Common Indicators of Activated Carbon | ACC Activated Carbon Expert

{"news_id":8762,"is_preview":0,"news_info":{"id":8762,"company_id":176,"user_id":411,"author":"","website_id":781,"pub_date":"2024-03-14 10:18:23","urla":"common-indicators-of-activated-carbon","description":"Introduction to common indicators of activated carbon and detection methods,","image_url":"https:\/\/oss.matchpages.cn\/matchpages\/common\/2024\/0314\/2288\/65f25d7313a4a\/Combinations-of-Activated-Carbon-with-Different-Treatment-Methods.webp","image_alt":"Combinations-of-Activated-Carbon-with-Different-Treatment-Methods.webp","title":"Common Indicators of Activated Carbon","content":"<h1 style=\"line-height: 1.6;\"><strong>Common Indicators of Activated Carbon<\/strong><\/h1>\n<h2 style=\"line-height: 1.6;\"><span style=\"color: #169179; font-size: 14pt;\"><strong>1. Iodine value:<\/strong> <\/span><\/h2>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">Iodine value (iodine number) is a performance parameter of activated carbon and an indicator of the degree of unsaturation in organic compounds;<\/span><\/p>\n<h2 style=\"line-height: 1.6;\"><strong><span style=\"color: #169179; font-size: 14pt;\">2. The iodine value of activated carbon is the adsorption value: <\/span><\/strong><\/h2>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">it refers to the number of grams of iodine that can be absorbed (added) in 100g of material;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\"><span style=\"color: #000000;\">1) <\/span>Mainly used for the determination of oils, fatty acids, waxes, polyesters and other substances; <\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\"><span style=\"color: #000000;\">2)<\/span> The greater the degree of unsaturation, the higher the iodine value; <\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\"><span style=\"color: #000000;\">3) <\/span>The iodine value of drying oil is greater than that of non-drying oil;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">4) It should be noted that if there are two or more alkenyl groups in the molecular structure of the oil, the iodine value will be authentic only when these alkenyl groups are in a non-conjugated state;<\/span><\/p>\n<h2 style=\"line-height: 1.6;\"><strong><span style=\"color: #169179; font-size: 14pt;\">3. Determination of the iodine value of activated carbon: <\/span><\/strong><\/h2>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">There are three commonly used methods:<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\"><span style=\"color: #000000;\">1)<\/span> The carbon tetrachloride solution of oil and fat is titrated with the ethanol solution of iodine and mercury dichloride;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\"><span style=\"color: #000000;\">2) <\/span>Titrate with iodine chloride in glacial acetic acid solution;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\"><span style=\"color: #000000;\">3) <\/span>Titration with glacial acetic acid solution containing pyridine, bromine and concentrated sulfuric acid:<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">a. The iodine value of emulsifiable butter is usually between 24 and 26; b. The iodine value of drying oil is above 130; c. The iodine value of semi-drying oil is between 100 and 130;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">d. The iodine value of non-drying oil is below 100; e. The iodine value of land animal fat is below 80; f. The iodine value of marine animal fat is above 100.<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"text-decoration: underline;\"><span style=\"color: #333333; text-decoration: underline;\">\u203b The iodine values of nut shells, bamboo charcoal, and coal are all in the hundreds. The iodine values of activated carbon raw materials range from 800, 850, 900, 950, 1000, 1100mg\/g, etc.<\/span><\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">1) Iodine value is a liquid phase adsorption index, which can generally tell the specific surface area of activated carbon and whether the micropores are developed;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">2) The key gas phase adsorption indicators are: CTC adsorption value, benzene adsorption value: good activated carbon CTC&gt;100%, benzene adsorption&gt;50%;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">3) Different adsorption capacities lead to different costs and prices. Activated carbon coconut shells with the same iodine value have a very good adsorption effect on small particles. Different materials of activated carbon are selected for different applications.