Repairing material for emergency treatment of black and odorous surface water environment and its preparation method

A preparation method, comprising the following steps:

• (1) uniformly stirring activated carbon, calcium chloride, ammonia water solution, polyethylene glycol and water in a stirrer, then dropwise adding hydrogen peroxide solution with stirring, and after the completion of the dropwise adding, obtaining a calcium peroxide solution;
• (2) adding a sodium hydroxide solution to the calcium peroxide solution obtained in step (1) until a pH reaches 11.5, thereby obtaining a suspension;
• (3) centrifuging the suspension in step (2) to obtain a precipitate;
• and
• (4) washing the precipitate in step (3) with distilled water until a final pH of residual water reaches 8.4, and then drying the obtained precipitate to obtain a dried precipitate;
• wherein in step (1), the activated carbon is pretreated by the following steps:
• soaking activated carbon in 0.5-1.5 mol·L−1 hydrochloric acid solution for 1.5-2.5 hours, repeatedly washing the activated carbon with deionized water until the residual water is neutral, soaking the activated carbon in 0.5-1.5 mol·L−1 sodium hydroxide solution for 1.5-2.5 hour, repeatedly washing the activated carbon with deionized water until the residual water is neutral such that impurities are removed, drying the activated carbon in an oven at 105° C., grinding the activated carbon to obtain powered activated carbon, and passing the powdered activated carbon through a 200-mesh sieve.