Method for preparing biochar bimetallic catalyst and lignin fluorescent carbon dots through straw grading and water treatment application of biochar bimetallic catalyst and lignin fluorescent carbon dots

Abstract

The invention discloses a method for preparing a biochar bimetallic catalyst and lignin fluorescent carbon dots through straw grading and water treatment application of the biochar bimetallic catalyst and the lignin fluorescent carbon dots. The method comprises the following steps: based on multi-stage development and utilization of straws, carrying out lignin removal treatment on straw powder by taking choline chloride and lactic acid as a deep-eutectic solvent to respectively obtain straw residues and a lignin-deep-eutectic solvent mixed solution; the straw residues are added into a precursor solution composed of ferric chloride and magnesium chloride to form coprecipitation, and a solid A is obtained; pyrolyzing the solid A to obtain a biochar-loaded iron-magnesium bimetallic oxide catalyst; mixing the lignin-eutectic solvent mixed solution with an acetone aqueous solution, removing most lignin, concentrating to obtain a concentrated lignin-eutectic solvent, and performing hydrothermal reaction to obtain a lignin-based carbon dot solution. The catalyst and the fluorescent carbon quantum dot solution for high-price conversion of water body pollution treatment are fully utilized by the waste straws, the comprehensive utilization rate of the straws is improved, and the method is applied to drug pollutant treatment and heavy metal ion sensing of complex water bodies and has remarkable resource and environment values.

Description

technical field [0001] The invention relates to the technical field of biomass materials and water treatment, more specifically, to a method for preparing biochar bimetallic catalysts and lignin fluorescent carbon dots by graded straw and its water treatment application. Background technique [0002] Straw is a carbon-containing organic macromolecular functional body. It is a lignocellulosic resource with a natural porous structure formed by cross-linking cellulose, hemicellulose and lignin. The annual output exceeds 90% of the total biomass in the world. It not only has a wide range of sources and is cheap, it is the only green renewable resource that can participate in transportation and storage, and has huge energy potential. However, at this stage, most straw resources in my country are used in the form of direct combustion, which not only has low energy utilization efficiency and low grade, but also causes pollution to the environment. Therefore, the national "14th Fiv...

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Problems solved by technology

[0003] In recent years, with the continuous development and improvement of water pollution treatment technology, industrial dyes, pharmaceutical wastewater, heavy metal ions and other pollutants are messy and complex. Degradation of various organic pollutants, there are many problems such as poor stability, difficult to recycle, high energy consumption, high cost, etc.

In addition to the degradation of general organic pollutants, the pollution of heavy metal ions in water is also very serious. At present, precipitation and adsorption methods are mainly used for recovery, but the monitoring of metal ion concentration in residual waste liquid is relatively scarce.

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