氮掺杂改性生物炭对四环素的吸附特性研究  

Adsorption characterization ofnitrogen-doped modified biochar on tetracycline

作　　者：郭俊灵 谢泽昕 陈涛 唐碧超 林泽帅 胡湛波 GUO Junling;XIE Zexin;CHEN Tao;TANG Bichao;LIN Zeshuai;HU Zhanbo(School of Resources Environment and Materials,Guangxi University,Nanning 530004,China;Key Laboratory of Environmental Protection(Guangxi University),Education Department ofGuangxi Zhuang Autonomous Region,Nanning 530004,China;Guangxi Yijiang Environmental Protection Technology Co.,Nanning 530007,China)

机构地区：[1]广西大学资源环境与材料学院,南宁530004 [2]广西高校环境保护重点实验室,南宁530004 [3]广西益江环保科技股份有限公司,南宁530007

出　　处：《功能材料》2025年第4期4147-4155,共9页Journal of Functional Materials

基　　金：广西重点研发计划(桂科AB23075113);南宁市创新创业领军人才“邕江计划”资助项目(2022015);南方石山地区矿山地质环境修复工程技术创新中心开放课题(NFSS2023026)。

摘　　要：为了高效吸附去除水中的四环素(TC),以玉米秸秆为原料、三聚氰胺为氮源,在不同热解温度下制备了一系列氮掺杂生物炭,并探究氮掺杂改性对生物炭吸附TC的影响及其作用机制。结果表明,相较于原始的生物炭,氮掺杂改性生物炭对TC的吸附性能提升2.18~2.78倍。其中,900NBC的吸附性能最好,在25℃时最大吸附量为194.4 mg/g,并且900NBC在pH为3.0~11.0时,对TC去除率始终保持在80%以上,在较宽的pH范围内具有良好的吸附效果。此外,900NBC对TC的吸附过程符合拟二级动力学模型,表明化学吸附占主导地位;Langmuir和Freundlich模型均可较好地拟合吸附等温线,热力学结果表明吸附过程是自发和吸热过程。另外,900NBC在5次吸附-解吸循环后仍保持较高的TC去除率。最后,吸附机制分析表明900NBC对TC的吸附机制主要包括孔隙填充、氢键作用、π-π相互作用和静电作用。研究结果可为TC废水处理提供一种高效的吸附剂。In order to efficiently adsorb and remove tetracycline(TC)from water,this paper prepared a series of nitrogen-doped biochars at different pyrolysis temperatures using corn stover as the raw material and melamine as the nitrogen source,and investigated the effect of nitrogen-doped modification on the adsorption of TC by the biochars and the mechanism of action.The results showed that nitrogen-doped modified biochar exhibited an enhanced adsorption capacity for TC by 2.18-2.78 times compared to the original biochar.Among them,900NBC showed the best adsorption performance with a maximum adsorption capacity of 194.4 mg/g at 25℃.Furthermore,900NBC maintained a TC removal rate above 80%in the pH range of 3.0-11.0,indicating excellent adsorption performance over a wide pH range.In addition,the adsorption process of TC onto 900NBC followed a pseudo-second-order kinetic model,suggesting the dominance of chemical adsorption.Both the Langmuir and Freundlich models successfully fitted the adsorption isotherms,and the thermodynamic results indicated that the adsorption process was spontaneous and endothermic.Moreover,900NBC maintained a high TC removal rate after 5 cycles of adsorption-desorption.Finally,the analysis of the adsorption mechanism revealed that the adsorption of TC onto 900NBC was mainly attributed to pore filling,hydrogen bonding,π-πinteractions,and electrostatic interactions.The results of this study may provide an efficient adsorbent for tetracycline wastewater treatment.

关 键 词：氮掺杂改性 生物炭 抗生素 四环素 吸附剂 

分 类 号：X703[环境科学与工程—环境工程]