Method for preparing magnetic biomass charcoal from potamogeton crispus and application thereof

Abstract

The invention discloses a method for preparing magnetic biomass charcoal from potamogeton crispus and application thereof. The method comprises the following steps: 1, cleaning, drying and smashing potamogeton crispus and putting into a crucible, compacting potamogeton crispus powder to fill the crucible, covering the crucible with a crucible cover, and then using aluminum-foil paper for wrappingand sealing the crucible; putting the wrapped crucible into a muffle furnace, carrying out constant-temperature pyrolysis at 300-500 DEG C for 1 hour, and carrying out post-treatment to obtain potamogeton crispus biomass charcoal; 2, putting the potamogeton crispus biomass charcoal into a suction flask, connecting one end of the potamogeton crispus biomass charcoal into a vacuum pump, connecting the other end of the potamogeton crispus biomass charcoal into a beaker filled with a Fe < 3 + > solution, starting a vacuum pump to pump out air in pores of potamogeton crispus biomass charcoal powder, and closing the vacuum pump to suck the Fe < 3 + > solution into the suction flask; transferring the mixture in the suction flask into a three-neck flask, and adding a Fe < 2 + > solution; and carrying out constant-temperature magnetic stirring under a nitrogen condition, dropwise adding an alkaline solution until the pH value is equal to 10-11, and reacting to obtain the magnetic potamogeton crispus biomass charcoal. The method has the advantages of energy conservation, environmental protection, better environmental benefit and economic benefit and the like.

Description

technical field [0001] The invention belongs to the field of water treatment, and relates to a magnetic biomass charcoal, in particular to a method for preparing magnetic biomass charcoal from a weed grass and its application. Background technique [0002] Smilax, also known as shrimp algae, shrimp grass, and wheat yellow grass, is a submerged herbaceous plant in the genus Sclerophyllaceae. Scutellaria has wide adaptability and strong pollution resistance. It is often found in natural water bodies such as ponds, lakes, and streams, and grows in large quantities. Smilax grass grows in winter and spring, and if it is not harvested in time in summer, nitrogen and phosphorus will be released into the water body after the plants gradually rot, causing secondary pollution of the water body. [0003] Biochar refers to a kind of refractory, stable, highly aromatic and carbon-rich solid material produced by pyrolysis of biomass at high temperature (usually <700°C) under anoxic or...

AI Technical Summary

Problems solved by technology

[0005] The particle diameter of biochar is small, and it is difficult to separate it from water after wastewater treatment, which is not conducive to its regeneration and reuse; while the biochar pellets prepared after immobilization treatment with sodium alginate solution or polyvinyl alcohol solution are harmful to water bodies. The removal effect of pollutants is reduced, and the granular carbon will fall off after long-term use

This limits the practical application of biochar

At present, the biochar after wastewater treatment is mostly separated by filtration or centrifugation, but it takes a long time and the operation is relatively complicated; and using a specific method to magnetize the biochar, after the polluted water is treated, Using a low-intensity external magnetic field to separate and recover biochar from water is simpler and more efficient than methods such as filtration and centrifugation

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