KR100405375B1 - Manufactural method of activated carbon as a bactericidal photo-catalyst - Google Patents

Abstract

The present invention relates to a method for preparing photocatalytic activated carbon used for the sterilization of air and water. Specifically, titanium isopropoxide (Ti (OCH (CH ₃ ) ₂ ) ₄ ) was mixed into 1.5 l of ethanol having a purity of 99% or higher by using 1.66 ml, 8.28 ml, and 16.65 ml, respectively, using a 30 rpm agitator. After stirring for 48 hours, add 2-3 drops of concentrated nitric acid to make TiO ₂ sol of 0.006, 0.0314, and 0.314M, respectively, take 20ml of each, wash it clean with 1L of distilled water, and dry the dried carbon at 105 ℃ for 2 hours. Mixed with water and dried at 100-200 ° C. for 1-2 hours and heated to 801-1000 ° C. in the absence of oxygen for 20-60 minutes, and 4 ml of 0.0314 M TiO ₂ sol and 0.05 M ZnO sol 26 ㎖, 15 ml of 0.0314M TiO ₂ sol, 15 ml of 0.05M ZnO sol, 26 ml of 0.0314M TiO ₂ sol and 4 ml of 0.05M ZnO sol were mixed to make 30 ml, and mixed with 30 g of activated carbon. Drying for 1-2 hours at 0 ° C., and heating to 801-1000 ° C. in the absence of oxygen for 20-60 minutes, 156.2 mg, 15.65 g, and 156.5 g of zinc nitrate (Zn (NO ₃ ) ₂ 6H ₂ O), respectively, were added to 1.0 L of ethanol having a purity of 99% or higher, and concentrated nitric acid was stirred at 30 rpm for 12 hours using a stirrer at room temperature. Stir for 48 hours while adding 2 ~ 3 drops to prepare ZnO sol of 0.0005, 0.05 and 0.5M, respectively, take 20ml of them, wash them clean with 1L of distilled water, and mix with 30g of activated carbon dried at 105 ℃ for 2 hours, and then 100-200 It is dried for 1-2 hours at ℃ and heated to 801-1000 ℃ in the absence of oxygen for 20-60 minutes, using inorganic TiO ₂ in powder form or by direct coating on metal body, mesh body or glass surface. Although it is used as an organic substance removal or deodorant agent, the photocatalyst sol is impregnated to activated carbon alone, or the photocatalyst powder or photocatalyst sol is added to glucose, zeolite, activated carbon, sawdust, rice hull, waste tire, zeolite , It may be mixed in a certain ratio to the material to prepare a photocatalyst activated carbon to remove the air and sterilizing the microorganisms in water treatment and when I decomposed volatiles at the same time (VOC).

Description

Manufacturing method of photocatalytic activated carbon for sterilization {Manufactural method of activated carbon as a bactericidal photo-catalyst}

