| Using rice straw as raw material, biochar is prepared at four temperatures(300 ℃~600 ℃), characterized by Boehm titration, specific surface area and other methods. And four kinds of the adsorption characteristics of biochar on Norfloxacin are researched. Results show that with the increase of pyrolysis temperature, biochar productivity decline, the number of surface alkaline functional groups and specific surface area increased gradually. Four kinds of adsorption rate of biochar on Norfloxacin is B600>B500>B400>B300, when the dosage is 0. 4g, the adsorption rate of B600 and B500 is close to 100%, far higher than that of B400 and B300. To fit the adsorption isotherm of 4 kinds of biochar on Norfloxacin, B600 conforms to Langmuir equation, and the other three kinds conform to Freundlich equation. The adsorption process of 4 kinds of biochar on norfloxacin satisfies the pseudo-second order equation, correlation coefficient R2 is above 0. 9887, and the adsorption rate of B300 on Norfloxacin is maximum. |