Zhao Xinyu, Zhu Guokai, Liu Jiangtao, Wang Jieni, Zhang Shuqin, Wei Chenlin, Cao Leichang, Zhao Shuguang, Zhang Shicheng
Miami College, Henan University, Kaifeng 475004, China.
College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475004, China.
Nanomaterials (Basel). 2024 Aug 23;14(17):1377. doi: 10.3390/nano14171377.
The disposal and treatment of antibiotic residues is a recognized challenge due to the huge production, high moisture content, high processing costs, and residual antibiotics, which caused environmental pollution. Antibiotic residues contained valuable components and could be recycled. Using a one-step controllable pyrolysis technique in a tubular furnace, biochar (OSOBs) was produced without the preliminary carbonization step, which was innovative and time- and cost-saving compared to traditional methods. The main aim of this study was to explore the adsorption and removal efficiency of tetracycline (TC) in water using porous biochar prepared from oxytetracycline fermentation residues in one step. A series of characterizations were conducted on the prepared biochar materials, and the effects of biochar dosage, initial tetracycline concentration, reaction time, and reaction temperature on the adsorption capacity were studied. The experimental results showed that at 298 K, the maximum adsorption capacity of OSOB-3-700 calculated by the Langmuir model reached 1096.871 mg/g. The adsorption kinetics fitting results indicated that the adsorption of tetracycline on biochar was more consistent with the pseudo-second-order kinetic model, which was a chemical adsorption. The adsorption isotherm fitting results showed that the Langmuir model better described the adsorption process of tetracycline on biochar, indicating that tetracycline was adsorbed in a monolayer on specific homogeneous active sites through chemical adsorption, consistent with the kinetic conclusions. The adsorption process occurred on the surface of the biochar containing rich active sites, and the chemical actions such as electron exchange promoted the adsorption process.
抗生素残留的处置和处理是一项公认的挑战，因为其产量巨大、含水量高、处理成本高，且残留抗生素会造成环境污染。抗生素残留含有有价值的成分，可以回收利用。在管式炉中采用一步可控热解技术，无需初步碳化步骤即可制备生物炭（OSOBs），与传统方法相比，这具有创新性且节省时间和成本。本研究的主要目的是探索一步法由土霉素发酵残渣制备的多孔生物炭对水中四环素（TC）的吸附和去除效率。对制备的生物炭材料进行了一系列表征，并研究了生物炭用量、四环素初始浓度、反应时间和反应温度对吸附容量的影响。实验结果表明，在298K时，通过朗缪尔模型计算的OSOB-3-700的最大吸附容量达到1096.871mg/g。吸附动力学拟合结果表明，四环素在生物炭上的吸附更符合准二级动力学模型，这是一种化学吸附。吸附等温线拟合结果表明，朗缪尔模型能更好地描述四环素在生物炭上的吸附过程，表明四环素通过化学吸附在特定的均匀活性位点上以单层形式吸附，与动力学结论一致。吸附过程发生在含有丰富活性位点的生物炭表面，电子交换等化学作用促进了吸附过程。
