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TSTO Patents


CN102173477
Preparation technique of novel silver-carried activated carbon by hydrothermal method









Inventor(s):     FENGLI GUO, et al.

The invention relates to a preparation technique of novel silver-carried activated carbon by a hydrothermal method, belonging to the technical field of water treatment. The technique comprises the following steps: evenly mixing tetrasilver tetroxide and activated carbon in a mass ratio 1:(800-1200) by adding water, wherein 1-5 parts of water is added to every part of activated carbon; drying at 60-150 DEG C for 10-40 minutes, and adding potassium persulfate or sodium persulfate, sodium hydroxide or potassium hydroxide, and distilled water, wherein the addition amounts of the potassium persulfate or sodium persulfate, and the sodium hydroxide or potassium hydroxide are respectively 1-3 times of every part of tetrasilver tetroxide, and the addition amount of the distilled water is 1-5 times of every part of activated carbon; and finally, stirring to react at 50-80 DEG C for 1-2 hours, filtering, and flushing with pure water more than twice. The technique for producing trivalent-silver-attached activated carbon is simple, and has the advantages of high synthesis efficiency and low energy consumption; and silver ions can be uniformly distributed and firmly attached onto the activated carbon, and can not easily fall off. The silver-carried activated carbon has obvious actions on multiple microbes, and is safe for both environment and human.

DESCRIPTION
[0001]

Technology area:
[0002]

The present invention relates to a novel silver activated carbon Hydrothermal processes belonging to the technical field of water treatment.
[0003]

Background technique:
[0004]

Activated carbon fiber (ACF) not only contains a large number of pores, large specific surface area, and its surface also contains a lot of organic groups.

Thus, activated carbon fiber not only has a good adsorption of organic matter in the water ordinary performance activated carbon adsorption in use enrichment harmful substances and micro-organisms in the water, but a single activated carbon is easy to bacterial growth and reproduction, resulting in the increase in the number of bacteria in water filtration, and generates mutagenic substances nitrite, causing water quality deterioration exports.

Silver as a bactericide already known in the year 2000, according to the researchers to test the relative efficacy of different metals sterilization efficacy were measured, arranged as follows:
[0005]

Ag> Hg> Cu> Cd> Ni> Co> Zn> Fe> Ca
[0006]

Therefore, many researchers silver activated carbon adsorption play a bactericidal effect, Luo Yongyi (Environmental Chemistry, 1995,14 (1), 75-79) application of activated carbon adsorption of silver nitrate.

Silver activated carbon in metallic silver in the water constantly release small amounts of silver ions.

This silver ions can lead to bacterial poisoning, intestinal pathogenic microorganisms typhoid, paratyphoid and dysentery pathogens exhibit its particularly effective action, this efficacy may prevent contamination of activated carbon.

Silver activated carbon is used as drinking water purification sterilization, disinfection, prevention of activated carbon Nymphoides dye, etc. It is an excellent water purification materials.
[0007]

Silver element belonging to the transition state of the Cu cluster elements to form an ion with a variety of price and health forms.
Silver also has the role of bactericidal activity involved in different valence bond forms, and now researchers have generally agreed that by studying the price of silver and its related disinfection, disinfection of high priced higher than low-cost silver (J.AM.CHEM.SOC.2009, 131,16147-16155; Burns 2007,33,139-148; East China University of Technology (Natural Science), 2008,34 (1), 86), silver oxide in the performance of trivalent silver ions, silver Highest price element of manifestation, it is due to the strong bactericidal activity and non-toxic, so it is believed to be used in many fields.

U.S. Patents 5,223,149 and domestic patents were announced CN 101844066 A synthesis of two different methods trivalent silver ions compound process, trivalent silver ions resulting water-soluble compound is good, light stability, and stability bactericidal properties.

