JP2782593B2 - Bismuth lead compound - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel bismuth lead compound containing a (NO ₃ ) group, a method for producing the same, and a method for removing an inorganic anion exchanger and an inorganic anion using the same. More specifically, the present invention relates to the removal of inorganic anions such as chloride ions and iodide ions from aqueous solutions and organic solvents, the treatment of industrial effluents, the removal and immobilization of radioactive ions from nuclear power effluents, and the removal of ions in gases. The present invention relates to a novel bismuth lead compound useful for recovery and removal of a volatile component, a method for producing the same, an inorganic anion exchanger as a method of using the compound, and a method for solidifying and removing an inorganic anion.

[0002]

2. Description of the Related Art Conventionally, the removal of inorganic anions such as chloride ions has been an important issue in various industrial fields, for example, chemical industry, food industry, industrial waste liquid treatment, and nuclear power generation waste liquid treatment. Therefore, an ion exchanger has been developed as a processing material therefor. In particular, it is necessary to store radioactive chloride ions and radioactive iodide ions as stable solids.

[0003] Conventionally, organic ion exchangers have been mainly used as the ion exchanger. However, organic ion exchangers have low exchange performance with inorganic anions.
In addition, there is a problem in its stability when used as a material for removing inorganic anions or a material for solidifying and removing radioactive inorganic anions.
Therefore, an inorganic ion exchanger has been attracting attention as a material for removing and solidifying inorganic anions.

[0004] However, the inorganic anion exchangers hitherto known are poor in acid resistance, alkali resistance and heat resistance, and therefore, the use of this inorganic anion exchanger is not stable. However, there are drawbacks such as the presence of many complicated pre-processings and lack of versatility. In addition, conventional inorganic anion exchanger,
In general, it has been pointed out that the ion exchange capacity and the ion exchange rate are small, and it has not been practically possible to perform efficient ion exchange.

[0005] The present invention has been made in view of the above circumstances, solves the drawbacks of the conventional inorganic ion exchanger, is excellent in acid resistance, alkali resistance and heat resistance, and has an ion exchange capacity and It is an object of the present invention to provide a new substance system useful as an inorganic anion exchanger having a high ion exchange rate, a method for producing the same, and a method for using the same as an ion exchanger or an ion solidified substance.

[0006]

According to the present invention, there is provided a bismuth lead compound represented by BiPbO ₂ (NO ₃ ), a method for producing the same, and a method for using the same. That is, in the present invention, while providing the above compound, a mixture adjusted so that the molar ratio of bismuth element, lead element, oxygen element, and nitrate group (NO ₃ ) becomes approximately 1: 1: 2: 1 is provided. The present invention provides a method for producing a bismuth lead compound, which comprises heating and reacting a raw material with or without adding water to the raw material.

Further, the present invention also provides an inorganic ion exchanger containing the above-mentioned bismuth lead compound as an active ingredient, and a method for removing and immobilizing chloride ions and iodide ions using the same.

[0008]

DETAILED DESCRIPTION OF THE INVENTION
In the method of the present invention for producing the target bismuth lead compound, for example, an appropriate compound such as bismuth oxide, lead oxide, bismuth nitrate, or lead nitrate is used as a raw material. Among these compounds, a mixture obtained by combining necessary compounds is used as a raw material. The average composition of the raw material is such that the ratio of bismuth element to lead element is about 1:
1, and the ratios of bismuth element to oxygen element and bismuth element to nitrate group are approximately 1: 2 and 1:
It is preferable to adjust the composition of the starting material so as to be 1. The ratio of the oxygen element and the nitric acid group to the bismuth element may be usually higher than this ratio. This is because excess oxygen and nitrate groups are eventually released and do not affect the product composition.

A chemical reaction formula for producing BiPbO ₂ (NO ₃ ) from a starting material can be exemplified, for example, as follows.