<\/span><\/p>\n<p><span style=\"color: #000000; font-size: 14pt;\">4) Simple determination method of iodine value adsorption force:<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(1) <span style=\"color: #000000;\">Weigh the weight with your hands:<\/span> If you want to improve the adsorption performance of activated carbon, you can only create as many pore structures as possible on the activated carbon. The more pores, the looser the activated carbon and the lighter the relative density. Therefore, good activated carbon feels better. It will be lighter,<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">When packaged with the same weight, the volume of activated carbon with good performance will be much larger than that of inferior activated carbon;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(2)<span style=\"color: #000000;\"> Soak in water to see the bubbles:<\/span> Put a small handful of activated carbon into the water. Due to the infiltration of water, the water will gradually immerse into the pore structure of the activated carbon, forcing the air in the pores to be discharged, thus producing a series of extremely fine bubbles in the water. Pull out a fine bubble line and make a slight bubble sound at the same time. The more violent this phenomenon occurs and the longer it lasts, the better the adsorption of activated carbon;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">(3) <span style=\"color: #000000;\">Look at the decolorization ability:<\/span> Another manifestation of the adsorption capacity of activated carbon is the decolorization ability. Activated carbon has the magical ability to turn colored liquids into light colors or colorless. This is actually because activated carbon adsorbs pigment molecules in colored liquids. Because of this characteristic of activated carbon, it is widely used in the production process of turning brown sugar into white sugar in the sugar industry.<\/span><\/p>\n<p style=\"line-height: 1.6;\"><strong><span style=\"color: #2dc26b;\">\u203b Operation method:<\/span><\/strong><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">1) Take two transparent cups, put pure water into one cup, and then drop a drop of red ink (any pigment that is easy to observe but does not change the properties of the water can be used here, such as blue ink, printer color ink, but can't u<\/span><span style=\"color: #333333;\">se ink and carbon ink), stir evenly and pour half of the colored water into another cup to keep as a comparison sample;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">2) Put the activated carbon into the colored water, the amount should be half or more of the water, so the effect will be more obvious; 3) After leaving it for 10-20 minutes, compare it with the comparison water sample. Under the same conditions, the stronger the decolorization effect. It is said that the better the adsorption performance is.<\/span><\/p>\n<h2 style=\"line-height: 1.6;\"><span style=\"color: #333333; font-size: 14pt;\"><strong>4. Benzene adsorption value:<\/strong> <\/span><\/h2>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">Benzene is a small molecule. The benzene adsorption value is used to characterize the adsorption capacity of activated carbon for small molecule organic matter.<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">1) The greater the benzene adsorption value, the stronger the activated carbon's adsorption capacity for small-molecule organic matter; 2) Weigh the activated carbon, place it in a container filled with benzene vapor, take it out after 24 hours of adsorption, weigh it, and calculate the difference between the two weights. The difference is the benzene adsorption value.<\/span><\/p>\n<h2 style=\"line-height: 1.6;\"><strong><span style=\"color: #333333; font-size: 14pt;\"><span style=\"color: #000000;\">5. Moisture\/moisture content:<\/span> <\/span><\/strong><\/h2>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">The definition of moisture content of activated carbon refers to the percentage of moisture content lost in the mass of the original sample after a certain amount of activated carbon sample is dried, constant temperature, constant weight, and cooled.<\/span><\/p>\n<p style=\"line-height: 1.6;\"><img src=\"https:\/\/oss.matchpages.cn\/matchpages\/common\/2023\/1108\/7316\/654b3310b09a6\/activated-carbon-allcarbon.png\" alt=\"activated carbon products \" width=\"900\" data-resolution=\"1806*396\" \/><\/p>\n<p style=\"line-height: 1.6;\"><strong><span style=\"color: #2dc26b;\">\u203b Detection method:<\/span><\/strong><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">1) Generally, the drying method is used, that is, a carbon sample is placed into a weighing bottle with a lid that has been pre-dried and has a constant weight, and 3-5g of activated carbon sample is accurately weighed;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">2) Then open the lid of the weighing bottle containing the sample, place it in an electric constant temperature drying oven, and keep the temperature constant for more than 2 hours at (150&plusmn;5)&deg;C until constant weight;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">3) Then take out the weighing bottle from the constant temperature drying oven, cover it, put it into a desiccator with color-changing silica gel, cool it to room temperature and weigh it;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">4) Express the moisture content percentage as the percentage of the lost moisture mass to the original sample mass.