牡蛎壳改性蓝藻生物炭对水中四环素的吸附性能  

Adsorption performance of tetracycline in water by cyanobacterial biochar modified with oyster shells

作　　者：梁耐思 曾悦 陈小丽 李进 LIANG Naisi;ZENG Yue;CHEN Xiaoli;LI Jin(School of Chemistry and Environment,Guangdong Ocean University,Zhanjiang,Guangdong 524088,China)

机构地区：[1]广东海洋大学化学与环境学院,广东湛江524088

出　　处：《福建农林大学学报(自然科学版)》2025年第2期238-249,共12页Journal of Fujian Agriculture and Forestry University:Natural Science Edition

基　　金：广东省科学技术厅-2020年广东省科技专项资金竞争性分配项目(2020A03019);2022年“冲补强”省财政专项(080503122202)。

摘　　要：【目的】通过制备牡蛎壳改性蓝藻生物炭(oyster shell-modified cyanobacterial biochar, CaBC)去除水体中的四环素(tetracycline, TC),探讨CaBC在水中的吸附性能,为水体抗生素污染治理提供依据。【方法】以蓝藻为原料,使用400℃煅烧的牡蛎壳作为钙源,通过水热合成法制备CaBC,用于去除水溶液中的TC。利用扫描电子显微镜、傅里叶变换红外光谱(FTIR)、X射线衍射(FTIR)及比表面积测定法对改性前后的生物炭进行表征分析。【结果】CaBC具有明显增多的表面官能团、更大的比表面积和孔体积及更小的粒径。FTIR和XRD表征结果表明,生物炭(biochar, BC)成功负载了牡蛎壳。与BC相比,CaBC去除率提高了22.8%。在TC初始质量浓度为80 mg·L^(-1)、CaBC投加量为1.25 g·L^(-1)、pH=9.0的条件下,CaBC对TC的去除率达到87.15%。Langmuir模型拟合结果表明,随着TC初始溶液浓度的增加,CaBC的吸附能力增强。动力学试验表明,CaBC对TC的吸附行为符合准二级动力学模型,表明吸附过程为单分子层的化学吸附。研究表明,CaBC通过孔隙填充、π-π相互作用及静电引力实现对TC的高效吸附。经过5次吸附—解吸循环后,去除率仍保持在51.83%,证明其具有较高的吸附效率和稳定性。【结论】CaBC在去除水体中的TC方面表现出优异的吸附性能,其高效性和稳定性显示了其在TC污染水体中的广阔应用前景。【Objective】The adsorption performance of oyster shell⁃modified cyanobacterial biochar(CaBC)in removing tetracycline(TC)pollution in water was evaluated to provide a basis for the abatement of antibiotic pollution in water bodies.【Method】CaBC was prepared by hydrothermal synthesis using cyanobacteria as the raw material and oyster shells calcined at 400℃as the calcium source for the removal of TC from aqueous solutions.The biochar was characterized and analyzed before and after modification by scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),X⁃ray diffraction(XRD)and specific sur⁃face area measurement.【Result】The modified CaBC had significantly more surface functional groups,larger specific surface area,pore volume and smaller particle size,and the initial biochar(BC)was successfully loaded with oyster shells by FTIR and XRD characterizations.The removal performance of modified CaBC was increased by 22.8%compared to BC,and the removal of TC by CaBC reached 87.15%at an initial TC concentration of 80 mg·L^(-1),a CaBC dosage of 1.25 g·L^(-1),and pH=9.0.Langmuir model fitting results showed that the adsorption capacity of CaBC was enhanced with the increased initial concentration of TC solution.Kinetic tests showed that the adsorption behavior of CaBC on TC was in accordance with the quasi⁃secondary kinetic model, indicatingthat the adsorption process was chemisorption in a monomolecular layer. It was further shown that CaBC realized the efficient adsorp⁃tion of TC through pore filling, π⁃π interaction and electrostatic attraction. After 5 adsorption⁃desorption cycles, the removal rate re⁃mained at 51.83%, which proved its high adsorption efficiency and stability. 【Conclusion】CaBC showed excellent adsorption per⁃formance in removing TC from water bodies, and its high efficiency and stability indicated its good application prospect in TC⁃pollu⁃ted water bodies.

关 键 词：蓝藻 生物炭 牡蛎壳 吸附 四环素 

分 类 号：X52[环境科学与工程—环境工程]