A kind of preparation method of modified activated carbon
A technology of activated carbon and modification, applied in the field of preparation of modified activated carbon, can solve the problems of difficult industrial production, high energy consumption, complicated operation steps, etc., and achieve the effects of low cost, simple operation process, and improved adsorption performance.
Active Publication Date: 2020-10-02
江苏中科锐纳环境科技有限公司
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Problems solved by technology
[0003] Organic acid modification can increase the acidic oxygen-containing groups on the surface of activated carbon, which can significantly improve the adsorption of formaldehyde and other volatile organic gases; single transition metal modification can also increase the unit adsorption of activated carbon to toluene, but the operation steps cumbersome, high energy consumption, and difficult industrial production
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[0025] Wash the activated carbon with deionized water for 3 to 5 times until the supernatant is clarified to fully remove the impurities on the surface of the activated carbon, and then place it in a drying oven at 80°C for 24 hours to obtain pretreated activated carbon; Ratio 16:1, put the pretreated activated carbon in 0.5mol / L oxalic acid solution, shake it at 110r / min in a constant temperature water bath shaker at 60°C for 2h, wash it with deionized water 5 times, and finally wash it at 80°C Vacuum dry for 24 hours; according to the transition metal salt solution and activated carbon liquid-solid ratio of 16:1, the activated carbon treated with organic acid was placed in 0.5mol / L manganese chloride solution, and heated in a constant temperature water bath shaker at 60°C at 110r / min After shaking for 2 hours, wash with deionized water for 5 times, and finally vacuum-dry at 80°C for 24 hours to obtain modified activated carbon.
[0026] The specific experimental analysis is ...
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The invention discloses a preparation method of modified activated carbon. The surface carboxyl groups of the activated carbon are increased by means of two-step modification of organic acid and transition metal ions, so that the bonding force between the transition metal ions and the surface of the activated carbon is enhanced, and the dispersity of the metal ions is effectively improved; furthermore, due to the reducibility of the carboxyl groups, the metal ions can be reduced into metal simple substances or low-valent metal ions, and the low-concentration methylbenzene absorption property of the activated carbon is remarkably improved. The preparation method provided by the invention is simple in operation process and low in cost, and the modified activated carbon can be prepared into protective products such as activated carbon filter elements for popularization and application.
Description
technical field [0001] The invention relates to the technical field of volatile organic gas treatment, in particular to a preparation method of modified activated carbon. Background technique [0002] Volatile organic compounds (VOCs) are pollutants commonly found in indoor and outdoor ambient air, mainly from industrial processes and organic waste gases emitted by motor vehicles. Among them, toluene has attracted widespread attention in recent years due to its characteristics of toxicity, high reactivity, carcinogenicity and gene mutation. At present, the most common method for dealing with VOCs is the adsorption method, especially for dealing with low concentrations of VOCs in the environment. Activated carbon adsorption is proved to be a more suitable method for organic gas treatment because of its low cost and high efficiency. At present, the more commonly used activated carbon modification methods are inorganic acid / alkali, organic acid, loading transition element met...
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Patent Timeline
Login to View More IPC IPC(8): C01B32/30B01J20/20B01J20/30B01J20/28B01D53/04
CPCB01D53/04B01D2257/708B01J20/20B01J20/28061B01J20/28071B01J20/28083B01J20/3085C01B32/30
Inventor 黄宇彭仕琪朱丹丹赵全喜
Owner 江苏中科锐纳环境科技有限公司