School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan 243032, China.
School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan 243032, China; Engineering Research Center of Biofilm Water Purification and Utilization Technology of Ministry of Education, Anhui University of Technology, Ma'anshan 243032, China.
Bioresour Technol. 2021 Jun;330:124949. doi: 10.1016/j.biortech.2021.124949. Epub 2021 Mar 11.
NaHCO was used as a novel activator to produce cassava ethanol sludge-based biochar. The NaHCO-activated biochar showed superior adsorption capacity for tetracycline (154.45 mg/g) than raw biochar (34.04 mg/g). Orthogonal experiments confirmed the optimal preparation conditions of biochar. Increasing adsorbent dosage and temperature facilitated tetracycline removal. The maximum removal was 92.60% at pH = 3.0. Calcium ions and alkalinity decreased tetracycline removal. The time for attaining equilibrium was extended with increasing tetracycline concentration, but the equilibrium could be completed within 24 h. Langmuir model fitted the equilibrium data well. Kinetics process followed the Elovich model. The adsorption rate was controlled by both intraparticle and liquid film diffusion and the process was endothermic and spontaneous. The electrostatic attraction, hydrogen bonding, π-π interactions, and pore-filling were involved in the adsorption mechanism. The findings may provide an underlying guide for sludge disposal and removal of tetracycline from wastewater in practical application.
NaHCO₃被用作一种新型的激活剂来制备木薯乙醇污泥基生物炭。与原生物炭（34.04 mg/g）相比，NaHCO₃激活的生物炭对四环素（154.45 mg/g）具有更高的吸附能力。正交实验证实了生物炭的最佳制备条件。增加吸附剂用量和温度有利于四环素的去除。在 pH = 3.0 时，去除率最高可达 92.60%。钙离子和碱度降低了四环素的去除率。随着四环素浓度的增加，达到平衡的时间延长，但在 24 h 内可以完成平衡。Langmuir 模型很好地拟合了平衡数据。动力学过程遵循 Elovich 模型。吸附速率受颗粒内扩散和液膜扩散的控制，该过程是吸热和自发的。静电吸引、氢键、π-π相互作用和孔填充参与了吸附机制。研究结果可为实际应用中污泥处理和废水中四环素去除提供理论依据。