[0010]

Embedded image Since the reactions (1) and (2) do not proceed at a temperature near room temperature, the reaction (1) is usually heated to 200 ° C. or more, and the reaction (2) is usually heated to 300 ° C. or more. Is preferred. Further, when water is added to the powder raw material during the reaction, the reaction starting temperature can be lowered. For example, in the reaction (2), when the reaction is performed in a state where water is added to the raw material, 250
Pure BiPbO ₂ (NO ₃ ) is obtained even at ℃.

When these reactions are performed in an open container, a part of NO ₃ is released into the atmosphere without reacting,
It is desirable to use a closed container since the added water is released into the atmosphere, and the yield of the target compound is reduced. However, when synthesizing by the above-mentioned chemical reaction in a closed container, coexisting water and unreacted nitrate groups are present as gas components, and the pressure in the closed container is made higher than the atmospheric pressure. Therefore, it is desirable to use a pressure-resistant container as the closed container or to use the closed container in a pressure container.

The BiPbO ₂ (N
The compound represented by the formula of O ₃ ) is useful as an inorganic anion exchanger, thereby effectively removing inorganic anions such as halide ions such as chloride ions and iodide ions, and It can be changed to a stable solid. Ion exchangeability is effective in any of acidic, neutral and alkaline aqueous solutions.

It is known that some bismuth oxide nitrate compounds have ion-exchange properties with respect to halogen ions, but such compounds have a hydroxyl group or a nitrate group contained in the composition. It has been shown to ion exchange with halogen ions. The bismuth lead compound of the present invention also has a nitrate group in its composition, and it has been confirmed that this compound exchanges ions with chloride ions, iodide ions and the like. And, in the case of the present invention, excellent ion exchange properties which cannot be predicted from conventional knowledge are realized.

The ion exchanger comprising the compound of the present invention is expected to be effective not only as a halide ion but also as an exchanger for various inorganic anions and as a solidifying / removing agent. Various uses are also possible in the form of use as an ion exchanger, and the form of use such as a granular material, a powdery material, or a porous binder using these binders is appropriately considered.

[0015]

The present invention will be described in more detail with reference to the following examples, which illustrate embodiments of the bismuth lead compound of the present invention, a method for producing the same, and an inorganic anion exchanger using the same. Example 1 PbO and Bi ₂ O ₃ and _{Bi (NO 3) 3 · 5H} 2 O 3: 1: The mixed powder sample was used as the starting material in a molar ratio. About 0.2 g of this raw material was put in a platinum capsule and sealed. And after putting this capsule in a pressure vessel,
Heating was performed for 24 hours in an electric furnace which had been preheated to a constant temperature. During heating, the inside of the pressure vessel is
The pressure was increased to kg / cm ² in order to prevent the internal pressure of the platinum capsule from rising due to the gas component released by decomposition and breaking the capsule. After the heating, the sample was rapidly cooled and the sample was taken out, and the composition was analyzed and the structure was analyzed.

The composition of the product was analyzed by a method using both thermogravimetric analysis and mass spectrometry. BiPbO ₂ (NO ₃ )
Decomposes when heated to high temperatures. The state of decomposition was examined using a thermobalance, and the results are shown in FIG. This figure 1
As can be seen from, the decomposition started around 450 ° C,
Completed at around 600 ° C. At this time, the weight of the sample is 1
It decreased by 0.58%. The gas components released during this decomposition were examined by simultaneous observation with a mass spectrometer. The result is shown in FIG. The main components released by the decomposition are NO, O ₂ , O, N and the like, which are the decomposition components of NO ₃ . In addition, a small amount of CO ₂
Are released, but the amount is very small and negligible as is evident from FIG. Therefore, BiPbO ₂
The reaction when (NO ₃ ) is thermally decomposed can be described as follows.

