A preparation method and application of magnetic microalgae-based biochar
A technology of biochar and microalgae, applied in the field of water treatment, can solve the problems of high cost, limited activation effect of hydrogen peroxide and persulfate, difficulty in large-scale practical application, etc., achieve easy separation, increase catalytic active sites, promising effect
Active Publication Date: 2020-07-24
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI +1
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Problems solved by technology
However, its cost is high, and it is difficult to apply it on a large scale in a short period of time.
The more common activated carbon has very limited activation effect on hydrogen peroxide and persulfate.
Method used
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Embodiment 1
[0058]Disperse 30 g of spirulina powder in 500 mL of 4% ferric nitrate nonahydrate aqueous solution, and stir thoroughly for 12 hours. The algal cells were separated by centrifugation, and then washed five times with ultrapure water to remove excess ferric nitrate. Disperse the washed algae cells into 500 mL of 6% NaOH solution, heat to 105°C, condense and reflux for 2 hours. After the reaction, the microalgae cells separated by centrifugation were repeatedly washed 5 times with ultrapure water. Finally, the centrifuged algal cells were placed in a quartz boat and calcined under a nitrogen atmosphere. The heating rate is 2.5 degrees centigrade / minute, heated to 300, 400, 500 or 600 degrees centigrade for 2 hours, and after cooling to room temperature, the calcined sample is cleaned, dried and ground. The obtained magnetic microalgae-based biochar samples are represented by Fe-N@MCx, where x (300, 400, 500, 600) is the pyrolysis temperature.
[0059] figure 1 a is the XRD p...
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Abstract
The invention discloses a preparation method and application of magnetic microalgae-based biochar. The method comprises the steps of adding microalgae into a solution containing iron salt, performingalkali-heat treatment, and then performing high-temperature pyrolysis carbonization to obtain the magnetic microalgae-based biochar. According to the method disclosed by the invention, ferroferric oxide is introduced into the microalgae-based biochar, so that active sites can be increased; the catalytic capability can be improved; the magnetism of a catalytic material can be enhanced; and separation is easy. Under the condition of the presence of persulfate, the pyrolysis temperature and application conditions of the magnetic microalgae-based biochar are optimized, so that active species can be effectively generated in a process of activating the persulfate by the magnetic microalgae-based biochar; electron transfer between contaminants and catalysts is promoted; and the effect of catalyzing and degrading the contaminants is improved. The operation method is simple and is easy to implement; raw materials are easy to obtain; the cost is low; and good popularization and implementation prospect in practical application is realized.
Description
technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method and application of magnetic microalgae-based biochar. Background technique [0002] The algae bloom caused by the eutrophication of the lake will destroy the water ecological balance and the algal toxin produced by microalgae will pose a threat to the safety of drinking water. The current conventional mechanical and chemical methods cannot completely treat and dispose of the massive growth of microalgae in water blooms. The resource utilization of microalgae can not only solve the problem of massively multiplied algal cells, but also convert them into beneficial resources in production and life. Therefore, resource utilization of microalgae has become an alternative. Microalgae are composed of organic matter such as proteins, lipids, and polysaccharides, as well as a variety of inorganic elements. They are currently widely used in medici...
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IPC IPC(8): B01J23/745C02F1/72C02F101/36C02F101/38
Inventor 王东升邹瑜斌肖峰门彬任睿君林芳向
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI