JP6608266B2 - Platinum group metal colloidal particle recovery material, filter including the recovery material, and platinum group metal colloidal particle recovery method using the recovery material - Google Patents

Description

  The present invention relates to a platinum group metal colloid particle recovery material, a filter including the recovery material, and a method for recovering platinum group metal colloid particles using the recovery material.

  For example, when manufacturing a printed wiring board, electroless plating is widely performed. Among them, electroless plating using a noble metal is performed on wiring junctions, electrical contact parts, and the like. Conventionally, gold plating has been the mainstream in such surface treatment. However, although gold is excellent in conductivity and bonding properties, it is very expensive. Therefore, in recent years, electroless plating using a cheaper platinum group metal has been developed and adopted.

  The process of performing electroless platinum group metal plating is generally located in the latter part of the production line for electronic components, and in the former part, there is a process of performing copper plating for forming wiring, nickel plating for forming a base, or the like. . A water washing process is provided between the various plating processes, and continuously produced electronic components are washed after each plating process is completed. However, the components of the previous plating process may be brought into the next plating process even by cleaning. In the process of electroless plating of a platinum group metal, copper or the like may be brought in from the previous plating process. In the platinum group metal electroless plating process, if a very small amount of copper or the like is mixed, the influence of the platinum group metal plating is greatly affected, resulting in product defects. For this reason, in the case where copper is mixed in the electroless plating solution and the precipitation of the platinum group metal is reduced, it is necessary to renew a part or the whole of the plating solution, including the used platinum group metal. A plating solution waste solution is generated. In recent years, it is known that a plating solution containing platinum group metal colloidal particles is used as a plating solution when performing electroless platinum group metal plating, and a waste solution of the plating solution is similarly generated.

  In addition, when performing electroless plating using a metal other than a noble metal, such as copper or nickel, from the viewpoint of strengthening the bond between the metal plating and the material to be plated, a catalyst metal serving as the core of electroless plating is applied. It is widely done. It is known to use platinum group metal colloidal particles as the catalyst metal. And the catalyst liquid containing the platinum group metal colloidal particles also generates a waste liquid of the catalyst liquid containing the used platinum group metal colloidal particles, like the electroless platinum group metal plating liquid described above.

  On the other hand, attempts have been made to recover platinum group metals from waste liquids containing platinum group metal colloidal particles as described above.

  For example, a method of recovering a platinum group metal from a solution containing a platinum group metal in a colloidal state by electrolytic reduction, adding an electrolytic pretreatment agent to the solution, and dissolving the colloidal particles to ionize the platinum group metal. A method for recovering a platinum group metal is known in which a platinum group metal is deposited and recovered by performing electrolytic reduction on the product that has been made into a state (see, for example, Patent Document 1).

JP 2001-59195 A

  However, the platinum group metal recovery method disclosed in Patent Document 1 requires electrolytic reduction, which complicates the process and requires an apparatus for electrolytic reduction, which is not practical. It was.

  The present invention solves the above-mentioned problems and recovers platinum group metal colloid particles in a solution containing platinum group metal colloid particles without requiring a complicated apparatus or process as disclosed in Patent Document 1. It is an object of the present invention to provide a platinum group metal colloidal particle recovery material that is excellent in the above.

  The inventors of the present invention focused on activated carbon, which is not good at adsorbing colloids originally dispersed in a solution, as a recovery material. As a result of intensive studies by the present inventors, surprisingly, as a platinum group metal colloidal particle recovery material, a pore diameter of 35 to 110 mm in a pore distribution determined by the BJH method from a nitrogen desorption isotherm at a temperature of 77.4K. In the case where activated carbon having a pore volume in the range of 0.07 ml / g or more is used, a solution containing a platinum group metal without requiring a complicated apparatus or process as disclosed in Patent Document 1 above. It has been found that the platinum group metal recovery effect is excellent. The present invention has been completed by further studies based on these findings.