[0017]

Embedded image In this reaction formula, (s) represents a solid, and (g) represents a gas.
NO is further decomposed and reacted to generate O ₂ , N, and the like.
Thus, if the pyrolysis is performed according to equation (3), then the weight of the decreasing sample is calculated to be 10.59%. This value and the value obtained from the experiment shown in FIG.
Compared to 8%, it shows a very good agreement. This indicates that the composition of the product was BiPbO ₂ (NO ₃ ), which was decomposed according to equation (3).

From the results of the above thermogravimetric analysis and mass analysis,
The composition of the product of the present invention was confirmed to be BiPbO ₂ (NO ₃ ). Then, the compound BiPbO ₂ (N
The structural analysis of O ₃ ) was performed by analyzing the x-ray diffraction pattern of the powder sample. Compound Bi ₂ O ₂ (CO ₃ ) and B
iPbO ₂ I and compound B synthesized by the method of the present invention
The X-ray diffraction patterns of the respective powder samples of iPbO ₂ (NO ₃ ) are shown in FIGS. When these patterns are compared, it can be seen that A, B, and C are similar patterns. The pattern of the compound BiPbO ₂ (NO ₃₎ patterns of (A) and the compound _{Bi 2 O 2 (CO 3)} (C) are particularly well similar. This indicates that the structures of the two compounds are basically the same.

The structure of the compound Bi ₂ O ₂ (CO ₃ ) has been elucidated. According to this, this compound has a tetragonal structure, and the lattice constants are a = 3.867 and c = 1.
It is reported to be 3.686. In the present invention, structural analysis was performed on the compound BiPbO ₂ (NO ₃ ), assuming that it has a tetragonal structure. as a result,
The lattice constant of BiPbO ₂ (NO ₃ ) is a = 3.971
It was analyzed that 0, c = 14.8189. For all peaks, the surface index (h kl), the calculated value (d ₁ ) and the measured value (d ₂ ) of the surface spacing (d （), and the measured value of the relative reflection intensity (I%) of the X-ray peak (I%) I ₂ ) was determined. Table 1 shows the results. All peaks can be indexed and the calculated and measured values show very good agreement, indicating that the results of this structural analysis are correct. From these results and the results of the composition analysis described above, the synthesized compound was BiPbO
It is concluded that this is a single phase with a composition of ₂ (NO ₃ ).

[0020]

[Table 1] Example 2 Table 2 shows production examples in which the reaction temperature in Example 1 was changed to 100 to 450 ° C. Pure BiPbO ₂ (NO
_{In order} to synthesize ₃ ) by heating for 24 hours, it is understood that it is desirable to react at a temperature of about 200 ° C. or higher.

[0021]

[Table 2] The heating time required to generate pure BiPbO ₂ (NO ₃ ) may be shorter than 24 hours. For example, 3
When the starting material was taken out by heating at 50 ° C. for 2 hours,
Pure BiPbO ₂ (NO ₃ ) was formed. Example 3 It was confirmed that even if the raw material described in Example 1 was heated at a temperature of 200 ° C. or less, almost pure BiPbO ₂ (NO ₃ ) could be produced if the heating time was longer than 24 hours. . That is, Table 3 shows examples in which the same apparatus, method and raw materials as those described in Example 1 were used and heated at 150 ° C. for various times. As is clear from Table 3, even at this temperature, almost pure B
iPbO ₂ (NO ₃ ) is obtained.

[0022]

[Table 3] Example 4 A powder sample in which PbO, Bi ₂ O ₃ and Pb (NO ₃ ) ₂ were mixed at a molar ratio of 1: 1: 1 was used as a starting material. About 0.2 g of this raw material was put in a platinum capsule and sealed. Then, a heating reaction was performed for 24 hours using the same apparatus and method as described in Example 1. After heating, the sample was quenched and taken out, and identified by a powder X-ray diffraction pattern.

Table 4 shows an example in which the reaction was carried out at a reaction temperature of 100 to 450 ° C. Pure BiPbO ₂ (NO
_{In order} to synthesize ₃ ) by heating for 24 hours, it is understood that it is desirable to react at a temperature of about 300 ° C. or higher.

