt% to 23 wt% silicon; 7 wt% to 13 wt% of aluminum; 1 wt% to 3 wt% of iron; And other impurities.

Said loess comprises 50 wt% to 55 wt% of silica; 17 wt% to 23 wt% iron oxide (Fe ₂ O ₃ ); 18 wt% to 24 wt% alumina, and other impurities.

The grain size of the loess may be between 105 [mu] m and 150 [mu] m. The porosity of the arsenic adsorbent can be easily controlled in the range of the loess particle size.

In the arsenic adsorbent according to one aspect of the present invention, the particle size of the sand may be 50 mesh to 70 mesh. The optimum porosity of the arsenic adsorbent can be expressed in the particle size range of the sand.

In the arsenic adsorbent according to one aspect of the present invention, the weight ratio of the loess and sand may be 1: 5 to 1:15, and preferably 1: 7 to 1:13. If the weight ratio of the loess and the sand is less than 1: 5, it is difficult to secure the pores of the adsorbent, There is a possibility that the adsorption performance of the adsorbent is lowered. Therefore, the removal rate of the contaminated water of the adsorbent and the adsorption performance of arsenic can be suitably satisfied within the above-mentioned range of the weight of the loess and sand.

In the arsenic adsorbent according to one aspect of the present invention, the hematite (? -Fe ₂ O ₃ ) may be contained in an amount of 63 to 177 parts by weight, preferably 93 to 147 parts by weight, have. If the amount of hematite relative to the loess is less than 63 parts by weight, the arsenic adsorbent may not exhibit the desired arsenic adsorption performance. If the hematite is contained in an amount of 177 parts by weight or more relative to the loess, The arsenic removal efficiency may be lowered.

The hematite can be formed through an iron precursor and a hydrothermal reaction in an arsenic adsorbent production method described later, and thus the iron ion component can be prevented from leaching when used in the arsenic removal process of polluted water.

The hematite may be formed by coating on the loess and sand mixture by an arsenic adsorbent production method described below.

In the arsenic adsorbent according to one aspect of the present invention, the porosity of the arsenic adsorbent may be 8.6% to 13.8%, preferably 9.3% to 13.1%. It is possible to satisfy the arsenic adsorption performance and the appropriate flow rate of the permeated polluted water within the above porosity range.

In the arsenic adsorbent according to one aspect of the present invention, it may further include magnetite (Fe ₃ O ₄ ). The magnetite may be formed through a heat treatment process in an arsenic adsorbent production method described below.

The arsenic adsorbent according to one aspect of the present invention can treat contaminated water having an arsenic concentration of 50 ppb to 200 ppb to less than 10 ppb. In addition, the elution of the iron ion component in the adsorbent during treatment can be minimized. The arsenic adsorption process in the contaminated water of the arsenic adsorbent can be carried out by passing the polluted water through the arsenic adsorbent and the flow rate when the polluted water passes through the adsorbent may be from 0.2 mL / min to 2.0 mL / min, 0.4 mL / min to 1.5 mL / min.

The arsenic adsorbent according to one aspect of the present invention can be reused by washing through a basic solution of 0.2 M to 2.0 M after arsenic treatment of contaminated water, and the basic solution may be an alkali metal hydroxide, an alkaline earth metal hydroxide, May be sodium hydroxide. Upon reuse through the washing, the arsenic adsorption performance can be maintained at 80% to 98% of the initial performance.

According to another aspect of the present invention,

Mixing yellow soil and sand, and heat-treating (step 1) (S10); And

Mixing the iron precursor with the heat-treated material and performing a hydrothermal reaction (Step 2) (S20).

Hereinafter, the method for producing an arsenic adsorbent according to one aspect of the present invention will be described in detail for each step.

In the method for producing an arsenic adsorbent according to an aspect of the present invention, the step 1 (S10) mixes yellow soil and sand and performs heat treatment.

