Physically activated carbon related questions

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Physically activated carbon02021-04-16 01:08:44
Generally speaking, activated carbon with very rich micropores can be successfully obtained by chemical activation followed by physical activation.It was found that after chemical activation with ZnCH and physical activation with carbon dioxide, walnut activated carbon could further open and expand pores.H The lignocellulosic activated carbon was activated by mixing H,PO and ICOZ to obtain super activated carbon with high specific surface areaThe chemical modification of the adsorption surface of activated carbon material is to improve the structure of the functional groups and surrounding atmosphere on the adsorption surface of activated carbon material by certain methods, so as to make it become the active point in the specific adsorption process, so as to control the hydrophilic or hydrophobic properties and the binding ability with metal or metal oxides.Surface chemical properties of activated carbon materials can be modified by oxidation modification, reduction modification, metal loading modification, acid base modification, heteroatom carrying and compound modification, graft polymerization, etc. Surface oxidation modification of activated carbon Surface oxidation modification is mainly to oxidize the functional groups on the surface of activated carbon materials by using appropriate oxidants at appropriate temperatures, so as to improve the content of oxygen-containing groups on the surface of carbon materials, enhance the surface hydrophilicity and polarity, and enhance the adsorption capacity of polar substances. The number and types of oxygen-containing functional groups are different after treatment with different oxidants.Oxidation treatment also changed the void structure of activated carbonThe commonly used modified oxidants mainly include HNO, HClO, HPO, H,SO4, HF, O and HO, etc.activated charcoal wholesale bulk  Oxidant HNO;After the modified activated carbon was treated with proper amount of nitric acid, the mesopore increased, the ratio of carboxylic hydroxyl increased, the surface polarity of activated carbon increased, and the adsorption capacity of some solutes with certain polarity increased.However, excessive nitric acid modification treatment will increase the unstable groups on the surface of activated carbon and fail to achieve the predetermined effect 18-20]. The experimental results show that the surface structure of the activated carbon material modified by FeSO changes: the specific surface area decreases, the surface oxygen content increases, the plane of the random layer graphite carbon net is destroyed to a certain extent, and the ammonia absorption capacity and benzene absorption performance of the sample are greatly enhanced.He ChunHong et al. [reported the research progress of supporting activated carbon materials in the removal of SO; the removal ability of SO was significantly enhanced after supporting Co, Ni, Mg, and V compounds, which was due to the formation of Co(OH)2, Ni(OH)2, Mg (OH)2, and V,0 microcrystals on the surface of activated carbon after supporting, which enhanced the desulfurization activity of activated carbon. yrdcarbon 
Physically activated carbon02021-04-16 00:30:56
The modification method that combines the two methods of physical activation and chemical activation is called the combination of physical and chemical modification Generally speaking, activated carbon with very rich micropores can be successfully obtained by chemical activation followed by physical activation.It was found that after chemical activation with ZnCH and physical activation with carbon dioxide, walnut activated carbon could further open and expand pores.H The lignocellulosic activated carbon was activated by mixing H,PO and ICOZ to obtain super activated carbon with high specific surface areaThe chemical modification of the adsorption surface of activated carbon material is to improve the structure of the functional groups and surrounding atmosphere on the adsorption surface of activated carbon material by certain methods, so as to make it become the active point in the specific adsorption process, so as to control the hydrophilic or hydrophobic properties and the binding ability with metal or metal oxides.Surface chemical properties of activated carbon materials can be modified by oxidation modification, reduction modification, metal loading