改性稻壳生物炭对水中金霉素和土霉素的吸附特征  

Adsorption of Chlortetracycline and Oxytetracycline to Modified Rice Husk

作　　者：宋红柚 许中坚[1,2] 梅华贤 SONG Hongyou;XU Zhongjian;MEI Huaxian(School of Chemistry and Chemical Engineering,Hunan University of Science and Technology,Xiangtan Hunan 411201,China;School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan Hunan 411201,China)

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201 [2]湖南科技大学资源环境与安全工程学院,湖南湘潭411201

出　　处：《地球与环境》2024年第5期641-651,共11页Earth and Environment

摘　　要：以稻壳生物炭(BC)为原料,采用KOH和KMnO_(4)进行改性,得到改性生物炭K-BC,Mn-BC和共改性生物炭K-Mn-BC。采用BET、SEM和FTIR等手段对其微观结构和组成进行表征,通过初始浓度、pH和温度等单因素实验研究改性前后生物炭对盐酸金霉素(CTC)、盐酸土霉素(OTC)的吸附行为和去除率影响。结果表明,KOH活化会制造更多的炭结构缺陷,比表面积和孔体积可达685.99m^(2)/g和0.34cm^(3)/g,较原始生物炭提高了1倍以上。准二级动力学和Freundlich模型可以较好地拟合生物炭吸附CTC和OTC的过程。热力学分析表明,稻壳生物炭对CTC、OTC的吸附是一个自发的吸热过程。溶液pH、二价阳离子对吸附影响比较大;稻壳生物炭吸附水中CTC、OTC主要是通过氢键作用、静电作用及π-π堆积作用。K-BC吸附效果较BC显著提高,且环境适应性更强,对水中CTC、OTC的去除具有较大的应用潜力。Rice husk biochar(BC)was modified using KOH and KMnO_(4) to obtain modified biochars K-BC,Mn-BC and co-modified biochar K-Mn-BC.The microstructure and composition of the modified biochar were characterized using SEM,FTIR and BET.Singlefactor experiments were conducted to study the effect of biochar modification on the adsorption behavior and removal efficiency of chlortetracycline(CTC)and oxytetracycline(OTC)by biochar before and after modification at different initial concentrations,pH values,and temperatures.The results show that the activation of KOH can produce more carbon structural defects,increasing the specific surface area and pore volume up to 685.99 m^(2)/g and 0.34 cm^(3)/g,respectively,more than double that of the original biochar.The pseudo-secondorder kinetics and Freundlich model can well describe the process of adsorption of CTC and OTC to biochar.Thermodynamic analysis shows that the adsorption of CTC and OTC by rice husk biochar was a spontaneous endothermic process.Solution pH and divalent cations had great influence on the adsorption.Rice husk biochar adsorbed CTC and OTC in water mainly through hydrogen bonding,electrostatic interaction andπ-πstacking.The adsorption capacity of K-BC was significantly higher than that of BC,with stronger environmental adaptability,indicating great potential to remove CTC and OTC from water.

关 键 词：改性稻壳生物炭 金霉素 土霉素 吸附机制 

分 类 号：X703[环境科学与工程—环境工程]