That is, this invention provides the invention of the aspect hung up below.
Item 1. A recovery material for the platinum group metal colloid particles in a solution containing platinum group metal colloid particles, wherein the recovery material has a pore distribution determined by a BJH method from a nitrogen desorption isotherm at a temperature of 77.4K. A platinum group metal colloidal particle recovery material, which is activated carbon having a pore volume in the range of 35 to 110 mm in diameter of 0.07 ml / g or more.
Item 2. Item 2. The platinum group metal colloid particle recovery material according to Item 1, wherein the pH of the solution is 9 or more.
Item 3. Item 3. The platinum group metal colloid particle recovery material according to Item 1 or 2, wherein the solution is a catalyst solution in electroless plating.
Item 4. Item 3. The platinum group metal colloid particle recovery material according to Item 1 or 2, wherein the solution is an electroless palladium plating solution.
Item 5. Item 5. The platinum group metal colloid particle recovery material according to any one of Items 1 to 4, wherein a content of the solution before recovery of the platinum group metal colloid particles is 1-1000 mg / L.
Item 6. Item 6. The platinum group metal colloid particle recovery material according to any one of Items 1 to 5, wherein the platinum group metal colloid particles are palladium colloid particles.
Item 7. Item 7. A filter comprising the platinum group metal colloid particle recovery material according to any one of items 1 to 6.
Item 8. Item 7. A method for recovering the platinum group metal colloidal particles from a solution containing the platinum group metal colloidal particles using the platinum group metal colloidal particle recovery material according to any one of Items 1-6.

  According to the platinum group metal colloidal particle recovery material of the present invention, the pore volume in the range of pore diameters of 35 to 110 mm in the pore distribution determined by the BJH method from the nitrogen desorption isotherm at a temperature of 77.4K is 0.07 ml / Since the activated carbon is equal to or more than g, recovery of platinum group metal colloid particles in a solution containing platinum group metal colloid particles without requiring a complicated process or apparatus as disclosed in Patent Document 1 above, for example. Excellent effect. Therefore, for example, the platinum group metal colloid particles can be efficiently recovered from the waste liquid of the electroless plating solution containing the platinum group metal colloid particles and the catalyst solution containing the platinum group metal colloid particles, thereby contributing to resource recycling. It also becomes possible to contribute to cost reduction.

It is a figure which shows the correlation with the light absorbency in wavelength 340nm of a spectrophotometer, and the density | concentration of a palladium colloid particle. It is a figure which shows the relationship between the pore volume of the range of 35-110 mm of pore diameters, and collection | recovery performance of the platinum group metal colloid particle collection material in an Example.

1. Platinum group metal colloidal particle recovery material The platinum group metal colloidal particle recovery material of the present invention has a pore distribution in the pore diameter range of 35 to 110 mm in the pore distribution determined by the BJH method from the nitrogen desorption isotherm at a temperature of 77.4K. The activated carbon has a volume of 0.07 ml / g or more. By making the volume of the pores having a pore diameter in a specific range 0.07 ml / g or more, the recovery effect of the platinum group metal colloid particles in the solution containing the platinum group metal colloid particles is excellent. From the viewpoint of further improving the effect, the platinum group metal colloidal particle recovery material of the present invention has a pore diameter of 35 to 35 in a pore distribution determined by the BJH method from a nitrogen desorption isotherm at a temperature of 77.4K. The pore volume in the range of 110 kg is preferably 0.09 ml / g or more, more preferably 0.095 or more, and still more preferably 0.100 or more. Further, from the viewpoint of further improving the handleability of the recovered material while further improving the above effect, in the pore distribution determined by the BJH method from the nitrogen desorption isotherm at a temperature of 77.4 K, the pore diameter of 35 It is preferable that the pore volume in the range of ˜110 mm is 0.100 to 0.600 ml / g.

