Preparation method of high-porosity biochar and application of high-porosity biochar in degradation of organic wastewater

The invention discloses a preparation method of high-porosity biochar, which comprises the following steps: preheating biochar at 80-90 DEG C for 10-20 minutes, cooling to 40 DEG C at a rate of 1-3 DEG C/min, and carrying out heat preservation treatment; and then placing in 3-5 times of hydrochloric acid solution with the mass fraction of 5-10% for multi-stage stirring treatment, after stirring is finished, washing with water for 2-3 times, and drying. The bentonite is subjected to heat treatment, constant-temperature cooling and stirring in the regulator for matching modification, the bentonite has an interlayer spacing structure, and through heat treatment, constant-temperature cooling and lamellar spacing expansion, the space accommodation degree is improved, the adsorption effect is enhanced, and the adsorption effect of organic wastewater is enhanced through synergistic interaction with the biochar; the optimized and modified modification treatment liquid can be further synergized with the synergistic ad