The present invention relates to a method for preparing photocatalytic activated carbon used for microbial sterilization of air and water. Specifically, titanium isopropoxide (Ti (OCH (CH ₃ )) in 1.5 l of ethanol having a purity of 99% or more. ₂ ) ₄ ) were mixed with 1.66ml, 8.28ml, and 16.65ml, respectively, to make 0.006, 0.0314, 0.314M of TiO ₂ sol, respectively, 20ml of which was washed thoroughly with 1L of distilled water and washed for 2 hours at 105 ° C. It is mixed with 30 g of dried activated carbon and dried for 1 to 2 hours at 100 to 200 ° C. and heated to 801 to 1000 ° C. in the absence of oxygen for 20 to 60 minutes. Zinc nitrate (Zn (NO ₃ ) ₂₆ H ₂ O ) 156.2mg, 15.65g, 156.5g respectively into 1.0ℓ ethanol of more than 99% purity and stirred for 12 hours at 30rpm using a stirrer at room temperature while stirring for 48 hours while adding 2-3 drops of concentrated nitric acid to 0.0005, Prepare 0.05, 0.5 M ZnO sol, taking 20 ml The mixture was washed with distilled water 1 L, mixed with 30 g of activated carbon dried at 105 ° C. for 2 hours, dried at 100 ° C. for 1 to 2 hours, and heated to 801 to 1000 ° C. for 20 to 60 minutes in the absence of oxygen. and a TiO ₂ sol 4㎖ of 0.0314M and ZnO 0.05M sol 26㎖, the TiO ₂ sol 15㎖ of 0.0314M and ZnO 0.05M sol 15㎖, 0.0314M of TiO ₂ sol 26㎖ and 0.05M of ZnO sol 4mL each of them to make 30mL mixed with activated carbon 30g, dried for 1 to 2 hours at 100 ~ 200 ℃ and heated to 801 ~ 1000 ℃ in the absence of oxygen for 20 to 60 minutes, characterized in that Chlorine, which is added to sterilize microorganisms in water, is suitable for the sterilization of Escherichia coli, but it has been pointed out as a big problem by generating trihalomethane, a carcinogen by reacting with organic matter in water. In addition, ozone treatment has a problem of expensive and rapid disinfection effect and formation of by-products harmful to humans. Silver (Ag) activated carbon, which is currently used, is used as a disinfectant by adding silver (Ag) to activated carbon. The present invention has the disadvantage of continuously eluting silver (Ag) ions and having a high price. The present invention is to prepare photocatalytic activated carbon having bactericidal properties upon receiving light energy without being harmful to humans. When photocatalyst titanium dioxide receives solar energy or ultraviolet rays, electrons move from the valence band filled with their own electrons to the conduction band where the electrons are empty. The excited catalyst forms hydrogen radicals, a powerful oxidizing agent, to sterilize microorganisms in water. The method of sterilizing Escherichia coli involves the transfer of electrons and electron-hole pairs when ZnO and TiO ₂ receive energy above the bandgap. It reacts with water and O ₂ to produce H ₂ O ₂ , OH, etc., and there is a strong sterilization effect by these. When microorganisms are sterilized by the generated H ₂ O ₂ , OH, etc. When converted into CO ₂ or H ₂ O and used outside of the semiconductor surface and receiving light energy again, it functions as a photocatalyst. Sterilization by TiO ₂ and ZnO powders is difficult to remove these powders after sterilization, making TiO ₂ and ZnO powders and sol, mixed with activated carbon, drying for 1-2 hours at 100-200 ℃ and free of oxygen for 20-60 minutes. Photocatalytic activated carbon was prepared by heating to 801-1000 ° C. in the state. Conventional activated carbon, which is widely used in water purification treatment, mainly treats coconut shell, sawdust and lignite with zinc chloride or phosphoric acid to produce porous activated carbon by spraying water vapor during dry distillation or high temperature treatment to remove adsorption of volatile organic substances. However, when the adsorption of volatile substances is completed, the breakthrough time at which the eluted or adsorbed substance is discharged quickly appears, and the sterilizing power is also decreased. In addition, the conventional technique uses inorganic TiO ₂ in powder form, metal or mesh body, The coating is applied directly to the glass surface and used as an organic material removal or deodorant by the photocatalyst, but the industrial use is limited due to the disadvantage that the coating material has a low affinity and is easily detached. In addition, when coating the catalyst, the deodorizing agent or antibacterial catalyst was prepared by mixing the curing agent, but when the curing agent is used, it is dissolved in water, which brings limitations to industrial use.

Therefore, in the present invention, in order to solve the above-mentioned problems, a fixed ratio of the photocatalyst sol is added to activated carbon alone, or the photocatalyst powder or photocatalyst sol is added to glucose, activated carbon, rice hull, waste tire, zeolite, etc. The present invention relates to a method for preparing photocatalytic activated carbon which sterilizes microorganisms in air and water treatment and simultaneously removes volatile volatile substances (VOC).