The specific surface area of the platinum group metal colloid particle recovery material of the present invention (value measured by the BET method (one-point method) using nitrogen as an adsorbed substance) is not particularly limited, but contains platinum group metal colloid particles. From the viewpoint of further improving the handleability of the recovered material, while being excellent in the recovery effect of the platinum group metal colloid particles in the solution, preferably about 1000 to 3500 m ² / g, more preferably about 1200 to 3000 m ² / g. Can be mentioned.

In the present invention, the pore distribution of the activated carbon is calculated based on the nitrogen desorption isotherm at a temperature of 77.4K. Specifically, the nitrogen desorption isotherm is created as follows. The activated carbon is cooled to a temperature of 77.4K (the boiling point of nitrogen), nitrogen gas is introduced, and the desorption amount V [ml / g] of the nitrogen gas is measured by a volumetric method. At this time, the pressure P [mmHg] of the introduced nitrogen gas is gradually increased, and the value obtained by dividing by the saturated vapor pressure P ₀ [mmHg] of the nitrogen gas is set as the relative pressure P / P ₀ , and the desorption amount with respect to each relative pressure is plotted. This creates a nitrogen desorption isotherm. The desorption amount of nitrogen gas can be carried out using a commercially available automatic gas desorption amount measuring apparatus (trade name “AUTOSORB-6” (manufactured by QUANTACHROME)). From the pore distribution, the pore volume (ml / g) in the range of pore diameters of 30 mm to 50 mm can be calculated using a known means such as an analysis program attached to the above apparatus. The total pore volume of the activated carbon can be calculated from the maximum desorption amount of nitrogen in the measurement result of the desorption amount of nitrogen gas.

  The total pore volume of the platinum group metal colloidal particle recovery material of the present invention is not particularly limited, but it is excellent in the recovery effect of the platinum group metal colloidal particles in the solution containing the platinum group metal colloidal particles while handling the recovery material. From the standpoint of further improving the properties, it is preferably about 0.4 to 1.5 ml / g. The total pore volume of the fibrous activated carbon is a value measured by the method described above.

  In the platinum group metal colloidal particle recovery material of the present invention, the ratio of the pore volume (ml / g) in the range of pore diameters of 35 to 110 mm to the total pore volume (ml / g) (pore diameter of 35 to 110 mm). (Pore volume / total pore volume) is preferably 0.05 or more.

  In the pore distribution obtained by the BJH method from the nitrogen desorption isotherm at a temperature of 77.4K, as a method for producing activated carbon having a pore volume in the range of 35 to 110 mm in pore diameter is 0.07 ml / g or more, Although it does not specifically limit, For example, the following methods are mentioned. That is, an activated carbon precursor composed of a pitch containing 0.01 to 5% by weight of at least one metal component of Mg, Mn, Fe, Y, Pt, and Gd is subjected to infusibilization treatment and carbonization treatment, and an atmospheric temperature of 800 Examples include a method obtained by a production method including an activation treatment step performed at ˜1000 ° C. and a cooling step of cooling to room temperature in the presence of air after the activation treatment step. The raw material for the platinum group metal colloidal particle recovery material of the present invention is not particularly limited, and wood, sawdust, coconut shell, polyacrylonitrile, cellulose, phenol resin, petroleum pitch, coal pitch, and the like can be used. Moreover, the shape of the activated carbon of this invention is not specifically limited, For example, a powder form, a granular form, a fibrous form etc. are mentioned.

  The platinum group metal colloid particle recovery material of the present invention adsorbs platinum group metal colloid particles with a specific activated carbon from a solution containing the platinum group metal colloid particles before recovery. Therefore, for example, it can also be used for the purpose of removing platinum group metal colloidal particles from the solution.

