JPH05169066A - Production of sterilizing cleaner - Google Patents

Abstract

PURPOSE:To produce a sterilizing cleaner useful in preventing the putrefaction of the drinking water filter medium, flower-arrangement water, etc. CONSTITUTION:Coral sand is immersed in an aq. soln. of copper salts, the basic copper carbonate formed on the surface is reduced by aq. hydrogen peroxide or thermally decomposed into copper and/or copper oxides, and the product is stuck to the surface of coral sand.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a sterilizing purifying agent, and more particularly to a method for producing a sterilizing purifying agent which is useful as a filter medium for drinking water, for fresh flowers, and for preventing water spoilage.

[0002]

2. Description of the Related Art It is already well known that a material such as activated carbon, pumice, coral sand or the like having silver adhering to the surface thereof is used as a bactericide for water treatment. Regarding this manufacturing method, silver nitrate is dissolved in ammonia water to form a silver ammonia complex salt, the base material is immersed in this solution, and then a reducing solution such as formalin and glucose is added to this solution, and silver is deposited on the substrate by this reaction. It is generally used to make it by the so-called silver mirror reaction method.

[0003]

However, in the case of this silver mirror reaction method, heating is required to accelerate the reaction rate, and the operation is complicated and various reagents are required, resulting in high cost. In addition to this, in this case, there is a disadvantage that it is necessary to consider the treatment of organic wastewater. Further, as this sterilizing purifying agent, one in which copper is impregnated on activated carbon is also known (see JP-A-60-34789), but this one impregnates cuprous oxide by applying a so-called Fehling reaction. The use of three kinds of chemicals is necessary because it is used, and there is a disadvantage that minerals such as calcium are not eluted because the base material is activated carbon.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a method for producing a sterilizing purifying agent which solves such disadvantages, which involves immersing coral sand in an aqueous solution of copper salts to form a basic substance formed on the surface thereof. Characterized by decomposing and reducing copper carbonate by adding hydrogen peroxide water or thermally decomposing this basic copper carbonate and fusing the copper or copper oxide generated here to the coral sand surface Is.

That is, as a result of various investigations by the present inventor on a method for inexpensively producing a sterilizing purification agent by using naturally occurring coral sand as a base material, the coral sand was used as a copper salt,
For example, if it is immersed in an aqueous solution of cuprous chloride, since this coral sand is mainly composed of calcium carbonate, basic green copper carbonate of light green will cover the surface of the coral sand. If hydrogen peroxide water is added while stirring, the reduction action immediately causes dark red copper and oxidation.
Copper is produced. In addition, basic copper carbonate was similarly stirred as a reagent, and a sufficiently dried product was subjected to a continuity test using a tester.As a result, a slight electric current was observed. known. As an alternative method, if this basic carbonate is heated to about 250 ° C in the atmosphere, black cupric oxide is produced, and this copper or copper oxide is deposited on the surface of coral sand. The present invention has been completed by finding that it is possible to easily obtain a sterilizing purification agent in which copper is deposited on the surface. This will be described in more detail below.

[0006]

The present invention relates to a method for producing a sterilizing purification agent, in which coral sand is immersed in an aqueous solution of copper salts to form basic copper carbonate on the surface thereof, and the basic copper carbonate is converted into hydrogen peroxide. It is reduced with water or decomposed by heating to produce copper or copper oxide, which is deposited on coral sand, which is sterilized by depositing copper or copper compound on the surface of coral sand. This provides an advantage that the purifying agent for use can be obtained easily and inexpensively.

The production of the sterilizing agent according to the present invention is as follows.
It is performed by immersing coral sand in an aqueous solution of copper salts. The reaction between the coral sand and the copper salt aqueous solution may be carried out by pouring the copper salt aqueous solution into the coral sand and stirring the mixture to release air bubbles so that the surface of the coral sand is in sufficient contact with the copper salt aqueous solution. According to the method, coral sand reacts with an aqueous solution of copper salts, and basic copper carbonate is produced in a short time.

As the copper salt compound used here, since it reacts with coral sand as a calcium carbonate agent at room temperature to form basic copper carbonate, cuprous chloride dihydrate, copper nitrate and the like are recommended. However, copper sulfate is not preferred because it produces calcium sulfate (gypsum) when it reacts with coral sand, which interferes with subsequent reactions. Also,
The amount of copper salts used here should be 0.4 to 3% of the amount of copper attached to coral sand as a sterilizing purifying agent, so 2 parts of cuprous chloride should be added to 100 parts by weight of coral sand.
In the case of water salt, 1.1 to 8.3 parts by weight may be dissolved in 65 parts by weight of water.