Figure 1. Photocatalytic Activated Carbon Impregnated with Titanium Dioxide Sol (T-1)

Figure 2. Photocatalytic activated carbon impregnated with zinc nitrate (Z-1)

3. Sawdust impregnated molding sawdust activated carbon (saw activated carbon-4-1120)

4. Impregnated molding sawdust activated carbon (saw performance bow-8-1120)

5. Impregnated molding sawdust activated carbon (A-0111)

6. Impregnated sawdust activated carbon impregnated with titanium dioxide sol (B-0111)

Figure 7. Impregnated activated carbon impregnated with titanium dioxide sol (C-0111)

8. Impregnated sawdust activated carbon impregnated with titanium dioxide sol (F-0111)

In order to achieve the above object, TiO ₂ sol, a photocatalyst, is mixed with 1.5 l of ethanol having a purity of 99% or more and 1.66 ml of titanium isopropoxide (Ti (OCH (CH ₃ ) ₂ ) ₄ ), using a stirrer of 30 rpm. Stir with 48 drops of concentrated nitric acid, add 2-3 drops of concentrated nitric acid, make 0.006M of TiO ₂ sol, take 20 ml of it, wash it clean with 1 liter of distilled water, and mix it with 30 g of activated carbon dried at 105 ° C for 2 hours, then add 100 ~ 200 Photocatalytic activated carbon of T-1 was prepared by drying at 1-2 DEG C for 1 to 2 hours and heating at 801 to 1000 DEG C for 20 to 60 minutes in the absence of oxygen. Titanium isopropoxide (1.5 L in ethanol having a purity of 99% or more) 8.28 ml of Ti (OCH (CH ₃ ) ₂ ) ₄ ) was mixed and stirred while adding 48 drops of concentrated nitric acid using a 30rpm stirrer for 48 hours to make 0.0314M of TiO ₂ sol. Wash thoroughly with 1 liter of distilled water and clean at 2 T-2 photocatalytic activated carbon was prepared by mixing with 30 g of dried activated carbon and drying it at 100-200 ° C. for 1 to 2 hours and heating it at 801-1000 ° C. for 20 to 60 minutes in the absence of oxygen. 16.65 ml of titanium isopropoxide (Ti (OCH (CH ₃ ) ₂ ) ₄ ) was mixed with 1.5 l of ethanol, and stirred for 48 hours using a 30 rpm stirrer, followed by stirring with 2-3 drops of concentrated nitric acid. ₂ sols are taken, 20 ml of which are washed thoroughly with 1 L of distilled water, mixed with 30 g of activated carbon dried at 105 ° C. for 2 hours, dried at 100-200 ° C. for 1 to 2 hours, and 801 without oxygen for 20 to 60 minutes. The photocatalytic activated carbon of T-3 was prepared by heating to ˜1000 ° C. ZnO sol was mixed with 156.2 mg of zinc nitrate (Zn (NO ₃ ) ₂ ) in 1 liter of ethanol having a purity of 99% or higher, using a stirrer. Stir 12 hours and add 2 ~ 3 drops of concentrated nitric acid for 48 hours. On the other hand, make 0.0005M ZnO sol, take 20ml of it, wash it clean with 1ℓ of distilled water, mix it with 30g of activated carbon dried at 105 ℃ for 2 hours, and dry it at 100 ~ 200 ℃ for 1 ~ 2 hours, and have no oxygen for 20 ~ 60 minutes. Z-1 photocatalytic activated carbon was prepared by heating to 801 to 1000 ° C. ZnO sol was mixed with 15.65 g of zinc nitrate (Zn (NO ₃ ) ₂ ) in 1 L of ethanol having a purity of 99% or higher as a solvent. Stirred at 30 rpm for 12 hours, and stirred for 48 hours while adding 2-3 drops of concentrated nitric acid to make ZnO sol of 0.05 M, 20 ml of which was washed thoroughly with 1 L of distilled water and mixed with 30 g of activated carbon dried at 105 ° C. for 2 hours. Z-2 photocatalytic activated carbon was prepared by drying at 100-200 ° C. for 1 to 2 hours and heating at 801-1000 ° C. for 20 to 60 minutes in the absence of oxygen. ZnO sol is a ethanol having a purity of 99% or more as a solvent. 1ℓ of zinc nitrate in the (Zn (NO _{3) 2)} to 156.5g The mixture was stirred for 12 hours at 30 rpm using a stirrer and stirred for 48 hours while adding 2-3 drops of concentrated nitric acid to make 0.5 M ZnO sol, 20 ml of which was washed with 1 L of distilled water and dried at 105 ° C. for 2 hours. by mixing the 30g and 100 and was dried for 1 ~ 2 hours at 200 ℃ to prepare a photocatalyst activated carbon of Z-3 by heating in the absence of oxygen in 20-60 minutes 801 ~ 1000 ℃ .0.0314M of TiO ₂ sol 4㎖ 0.05 M ZnO sol was mixed with 30 ml of 30 ml of activated carbon and dried in 30 g of activated carbon for 1 to 2 hours at 100 to 200 ° C. and heated to 801 to 1000 ° C. for 20 to 60 minutes in the absence of oxygen for TZ-1. A photocatalytic activated carbon was prepared. 15 ml of 0.314M TiO ₂ sol and 15 ml of 0.05M ZnO sol were mixed to 30 ml, mixed with 30 g of activated carbon, dried at 100 to 200 ° C. for 1 to 2 hours, and oxygenated for 20 to 60 minutes. It heated to 801-1000 degreeC in the absence, and prepared the photocatalytic activated carbon of TZ-2. 0.03 Mix 26 ml of 14M TiO ₂ sol and 4 ml of 0.05M ZnO sol to make 30 ml, mix with 30 g of activated carbon, dry for 1 ~ 2 hours at 100 ~ 200 ℃ and 801 ~ 1000 ℃ with no oxygen for 20 ~ 60 minutes. Heated to prepare a photocatalytic activated carbon of TZ-3.