[0024]

[Table 4] Also in this case, the heating time required to generate pure BiPbO ₂ (NO ₃ ) may be shorter than 24 hours. For example, when the starting material was taken out by heating at 350 ° C. for 2 hours, pure BiPbO ₂ (NO ₃ ) was produced. Example 5 0.2 ml of pure water was further added to the starting material having the same composition and amount as used in Example 4, and the mixture was sealed in a platinum capsule. Then, a heating reaction was performed at a temperature of 200, 250, and 300 ° C. for 24 hours using the same apparatus and method as described in Example 1. After heating, the sample was quenched and taken out, and identified by a powder X-ray diffraction pattern. Table 5 shows the results. As is clear from Table 5, pure BiPbO
_To synthesize ₂ (NO ₃ ) by heating for 24 hours, 2
It is desirable to carry out the reaction at a temperature near or above 50 ° C., which is 50 ° C. lower than in Example 3, which is the result of adding water to the starting material.

[0025]

[Table 5] Example 6 Compound BiPbO ₂ (NO ₃ ), about 0.1 g (about 2 × 1
0 ^-4 g molecule) and 0.1 mol dm ^-3 and 0.05
1 ml (Cl ^-1 : about 1 × 10 ^-4 gram ion and about 0.5 × 10 ^-4 gram ion) of mol dm ^-3 NaCl solution (adjusted to pH = 1 using HNO ³ solution) And the reaction was carried out in a thermostat at a temperature of 25 ° C. with changing the time, and the progress of the reaction was examined. During the reaction, the solution was agitated by shaking the vessel. After a certain period of time, the container was taken out, the liquid and the solid were separated, and the concentration of chloride ions remaining in the solution was measured by ion chromatography.

FIG. 4 of the accompanying drawings shows the relationship between the reaction time and the percentage (%) of residual chloride ions. At any concentration, the reaction proceeded very quickly, and the concentration of the chloride ion remaining within 80 minutes after the start of the reaction reached a substantially constant value. Its value is 0.1 mol dm ^-3 Na
In a reaction in a Cl solution, about 21%, 0.05 mold
The reaction in m ⁻³ NaCl solution was about 0.3%. The above results indicate that the compound BiPbO ₂ (NO ₃ ) stably and effectively acts as an inorganic anion exchanger even in a strongly acidic (pH = 1) solution. Example 7 Compound BiPbO ₂ (NO ₃ ), about 0.1 g (about 2 × 1
0 ^-4 g molecule) and 0.1 mol dm ^-3 and 0.05
mol dm ^-3 NaCl solution 0.1 mol dm ^-1 (N
pH was adjusted to 13 using an aOH solution), 1 ml (C
l: about 1 × 10 ^-4 gram ion and about 0.5 × 10 ^-4 gram ion) in a container with a lid and 25
The reaction was carried out at a temperature of ° C. for various times, and the progress of the reaction was examined. During the reaction, the solution was agitated by shaking the vessel. After a certain period of time, the container was taken out, the liquid and the solid were separated, and the concentration of chloride ions remaining in the solution was measured by ion chromatography.

FIG. 5 of the accompanying drawings shows the relationship between the reaction time and the ratio (%) of the remaining chloride ions. The reaction proceeds relatively quickly, with 0.1 mol dm ^-3 N
The reaction in the aCl solution was almost completed in about 3 hours after the start of the reaction. At this time, the ratio of the remaining chloride ions was about 2%. Also, 0.05 mol dm ^-3 Na
In the reaction in the Cl solution, the reaction proceeded very quickly, and was almost completed in about 30 minutes after the reaction started. At this time, the ratio of the remaining chloride ions was about 1%.