<\/span><\/p>\n<h2 style=\"line-height: 1.6;\"><strong><span style=\"color: #000000; font-size: 14pt;\">6. pH value determination:<\/span><\/strong><\/h2>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">1) Put 1.0g activated carbon in a 200ml beaker, add 100ml distilled water, and measure the pH value using electricity;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">2) Stir with a magnetic stirrer for 1 hour, and then measure the pH value of the liquid with a pH meter;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">3) Note: According to the pH meter instructions or regular operating procedures, debug and calibrate the pH in advance. (There are national standards and industry standards for reference and comparison)<\/span><\/p>\n<h2 style=\"line-height: 1.6;\"><span style=\"color: #000000; font-size: 14pt;\"><strong>7. Ash content\/residue rate:<\/strong> <\/span><\/h2>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">The definition of activated carbon ash content refers to the percentage of the residue obtained after burning a certain amount of activated carbon sample at high temperature to the mass of the original sample.<\/span><\/p>\n<p style=\"line-height: 1.6;\">&nbsp;<\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #2dc26b;\">\u203b Detection method: Calcination with muffle furnace<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">1) First place a 30mL porcelain crucible in a muffle furnace, burn it at (800&plusmn;25)&deg;C for 1 hour, take it out and put it in a desiccator to cool to room temperature, and then accurately weigh the mass of the burned porcelain crucible;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">2) Accurately weigh 1-2g of the dried sample crushed to 71&mu;m (weighed accurately to 0.1mg), place it in a porcelain crucible that has been burned to constant weight, and then place it in an oven at (150&plusmn;5)\u2103 Dry internally for 2 hours and then cool to room temperature;<\/span><\/p>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\">3) Place the activated carbon sample and porcelain crucible in the muffle furnace, open the crucible lid, gradually increase the temperature, and burn at (650&plusmn;20)&deg;C to constant weight (about 2h) or (800&plusmn;25) Burn at \u2103 for 1 hour;<\/span><\/p>\n<p><span style=\"color: #333333;\">4) Take out the crucible and place it in a desiccator, cool it for 30 minutes, and weigh it (accurately to 0.1 mg). The percentage of the residue obtained after burning a certain amount of activated carbon sample at high temperature to the mass of the original sample.<\/span><\/p>\n<h2 style=\"line-height: 1.6;\"><strong><span style=\"color: #000000; font-size: 14pt;\">8. How much mass of harmful substances can activated carbon adsorb?<\/span><\/strong><\/h2>\n<p style=\"line-height: 1.6;\"><span style=\"color: #333333;\"> Activated carbons of different materials and uses have different internal pore sizes. The quality of high-quality activated carbon in adsorbing harmful substances can be close to or even reach its own quality, such as original ecological activated carbon loaded with coconut shell activated carbon.<\/span><\/p>","discuss":0,"seo_title":"Common Indicators of Activated Carbon | ACC Activated Carbon Expert","seo_keyword":"activated carbon,activated carbon properties,activated carbon capacity,activated carbon absorber","seo_describe":"Introduction to common indicators of activated carbon and detection methods","track_code":"","viewer":"","source_copy_id":0,"sort":45,"status":0,"data_time":"2024-03-14 10:18:23","create_time":"2024-03-14 09:54:42","update_time":"2025-04-02 09:56:43","type_items":[{"id":2083,"website_id":781,"name":"Activated Carbon","urla":""}],"tag_items":[]}}

<h1 style="line-height: 1.6;"><strong>Common Indicators of Activated Carbon</strong></h1>
<h2 style="line-height: 1.6;"><span style="color: #169179; font-size: 14pt;"><strong>1. Iodine value:</strong> </span></h2>
<p style="line-height: 1.6;"><span style="color: #333333;">Iodine value (iodine number) is a performance parameter of activated carbon and an indicator of the degree of unsaturation in organic compounds;</span></p>
<h2 style="line-height: 1.6;"><strong><span style="color: #169179; font-size: 14pt;">2. The iodine value of activated carbon is the adsorption value: </span></strong></h2>
<p style="line-height: 1.6;"><span style="color: #333333;">it refers to the number of grams of iodine that can be absorbed (added) in 100g of material;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;"><span style="color: #000000;">1) </span>Mainly used for the determination of oils, fatty acids, waxes, polyesters and other substances; </span></p>
<p style="line-height: 1.6;"><span style="color: #333333;"><span style="color: #000000;">2)</span> The greater the degree of unsaturation, the higher the iodine value; </span></p>
<p style="line-height: 1.6;"><span style="color: #333333;"><span style="color: #000000;">3) </span>The iodine value of drying oil is greater than that of non-drying oil;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">4) It should be noted that if there are two or more alkenyl groups in the molecular structure of the oil, the iodine value will be authentic only when these alkenyl groups are in a non-conjugated state;</span></p>
<h2 style="line-height: 1.6;"><strong><span style="color: #169179; font-size: 14pt;">3. Determination of the iodine value of activated carbon: </span></strong></h2>
