丹参残渣生物炭对四环素的吸附特征

Adsorption Characteristics of Tetracycline on Biochar from Salvia Miltiorrhiza

利用蒸馏水、乙醇和二氯甲烷提取丹参有效成分后的残渣为原始材料,利用限氧煅烧法制备三种生物炭,评价其对四环素的吸附特征。实验结果表明:当溶液的pH值为6.0、吸附剂投加量为0.3 g、反应时间为120 min时,WSC、ESC、DSC对10 mg/L四环素废水的最大去除率分别为53.56%,55.16%和58.06%。准二级动力学方程能对吸附动力学实验数据进行较好拟合,表明该吸附以化学吸附为主。Freundlich方程能对等温吸附实验数据进行较好拟合,表明WSC、ESC、DSC对四环素的吸附以多分子层吸附为主,其实测最大吸附量分别为48.29,54.69和57.53 mg/g。

Three biochar were prepared by calcination with limited oxygen from salvia miltiorrhiza residue deal with by distilled water,ethyl alcohol and dichloromethane. Its adsorption characteristics for tetracycline was evaluated. The results indicated that when the solution pH value was 6.0,adsorbent dosage was 0.3 g,reaction time was 120 min,the maximum removal rate of WSC,ESC and DSC for tetracycline wastewater was 53.56%,55.16% and 58.06%,respectively.Pseudo-second kinetic equation can fit the kinetic experimental data,indicating the adsorption process of tetracycline on the surface of WSC,ESC and DSC was mainly chemical adsorption. Freundlich equation can fit the thermal adsorption data, indicating the adsorption process was multi-monolayer adsorption,and the maximum measured adsorption capacity of WSC,ESC and DSC for tetracycline was 48.29,54.69and 57.53 mg/g,respectively.