PRODUCTION OF METAL BORATES WITH NANO-DIMENSION

Abstract

A metal borate production method is realized by the reaction, M(NO.sub.3)+Na.sub.2B.sub.4O.sub.7.10H.sub.2O.fwdarw.M.B.sub.2O.sub.3. nH.sub.2O+NaNO.sub.3+nH.sub.2O, between borax and perchlorate or nitrate solution comprising a metal, or another completely dissolved metal salt in stochiometric proportion and the synthesis of nano-structured metal borates having antibacterial characteristic without addition of a second. solvent or additive substance to the medium.

Claims

1. A metal borate production method, wherein a reaction between borax and perchlorate or a nitrate solution comprising a metal is conducted by the following equation:
M(NO.sub.3)+Na.sub.2B.sub.4O.sub.7.10H.sub.2O=M.B.sub.2O.sub.3.nH.sub.2O+NaNO.sub.3+nH.sub.2O the metal borate production method is realized in a stoichiometric proportion and a synthesis of nano-structured metal borates having antibacterial characteristic without addition of a second solvent or additive substance to a reaction medium, and comprises the following steps: adjusting reactive amounts of metal perchlorate or the nitrate solution and a borax compound to be at a value between 1:1 and 2:1 by mole in a manner compliant to a reaction stoichiometry; adding the borax compound to the metal perchlorate or the nitrate solution with adjusted amounts and applying a mixing process at a value between 25 rpm and 250 rpm; conducting the reaction for at least 2 hours at a fixed temperature to obtain precipitation; applying washing, filtration and drying processes to the precipitation obtained as a result of the reaction to obtain a final product; applying a sintering process the final product between temperatures 400° C. and 1500° C.

2. The metal borate production method according to claim 1, wherein the metal in the nitrate solution is Zn, Cu having +2 ion valence, and Ag having ±1 ion valence.

3. The metal borate production method according to claim 1, wherein the fixed temperature in the reaction is selected from a range between 40° C. and 90° C.

4. The metal borate production method according to claim 1, wherein a pH of the reaction medium is at a value between 6 and 8.

5. The metal borate production method according to claim 1, wherein the sintering process is realized at a fixed temperature for between 2 and 24 hours.

6. A nano-structured metal borate compound product obtained by the metal borate production method according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In FIGS. 1A-1C, XRD images of silver borate, copper borate and zinc borates obtained by means of the subject matter method are given.

[0029] In FIGS. 2A-2C, SEM images of silver borate, copper borate and zinc borates obtained by means of the subject matter method are given.

[0030] In FIGS. 3A-3C, IDX images of silver borate, copper borate and zinc borates obtained by means of the subject matter method are given.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] In this detailed description, the subject matter relates to production of nano-dimension metal borates which have various usage areas, and is explained with references to examples without forming any restrictive effect only in order to make the subject more understandable.

[0032] Said invention essentially relates to production of metal borates by means of a simple precipitation method which does not need high energy like high temperature and extra media like inert gases and complicated devices.

[0033] The present invention provides easing of productions of metal borates present in the art and decrease of the effort consumed in the present production. The basic function of the present invention is to provide a production method, which is a novel sustainable and repeatable method, to the related technical field.

[0034] The present invention essentially advances in a stoichiometric manner as shown in Equation 1, and metal borates are obtained as the final product.

M(NO.sub.3)+Na.sub.2B.sub.4O.sub.7. 10H.sub.2O=M.B.sub.2O.sub.3.nH.sub.2O+NaNO.sub.3+nH.sub.2O

Metal Nitrate+Borax.fwdarw.Metal Borate+Sodium Nitrate Water   Equation 1. Obtaining metal borate

[0035] In the production method of metal borates by means of precipitation, nitrates and/or perchlorates, which are easily dissolvable, preferably nitrates and/or perchlorates which are dissolved at room temperature, are used as the metal source. Said metal sources can be perchlorates, nitrate and/or completely dissolving salts having +2 and +1 charged ions. Nitrate and/or perchlorates, comprising silver, nickel, zinc and copper metals, is/are preferably used.