Filter containing platinum group metal colloidal particle recovery material The filter of the present invention includes the platinum group metal colloidal particle recovery material of the present invention. The content of the platinum group metal colloid particle recovery material of the present invention is not particularly limited. For example, the platinum group metal colloidal particle recovery material of the present invention is filled in a container as it is, or the platinum group metal colloidal particle recovery material of the present invention is molded. Examples of the molded body include known ones. For example, a nonwoven fabric obtained by a wet papermaking method, a dry method, a sheet made of the nonwoven fabric, a cylindrical or columnar filter obtained by winding the nonwoven fabric, a fiber, and the like Examples thereof include a cylindrical or columnar filter obtained by a so-called wet molding method in which a molding die having a suction port is placed in an aqueous slurry containing glassy activated carbon and sucked from the suction port and molded.

Solution containing platinum group metal colloidal particles In the present invention, examples of the platinum group metal constituting the platinum group metal colloidal particles include ruthenium, rhodium, palladium, osmium, iridium, and platinum. Among these, palladium is particularly preferable from the viewpoint of excellent recovery effect of the platinum group metal colloidal particles.

  Although it does not restrict | limit especially as a palladium colloid, From a viewpoint that the collection | recovery effect of the palladium colloid particle in the solution containing a palladium colloid particle is exhibited further, what does not contain tin substantially is preferable. In the present invention, “substantially does not contain” preferably means that the content of the target substance in the solution is 10 ppm or less.

  In the present invention, the content before recovery of the platinum group metal colloid particles in the solution containing the platinum group metal colloid particles is not particularly limited, and examples thereof include 1 to 1000 mg / L, and 50 to 500 mg / L. More preferably.

  In the present invention, the solution containing the platinum group metal colloid particles may contain a dispersing agent for dispersing the platinum group metal colloid particles and a reducing agent. The dispersant may be a known one, for example, a polymer surfactant such as polyethylene glycol, polyvinyl pyrrolidone, polyvinyl alcohol, polyethyleneimine and polyacrylic acid, an anionic surfactant such as sodium dodecyl sulfate, and a cationic surfactant. Agents, amphoteric surfactants and the like. The reducing agent may be a known one, for example, hypophosphorous acid and its salt, borohydride and its salt (for example, sodium salt, potassium salt, ammonium salt, etc.), dimethylamine borane, trimethylamine. For example, borane.

  In the present invention, the content of the platinum group metal colloidal particles is measured according to JIS K 0102 2013 5.5 by adding 2.5 ml of 5% nitric acid to 10 ml of the sample and heating at 100 ° C. for 1 hour. After cooling to room temperature, ultra-pure water is added to make a pre-treatment of 50 ml, and measurement is performed using an yttrium solution as an internal standard solution in accordance with the ICP emission spectroscopic analysis method defined in JIS K 0102 2013 52.4. . When the concentration of the platinum group metal colloidal particles is 0.05 ppm or less and measurement is impossible by the ICP emission spectroscopic analysis method, an yttrium solution is used as an internal standard solution according to JIS K 0102 2013 52.5 ICP mass spectrometry. Use to measure. Further, the measurement of the content of the metal carrier and / or metal compound described later is performed in the same manner.

  In the present invention, the solution containing the platinum group metal colloidal particles may contain a metal carrier and / or a metal compound. As a metal element which comprises a metal carrier and / or a metal compound, copper, nickel, silver, gold | metal | money etc. may be contained other than a platinum group metal, for example. The content of the metal carrier and / or metal compound in the solution containing platinum group metal colloidal particles is, for example, 30 ppm or less, and preferably 10 ppm or less.

  In the present invention, the pH of the solution containing the platinum group metal colloid particles is not particularly limited as long as the recovered platinum group metal colloid can stably exist, but the platinum in the solution containing the platinum group metal colloid particles is not limited. From the viewpoint of further exerting the group metal colloid particle recovery effect, the pH is preferably 8 or more, more preferably 9 or more, and particularly preferably 9 to 13.