modification, acid base modification, heteroatom carrying and compound modification, graft polymerization, etc. Surface oxidation modification of activated carbonfused alumina manufacturer  Surface oxidation modification is mainly to oxidize the functional groups on the surface of activated carbon materials by using appropriate oxidants at appropriate temperatures, so as to improve the content of oxygen-containing groups on the surface of carbon materials, enhance the surface hydrophilicity and polarity, and enhance the adsorption capacity of polar substances.www.hslabrasive.com   The number and types of oxygen-containing functional groups are different after treatment with different oxidants.Oxidation treatment also changed the void structure of activated carbonThe commonly used modified oxidants mainly include HNO, HClO, HPO, H,SO4, HF, O and HO, etc. Oxidant HNO;After the modified activated carbon was treated with proper amount of nitric acid, the mesopore increased, the ratio of carboxylic hydroxyl increased, the surface polarity of activated carbon increased, and the adsorption capacity of some solutes with certain polarity increased.However, excessive nitric acid modification treatment will increase the unstable groups on the surface of activated carbon and fail to achieve the predetermined effect 18-20]. After modified by HCIO with mild oxidation, the number of oxygen-containing groups on the surface of activated carbon increased, but the micropore structure and specific surface area did not change much.After ozonation treatment, the number of oxygen-containing acid functional groups on the surface of activated carbon and the surface acidity increased, and the adsorption rate and capacity of C** increased. P-Morwski et al. 2 used HNO to oxidize the carbon synthesized from phenols, and the adsorption performance of the treated activated carbon material to trihalomethane was greatly improved.Shan Xiaomei et al. 2 found that the surface area and pore volume of activated carbon decreasedafter high concentration of HNO treatment. However, the surface and pore volume of activated carbon increased after low concentration HNO treatment.(NH4) S0.Oxidation changes the micropore size distribution of coal-based carbon, but has little effect on the micropore size distribution of coconut-shell carbon. In addition, the number of carboxyl groups on the surface of activated carbon increased obviously after modification of HNO, (NH4)S 
What is the majority of carbonization process of activated carbon? How to produce high quality activated carbon in large quantities02021-07-10 01:00:27
Generally speaking, forming carbon can be mixed with a variety of raw coal to adjust the pore distribution characteristics of the final product, so as to obtain some special application performance, and more than 80% of the pore distribution characteristics of raw coal directly broken carbon has been determined by the raw material, so the performance and use is simple.activated carbon manufacturers  (2) wood activated carbon.It is mshell/core activated carbon.Such as coconut shell carbon, apricot kernel carbon, peach kernel carbon, etc.(4) petroleum activated carbon.Using petroleum asphalt, petroleum coke as raw materials, made of activated carbon products.resin activated carbon.Using phenolic resin, waste ion exchange resin as raw materials, through a special process of activity.Carbon products, sometimes fibrous carbon also falls into this category.High - definition watermark of cut document under air(6) other small varieties of activated carbon products. Made of animal blood blood carbon, made of animal bones bone charcoal (there is very little, but bone charcoal carbon main ingredients of hydroxy calcium phosphate), with active carbon molecular sieve made of various materials, made of strong base and carbon materials of high surface area activated carbon, is made of organic polymer solution after mold made of special process method of activated carbon, activated carbon aerogels and so on. coal activated carbon manufacturer  Some of them are very small production and dosage, and some are still in the laboratory research stage, so they are included in the category of small varieties of activated carbon products. ade of all kinds of hard wood, crop wastes, and other industrial and agricultural wastes containing lignocellulose The beansMaterial as raw material, through the chemical method, physical method or physical-chemical combination of activated carbon. 