The above results indicate that the compound BiPbO ₂ (NO
₃ ) shows that it acts stably and effectively as an inorganic anion exchanger even in a strongly alkaline (pH = 13) solution. Example 8 Compound BiPbO ₂ (NO ₃ ), about 2.0 g (about 4 × 1
0 ^-3 gram molecule) and 0.05 mol dm ^-3 NaCl
10 ml of solution (adjusted to pH = 1 and pH = 13) (Cl
^-1 : about 5 × 10 ^-4 gram ion) and the compound BiPbO
₂ (NO ₃ ), about 2.0 g (about 4 × 10 ^-3 gram molecule)
And 0.005 mol dm ^-3 NaCl solution (pH = 1
And adjusted to pH = 13), 10 ml (Cl: 5 × 10 ⁻⁵ gram ion) was placed in a container with a lid, sealed, and reacted in a thermostat at 25 ° C. for 24 hours while stirring the container. In this embodiment, the ratio of the ion exchanger to chloride ions is increased as compared with the first and second embodiments. Also, the concentration of chloride ions was changed.

The results are shown in Table 6. As is clear from Table 6, chloride ions were efficiently removed in both the solutions of pH = 1 and pH = 13.

[0030]

[Table 6] Example 9 Compound BiPb in NaCl solution showing different pH values
The ion exchange capacity of O ₂ (NO ₃ ) was measured. Note that the ion exchange capacity is represented by the number of equivalents (or milligram equivalents) of ions adsorbed or ion-exchanged per gram of the ion exchanger, and the unit is meqeg ^-1 (equivalent number per gram) or meqeg ^-1 ( Milligram equivalents per gram).

Compound BiPbO ₂ (NO ₃ ), about 97 m
g and 1 ml of a 0.2 mol dm ^-3 NaCl solution were put in a container with a lid and sealed, and were then placed in a thermostat at 25 ° C and 50 ° C.
And at 75 ° C. for 24 hours. During the reaction, the solution was agitated by shaking the vessel. After the reaction,
The container was taken out, the liquid and the solid were separated, and the ion exchange capacity was determined by measuring the concentration of chloride ions remaining in the solution by ion chromatography. Solution pH
Was changed from 1 to 13. The pH was adjusted using a nitric acid solution on the acidic side and a sodium hydroxide solution on the alkaline side.

FIG. 6 of the accompanying drawings shows the relationship between the ion exchange capacity of chloride ions measured at 25 ° C., 50 ° C. and 75 ° C. and the pH of the aqueous solution. The maximum theoretical value of the ion exchange capacity shown in the figure (1.96 meqe
The _{^{g -1), BiPbO 2 (NO}} 3) of the (NO ₃₎ ^- are all Cl ^- is the value of the ion exchange capacity was calculated as was replaced.

As is clear from FIG. 6, the ion exchanger of the present invention shows a high ion exchange capacity in a strongly acidic and strongly alkaline solution at 25 ° C., 50 ° C. and 75 ° C. At a higher temperature, 75 ° C., a high or finite ion exchange capacity is exhibited in any of acidic, neutral, and alkaline regions. For reactions in solutions at pH = 12,13, the value of ion exchange capacity measured at 50 ° C. and 75 ° C. is approximately equal to the maximum theoretical value, and almost all (N
O ₃₎ ^- is Cl ^- indicates that it is substituted with, show that very high efficiency of the ion exchange. Example 10 BiPbO ₂ (NO ₃ ), about 0.1 g (about 2 × 10 ⁻⁴ gram molecule) and 0.1 mol dm ⁻³ NaI solution (HN
PH was adjusted to 1 using an O ₃ solution), 1 ml (I ⁻ : about 1 × 10 ⁻⁴ gram ion) was placed in a container with a lid, and the mixture was kept at a temperature of 25 ° C. and 50 ° C. in a thermostat at room temperature. The reaction was performed while changing the reaction conditions, and the progress of the reaction was examined. During the reaction, the solution was agitated by shaking the vessel. After a certain period of time, the container was taken out, the liquid and the solid were separated, and the concentration of iodide ions remaining in the solution was measured by ion chromatography.