The composition and impregnation rate of the photocatalytic activated carbon were measured by ICP (Inductively coupled plasma atomic emission spectrophotometer), and the specific surface area was measured by using an automatic adsorption device. Microbial sterilization effect of the photocatalytic activated carbon was dissolved 1ml E. coli strain stored in frozen and put it in 9ml B medium and incubated for 16 hours at 37 ℃. This was diluted 100-fold, where 0.5 ml was taken and inoculated into 50 ml of reaction solution. 1.5 g of photocatalytic activated carbon was added to the reaction solution contained in the reaction vessel and allowed to react for 0, 10, 20, 30, 40, 50 and 60 minutes. The reaction experiment temperature was maintained at 25 ° C. and the stirring speed was 130 rpm. In order to see the photochemical reaction effect of TiO ₂ by ultraviolet rays, 300 W and 400 W UV of 20 W and 40 W were irradiated for up to 60 minutes on 10 cm of the reaction vessel. . For viable cell count, the sample was diluted appropriately, incubated in desoxycholate medium at 36 ° C for 2 days, and the colony count was counted. The number of viable cells of the experimental samples containing only E. coli was almost constant when observed for up to 60 minutes without killing, slightly decreased with UV treatment, and decreased with time when activated carbon was treated. It is believed that the adsorption on activated carbon surface over time. The survival percentage after 60 minutes was 90% for control, 74.6% for UV treatment, 50% for AC treatment and 40% for UV + AC treatment. It could be seen that the survival rate decreases with time when a E.coℓi experiments using three different concentrations of _{TiO 2 .TiO 2, ZnO, TiO} 2 + ZnO in the sterilization experiment using the light intensity and the UV is an important variable. In this experiment, Z-2 and TZ-2 were found to decrease the percentage of survival as the brightness increased. In the case of Z-2, the survival rate is 17.10% when there is no light after 60 minutes, 3.20% when exposed to 20W of light, and 1.60% when exposed to 40W of light. Survival after 60 minutes with TiO ₂ + ZnO was 13.60% in the absence of light, 7.50% in 20W light, and 2.80% in 40W light. In the case of the T-2, the survival rate after 60 minutes is 29.30% in the absence of light, 3.0% in 20W, 4.0% in 40W, and the difference between light and non-light is clear. The difference is almost invisible.