[0036] The method of production of metal borates by means of precipitation is a method which needs pH control of the medium. Said medium pH must be 7 and in intervals which are close to 7. In media where the pH value is basic, it is more probable that metal oxide structures are formed instead of metal borate.

[0037] In the method of production of metal borates by means of precipitation, the molarity value of the metal source solutions used as the beginning substance is important. By means of the precipitation to be used in the present invention, the most important inputs for the production of nano-structured metal borates are pH and temperature of the medium and the molarity of the beginning components. In a preferred application, the molarity proportion of the input, including metal, to the input, including boron, is between 1.5 and 2. When the molarity of the preferred structure comprising metal is 2 times of the molarity of the boron including structure, good results are obtained.

[0038] The subject matter relates to production of metal borates by means of the precipitation method, the production method of nano-structuredmetal borates is characterized by the application of the following processes: [0039] Adding specific amount of borax compound into the metal including solutions and mixing the mixture at obtained specific speeds, [0040] Obtaining precipitate after the mixing process, [0041] Applying washing, filtration and drying processes to the precipitate, [0042] Applying sintering process.

[0043] Obtaining metal borates by means of the precipitation method to be used in the present invention takes place after realization of the reactions between the borax compound and the solution, comprising metal, in stoichiometric proportion as also known beforehand. For the stoichiometric proportion preferred in the invention, the metal including solution/borax mole proportion changes between 0.5 or 1 or 1.5 and finally 2. In the preferred application, the metal including solution/borax mole proportion is 2:1.

[0044] It has not been detected that there is a very big alkali medium in the obtained solutions during the reaction. However, borax is related to the characteristics of the tetra-borate root structure which forms boric acid naturally and which makes the medium basic. Adding this chemical root in additional amount increases pH value relatively, however a very big basic medium is not observed. In the reaction, the temperature is at substantially acceptable points.

[0045] The solution comprising metal is perchlorate and nitrate solutions preferably comprising Zn, Cu and Ag metals.

[0046] Except the solution which comprises metal, a second solvent or additive material is not added to the medium.

[0047] The mixing process mentioned in the present invention is realized with speed of at least 100 rpm. The reaction is realized such that the duration thereof is at least 2 hours. The reaction temperature is between 40° C. and 90° C. And it is applied at fixed temperature.

[0048] The obtained precipitation is washed at least 3 times. And the precipitation is preferably dried between 75° C. and 90° C.

[0049] In order for the precipitate to gain the required chemical ingredient, the precipitate is subjected to sintering process between 400° C. and 1500° C. The sintering process is realized at fixed temperature between 2 hours and 24 hours.

[0050] The innovative characteristic in the present invention is that in order to provide formation of nano-structured metal borates, a method is applied with substantially easy reaction conditions and with relatively simpler reaction conditions. The total reaction is cheaper both in terms of heat and cost and has characteristics which can be produced in industrial base. Particularly during the reaction, the conditions and the calcination temperature have been improved in a more suitable manner consuming less energy. The production method presented to the related technical field is considered to present additional advantages.

[0051] In the invention, XRD analysis of silver borate, zinc borate and copper borates obtained by means of realization of the reaction between borax and perchlorate or nitrate solution, including a metal, in a stoichiometric proportion as shown in Equation 1 is given in FIGS. 1A-1C. Accordingly, when the fingerprints of the obtained final products are examined, it is seen that silver borate, copper borate and zinc borate structures are observed.

[0052] In FIGS. 2A-2C, SEM images of silver borate, zinc borate and copper borates obtained by means of realization of the reaction between borax and perchlorate or nitrate solution, including a metal, in a stoichiometric proportion as shown in Equation 1 are given. Thanks to said SEM images, the surface images of the obtained final products are determined.

[0053] In FIGS. 3A-3C, EDX images of silver borate, copper borate and zinc borates obtained by means of realization of the reaction between borax and perchlorate or nitrate solution, including a metal, in a stoichiometric proportion as shown in Equation 1 are given. The chemical components of the final products obtained by means of this are examined.

[0054] It is considered that the obtained metal borates can be used in various fields, they are recommended to be used for the surfaces desired to be antibacterial and health tools, and for ceramic, tile, glazed tile and vitrified products. Besides, said metal borates can be used in various materials which have fireproof characteristic.