The mixing of the loess and sand of step 1 above can be carried out at a weight ratio of 1: 5 to 1:15, preferably at a weight ratio of 1: 7 to 1:13. If the mixing weight ratio of the loess and sand is less than 1: 5, it is difficult to secure the pores of the adsorbent to be produced, and there is a possibility that a proper flow rate may not be exhibited when treating the intended polluted water. When the weight ratio of the loess and sand exceeds 1:15 , The adsorption performance of arsenic of the adsorbent to be produced may be deteriorated. Therefore, by mixing yellow soil and sand within the above-mentioned weight ratio range, the pollutant flow rate and the adsorption performance of arsenic can be suitably satisfied.

The heat treatment in step 1 may be carried out in an atmospheric air or in an atmosphere of between 2 vol% and 10 vol% hydrogen and the remainder of the inert gas atmosphere, preferably in a range of 2 vol% to 6 vol% hydrogen and the remaining inert gas atmosphere . The inert gas may be at least one selected from the group consisting of argon, nitrogen, helium, and neon, and preferably argon. When the heat treatment is carried out in an atmosphere satisfying the above hydrogen range, the hematite of the finally produced adsorbent can be more clearly formed.

The heat treatment in step 1 may be performed at a temperature of 300 ° C to 700 ° C for 1 hour to 10 hours, preferably at a temperature of 400 ° C to 600 ° C for 1 hour to 5 hours. By performing the heat treatment in the temperature and the time range described above, the target porosity can be exhibited, uniform pore formation and subsequent formation of hematite can be easily performed, and the adsorbent exhibits a high arsenic adsorption performance .

In the method of manufacturing an arsenic adsorbent according to an aspect of the present invention, the step 2 (S20) mixes the iron precursor with the heat-treated material and performs a hydrothermal reaction.

Iron precursor in step 2 can comprise one or more selected from the group consisting of iron chloride, iron nitrate, iron sulfate, bromide, iron iodide, iron perchlorate, iron, iron hydroxide, and iron acetate, preferably ferric chloride (FeCl ₃₎ . ≪ / RTI >

The mixing of the iron precursor in step 2 may be performed so that 22 to 62 parts by weight of iron is mixed with the loess, and preferably 32 to 52 parts by weight of iron is mixed with the loess. If the iron precursor is mixed so as to contain less than 22 parts by weight of iron relative to the loess, then formation of hematite may be unacceptable in the subsequent hydrothermal reaction step and the iron precursor may contain more than 62 parts by weight of iron relative to the loess If mixed, there is a risk that the adsorbent produced will not significantly affect the arsenic adsorption performance. By mixing in the iron precursor weight ratio range described above, hematite can easily be formed through a hydrothermal reaction at a subsequent stage, and the wastes of resources and the increase of the process cost can be minimized.

The iron precursor mixing in step 2 may be performed by providing a mixed solution obtained by mixing the yellow clay and sand mixture treated with the step 1 with distilled water, and adding an iron precursor to the mixed solution. The concentration of the mixed solution before the introduction of the iron precursor may be adjusted to be 0.08 g / mL to 0.48 g / mL. Uniform mixing of the loess, sand and iron precursor within the above-mentioned concentration range can be facilitated.

After the iron precursor of step 2 is mixed, ultrasonic treatment may be performed for 5 to 20 minutes to evenly disperse the iron precursor.

The hydrothermal reaction of step 2 may be carried out by treating the iron precursor mixed mixture at a temperature of 80 to 150 캜 for 5 to 24 hours, preferably at a temperature of 80 to 120 캜 for 5 to 12 For a period of time. If the hydrothermal reaction temperature in step 2 is less than 80 ° C and the hydrothermal reaction time is less than 5 hours, there is a fear that formation of hematite is unacceptable. If the hydrothermal reaction temperature in step 2 is more than 150 ° C, There is a possibility that an excessive energy waste is generated in the formation of hematite. The hematite can be easily formed in the mixture of the loess and sand in the above temperature and time range, but unnecessary energy consumption can be minimized and the increase in the process cost can be reduced.

The hydrothermal reaction of step 2 may be performed by charging the iron precursor mixed mixture into the vessel and sealing it.

After completion of the hydrothermal reaction in step 2, the supernatant is separated and the remaining precipitate is dried at a temperature of 40 to 80 ° C. for 10 to 50 hours to prepare an arsenic adsorbent.