  The platinum group metal colloidal particle recovery material of the present invention has a pore volume in the range of a pore diameter of 35 to 110 mm in a pore distribution determined by the BJH method from a nitrogen desorption isotherm at a temperature of 77.4K of 0.07 ml / g or more. Therefore, the recovery effect of the platinum group metal colloid particles in the solution containing the platinum group metal colloid particles can be obtained without requiring a complicated process or apparatus as disclosed in Patent Document 1, for example. Excellent. Accordingly, even when the solution containing the platinum group metal colloid particles is, for example, a catalyst solution in electroless plating or an electroless palladium plating solution, the platinum group metal colloid particles can be efficiently recovered. In particular, when the catalyst solution or electroless palladium plating solution in electroless plating is a used one that is used as a waste solution, the above effect is further enhanced, contributing to resource recycling and reducing costs. It is possible to further contribute to the above.

Performance of platinum group metal colloidal particle recovery material The platinum group metal colloidal particle recovery material of the present invention has a fine pore diameter in the range of 35 to 110 mm in the pore distribution determined by the BJH method from the nitrogen desorption isotherm at a temperature of 77.4K. Since the activated carbon having a pore volume of 0.07 ml / g or more is used, the recovery performance of the platinum group metal colloid particles in the solution containing the platinum group metal colloid particles is excellent. Specifically, the recovery performance of the platinum group metal colloidal particle recovery material of the present invention is preferably 20% or more, more preferably 40% or more, and more preferably 60%, as measured by the following evaluation method. The above is more preferable, and 90% or more is particularly preferable.

<Evaluation method of recovery performance>
As a solution containing platinum group metal colloid particles, the content of palladium colloid particles is 170 mg / L, the total concentration of substances other than palladium colloid particles is substantially not contained, the pH is 10 and the temperature is 30 ° C. A blank is measured, and the absorbance A of the blank is measured by the following measurement method. Next, 1 g of the platinum group metal colloidal particle recovery material is put into 100 ml of a blank solution, and the condition is that the shaking speed is 140 rpm with a shaker (trade name Bio-Shaker BR-300L manufactured by Taitec Co., Ltd.) while maintaining the temperature. Shake for 2 hours. The shaken liquid is filtered to remove the platinum group metal colloidal particle recovery material, and the absorbance A ′ of the liquid from which the recovery material has been removed is measured by the following method. The absorbances A and A ′ are expressed by the following formula (1): And the obtained value P (%) is taken as the removal rate of the platinum group metal colloid particle recovery material.
P (%) = {1- (A ′ / A)} × 100 (1)
<Absorbance measurement method>
The liquid to be measured is diluted 7-fold with pure water, and the absorbance (abs) at a wavelength of 340 nm is measured using a spectrophotometer (JASCO Corporation V-650 type) at a temperature of 30 ° C.
<Correlation between palladium concentration and absorbance>
In evaluating the palladium colloid particle recovery performance by the above absorbance measurement, four solutions containing palladium colloid particles having arbitrarily different concentrations were prepared in advance, and the respective absorbances at a wavelength of 340 nm were measured. A strong positive correlation was found between the absorbance and the correlation coefficient R = 0.998. The correlation is shown in FIG.

Method of recovering platinum group metal colloidal particles The method of recovering platinum group metal colloidal particles of the present invention uses the platinum group metal colloidal particle recovery material of the present invention. As a method for contacting the recovered material with the solution containing platinum group metal colloidal particles, for example, a liquid passing method in which the solution containing platinum group metal colloidal particles is continuously passed using the recovered material as a filter, for example. And a shaking method in which the recovered material is put into a solution containing platinum group metal colloidal particles and shaken for a predetermined time.

  In the method for recovering platinum group metal colloidal particles of the present invention, the preferred embodiment of the solution containing the platinum group metal colloidal particles from which the platinum group metal colloidal particles are to be recovered is as described above. For example, the content before recovery of the platinum group metal colloidal particles is not particularly limited, but may be 1-1000 mg / L, and the pH of the solution is preferably 8 or more.

