KR19990068472A - Silver-containing activated carbon fiber - Google Patents

Abstract

(1) The technical field to which the invention belongs

Preparation of Adsorption Functional New Materials for Effective Removal of Gas and Liquid Contaminants

(2) Purpose of the invention

① Development of fibrous adsorbent with excellent adsorption capacity

② Add silver to adsorbent

평균 Used as a catalyst carrier by enlarging the average diameter of micropores

항균 Used as antibacterial functional adsorbent by silver

(3) Composition of invention

It consists of modifying the raw material pitch, mixing the modified pitch and silver (Ag) particles, melt spinning the mixed pitch, oxidizing the spinning fiber, and activating process.

A certain concentration of silver oxide is added to a pitch having a constant molecular weight distribution and a high softening point, and mixed to obtain good melt spinning. The melt-spun pitch fibers are infused through an oxidation process and carbonized through a carbonization process. The silver-containing carbon fiber is activated with a mixture of hot nitrogen and steam to produce a porous fibrous adsorbent. Since the adsorption capacity has a large specific surface area and micropores should be exposed on the surface, various grades of silver-containing activated carbon fibers can be produced by controlling the mixing ratio of temperature, time and steam at the time of activation.

(4) effects of the invention

By including silver particles, it can give antimicrobial function to microorganisms, and by expanding the size of micropores to medium-pore scale, it is possible to effectively separate substances with high molecular weight, thus showing an excellent effect on adsorption and removal of environmental pollutants.

Description

Silver-containing activated carbon fiber

Fibrous activated carbon (active carbon fiber), which has been developed and attracted much attention recently, is an extremely thin fiber (average diameter of 10 µm) activated at high temperature, and numerous micropores have been developed on the surface and inside thereof, so that the specific surface area of the activated carbon fiber Adsorption rate is more than 100 times faster because it is more than 2 times and diffusion resistance to mass transfer is negligible. Therefore, fibrous activated carbon has excellent performance in adsorption and removal of contaminants in gaseous or liquid phase, and has excellent regeneration and easy handling, so it is widely used in separation of mixed gas, removal of odor, purification of water and air, recovery of solvent, etc. It is expected to gradually replace powdered or granular activated carbon.

The present invention is the addition of an appropriate amount of silver to the pitch, followed by oxidation, carbonization, steam activation, and the invention of a fibrous adsorbent (activated carbon fiber) having a large surface area and excellent adsorptive power. The present invention relates to a method for preparing an antimicrobial functional fibrous adsorbent, which can be used as a carrier of a catalyst by expanding from about 8-10 kPa to about 20 kPa of the existing fibrous activated carbon not added.

Figure 1 shows carbon fibers without adding silver (CF-S0), carbon fibers with 1, OOppm (CF-S1) and 10,000 ppm (CF-S2) added to silver, and fibrous activated carbon (ACF-S0) Scanning electron micrographs of ACF-S1, ACF-S2)

Figure 2 is a transmission electron micrograph of silver-dispersed fibrous activated carbon

Figure 3 shows the fine pore distribution of silver dispersed fibrous activated carbon

Table 1 shows the characteristics, adsorption capacity and antimicrobial activity of silver-containing fibrous activated carbons (ACF-S1) prepared under different activation conditions.

The present invention is a petroleum refining method as in the method of manufacturing the isotropic pitch-based activated carbon fiber issued by the inventor (Korean Patent No. 046604, registered date 1991. 12 3. 1991, Korean Patent No. 138961, registered date 1998.2.24.) The residue pitch is modified to form a radioactive precursor, and an appropriate amount of silver compound is directly mixed therein, followed by melt spinning at about 300 ° C., air oxidation and carbonization at 1000 ° C. FIG. In this carbonization process, the silver compound is decomposed so that only silver metal is present in the carbon fiber. Properly activating this carbon fiber with a mixture of water vapor and nitrogen yields a silver-containing activated carbon fiber whose average micropore size is more than twice that of the existing activated carbon fiber.

That is, NCB (Naphtha Cracking Bottom) oil is placed in a reforming reactor and modified while being heated to about 400 ° C. to obtain an isotropic precursor (precursor) pitch. To this, a silver compound is added so that the concentration of silver is 100-100 ppm and mixed thoroughly. The mixture is spun at 290 ° C.-350 ° C. to obtain pitch fibers. This pitch fiber is infusified by oxidizing with oxygen in the air, and carbonized at 100 占 폚 to obtain carbon fiber. This carbon fiber is activated at 850 ° C.-950 ° C. with a mixed gas of nitrogen and steam to produce silver-containing activated carbon fiber.

The present invention aims at economic production in addition to the two purposes of antimicrobial activity and expansion of micropores, and differs from raw materials and production methods in the method performed in Japan. In other words, it is intended to manufacture the pitch-based carbon fibers made by refining the pitch, which is a refining residue of crude oil, and then directly mixing silver compounds with melt and spinning.

Silver particles can provide antimicrobial function to microorganisms, and the size of micropores can be expanded to medium pore size (> 20Å) to effectively separate substances with large molecular weight. Will show.

Claims (1)

A process for producing a pitch-based activated carbon fiber containing silver. That is, the silver compound is added to the radioactive pitch at an appropriate concentration (1, OOO-1O, OOOppm) and then mixed well, and directly melt-spun to obtain pitch fibers, which are activated by air oxidation, nitrogen atmosphere carbonization, and steam. Finally, the average micropore diameter is about 30 mm 3, the specific surface area is 1500-2,200 m ² / g, the total pore volume is 0.5cc / g or more, and the antimicrobial activity is maintained even if it is deposited for 20 days in tap water flowing at a flow rate of 5 l / min. Visible high adsorption capacity fibrous adsorbent manufacturing method.