Activated carbon is an excellent adsorbent. It is a black porous solid with well-developed pore structure. It has a large specific surface area after modification. It can generally be as high as 1000~3000m2·g-1, for inorganic or organic substances and colloidal particles in gases and solutions. And so on have a strong adsorption capacity. The adsorption of organic matter by activated carbon is related to the properties of activated carbon, organic properties and adsorption conditions, including the specific surface area of ​​activated carbon. It is widely used in various fields such as food industry, chemical industry and environmental protection because it can effectively adsorb gases, colloidal substances and organic pigments. It also has one of the biggest features that can be regenerated after saturation. Activated carbon has a large adsorption performance and mainly has a porous structure, and has large adsorption capacity and high speed.
Research progress in the adsorption of organic compounds by oxidative modification and reduction-modified activated carbon by domestic and foreign scholars. The specific surface area, surface functional group and surface pHpzc of the oxidatively modified and reduced modified activated carbon are changed, so the adsorption of liquid and gaseous organic substances changes. The adsorption mechanism is mainly through changing the action form and size of the three forces, namely diffusion force, supply-acceptance mechanism and electrostatic action. Oxidation-modified activated carbon is not conducive to the adsorption of organic matter in aqueous solution. The reduction of modified activated carbon is beneficial to the adsorption of organic matter in aqueous solution. Both oxidative modification and reduction-modified activated carbon are beneficial for the adsorption of polar organic compounds in gaseous form.
Taking China's rich coal-based granular activated carbon as raw material, the new modification process of high-efficiency activated carbon for oil and gas adsorption was discussed. The granular activated carbon used in this study has the following advantages:
1) Large specific surface area and high effective adsorption capacity.
2) Diverse shapes, easy to select for engineering.
3) Good security.
4) High strength, long life, no secondary pollution to the organic matter adsorbed and recovered and the purified gas.
5) Easy to regenerate. The effects of activator type, activation time, microwave power, microwave irradiation time and the aspect ratio of adsorption column on the adsorption capacity of oil and gas, the influence of the number of activated carbon on the adsorption and residual amount of oil and gas, vacuum degree and vacuum desorption time were studied. The effect of desorption of activated carbon. Experiments show that the KH2PO4 solution with a concentration of 10% is activated for 6 hours, and then heated by microwave irradiation for 4.3 minutes. The activated carbon has the largest oil and gas adsorption capacity; the absolute pressure of desorption is 1 kPa, and the vacuum desorption is 2 hours, the desorption effect of activated carbon better. The modified activated carbon samples were subjected to BET specific surface area measurement, electron scanning electron microscopy analysis, composition analysis, and Fourier transform infrared spectroscopy FT-IR characterization. The results showed that the KH2PO4 solution with 10% concentration was immersed for 6 hours, and the specific surface area of ​​activated carbon changed by microwave modification for 4.3 minutes was not changed, but the functional groups increased, the pore size was dense, the type of modifier and activation time, microwave power and microwave radiation. Photographic time is the main factor affecting the adsorption performance of activated carbon. The hexane content of oil and gas is 8000ppm, the flow rate is 0.3L/min, suction...
After the modification of activated carbon: surface structure characteristics, surface chemistry and electrochemical properties, the research progress in the modification of activated carbon at home and abroad is described. The surface structure property modification is mainly carried out from the aspects of increasing the specific surface area and controlling the pore size distribution, thereby increasing the adsorption amount; the surface chemical modification mainly changes the relative content of the surface oxygen-containing acidic and basic groups by redox and The metal is modified to change the adsorption capacity for polar, weak or non-polar substances. The electrochemical modification is mainly to change the chargeability of the activated carbon surface and the chemical properties generated by the addition of a micro electric field. Change, thereby changing the adsorption performance. Finally, this paper also objectively proposes the future development direction from the adsorption properties of activated carbon.
Therefore, the increase of specific surface area after activated carbon modification has an excellent adsorption effect on oil and gas, and the penetration point is extremely high.
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