Table 1. Adsorption capacity of impregnated activated carbon

Table 2. Removal of Microorganisms by Type of Activated Carbon

The photomicrographs of the electron microscope (SEM) of the activated carbon impregnated with various photocatalysts show that the fine pores are well developed. Impregnated activated carbon

Example 1

Titanium isopropoxide (Ti (OCH (CH ₃ ) ₂ ) ₄ ), a photocatalyst, was taken in 1.66 ml, 8.28 ml, and 16.65 ml, respectively, and placed in 1.5 l of ethanol solvent of 99% purity or higher using a 30 rpm agitator. Stir with 48 drops of concentrated nitric acid, add 2-3 drops of concentrated nitric acid, prepare 0.006, 0.0314, and 0.314 M TiO ₂ sol, respectively, take 20 ml of the solution, clean it with 1 L of distilled water, and dry the dried carbon at 105 ° C for 2 hours. After mixing for 1 hour to 2 hours at 100-200 ℃ and heated to 801-1000 ℃ in the absence of oxygen for 20-60 minutes to prepare photocatalytic activated carbon of T-1, T-2, T-3, respectively. The pH of the photocatalytic activated carbon (T-1) washed with water was 9.27, and the concentration of titanium dioxide was 1mg of titanium dioxide (1mg / g) per 1g of activated carbon, the percentage of fixed carbon was 92.33%, and the specific surface area was 733㎡ photocatalytic activated carbon (T-2) was washed with distilled water. The hydrogen ion concentration (pH) was 9.41 and the concentration of titanium dioxide was 5 mg of titanium dioxide (5 mg / g) per 1 g of activated carbon, the fixed carbon percentage was 89.50%, and the specific surface area was 733 m 2 / g. The hydrogen ion concentration (pH) of the photocatalytic activated carbon obtained by washing (T-3) with distilled water was 9.27, and the concentration of titanium dioxide was 50 mg of titanium dioxide (50 mg / g) per 1 g of activated carbon, and the fixed carbon percentage was 90.96% and specific surface area was 746m2 / g. At concentrations of T-1 and T-2 at concentrations of 0.006M and 0.0314M, respectively, the survival rate after 60 minutes was less than 5% of the initial stage, and as the concentration increased, Mortality tended to be lower. At three concentrations, t _1/2 , the time at which 50% of the initial inoculation bacteria were killed, was 24.6, 18.6, and 36.8 minutes, respectively, with the lowest killing time by T-2. The percentage of survival after 60 minutes was T-1 (0.006M) was 4.9%, T-2 (0.0314M) was 4%, and T-3 (0.314M) was 18.5%, showing the highest sterilization ability by T-2 (0.0314M). Adsorption efficiency for trichloroethylene (TCE) removal was determined by Freundlich's isothermal adsorption capacity per unit mass of activated carbon. K of coconut shell activated carbon is 0.17, 1 / n is 1.47, but k and 1 / n of T-1 are 0.89 and 1.03, respectively, k and 1 / n of T-2 are 0.13 and 1.68, respectively. 1 / n was 1.6 and 1.28, respectively.