<p style="line-height: 1.6;"><span style="color: #333333;">There are three commonly used methods:</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;"><span style="color: #000000;">1)</span> The carbon tetrachloride solution of oil and fat is titrated with the ethanol solution of iodine and mercury dichloride;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;"><span style="color: #000000;">2) </span>Titrate with iodine chloride in glacial acetic acid solution;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;"><span style="color: #000000;">3) </span>Titration with glacial acetic acid solution containing pyridine, bromine and concentrated sulfuric acid:</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">a. The iodine value of emulsifiable butter is usually between 24 and 26; b. The iodine value of drying oil is above 130; c. The iodine value of semi-drying oil is between 100 and 130;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">d. The iodine value of non-drying oil is below 100; e. The iodine value of land animal fat is below 80; f. The iodine value of marine animal fat is above 100.</span></p>
<p style="line-height: 1.6;"><span style="text-decoration: underline;"><span style="color: #333333; text-decoration: underline;">※ The iodine values of nut shells, bamboo charcoal, and coal are all in the hundreds. The iodine values of activated carbon raw materials range from 800, 850, 900, 950, 1000, 1100mg/g, etc.</span></span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">1) Iodine value is a liquid phase adsorption index, which can generally tell the specific surface area of activated carbon and whether the micropores are developed;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">2) The key gas phase adsorption indicators are: CTC adsorption value, benzene adsorption value: good activated carbon CTC>100%, benzene adsorption>50%;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">3) Different adsorption capacities lead to different costs and prices. Activated carbon coconut shells with the same iodine value have a very good adsorption effect on small particles. Different materials of activated carbon are selected for different applications.</span></p>
<p><span style="color: #000000; font-size: 14pt;">4) Simple determination method of iodine value adsorption force:</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(1) <span style="color: #000000;">Weigh the weight with your hands:</span> If you want to improve the adsorption performance of activated carbon, you can only create as many pore structures as possible on the activated carbon. The more pores, the looser the activated carbon and the lighter the relative density. Therefore, good activated carbon feels better. It will be lighter,</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">When packaged with the same weight, the volume of activated carbon with good performance will be much larger than that of inferior activated carbon;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(2)<span style="color: #000000;"> Soak in water to see the bubbles:</span> Put a small handful of activated carbon into the water. Due to the infiltration of water, the water will gradually immerse into the pore structure of the activated carbon, forcing the air in the pores to be discharged, thus producing a series of extremely fine bubbles in the water. Pull out a fine bubble line and make a slight bubble sound at the same time. The more violent this phenomenon occurs and the longer it lasts, the better the adsorption of activated carbon;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">(3) <span style="color: #000000;">Look at the decolorization ability:</span> Another manifestation of the adsorption capacity of activated carbon is the decolorization ability. Activated carbon has the magical ability to turn colored liquids into light colors or colorless. This is actually because activated carbon adsorbs pigment molecules in colored liquids. Because of this characteristic of activated carbon, it is widely used in the production process of turning brown sugar into white sugar in the sugar industry.</span></p>
<p style="line-height: 1.6;"><strong><span style="color: #2dc26b;">※ Operation method:</span></strong></p>
<p style="line-height: 1.6;"><span style="color: #333333;">1) Take two transparent cups, put pure water into one cup, and then drop a drop of red ink (any pigment that is easy to observe but does not change the properties of the water can be used here, such as blue ink, printer color ink, but can't u</span><span style="color: #333333;">se ink and carbon ink), stir evenly and pour half of the colored water into another cup to keep as a comparison sample;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">2) Put the activated carbon into the colored water, the amount should be half or more of the water, so the effect will be more obvious; 3) After leaving it for 10-20 minutes, compare it with the comparison water sample. Under the same conditions, the stronger the decolorization effect. It is said that the better the adsorption performance is.</span></p>
<h2 style="line-height: 1.6;"><span style="color: #333333; font-size: 14pt;"><strong>4. Benzene adsorption value:</strong> </span></h2>
