Corncob-based biochar preparation method and system as well as mercury absorbent

Abstract

The invention discloses a corncob-based biochar preparation method and system as well as a mercury absorbent. The preparation method comprises the steps as follows: corncobs are washed with water, sheared and crushed, and corncob particles are obtained; the corncob particles are added to an aqueous solution containing stannous chloride and ferric trichloride to be impregnated for 3-4 h and then dried at 80-90 DEG C for 4-5 h, a mixture is obtained and heated to 350-450 DEG C in the presence of nitrogen in a muffle furnace at the speed of 8-10 DEG C / min for 5-6 h, and corncob biochar particlesare obtained; the corncob biochar particles are stirred in an ethylene glycol solution containing ferrous chloride, zinc chloride and selenium powder at 150-160 DEG C for 2-3 h in the presence of chlorine, an alkaline solution is added to adjust the pH value, then vacuum drying is performed at 40-50 DEG C for 6-7 h, corncob biochar is obtained, the corncob biochar, dimethyl formamide, mercaptoacetic acid and anhydrous sodium hydrogen sulfate are placed in a container to be stirred uniformly and then sealed, the mixture reacts at 120 DEG C for 3 h, the product is added to a 95% ethanol solutioncontaining sodium sulfide nonahydrate, and thiolated corncob biochar is obtained.

Description

Technical field [0001] The invention relates to the field of heavy metal treatment, in particular to a corncob-based biochar preparation method and preparation system, and a mercury absorbent. Background technique [0002] Modern industrial development and the improvement of human living standards have led to the continuous increase of heavy metal wastewater discharged into the environment, which comes from smelters, electroplating plants, mines, waste rock yards, steel plants, as well as medicine, paint, electrolysis, pesticides, pigments, etc. Industrial heavy metal wastewater has seriously affected human health and even life safety. Heavy metals are a class of toxic and harmful substances that cause water pollution, and a small amount of heavy metals can produce toxic effects. Heavy metal ions in wastewater can be absorbed and accumulated by organisms through the food chain or food web, and accumulate in the human body to chronic poisoning, thereby harming bones, brain, etc.,...

AI Technical Summary

Problems solved by technology

However, the straw material of this patent is not conducive to the formation of biochar with a large specific surface area, and the specific surface area and pore volume of biochar need to be improved

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