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A carbon-based heavy metal capture agent and preparation method thereof
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A heavy metal trapping agent and trapping agent technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problem of low adsorption capacity and achieve excellent adsorption performance
Active Publication Date: 2022-05-17
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV +1
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Problems solved by technology
Carbon materials have many advantages, such as non-toxicity, low cost, low power consumption, high efficiency and convenient recycling, etc., and have received extensive attention in environmental treatment. However, the adsorption capacity of existing carbon materials for heavy metal adsorption is low, and it is difficult to meet the requirements.
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preparation example Construction
[0021] A preparation method of a carbon-based heavy metal scavenger, in a specific embodiment, comprises the following steps:
[0022] 1) Pretreating carbon-containing raw materials under certain conditions to obtain intermediate products;
[0023] 2) carbonizing the intermediate product under inert gas protection and a certain temperature for 0.5 to 10 hours to obtain the first capture agent; if the oxygen content of the first capture agent is <15%, then proceed to the following steps:
[0024] 3) Mixing the first capture agent and the oxygen-containing activator according to a certain ratio, and continuing to treat for 0.5 to 10 hours under the protection of an inert gas at a certain temperature, to obtain the second capture agent;
[0025] 4) The second trapping agent is activated for 0.5-6 hours under the protection of an inert gas at 600-1000° C. to obtain the third trapping agent.
[0026] The pretreatment in step 1) can remove most of the volatile components in the car...
Embodiment 1
[0036] A kind of preparation method that takes PAN as raw material carbon-based heavy metal trapping agent, comprises the following steps:
[0037] 1) Put 2g of PAN precursor into a porcelain boat and pre-oxidize for 2 hours under air condition at 250°C to obtain an intermediate product;
[0038] 2) The intermediate product was carbonized at a low temperature of 400° C. for 1 hour under the protection of nitrogen to obtain the first capture agent. It was measured that the oxygen content of the first capture agent was 12%, and the next step was continued:
[0039] 3) Mix the first capture agent and KOH powder according to the weight ratio of 2:1, and continue to process at 400°C for 1 hour to obtain the second capture agent;
[0040] 4) Activate the second capture agent at 800° C. for 2 hours under the protection of nitrogen to obtain the third capture agent C1.
Embodiment 2
[0042] A preparation method of a carbon-based heavy metal scavenger taking cellulose as a raw material, comprising the following steps:
[0043] 1) Pre-oxidize 2 g of cellulose at 150° C. for 1 hour under air condition to obtain an intermediate product;
[0044] 2) The intermediate product was heated at 450° C. for 2 hours under the protection of argon, cooled naturally, taken out and ground to obtain the first capture agent B2.
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Abstract
The invention discloses a carbon-based heavy metal capture and a preparation method thereof. The preparation method comprises the following steps: 1) pretreating carbon-containing raw materials under certain conditions to obtain an intermediate product; 2) protecting the intermediate product under inertgas protection and a certain carbonization at high temperature for 0.5 to 10 hours to obtain the first trapping agent; if the oxygen content of the first trapping agent<15%, then proceed to the following steps: 3) combine the first trapping agent and the oxygen-containing activator according to a certain Proportional mixing, continued treatment under inertgas protection and a certain temperature for 0.5-10 hours to obtain the second capture agent; 4) activate the second capture agent under the protection of inert gas and 600-1000°C for 0.5-6 hours to obtain the third capture agent capture agent. The carbon-based heavy metal trapping agent prepared by the invention can effectively trap heavy metal ions in water at room temperature.
Description
technical field [0001] The invention relates to the field of heavy metal trapping agent and catalysis, and more specifically relates to a carbon-based heavy metal trapping agent and a preparation method thereof. Background technique [0002] The discharge of heavy metal ion pollutants produced in industry and life not only enters the soil and water sources at present, but also enters the human body through the food chain, threatening human health. Moreover, heavy metal ions are extremely difficult to disappear naturally, and will cause continuous pollution to the environment after flowing into the circulatory system. How to collect and treat the heavy metal ions produced in the industrial production process is one of the environmental problems to be solved urgently. [0003] Carbon material is a traditional and constantly developing material. With the deepening of technology and related research, the research and application of carbon material as catalytic carrier and adsorp...
Claims
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