High-adsorption performance biochar for heavy metal ions and preparation method for high-adsorption-performance biochar

Abstract

The invention discloses a high-adsorption performance biochar for heavy metal ions. The high-adsorption performance biochar is prepared by using sorghum residues, rice residues, glutinous rice residues, wheat residues and corn residues which are obtained after wine is brewed as raw materials and performing anaerobic pyrolysis; the high-adsorption performance biochar is characterized by being prepared by uniformly mixing the sorghum residues, the rice residues, the glutinous rice residues, the wheat residues and the corn residues which are crushed to a certain particle size in a certain mass ratio; adding a suitable amount of a rubidium chloride solution with an appropriate concentration; sealing and standing for 12 hours; performing high-temperature anaerobic pyrolysis on a mixture after the solution is dried naturally; soaking the mixture which is subjected to the high-temperature anaerobic pyrolysis by utilizing a mixed solution of HCl / HF; washing the mixture to neutral by utilizing distilled water. According to the biochar prepared by the preparation method, the content of lead, chromium, zinc and copper in water can be effectively reduced; the highest removal rates of the lead, the chromium, the zinc and the copper in the water can reach 99.2 percent, 85.3 percent, 82.9 percent and 85.9 percent.

Description

technical field [0001] The invention relates to a method for treating polluted environment, in particular to a method for preparing biochar with high adsorption performance for heavy metal ions. Background technique [0002] With the rapid development of industry, various industrial (such as smelting, electroplating, mining, etc.) wastewater and solid waste leachate are directly discharged into the water body, resulting in higher and higher heavy metal content in the water body. Heavy metals are not naturally degradable or biodegradable like organic compounds. They are often dissolved in water bodies or deposited at the bottom of water bodies, or absorbed by aquatic plants (phytoplankton, emergent plants), and accumulate through the food chain to damage animal and human health. Therefore, it is urgent to purify the heavy metals in wastewater. [0003] Using activated carbon to adsorb heavy metal wastewater has the advantages of simple treatment method and high adsorption ...

AI Technical Summary

Problems solved by technology

At present, there are many researches on the preparation of biochar from organic materials at home and abroad, such as Zhang Jiyi from Lanzhou University of Technology and others using wheat straw to prepare biochar, Zhejiang University Chen Zaiming from rice straw to prepare biochar, Beijing University of Science and Technology Zhang Yang to prepare biochar from corncobs, etc. However, most of the existing researches use a single raw material to prepare biochar, while there are few studies on the preparation of biochar from mixed materials, especially the lack of targeted optimization of various biomass raw materials to prepare biochar with high adsorption performance for heavy metal ions. bio-charcoal