Example 2

156.2 mg, 15.65 g, and 156.5 g of zinc nitrate (Zn (NO ₃ ) ₂ 6H ₂ O), respectively, were added to 1.0 L of ethanol having a purity of 99% or higher, and concentrated nitric acid was stirred at 30 rpm for 12 hours using a stirrer at room temperature. Stir for 48 hours while adding 2 ~ 3 drops to prepare ZnO sol of 0.0005, 0.05 and 0.5M, respectively, take 20ml of them, wash them clean with 1L of distilled water, mix with 30g of activated carbon dried at 105 ℃ for 2 hours, and then 100 ~ 200 ℃. Z-1, Z-2, and Z-3 photocatalytic activated carbon were prepared by drying at 1-2 hours and heating at 801 to 1000 ° C. for 20 to 60 minutes in the absence of oxygen. Z-1 photocatalysts washed with distilled water The hydrogen ion concentration (pH) of activated carbon was 9.37, the zinc oxide concentration was 0.15 mg zinc oxide per gram of activated carbon, the fixed carbon percentage was 92.08%, and the specific surface area was 681㎡ / g. Z-2 photocatalytic activated carbon washed with distilled water Has a pH of 9.36 and a zinc oxide concentration of 15 per g of activated carbon. The percentage of titanium dioxide was hydronium fixed carbon is 91.35%, the specific surface area was 567㎡ / g. The hydrogen ion concentration (pH) of Z-3 photocatalytic activated carbon washed with distilled water was 9.36. The zinc oxide concentration was 150 mg of titanium dioxide per 1 g of activated carbon, the fixed carbon percentage was 99.45%, and the specific surface area was 643㎡ / g. When the E. coli experiments were performed using three concentrations of ZnO, the survival rate decreased with time. Survival after 60 minutes at Z-1 (0.005M) and Z-2 (0.05M) was 6% and 1%, respectively, and decreased proportionally with time, but decreased to 10 minutes at Z-3 (0.5M). After 10 minutes, a steady state was observed. The half-life t _1/2 , the time at which 50% of the initial inoculated cells were killed, was 23.7, 15.4, and 26.6 minutes at Z-1, 2, and 3, respectively, showing the shortest sterilization time with Z-2. Silver Z-1 was 6%, Z-2 was 1.6%, and Z-3 was 41.8%. Adsorption treatment efficiency for trichlorethylene (TCE) removal was determined by Freundlich's isothermal adsorption capacity per unit mass of activated carbon. K and 1 / n of Z-1 were 0.008 and 2.7, k and 1 / n of Z-2 were 1.21 and 1.26, respectively, and k and 1 / n of Z-3 were 7.82 and 0.69, respectively.

Example 3

4 ml of 0.0314M TiO ₂ sol and 26 ml of 0.05M ZnO sol are mixed to make 30 ml, mixed with 30 g of activated carbon, dried for 1-2 hours at 100-200 ° C and 801 without oxygen for 20-60 minutes. The hydrogen ion concentration (pH) of the photocatalytic activated carbon (TZ-1) heated to −1000 ° C. was 9.30, the percentage of fixed carbon was 91.56%, and the specific surface area was 1137 m 2 / g.

Mix 15 ml of 0.0314M TiO ₂ sol and 15ml of 0.05M ZnO sol to make 30ml, mix with 30g of activated carbon, dry for 1-2 hours at 100-200 ℃ and 801 without oxygen for 20-60 minutes The hydrogen ion concentration (pH) of the photocatalytic activated carbon (TZ-2) heated to −1000 ° C. was 9.57, the percentage of fixed carbon was 91.89%, and the specific surface area was 1124 m 2 / g.

Mix 26 ml of 0.0314 M TiO ₂ sol and 4 ml of 0.05 M ZnO sol to make 30 ml, mix with 30 g of activated carbon, dry for 1-2 hours at 100-200 ° C and 801 without oxygen for 20-60 minutes. The hydrogen ion concentration (pH) of the photocatalytic activated carbon (TZ-3) heated to −1000 ° C. was 9.35, the percentage of fixed carbon was 93.25%, and the specific surface area was 1137 m 2 / g.

In the E. coli experiments using TZ-1, TZ-2, and TZ-3, the survival rate decreased with time. In TZ-1, TZ-2, and TZ-3, the half-life t _1/2 , the time at which 50% of the initial inoculated bacteria were killed, was 13.3, 17.28, and 21.9 minutes, respectively, with the shortest sterilization time by TZ-1.