<p style="line-height: 1.6;"><span style="color: #333333;">Benzene is a small molecule. The benzene adsorption value is used to characterize the adsorption capacity of activated carbon for small molecule organic matter.</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">1) The greater the benzene adsorption value, the stronger the activated carbon's adsorption capacity for small-molecule organic matter; 2) Weigh the activated carbon, place it in a container filled with benzene vapor, take it out after 24 hours of adsorption, weigh it, and calculate the difference between the two weights. The difference is the benzene adsorption value.</span></p>
<h2 style="line-height: 1.6;"><strong><span style="color: #333333; font-size: 14pt;"><span style="color: #000000;">5. Moisture/moisture content:</span> </span></strong></h2>
<p style="line-height: 1.6;"><span style="color: #333333;">The definition of moisture content of activated carbon refers to the percentage of moisture content lost in the mass of the original sample after a certain amount of activated carbon sample is dried, constant temperature, constant weight, and cooled.</span></p>
<p style="line-height: 1.6;"><img src="https://oss.matchpages.cn/matchpages/common/2023/1108/7316/654b3310b09a6/activated-carbon-allcarbon.png" alt="activated carbon products " width="900" data-resolution="1806*396" /></p>
<p style="line-height: 1.6;"><strong><span style="color: #2dc26b;">※ Detection method:</span></strong></p>
<p style="line-height: 1.6;"><span style="color: #333333;">1) Generally, the drying method is used, that is, a carbon sample is placed into a weighing bottle with a lid that has been pre-dried and has a constant weight, and 3-5g of activated carbon sample is accurately weighed;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">2) Then open the lid of the weighing bottle containing the sample, place it in an electric constant temperature drying oven, and keep the temperature constant for more than 2 hours at (150±5)°C until constant weight;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">3) Then take out the weighing bottle from the constant temperature drying oven, cover it, put it into a desiccator with color-changing silica gel, cool it to room temperature and weigh it;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">4) Express the moisture content percentage as the percentage of the lost moisture mass to the original sample mass.</span></p>
<h2 style="line-height: 1.6;"><strong><span style="color: #000000; font-size: 14pt;">6. pH value determination:</span></strong></h2>
<p style="line-height: 1.6;"><span style="color: #333333;">1) Put 1.0g activated carbon in a 200ml beaker, add 100ml distilled water, and measure the pH value using electricity;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">2) Stir with a magnetic stirrer for 1 hour, and then measure the pH value of the liquid with a pH meter;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">3) Note: According to the pH meter instructions or regular operating procedures, debug and calibrate the pH in advance. (There are national standards and industry standards for reference and comparison)</span></p>
<h2 style="line-height: 1.6;"><span style="color: #000000; font-size: 14pt;"><strong>7. Ash content/residue rate:</strong> </span></h2>
<p style="line-height: 1.6;"><span style="color: #333333;">The definition of activated carbon ash content refers to the percentage of the residue obtained after burning a certain amount of activated carbon sample at high temperature to the mass of the original sample.</span></p>
<p style="line-height: 1.6;"> </p>
<p style="line-height: 1.6;"><span style="color: #2dc26b;">※ Detection method: Calcination with muffle furnace</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">1) First place a 30mL porcelain crucible in a muffle furnace, burn it at (800±25)°C for 1 hour, take it out and put it in a desiccator to cool to room temperature, and then accurately weigh the mass of the burned porcelain crucible;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">2) Accurately weigh 1-2g of the dried sample crushed to 71μm (weighed accurately to 0.1mg), place it in a porcelain crucible that has been burned to constant weight, and then place it in an oven at (150±5)℃ Dry internally for 2 hours and then cool to room temperature;</span></p>
<p style="line-height: 1.6;"><span style="color: #333333;">3) Place the activated carbon sample and porcelain crucible in the muffle furnace, open the crucible lid, gradually increase the temperature, and burn at (650±20)°C to constant weight (about 2h) or (800±25) Burn at ℃ for 1 hour;</span></p>
<p><span style="color: #333333;">4) Take out the crucible and place it in a desiccator, cool it for 30 minutes, and weigh it (accurately to 0.1 mg). The percentage of the residue obtained after burning a certain amount of activated carbon sample at high temperature to the mass of the original sample.</span></p>
<h2 style="line-height: 1.6;"><strong><span style="color: #000000; font-size: 14pt;">8. How much mass of harmful substances can activated carbon adsorb?</span></strong></h2>
<p style="line-height: 1.6;"><span style="color: #333333;"> Activated carbons of different materials and uses have different internal pore sizes. The quality of high-quality activated carbon in adsorbing harmful substances can be close to or even reach its own quality, such as original ecological activated carbon loaded with coconut shell activated carbon.</span></p>