Through the hydrothermal reaction in the step 2, hematite can be formed in the mixture of the yellow loess and the sand in the step 1, and specifically, it can be coated with hematite.

Another aspect of the present invention is

The method of removing arsenic from contaminated water is carried out to bring contaminated water into contact with the arsenic adsorbent.

The method of removing arsenic from the contaminated water can be performed to induce a flow of contaminated water in contact with the arsenic adsorbent and contaminated water having an arsenic concentration of 50 ppb to 200 ppb. The flow rate during the fluid flow induction may be 0.2 mL / min to 2.0 mL / min, and preferably 0.4 mL / min to 1.5 mL / min.

The material in which the method of removing the contaminated water is performed may exhibit an arsenic concentration of less than 10 ppb.

Another aspect of the present invention is

An inlet through which the inflow of contaminated water is ensured;

An outlet communicating with the inlet port to ensure discharge of the material; And

And an arsenic adsorbent disposed between the inlet and the outlet.

The arsenic adsorbent may be filled and sealed between the inlet and the outlet.

Hereinafter, the present invention will be described in more detail with reference to Examples and Experimental Examples. However, the following examples and experimental examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

< Example  1> Loess: Sand  1: 5 / hydrogen condition heat treatment / hydrothermal reaction

Natural loess was collected from Gyeongnam Province and dried at 60 ℃ for 24 hours. Dried, pulverized and sieved to a particle size of 106 mu m to 149 mu m.

The sand was prepared to have a particle size of 50 mesh to 70 mesh.

Step 1: 1 g and 5 g of the loess and sand were mixed in a weight ratio of 1: 5, respectively, and heat-treated at 500 ° C for 3 hours in a mixed gas atmosphere of 4% by volume of hydrogen and 96% by volume of argon.

Step 2: 6 g of the heat-treated loess and sand mixture was mixed with a magnetic stir bar with a 60-mL glass beaker and 60 mL of distilled water. Then, 2.0 g of iron chloride hexahydrate (FeCl ₃ .6H ₂ O) was added, sonicated for 10 minutes, put into a polypropylene container and sealed. Then, hydrothermal reaction was carried out at a temperature of 100 ° C. for 12 hours. After removing the supernatant, the precipitate was dried at a temperature of 60 ° C. for 24 hours to prepare an arsenic adsorbent.

< Example  2> Loess: Sand  1:10 / hydrogen condition heat treatment / hydrothermal reaction

In Example 1, an arsenic adsorbent was prepared in the same manner as in Example 1 except that the weight ratio of the loess and sand was 1:10.

< Example  3> Loess: Sand  1:15 / hydrogen condition heat treatment / hydrothermal reaction

In Example 1, an arsenic adsorbent was prepared in the same manner as in Example 1 except that the weight ratio of the loess and sand was 1:15.

< Comparative Example  1> Loess: Sand  1:10 / Atmospheric condition heat treatment / hydrothermal reaction X

In Example 2, an adsorbent was prepared in the same manner as in Example 2, except that the heat treatment in Step 1 was performed in air and the iron precursor mixture in Step 2 and the hydrothermal reaction were omitted.

< Comparative Example  2> Loess: Sand  1:10 / hydrogen condition heat treatment / hydrothermal reaction X

In Example 2, an adsorbent was prepared in the same manner as in Example 2, except that the iron precursor mixture in Step 2 and the hydrothermal reaction were omitted.

< Comparative Example  3> Loess: Sand  1: 5 / Hydrogen condition Heat treatment / hydrothermal reaction X

In Example 1, an adsorbent was prepared in the same manner as in Example 1, except that the iron precursor mixture in Step 2 and the hydrothermal reaction were omitted.

< Comparative Example  4> hydrothermal reaction

The iron hydroxide (Fe (OH) ₃ ) was treated in the same manner as the hydrothermal reaction conditions of Example 1 to form hematite.

The above examples and comparative examples are schematically shown in Table 1.

