Preparation method of modified biochar sulfur-fixing material and application of modified biochar sulfur-fixing material in adsorbing sulfur dioxide in flue gas

Abstract

This invention relates to a method for preparing modified biochar sulfur-fixing materials and their application in adsorbing sulfur dioxide from flue gas. The purpose of this invention is to address the problem of low efficiency in the absorption of sulfur dioxide by existing activated carbon. The method involves an alkaline leaching preparation: 1. Saccharification treatment by adding concentrated sulfuric acid to straw powder to obtain black, lumpy saccharified material; 2. Calcination and carbonization treatment; 3. Immersion of biochar in NaOH solution to obtain alkaline-modified biochar; 4. Grinding the alkaline-modified biochar in a mortar with potassium permanganate powder. This invention also relates to a method for preparing ultraviolet magnetic modified biochar sulfur-fixing materials, which involves irradiating biochar under ultraviolet light, then mixing the ultraviolet-modified biochar with iron tetroxide, and finally calcining it in a furnace. The preparation methods of these two modified biochar sulfur-fixing materials are simple and reliable, using readily available straw raw materials, realizing the utilization of straw waste, and improving the adsorption rate of sulfur dioxide in flue gas.

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