Liu Yanfang, Gao Wei, Yin Sijie, Liu Rui, Li Zaixing
School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, China.
Pollution Prevention Biotechnology Laboratory of Hebei Province, Shijiazhuang, China.
Front Chem. 2022 Dec 13;10:1078877. doi: 10.3389/fchem.2022.1078877. eCollection 2022.
In this study, biochar was prepared using penicillin fermentation residue (PR) as the raw material by different methods. The adsorption behavior and adsorption mechanism of biochar on tetracycline (TC) in an aqueous environment were investigated. The results showed that KCO as an activator could effectively make porous structures, and that biochar with mesoporous or microporous could be prepared in a controlled manner with two kinds of different activation methods, the dry mixing method and the impregnation method. The dry mixing method could create more mesopores, while the impregnation method could prepare more micropores. Microporous biochar (IKBCH) with a high specific surface area could be prepared by the impregnation method combined with HCl soaking, which has an excellent adsorption effect on tetracycline. When the concentration of tetracycline was 200 mg/L, the removal rate of 99.91% could be achieved with the dosage of microporous biochar at 1 g/L. The adsorption process was in accordance with the Langmuir model and the pseudo-second-order model, respectively. The maximum adsorption capacity of IKBCH was 268.55 mg/g (25°C). The adsorption mechanisms were pore filling, π-π interaction, electrostatic adsorption, and hydrogen bond. Its stable and wide applicability adsorption process does not cause ecological pollution in the aqueous environment, and it is a promising biochar adsorbent.
在本研究中，以青霉素发酵残渣（PR）为原料，采用不同方法制备生物炭。研究了生物炭在水环境中对四环素（TC）的吸附行为及吸附机理。结果表明，KCO作为活化剂可有效形成多孔结构，通过干混法和浸渍法两种不同活化方法可可控地制备具有中孔或微孔的生物炭。干混法可产生更多中孔，而浸渍法可制备更多微孔。通过浸渍法结合HCl浸泡可制备具有高比表面积的微孔生物炭（IKBCH），其对四环素具有优异的吸附效果。当四环素浓度为200 mg/L时，微孔生物炭投加量为1 g/L时去除率可达99.91%。吸附过程分别符合Langmuir模型和准二级模型。IKBCH的最大吸附容量为268.55 mg/g（25℃）。吸附机制为孔隙填充、π-π相互作用、静电吸附和氢键。其吸附过程稳定且适用性广，在水环境中不会造成生态污染，是一种很有前景的生物炭吸附剂。
