Preparation method for combined modified straw active particulate carbon adsorption material and use of same

A preparation method of a combined modified straw activated granular carbon adsorption material for phosphorus removal, comprising the following steps:

• 1) mixing 100 pbw straw powder, 50-150 pbw distilled water, 10-100 pbw binder, and 0-25 pbw composite mineral for granulation, to obtain straw composite granules;
• 2) Loading the straw composite granules in a tubular furnace and carrying out pyrolysis at 350-750° C. for 1-6h, and then cooling, to obtain straw granular carbon with a particle size of 0.5-6 mm for later use;
• 3) Charging an inert gas into a modification reagent, which are at least one of metallic magnesium ion solution, metallic aluminum ion solution, or metallic iron ion solution and adding an alkaline solution in drops till the pH is 8-11;
• carrying out ultrasonic treatment for 5-30 minutes, keeping in a still state at 35-60° C. for 30-80 minutes, and then adding ferric nitrate solution for reaction for 5-10 minutes, to obtain a combined modified solution for later use;
• 4) Loading the straw granular carbon obtained in the step 2) into the combined modified solution obtained in the step 3) and soaking for 30 minutes, carrying out ultrasonic treatment at 1-8 MPa for 1-12h, and then centrifuging;
• next, drying at 105±2° C., firing in a muffle furnace at 200° C. for 2-8h, taking out and washing with 0.1 mol/L hydrochloric acid solution and deionized water in alternate till the supernatant is neutral, and then drying, so as to obtain the combined modified straw activated granular carbon adsorption material.