水稻秸秆生物炭对诺氟沙星的吸附性能研究

Study on Adsorption Properties of Rice Straw Biochar on Norfloxacin

以水稻秸秆为原料,在300℃、400℃、500℃和600℃4个温度下制备生物炭,分别利用Boehm滴定、比表面积等方法对其进行表征,并研究了4种生物炭对诺氟沙星的吸附特征。结果表明,随着热解温度的升高,生物炭产率下降,表面碱性官能团数量和比表面积逐渐增加。4种生物炭对诺氟沙星的吸附率为B600>B500>B400>B300,在投加量为0.4 g时,B600和B500的吸附率几乎接近100%,远高于B400和B300。对4种生物炭对诺氟沙星的吸附等温线进行拟合,B600符合Langmuir方程,其余3种符合Freundlich方程。4种生物炭对诺氟沙星的吸附反应过程满足准二级动力学方程,相关系数R2>0.9887,其中B300对诺氟沙星的吸附速率最大。

Using rice straw as raw material, biochar is prepared at four temperatures （300 ℃- 600℃ ） , characterized by Boe- hm 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 〉 11400 〉 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 bioehar 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