Step 1 Step 2 Example 1 Loess: Sand 1: 5 / Hydrogen Condition Heat Treatment FeCl ₃ / hydrothermal reaction Example 2 Loess: Sand 1:10 / Hydrogen Condition Heat treatment Same as Example 1 Example 3 Loess: Sand 1:15 / Hydrogen Condition Heat treatment Same as Example 1 Comparative Example 1 Loess: Sand 1:10 / Atmospheric condition heat treatment X Comparative Example 2 Loess: Sand 1:10 / Hydrogen Condition Heat treatment X Comparative Example 3 Loess: Sand 1: 5 / Hydrogen Condition Heat Treatment X Comparative Example 4 X Fe (OH) ₃ / hydrothermal reaction

< Experimental Example  1> Flow rate measurement through one-dimensional column

(Column, Kontes, USA) having a diameter of 30 mm and a height of 240 mm. The adsorbent prepared in Example 2, Comparative Example 1 and Comparative Example 3 was filled in the column, and then 500 mL of distilled water The column flow rate was measured by injection at the top of the column.

As a result, in Comparative Example 1 in which the ratio of loess to sand was 1:10, the flow rate was approximately 1.2 mL / min. In Comparative Example 3 in which the ratio of loess to sand was 1: 5, Respectively. In Example 2, which completed the hydrothermal reaction, the flow rate was 0.4 mL / min. At this time, the pore volume of the three adsorbents was measured between 18 mL and 20 mL through distilled water.

< Experimental Example  2> Through one-dimensional column Arsenic removal  Measure

(Column, Kontes, USA) having a diameter of 30 mm and a height of 240 mm. The adsorbent prepared in Example 2, Comparative Example 1 and Comparative Example 2 was filled in the column, and 100 ppb 1.0 L of groundwater in a small village with arsenic concentration was injected from the top of the column. The groundwater discharged after the injection was collected in a glass bottle in a volume of about 20 mL and analyzed by ICP-AES (OPTIMA 7300 DV, OPTIMA 3300 DV, Perkin-Elmer, USA) Respectively.

Referring to FIG. 7, the two adsorbents of Comparative Example 1 and Comparative Example 2 showed a similar pattern. On the other hand, in Example 2, the iron ion elution was 0.1 ppm or less, and the arsenic removal rate was significantly increased as compared with the comparative example. Although the flow rate was approximately 0.4 mL / min, it was confirmed that the arsenic removal capacity of Example 2 was twice as high as that of Comparative Example 1.

To reuse the Example 2, an additional three additional runs were performed with a 0.5M sodium hydroxide (NaOH) wash, with a slight decrease in arsenic removal capacity.

In other words, α-Fe ₂ O ₃ (hematite) is formed through the hydrothermal reaction and the mixed mixture of loess: sand 1:10 by weight becomes an arsenic alternative adsorbent that can satisfy the water standard value in the actual arsenic contaminated groundwater treatment Respectively.

< Experimental Example  3> The adsorbent Morphology , X-ray diffraction, fluorescence analysis

The morphology was measured by scanning electron microscope (FE-SEM-4700) and energy dispersive X-ray (EDX) analysis of yellow soil, Comparative Example 1, Comparative Example 2 and Comparative Example 4,

X-ray diffraction analysis (D / MAX-2500, RIGAKU, USA, 40 kV, 300 mA with scanning at 2? = 3 ° to 70 °) of yellow soil, Comparative Example 2 and Comparative Example 4, and XRF , MiniPal2, PANanalytical, Netherlands). The results are shown in FIGS. 2 to 5. FIG.

2 to 4, pore structure was observed in Comparative Example 1 (FIG. 4 (a)) and Comparative Example 2 (FIG. 4 (b)) which were heat-treated as compared with yellow loess (FIG. 2 (a) It was judged that this was caused by the mixing of appropriate proportion of sand.

In FIG. 3 (b), the morphology of Comparative Example 4 confirmed that the spherical hematites were agglomerated in a size range of 10 nm to 1000 nm, and the porosity was decreased due to the hydrothermal reaction.

As shown in Fig. 2 (b), the composition of loess was mainly composed of silicon (20.76 wt%), aluminum (8.56 wt%) and iron (2.19 wt%), I could. Referring to FIG. 2 (a), X-ray fluorescence analysis of the yellow loam revealed that 53.5 wt% of silica and 21.0 wt% of alumina contained 19.4 wt% of iron oxide.