  As a method for recovering the platinum group metal from the platinum group metal colloid particle recovery material of the present invention, in which the platinum group metal colloid particles are recovered, a known method may be used, for example, a platinum group metal salt with an inorganic strong acid such as aqua regia. A method of recovering as a platinum group metal by dissociation, hydrogen reduction or electroreduction, or ashing by burning the platinum group metal colloidal particle recovery material of the present invention adsorbing the platinum group metal from the obtained ash Examples include a method of extracting and reducing a platinum group metal with an inorganic strong acid such as aqua regia.

  Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples. However, the present invention is not limited to the examples.

1. Evaluation method (1) Pore volume (ml / g) in the range of pore diameter of 35 to 110 mm in pore distribution determined by BJH method from nitrogen desorption isotherm at temperature of 77.4K of platinum group metal colloid particle recovery material , Total pore volume (ml / g), specific surface area (m ² / g)
It was determined by the method described above.
(2) Evaluation method of recovery performance It was determined by the method described above.

Example 1
As a platinum group metal colloidal particle recovery material, activated carbon fiber W-15W manufactured by Unitika Co., Ltd. (pores having a pore diameter in the range of 35 to 110 mm in pore distribution determined by BJH method from nitrogen desorption isotherm at temperature 77.4K) The volume was 0.48 ml / g, the total pore volume was 0.97 ml / g, and the specific surface area was 1300 m ² / g). As a solution containing platinum group metal colloidal particles, the content of palladium colloidal particles is 170 mg / L, the total concentration of substances other than palladium colloidal particles is not substantially contained, the pH is 11, and the temperature is 30 ° C. Absorbance A of the blank was measured by the measurement method described above. Next, 1 g of the platinum group metal colloid particle recovery material is put into 100 ml of a blank solution, and the shaking speed is 140 rpm with a shaker (trade name Bio-Shaker BR-300L, manufactured by Taitec Corporation) while maintaining the temperature. Shake for 2 hours under conditions. Then, the shaken liquid is filtered to remove the platinum group metal colloidal particle recovery material, the absorbance A ′ of the liquid from which the recovery material has been removed is measured by the measurement method described above, and the absorbances A and A ′ are calculated using the formulas described above. Substituting into (1), the obtained value P (%) was taken as the removal rate of the platinum group metal colloid particle recovery material.

(Example 2)
As a platinum group metal colloid recovery material, instead of the activated carbon fiber W-15W manufactured by Unitika Ltd., the activated carbon fiber W-10W manufactured by Unitika Ltd. (in the pore distribution determined by the BJH method from the nitrogen desorption isotherm at a temperature of 77.4K) Except that the pore volume in the range of 35 to 110 mm in pore diameter was 0.092 ml / g, the total pore volume was 0.60 ml / g, and the specific surface area was 1100 m ² / g). It was done.

(Example 3)
As the platinum group metal colloid recovery material, instead of the activated carbon fiber W-15W manufactured by Unitika Ltd., the activated carbon fiber A-20 manufactured by Unitika Ltd. (in the pore distribution determined by the BJH method from the nitrogen desorption isotherm at a temperature of 77.4K) , Except that the pore volume in the range of pore diameters of 35 to 110 mm was 0.07 ml / g, the total pore volume was 1.15 ml / g, and the specific surface area was 2000 m ² / g). It was done.

Example 4
As a platinum group metal colloid recovery material, instead of activated carbon fiber W-15W manufactured by Unitika Co., Ltd., activated carbon Maxsorb (registered trademark) MSC30 manufactured by Kansai Thermochemical Co., Ltd. (determined by BJH method from nitrogen desorption isotherm at temperature 77.4K) In the pore distribution, the pore volume in the range of pore diameters of 35 to 110 mm was 0.100 ml / g, the total pore volume was 1.70 ml / g, and the specific surface area was 3000 m ² / g). The same operation as in Example 1 was performed.