Survival percentage after 60 minutes was 0.6%, 0.5%, and 2.8% in TZ-1, TZ-2 and TZ-3, respectively, indicating almost the same effect in TZ-1 and TZ-2. In the E. coli sterilization experiment with activated carbon treated with TiO ₂ , ZnO and TiO ₂ + ZnO, the number of E. coli cells decreased with time.

Adsorption treatment efficiency for trichlorethylene (TCE) removal was determined by Freundlich's isothermal adsorption capacity per unit mass of activated carbon. K and 1 / n of TZ-1 were 0.006 and 1.97, k and 1 / n of TZ-2 were 0.48 and 1.32, respectively, and k and 1 / n of TZ-3 were 0.07 and 1.52, respectively.

In the present invention, as shown in the sterilization ability of microorganisms, silver activated carbon used at high cost for water purification treatment because the control group has better sterilization ability of bacteria and microorganisms and adsorption removal ability of trihalomethane than palm peel activated carbon or sawdust activated carbon. It can be used as a substitute for and can prevent the growth of microorganisms caused by activated carbon. It also has the effect of preventing the generation of methane to be a tree is reduced carcinogen amount of chlorine to be added in order to kill microorganisms when using a photocatalyst activated carbon Further conventional techniques with an inorganic phosphorus TiO ₂ powder form It can be used to remove organic substances by the photocatalyst or to deodorize it by coating it directly on metal, mesh or glass surface. However, the photocatalyst sol is added to activated carbon alone, or the photocatalyst powder or photocatalyst sol is added to glucose, zeolite, Activated carbon, sawdust, rice hulls, waste tires, zeolites, and materials can be mixed in a proportion to produce photocatalytic activated carbon to sterilize microorganisms in air and water treatment and simultaneously remove VOCs.

Claims (10)

Titanium isopropoxide (Ti (OCH (CH ₃ ) ₂ ) ₄ ) was added to 1.66 ml, 8.28 ml, and 16.65 ml, respectively, in 1.5 l of ethanol having more than 99% purity and stirred for 48 hours using a 30 rpm stirrer. While stirring, add 2-3 drops of concentrated nitric acid to make TiO ₂ sol of 0.006, 0.0314, and 0.314M, respectively, take 20ml of each, clean it with 1L of distilled water, and mix with 30g of activated carbon dried at 105 ℃ for 2 hours. Method of producing a photocatalyst activated carbon, characterized in that the drying for 1-2 hours at 200 ℃ and heated to 801-1000 ℃ in the absence of oxygen again 20-60 minutes. Of TiO ₂ sol 4㎖ of 0.0314M and ZnO 0.05M sol 26㎖, the TiO ₂ sol 15㎖ of 0.0314M and ZnO 0.05M sol 15㎖, the TiO ₂ sol 26㎖ of 0.0314M and ZnO 0.05M sol 4㎖ Each of them was mixed with 30ml of activated carbon 30g, dried for 1-2 hours at 100-200 ℃ and again heated to 801-1000 ℃ in the absence of oxygen for 20-60 minutes characterized in that the production of photocatalytic activated carbon Way. delete delete delete delete delete delete delete 156.2 mg, 15.65 g, and 156.5 g of zinc nitrate (Zn (NO ₃ ) ₂ 6H ₂ O), respectively, were added to 1.0 l of ethanol having a purity of 99% or higher. Stir for 48 hours while adding 2 ~ 3 drops to prepare ZnO sol of 0.0005, 0.05 and 0.5M, respectively, take 20ml of them, wash them clean with 1L of distilled water, and mix with 30g of activated carbon dried at 105 ℃ for 2 hours, and then 100-200 Method of producing a photocatalytic activated carbon for sterilization, characterized in that the drying for 1-2 hours at ℃ and heated to 801-1000 ℃ in the absence of oxygen for 20-60 minutes.