FIG. 7 of the accompanying drawings shows the relationship between the reaction time and the ratio (%) of residual iodide ions. At any temperature, the reaction proceeded very quickly, and 90% or more of the iodide ion was removed within 15 minutes after the start of the reaction, and reached a substantially constant value. The constant value is 25 ° C
About 95% in the reaction at 50 ° C. and about 93% in the reaction at 50 ° C.
%Met. The above results indicate that the compound BiPbO ₂ (NO
₃ ) shows that the compound acts stably and effectively as an inorganic anion exchanger even in a strongly acidic (pH = 1) solution. Example 11 BiPbO ₂ (NO ₃ ), about 0.1 g (about 2 × 10 ⁻⁴ gram molecule) and 0.1 mol dm ⁻³ NaI solution (Na
PH = 13 using OH solution), 1 ml (I ⁻ :
(About 1 × 10 ⁻⁴ gram ion) was placed in a container with a lid, and allowed to react in a thermostat at 25 ° C. and 50 ° C. for various times, and the progress of the reaction was examined. During the reaction, the solution was agitated by shaking the vessel. After a certain time,
The container was taken out, a liquid and a solid were separated, and the concentration of iodide ion remaining in the solution was measured by ion chromatography.

FIG. 8 of the accompanying drawings shows the relationship between the reaction time and the ratio (%) of residual iodide ions. The reaction proceeded relatively quickly at 25 ° C., and was completed in about 6 hours after the start of the reaction. At this time, about 99.95% of iodide ions were removed. At 50 ° C., the reaction proceeded very quickly, and about 45 minutes after the start of the reaction, about 99.1% and about 99.97% of the iodide ions were removed 2 hours later. The above results indicate that the compound BiPbO ₂ (NO ₃ ) stably and effectively acts as an inorganic anion exchanger even in a strongly alkaline (pH = 13) solution. Example 12 BiPbO ₂ (NO ₃ ), about 2.0 g (about 4 × 10 ⁻³ gram molecule) and 0.05 mol dm ⁻³ NaI solution (p
H = 1 and pH = 13), 10 ml (I ⁻ : about 5
× 10 ^-4 gram ion) and BiPbO ₂ (NO ₃ ),
About 2.0 g (about 4 × 10 ^-3 gram molecule) and 0.005 m
old dm ^-3 NaI solution (adjusted to pH = 1 and pH = 13), 10 ml (I ^-1 : 5 × 10 ^-5 gram ion) was placed in a lidded container, sealed, and placed in a thermostat. 2 at ℃
The reaction was carried out for 4 hours while stirring the vessel. In this embodiment, the ratio of the ion exchanger to iodide ions is increased as compared with Embodiments 6 and 7. Also, the concentration of iodide ions is changed.

Table 7 shows the results. As is clear from Table 7, iodide ions are efficiently removed in both the solutions of pH = 1 and pH = 13.

[0037]

[Table 7] Example 13 In this example, NaI with various pH values was used.
The ion exchange capacity of BiPbO ₂ (NO ₃ ) in the solution was measured. The ion exchange capacity is 1 g of ion exchanger.
It is represented by the number of equivalents (or milligram equivalents) of adsorbed or ion-exchanged ions per unit, and the unit is eqeg ^-1 (equivalents per gram) or meq g ^-1 (milligram equivalents per gram).

About 97 mg of BiPbO ₂ (NO ₃ ) and 1 ml of a 0.2 mol dm ^-3 NaI solution were placed in a container with a lid, and the container was hermetically sealed, and placed in a thermostat at 25 ° C., 50 ° C. and 7 ° C.
The reaction was performed at each temperature of 5 ° C. for 24 hours. During the reaction, the solution was agitated by shaking the vessel. After the reaction, the container was taken out, the liquid and the solid were separated, and the concentration of iodide ions remaining in the solution was measured by ion chromatography to determine the ion exchange capacity. PH of the solution is 1
The pH was adjusted from 13 to 13. The pH was adjusted using a nitric acid solution on the acidic side and a sodium hydroxide solution on the alkaline side.

