氮掺杂生物炭对水中四环素的吸附机理  

Study on the adsorption mechanism of tetracycline in water by nitrogen-doped biochar

作　　者：杜楠楠 兰星 杜晴 张静 牛慧斌 黄应平[2] 方艳芬 DU Nannan;LAN Xing;DU Qing;ZHANG Jing;NIU Huibin;HUANG Yingping;FANG Yanfen(College of Materials and Chemical Engineering,China Three Gorges University,Yichang,443002,China;College of Hydraulic and Environmental Engineering,China Three Gorges University,Yichang,443002,China)

机构地区：[1]三峡大学材料与化工学院,宜昌443002 [2]三峡大学水利与环境学院,宜昌443002

出　　处：《环境化学》2025年第3期820-830,共11页Environmental Chemistry

基　　金：国家自然科学基金(22376118,22076098,21577078);地方高校能源和环境材料化学学科创新引智基地(D20015);湖北省自然科学基金杰出青年项目(2023AFA054)资助.

摘　　要：如何通过增加表面活性位点数目来提高生物炭对有机污染物的吸附性能,是目前污染控制技术的研究热点.通过一步热解法制备的氮掺杂分层多孔生物炭(BC-N)材料,可用于高效吸附去除水中四环素(Tetracycline,TC).结果表明,与原始生物炭(BC)相比,含N官能团的引入使BC-N的比表面积和孔体积增加了约1倍,对TC的吸附量增加了15倍(293.1 mg·g^(-1)).BC-N具有宽pH适应性(pH 4—11)和抗干扰能力.由吸附动力学和热力学实验得到,BC-N对TC的吸附过程符合拟二级动力学和Freundlich吸附等温线模型,表明该吸附过程以自发吸热的化学吸附为主.X射线光电子能谱(XPS)和傅里叶变换红外光谱(FTIR)结果表明,BC-N与TC的化学吸附可能主要是由石墨N介导的π-π相互作用产生.How to improve the adsorption performance of biochar to organic pollutants by increasing surface active sites is the research hotspot of pollution control technology.Nitrogen-doped layered porous biochar(BC-N)was prepared by one-step pyrolysis for adsorption and removal tetracycline(TC)from water.The results showed that the introduction of nitrogen-containing functional groups increased the specific surface area and pore volume of BC-N by about 1 times,and the adsorption capacity of TC increased by 15 times(293.1 mg·g^(-1)),compared with the pristine biochar(BC).BC-N has wide pH adaptability(pH 4—11)and anti-interference capability.According to the adsorption kinetics and thermodynamics experiments,the adsorption process of BC-N on TC is the quasi-second-order kinetics and Freundlich adsorption isotherm model,which indicates that the adsorption process is dominated by spontaneous endothermic chemisorption.X-ray photoelectron spectroscopy(XPS)and Fourier transform infrared spectroscopy(FTIR)also shown that the chemisorption between BC-N and TC may be mainly due to theπ-πinteraction mediated by graphitic nitrogen.

关 键 词：生物炭 氮掺杂 四环素 吸附量 吸附机理. 

分 类 号：X-1[环境科学与工程] O6[理学—化学]