Why activated carbon granular shell activated carbon has such a good effect02021-06-28 18:55:05
High-quality granular activated carbon must have good adsorption performance and strength. Like powdery activated carbon, the adsorption performance of granular activated carbon depends largely on the characteristics of pore structure. The adsorption performance index can be analyzed and characterized by different methods, such as the decolorization performance of activated carbon expressed by methylene blue. Other performance indexes include iodine adsorption value, caramel decolorization rate, etc.dxdcarbon carbon  The pore structure characteristics and specific surface area of activated carbon are usually obtained by measuring nitrogen adsorption isotherm at low temperature with adsorption In addition, the adsorption capacity of activated carbon also has a great relationship with its internal pore structure, pore size distribution and surface chemical properties. activated carbon suppliers in uae  Chemical method in addition to certain micropores, macropores, there are more mesopores (transition pores), so it is more suitable for the application of liquid phase, adsorption of larger molecules of substances, such as sugar solution has a good decolorization effect; When purifying water quality, it can also remove the colored material well and achieve the specified chroma requirements. The kinetic activity value of adsorbent is the main basis for the design of adsorption system. The adsorption rateThe adsorption process often takes a long time to reach equilibrium, and the contact time is limited in the actual production process.Therefore, the amount of adsorption depends on the adsorption rate, and the adsorption rate is related to the adsorption process, the adsorption process can be divided intoThe adsorption process often takes a long time to reach equilibrium, and the contact time is limited in the actual production process.Therefore, the amount of adsorption depends on the adsorption rate, and the adsorption rate is related to the adsorption process, which can be divided into the following steps (1) External diffusion, the adsorbate from the main air flow through the air film around the particles to the outer surface of the adsorbent; (2) Internal diffusion, the adsorbate from the outer surface through micropores to the surface of the adsorbent micropores (3) adsorption, the adsorbent reached the microporous surface of the adsorbent is adsorbed (4) The desorbed adsorbate diffuses to the main body of the gas phase through internal and external diffusionPhysical adsorption process is generally controlled by internal and external diffusion, chemical adsorption is controlled by both surface dynamics and internal and external diffusion.Because of the complexity of the adsorption process and many influencing factors, it is difficult to derive the rate theoretically, so it is generally determined by experience or model experiment. 
What is the difference between coconut shell activated carbon and columnar activated carbon?02021-02-02 17:57:10
1. First of all, it is clear from the appearance that the columnar activated carbon has the appearance of black cylindrical particles. coconut shell activated carbon for gold recovery The appearance of coconut shell activated carbon is black amorphous granular. 2. The difference between columnar activated carbon and coconut shell activated carbon in terms of material. The columnar activated carbon is made of fine anthracite as raw material and refined by advanced technology. Coconut shell activated carbon is made of fine coconut shell through a series of production processes. 3. Columnar activated carbon and coconut shell activated carbon have different physical and chemical indicators and components. Coconut shell activated carbon and columnar activated carbon can also be used for the purification of toxic gases, waste gas treatment, industrial and domestic water purification, solvent recovery, etc. buy bulk activated carbon pellets Based on the standards produced by activated carbon manufacturers, which one to choose depends on the needs of users and the scope of use. 4. The price of columnar activated carbon and coconut shell activated carbon can be said to be very different. Compared with coconut shell activated carbon with the same effective content or composition, the price of coconut shell activated carbon is much higher than that of columnar activated carbon. 
Activated carbon are widely used Activated carbon purifies how clean water is 02021-07-18 23:14:58
Adsorption capacity refers to the amount of adsorbents adsorbed on the adsorbent per unit mass under certain conditions. It is usually expressed in terms of K adsorbents /kg of adsorbent or mass percentage, which is a sign of the adsorption capacity of the adsorbent. In industry, the amount of adsorption is called the activity of the adsorbent.activated carbon powder suppliers  The activity of the adsorbent can be expressed in two ways :(1) the static activity of the adsorbentUnder certain conditions, the equilibrium adsorption capacity of the adsorbent is its static activity.For a certain adsorption system, the static activity depends only on the adsorption temperature and the concentration or partial pressure of the adsorbed substance.https://www.activated-carbon-pellets.com   Dynamic activity of adsorbents Under certain operating conditions, the gas mixture by adsorption bed, adsorption by adsorption, adsorption after a period of time, when starting from the adsorbent in the laminar flow of the gas adsorbed mass (or its concentration reaches a specified value), think bed fire, adsorption properties of adsorbent adsorption quantity at this time is called dynamic activity of adsorbent. The activity is not only related to the characteristics of adsorbents and adsorbents, but also related to temperature, concentration and operating conditions. 