FIG. 9 of the accompanying drawings shows a temperature range of 25 ° C., 50 ° C.
-Exchange capacity of iodide ions measured at 75 ° C and 75 ° C
And the relationship between pH and the pH of the aqueous solution. This figure 6
The maximum theoretical value of the ion exchange capacity (1.96 meq)
eg^-1) Means BiPbO _Two(NO_Three) (NO_Three)
^-Is all I^-Exchange capacity calculated by replacing with
The value of the quantity.

As is apparent from FIG. 9, the ion exchanger of the present invention exhibits a high ion exchange capacity in acidic and alkaline solutions in the reaction at 25 ° C. and 50 ° C. Further, at a higher temperature, 75 ° C., a high ion exchange capacity is exhibited in any of acidic, neutral, and alkaline regions except for around pH = 2. The value is almost equal to the maximum theoretical value, indicating that almost all of (NO ₃ ) ⁻ has replaced I ⁻ , indicating that the efficiency of ion exchange is very high.

[0041]

As described in detail above, according to the present invention, the ion exchange capacity and the ion exchange rate are large, the acid resistance, the alkali resistance and the heat resistance are excellent, and it is effective in any of acidic, neutral and alkaline aqueous solutions. A novel bismuth lead compound and a material for solidifying and removing inorganic anions such as halide ions such as chloride ions and iodide ions containing the same as an active ingredient are provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a thermogravimetric analysis curve of BiPbO ₂ (NO ₃ ).

FIG. 2 is a diagram showing a mass spectrometry curve. A is a curve showing a partial pressure of NO, B is a partial pressure of O ₂ , C is a partial pressure of CO ₂ , D is a partial pressure of N, and E is a curve showing a partial pressure of O.

FIG. 3 is a view showing a powder X-ray diffraction pattern. When C is the compound Bi ₂ O ₂ (CO ₃ ), B is the compound BiPb
In the case of O 2 I, the case where A is the compound BiPbO ₂ (NO ₃ ).

FIG. 4 is a graph showing the amount of chloride ions remaining in a solution at pH = 1 at various ion exchange reaction times.

FIG. 5: pH = 13 at various ion exchange reaction times
FIG. 5 is a view showing the amount of chloride ions remaining in the solution of Example 1.

FIG. 6 is a graph showing values of ion exchange capacity in solutions having various pHs.

FIG. 7 is a diagram showing the amount of iodide ions remaining in a solution at pH = 1 at various ion exchange reaction times.

FIG. 8: pH = 13 at various ion exchange reaction times
FIG. 4 is a diagram showing the amount of iodide ions remaining in the solution of FIG.

FIG. 9 is a diagram showing values of ion exchange capacity in solutions having various pHs.

Claims (9)

(57) [Claims] 1. A bismuth lead compound represented by BiPbO ₂ (NO ₃ ). 2. The method according to claim 1, wherein the raw material mixture is adjusted to have a molar ratio of about 1: 1: 2: 1 of a bismuth element, a lead element, an oxygen element, and a nitrate group (NO ₃ ). The method for producing a bismuth lead compound according to claim 1, wherein 3. The process for producing a bismuth lead compound according to claim 2, wherein water is added to the raw material mixture to cause a heating reaction. 4. An inorganic anion exchanger comprising a bismuth lead compound represented by BiPbO ₂ (NO ₃ ) as an active ingredient. 5. A halide ion exchanger comprising the ion exchanger according to claim 4. 6. The halide ion exchanger according to claim 5, wherein the halide ion is a chloride ion or an iodide ion. 7. A method for removing inorganic anions, comprising removing inorganic anions with the compound according to claim 1 or the inorganic anion exchanger according to claim 4. 8. The method according to claim 7, wherein the inorganic anion is a halide ion. 9. The method according to claim 8, wherein chloride ions or iodide ions are removed.