Referring to FIG. 5, Comparative Example 4, Comparative Example 2, and X-ray diffraction pattern of loess. The major minerals of loess are chlorite serpentine [(Mg, Al) ₆ (Si, Al) ₄ ] O ₁₀ (OH) ₈ ], illite [(K, H ₃ O) _{2 Si 3 AlO 10 (OH)} 2], kaolinite _{(kaolinite) [Al 2 Si 2} O 5 (OH) 4], montmorillonite (montmorillonite) [(Ca, Na ) 0.3 Al 2 (Si, Al) 4 O was observed in the ₁₀ (OH) ₂ and nH ₂ O], Plymouth nose byte _{(Muscovite) [KAl 2 Si 3} AlO 10 (OH) 2], a small amount of α-Fe ₂ O ₃ (hematite). These components were consistent with the results of an X-ray fluorescence spectrometer. Comparative Example 2, which was heat-treated under hydrogen conditions, showed slightly different reflection peaks. the crystallinity of α-Fe ₂ O ₃ (hematite) was markedly increased, and a weak peak of Fe ₃ O ₄ (magnetite) appeared.

In Fig. 5, the red star mark shows different peaks between the yellow loess and the yellow loess heat treated in the hydrogen condition.

Comparative Example 4 treated the coated Fe (OH) ₃ with a hydrothermal reaction to increase the iron content of the adsorbent. The reason for using the hydrothermal reaction is to avoid elution of iron ion compared with heat treatment in atmosphere or hydrogen.

Although the specific examples of the arsenic adsorbent according to one aspect of the present invention and the production method thereof have been described so far, it is apparent that various modifications can be made without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be construed as being limited to the embodiments described, but should be determined by equivalents to the appended claims, as well as the following claims.

It is to be understood that the foregoing embodiments are illustrative and not restrictive in all respects and that the scope of the present invention is indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

Claims (13)

Loess, sand and hematite,
The weight ratio of the loess and sand is 1: 5 to 1:15,
Characterized in that it is prepared by heat treatment of yellow soil and sand in a mixed gas atmosphere containing hydrogen, followed by addition of an iron precursor, and hydrothermal reaction.
The method according to claim 1,
The hematite,
And 63 to 177 parts by weight based on the weight of the loess.
The method according to claim 1,
The porosity of the arsenic adsorbent,
8.6% to 13.8%.
The method according to claim 1,
The above-
Wherein the adsorbent further comprises a magnetite.
(1) mixing the clay and the sand in a weight ratio of 1: 5 to 1:15 and heat-treating the mixture in a mixed gas atmosphere containing hydrogen; And
Mixing the iron precursor with the heat-treated material, and performing a hydrothermal reaction (Step 2).
delete 6. The method of claim 5,
The heat treatment in the step (1)
Characterized in that it is carried out in an atmosphere of between 2 vol% and 10 vol% of hydrogen and the remainder of the inert gas.
8. The method of claim 7,
The heat treatment in the step (1)
Wherein the reaction is carried out at a temperature of from 300 DEG C to 700 DEG C for 1 hour to 10 hours.
6. The method of claim 5,
The iron precursor of step (2)
Characterized in that it comprises at least one selected from the group consisting of iron chloride, iron nitrate, iron sulfate, iron bromide, iron iodide, iron perchlorate, iron hydroxide and iron acetate.
6. The method of claim 5,
The iron precursor mixture of step 2,
And 22 to 62 parts by weight of iron relative to the loess is mixed.
6. The method of claim 5,
In the hydrothermal reaction of step 2,
At a temperature of 80 DEG C to 150 DEG C for 5 hours to 24 hours.
A method for removing arsenic from contaminated water, the method comprising contacting the contaminated water with an arsenic adsorbent of claim 1.
An inlet through which the inflow of contaminated water is ensured;
An outlet communicating with the inlet port to ensure discharge of the material; And
The apparatus for treating arsenic of contaminated water according to claim 1, wherein the arsenic adsorbent is disposed between the inlet and the outlet.

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