I love activated carbon. Activated carbon is good for the environment02021-06-29 19:39:21
Activated carbon powder injection combined with bag dust collector (ACI+ BF) is an effective and widely used method to control dioxin emission from incinerator flue gas.https://www.activated-carbon-pellets.com/  In order to provide reference and theoretical basis for the preparation and selection of activated carbon for the adsorption of dioxins, this paper carried out a study on the combined technology of activated carbon injection and double bag dust collector, the characteristics of activated carbon adsorption for dioxins and the influencing factors of activated carbon adsorption for dioxins.The adsorption and desorption isotherms of 13 kinds of commercial activated carbon were determined by low temperature nitrogen adsorption method, and the physical structures of activated carbon were calculated according to BET, T-Plot, BJH and DFT theory, and the iodine value and methylene blue value of 4 kinds of activated carbon were detected. The physical structure characteristics of activated carbon were analyzed in detail to prepare for the subsequent experiment. Using small activated carbon fixed bed adsorption gas phase dioxin test bench, a typical activated carbon adsorption dioxin factors affecting the experimental study, discusses the types of dioxin adsorption activated carbon and activated carbon fixed bed adsorption gas phase characteristics of dioxins, and discusses the adsorption temperature and adsorption time of activated carbon adsorption of dioxins.The results showed that the specific surface area and micropore volume of activated carbon had weak correlation with the adsorption efficiency of dioxins.wan yang carbon   The mesopore volume of activated carbon is an important factor to determine the adsorption capacity of dioxins. The surface area of the pore size between 2 nm and 20nm plays a key role in the adsorption of dioxins.The higher the adsorption temperature, the lower the adsorption efficiency of activated carbon.The longer the adsorption time, the lower the adsorption efficiency of activated carbon.There is no selective adsorption of gaseous dioxins in activated carbon fixed bed. 
Principle of activated carbon reaction Activated carbon02021-07-18 20:47:03
Activated carbon, is black powder or block, granular, honeycomb amorphous carbon, but also a regular arrangement of crystalline carbon.In addition to carbon elements, activated carbon also contains two kinds of admixtures: one is the chemical combination of elements, mainly oxygen and hydrogen, these elements are due to incomplete carbonization and residual in the carbon,https://www.activated-carbon-pellets.com   or in the activation process, foreign non-carbon elements and activated carbon surface chemical combination;Another kind of admixture is ash, which is the inorganic part of activated carbon, and ash in active carbon is easy to cause secondary pollution.Because of its strong adsorption, activated carbon is widely used in production,In the life.Activated carbon material is processed by the amorphous carbon, has a large specific surface area, the gas, solution of inorganic or organic matter and colloidal particles have good adsorption capacity.Activated Carbon materials mainly include Activated Carbon (AC) and Activated Carbon Fibers (ACF), etc.Activated carbon material as a kind of excellent adsorbent, mainly because of its unique adsorption surface structure and surface chemical properties.Activated carbon material has stable chemical properties and high mechanical strength. activated carbon powder suppliers 
Research experiments on carbon dioxide and activated carbon02021-07-02 20:19:04
The pore structure characteristics and specific surface area of activated carbon are usually obtained by measuring nitrogen adsorption isotherm at low temperature with adsorption In addition, the adsorption capacity of activated carbon also has a great relationship with its internal pore structure, pore size distribution and surface chemical properties. activated carbon manufacturers  Chemical method in addition to certain micropores, macropores, there are more mesopores (transition pores), so it is more suitable for the application of liquid phase, adsorption of larger molecules of substances, such as sugar solution has a good decolorization effect; When purifying water quality, it can also remove the colored material well and achieve the specified chroma requirements.dxdcarbon.com   Particle strength is also a main index of granular activated carbon. In order to improve the particle strength of granular activated carbon, usually take some special processing measures, such as adding some material help plasticizing and proper mechanical treatment 4 or control in the process of kneading kneading temperature and kneading time, can greatly improve the strength of granular activated carbon particles, making the strength of the granular activated carbon has reached the fruit shell carbon intensity index. apparatus. For the gas phase adsorption, the size of the gas molecules is usually less than 1. ONM, the use of microporous activated carbon; For liquid-phase decolorization refining, due to the large size of the liquid molecules, it is necessary to use activated carbon with developed mesopore. Activated carbon has a large specific surface area and a particularly developed micro-pore structure, which is the main reason for its strong adsorption capacity and large adsorption capacity. 