(Example 5)
As a platinum group metal colloid recovery material, instead of the activated carbon fiber W-15W manufactured by Unitika Co., Ltd., activated carbon Hakuho (registered trademark) WH2c manufactured by Osaka Gas Chemical Co., Ltd. The pore distribution was performed except that the pore volume in the range of 35 to 110 mm in pore diameter was 0.096 ml / g, the total pore volume was 0.92 ml / g, and the specific surface area was 1700 m ² / g). As in Example 1.

(Comparative Example 1)
As a platinum group metal colloid recovery material, instead of activated carbon fiber W-15W manufactured by Unitika Ltd., activated carbon fiber A-10 manufactured by Unitika Ltd. (in the pore distribution determined by the BJH method from the nitrogen desorption isotherm at a temperature of 77.4K) Except that the pore volume in the range of 35 to 110 mm in pore diameter was 0.01 ml / g, the total pore volume was 0.56 ml / g, and the specific surface area was 1300 m ² / g). It was done.

(Comparative Example 2)
As the platinum group metal colloid recovery material, instead of the activated carbon fiber W-15W manufactured by Unitika Ltd., activated carbon fiber A-15 manufactured by Unitika Ltd. (in the pore distribution determined by the BJH method from the nitrogen desorption isotherm at a temperature of 77.4K) , Except that the pore volume in the range of pore diameters of 35 to 110 mm was 0.03 ml / g, the total pore volume was 0.84 ml / g, and the specific surface area was 1700 m ² / g). It was done.

  Table 1 shows the physical properties of each example and comparative example. In each example and comparative example, in the pore distribution obtained by the BJH method from the nitrogen desorption isotherm at a temperature of 77.4K, the relationship between the pore volume in the range of the pore diameter of 35 to 110 mm and the recovery performance is as follows. The graph shown is shown in FIG.

The platinum group metal colloid recovery materials of Examples 1 to 5 have a pore volume in the range of a pore diameter of 35 to 110 mm in a pore distribution determined by the BJH method from a nitrogen desorption isotherm at a temperature of 77.4K, which is 0.00. Since the activated carbon was 07 ml / g or more, the recovery effect of the platinum group metal colloid particles in the solution containing the platinum group metal colloid particles was excellent. In particular, as shown in FIG. 2, from the results of Examples 1 to 5 and Comparative Examples 1 and 2, when the pore volume in the range of the pore diameter of 35 to 110 mm is 0.07 ml / g or more, the above effect is obtained. It became clear that it was remarkably superior.

Claims (9)

A recovery material for the platinum group metal colloid particles in a solution containing platinum group metal colloid particles,
The recovered material is activated carbon having a pore volume in a range of 35 to 110 mm in pore diameter of 0.07 ml / g or more in a pore distribution determined by a BJH method from a nitrogen desorption isotherm at a temperature of 77.4K. , Platinum group metal colloidal particle recovery material. The recovered material is activated carbon having a pore volume within a range of 35 to 110 mm in pore diameter of 0.09 ml / g or more in a pore distribution determined by a BJH method from a nitrogen desorption isotherm at a temperature of 77.4K. The platinum group metal colloidal particle recovery material according to claim 1. The platinum group metal colloidal particle recovery material according to claim 1 or 2 , wherein the pH of the solution is 9 or more. The platinum group metal colloidal particle recovery material according to any one of claims 1 to 3 , wherein the solution is a catalyst solution in electroless plating. The platinum group metal colloid particle recovery material according to any one of claims 1 to 3 , wherein the solution is an electroless palladium plating solution. The platinum group metal colloid particle recovery material according to any one of claims 1 to 5 , wherein a content of the solution before recovery of the platinum group metal colloid particles is 1-1000 mg / L. The platinum group metal colloid particle recovery material according to any one of claims 1 to 6 , wherein the platinum group metal colloid particles are palladium colloid particles. A filter comprising the platinum group metal colloidal particle recovery material according to any one of claims 1 to 7 . A method for recovering the platinum group metal colloidal particles from a solution containing the platinum group metal colloidal particles using the platinum group metal colloidal particle recovery material according to any one of claims 1 to 7 .