But the lack of will to unite and characteristics of the activated carbon adsorption.
[0008]

SUMMARY:
[0009]

The purpose of the present invention is to provide a novel silver activated carbon can be used as a Hydrothermal Process filler made of water purifier can be applied to a variety of places on the drinking water disinfection.
[0010]

The present invention solves the technical problem of the technology used in the program are: a new kind of silver activated carbon Hydrothermal process, as follows: The tetroxide four silver and activated carbon mass ratio of 1:800-12000 water mixture evenly, which 1-5 parts of water per activated carbon, and then dried at 60-150 ? state 10-40min, then add potassium persulfate or sodium persulfate, sodium or potassium hydroxide, and distilled water, potassium persulfate or sodium persulfate which , sodium hydroxide or potassium hydroxide are added to the content of each of the four four silver oxide 1-3 times its volume of distilled water was added to each of activated carbon with water 1-5 times, and finally the reaction was stirred at 50-80 ? 1 2 hours, filtered, and washed with pure water twice or more.
[0011]

The four four silver oxide, activated carbon, sodium persulfate or potassium persulfate, sodium or potassium hydroxide specific mass ratio: activated carbon per 0.8-12kg four plus four silver oxide 1g, sodium persulfate or potassium persulfate 1-3g , sodium or potassium hydroxide 1-3g.
[0012]

The silver contained in the activated carbon is a trivalent silver, molecular forms of silver oxide.
[0013]

Production of the present invention attached to the trivalent silver activated carbon process is simple, high synthesis efficiency, low energy consumption, uniform distribution of silver ions on activated carbon, attached to a fixed, not falling.

Its remarkable variety of microorganisms, the environment and human security.
[0014]

DETAILED DESCRIPTION:
[0015]

A new silver activated carbon prepared by hydrothermal processes, as follows: The tetroxide four silver and activated carbon mixture evenly 1:800-12000 mass ratio of water, which 1-5 parts per activated carbon with water, and then in the 60- dried state at 150 ? 10-40min, then add potassium persulfate or sodium persulfate, sodium or potassium hydroxide, and distilled water, potassium persulfate or sodium persulfate thereof, sodium hydroxide or potassium hydroxide are added to the content Each tetroxide four silver 1-3 times, the amount of which distilled water was added to each of activated carbon with water 1-5 times, and finally the reaction was stirred at 50-80 ? for 1-2 hours, filtered, and rinsed with pure water twice or more can.
[0016]

The four four silver oxide, activated carbon, sodium persulfate or potassium persulfate, sodium or potassium hydroxide specific mass ratio: activated carbon per 0.8-12kg four plus four silver oxide 1g, sodium persulfate or potassium persulfate 1-3g , sodium or potassium hydroxide 1-3g.
[0017]

The silver contained in the activated carbon is a trivalent silver, molecular forms of silver oxide.
[0018]

In order to better illustrate the present invention, the following cases and the experimental results with the implementation of the present invention will be described in detail.
[0019]

Example One:
[0020]

Weigh tetroxide four silver 1g, grinding uniform, mixed with 1.2kg activated carbon, water 1000mL, mixed evenly, 60 ? drying 40min, was added to 10L of distilled water and then potassium persulfate, and potassium hydroxide was added while stirring the 3g, 80 ? pumping The reaction was stirred for 60 minutes, filtered, and washed four times with pure water.
Determination of activated carbon tetroxide four silver and uniformity of content at different points in use EDS (EDS) method, the results shown in Table 1.
[0021]

Table 1.
Activated carbon silver oxide mass percentage share
[0023]

Example Two:
[0024]

Weigh tetroxide four silver 1g, 12kg charcoal mixed, add water 10L, mixed evenly, 110 ? drying 40min, added 50L of distilled water and then potassium persulfate, and potassium hydroxide was added while stirring the 3g, 80 ? pumping reaction was stirred 60 minutes , filtered, and washed four times with pure water.

To illustrate the strength of adsorption of silver oxide on activated carbon, synthetic silver oxide containing activated carbon put in running water rinse 12 hours, drying, on charcoal silver content measured at different points in the use of EDS (EDS) Act and uniformity of results in Table 2.
[0025]

Table 2.
After a large number of activated charcoal in water silver oxide mass percentage share
[0027]

Example Three:
[0028]

Weigh tetroxide four silver 2g, mixed with 1.6kg activated carbon, water was added 1.6L, mixed uniformly, 150 ? drying 10min, stirring was added a solution of potassium persulfate state and 4g of potassium hydroxide respective 16L of distilled water, the reaction 80 ? 20 ??, filtered, and washed four times with pure water.

To illustrate the strength of adsorption of silver oxide on activated carbon, synthetic silver oxide containing activated carbon placed in the ultrasonic cleaning apparatus in 53KHz, one hour ultrasonic washing, drying, use at different points on the EDS (EDX) Act Determination of activated carbon tetroxide four silver content and the uniformity of the results shown in Table 3.
[0029]

Table 3.
After sonication activated carbon silver oxide mass percentage share





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