Research experiments on carbon dioxide and activated carbon02021-06-30 01:42:04
Adsorption capacity refers to the amount of adsorbents adsorbed on the adsorbent per unit mass under certain conditions. It is usually expressed in terms of K adsorbents /kg of adsorbent or mass percentage, which is a sign of the adsorption capacity of the adsorbent. In industry, the amount of adsorption is called the activity of the adsorbent.activated carbon suppliers south africa  The activity of the adsorbent can be expressed in two ways :(1) the static activity of the adsorbentUnder certain conditions, the equilibrium adsorption capacity of the adsorbent is its static activity.For a certain adsorption system, the static activity depends only on the adsorption temperature and the concentration or partial pressure of the adsorbed substance.https://www.yrdcarbon.com/  Dynamic activity of adsorbents Under certain operating conditions, the gas mixture by adsorption bed, adsorption by adsorption, adsorption after a period of time, when starting from the adsorbent in the laminar flow of the gas adsorbed mass (or its concentration reaches a specified value), think bed fire, adsorption properties of adsorbent adsorption quantity at this time is called dynamic activity of adsorbent. The activity is not only related to the characteristics of adsorbents and adsorbents, but also related to temperature, concentration and operating conditions. 
Research experiments on carbon dioxide and activated carbon02021-06-22 03:17:29
Microwave method, microwave method is not independent of the physical method and chemical method of the preparation of activated carbon, but on the basis of the physical method and chemical method instead of the traactivated charcoal pellets  Microwave refers to the electromagnetic radiation located between far-infrared and radio waves in the electromagnetic spectrum, with a frequency range of 300MHz to 300GHz and a wavelength of 1m to 1mmMicrowave generates "internal friction heat" through high frequency reciprocating motion of dipole molecules in the heated body, which raises the temperature of the material. It does not require any heat conduction process, and has the characteristics of high efficiency, selectivity, non-contact, integrity, uniformity, quick start and stop, and easy operation Studies have shown that activated carbon can effectively absorb microwave energy and make the temperature rise to 110o℃5' within a few minutes.www.wyactivatedcarbon.com   Microwave heating can produce good effects in the preparation and modification of activated carbon (S2. Microwave modification, many backwater hole is opened, the distributed capacitance change obviously, promoting the improvement of the adsorption. The microwave power and irradiation time are key determinants of modified activated carbon adsorption performance. On the mechanism of microwave carbonization and activation, it is generally believed that Plant waste is mostly made of plant fiber raw materials, in the plant body under the action of capillary, modified solution absorbed by material whole fully, between fiber is filled with the subtle space, make the dry material volume expansion after soaking wet, and reaction. Because of the water in the raw material, modified solution constitute a polar molecule, with a strong absorption of microwave dielectric properties,Therefore, polar molecules collide and rub violently with microwave frequency, generating a large amount of heat, which makes water and modified solution volatilize rapidly, and generate steam pressure, which explodes out from the inside of the raw material to the outside. This sharp action makes the fiber space of the raw material expand and produce sharp drying.In this way, the raw material has a more obvious pore structure and a larger internal specific surface area than before microwave irradiation. Compared with the traditional heating method, the mechanism of microwave in the preparation process of activated carbon is completely different.It shows its unique advantages: high efficiency, energy saving, uniformity, selectivity, low pollution, high thermal efficiency, low energy consumption, simple process and equipment and small footprint, conducive to automation, low carbon loss, and recovery of useful substances. 
Research experiments on carbon dioxide and activated carbon02021-06-23 02:04:22
The industrial and industrial production of graphene with low cost and large output can be completed, which will greatly promote the development of downstream industries.https://www.dxdcarbon.com   Using graphene's remarkable physical and chemical properties, electrons can travel through graphene much faster than they can through silicon, creating more sensitive sensors, electronic components, displays, solar cells and hydrogen storage devices. Pacific Northwest National Laboratory and Princeton University are working with a private company to develop a high-capacity, fast-charging battery. The secret is to add graphene to lithium-ion batteries to improve power and cycle stability.wholesale activated carbon pellets  Researchers at Stanford University say graphene-based lighting could be cheap and environmentally friendly. 

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