The basic copper carbonate thus produced is then required to be reduced or decomposed into copper or copper oxide which is useful as a sterilizing agent adhering agent. In the present invention, the decomposition is carried out by adding hydrogen peroxide or heating it at about 250 ° C.

The reduction with the hydrogen peroxide solution may be carried out by adding the hydrogen peroxide solution to the basic copper carbonate formed on the surface of the coral sand while stirring, whereby the basic copper carbonate is immediately reduced. Brown and dark red copper and cuprous oxide are deposited on the surface of the coral sand.
The desired sterilizing agent can be obtained by drying at ℃. The basic copper carbonate can be heated and pyrolyzed by heating the basic copper carbonate generated on the surface of the coral sand to about 250 ° C in the atmosphere. It decomposes into black cupric oxide, which deposits on the surface of the coral sand, and can be used as it is as a sterilizing agent.

The sterilizing agent thus prepared is made by impregnating the surface of coral sand with copper or copper oxide. When this is put into water, copper ions are eluted into the water. , Copper ion is sterilized and purified, but copper is specified as a food additive as a trace element essential for human body, and the concentration of copper in dewatered water that is discharged during the manufacturing process is There is no risk of pollution because it is within the drainage standards for pollution items.

[0012]

[Examples] Examples of the present invention will be given below. The test results of the sterilizing agent prepared by the present invention are shown by the following test methods. (Test method) Coral sand impregnated with 0.4% copper was used as the sample, and the sample was placed in a flask containing 50 ml of sterilized purified water.
Add 0 g (20%) and 25 g (50%), add 0.1 ml of the test bacteria and leave at 23-25 ° C for 5 minutes, 15 minutes, 30 minutes.
The number of bacteria after the minute was counted.

Example A solution prepared by dissolving 12 g of cuprous chloride dihydrate in 650 ml of water was added to 1 kg of coral sand while stirring and reacted for 1 hour. When the reaction was completed, a base was formed on the surface of the coral sand. Copper carbonate was produced. Then, 250 ml of 10% hydrogen peroxide was added to this basic copper carbonate while stirring, and the basic copper carbonate was immediately reduced to a mixture of brown copper and cuprous oxide, which was the surface of the coral sand. As a result, it was dehydrated, washed with water, and dried at 100 to 150 ° C to obtain a sterilizing purification agent.

The basic copper carbonate generated on the surface of the coral sand was heated at about 250 ° C. for about 30 minutes separately from the above, and became black cupric oxide, which was attached to the surface of the coral sand. Therefore, it could be used as a sterilizing cleaning agent.

Next, the sterilizing purification agent 10 thus obtained
When the copper content and the copper recovery rate for 0 g were compared, the results shown in Table 1 were obtained.
When soaked in 1 liter of water for 24 hours, the amount of copper ions (Cu ²⁺ ) in this water is 0.1 to 0.3 ppm, which is the highest from the viewpoint of drinking water quality standard of 1.0 ppm, and the sterilizing effect by this As a result, the results shown in Table 2 were obtained.

[0016]

[Table 1]

[Table 2]

[0017]

Industrial Applicability The present invention relates to a method for producing a sterilizing purifying agent. As described above, coral sand is immersed in an aqueous solution of copper salts, and basic copper carbonate formed on the surface thereof is hydrogen peroxide solution. It is characterized in that it is reduced with or is thermally decomposed by heating to give copper or copper oxide, which is attached to the surface of coral sand. According to this, formation of basic copper carbonate, Advantageous in that the reduction and decomposition of basic copper carbonate does not proceed in a clean reaction and no reaction residue is generated, and the desired sterilizing purification agent can be obtained industrially very easily, safely and inexpensively. Is given.

Claims (2)

[Claims] 1. Coral sand is immersed in an aqueous solution of copper salts, basic copper carbonate formed on the surface is decomposed by addition of hydrogen peroxide solution, and reduced, and copper and copper oxide are attached to the surface of the coral sand. A method for producing a sterilizing cleaning agent, which comprises: 2. A sterilizing purification method characterized in that coral sand is immersed in an aqueous solution of copper salts, basic copper carbonate formed on the surface is decomposed by heating, and copper oxide is attached to the surface of the coral sand. Method of manufacturing agent.