牡丹果荚基多孔碳材料对水中四环素的吸附
Adsorption of tetracycline in water by peony pod-based porous carbon material
何红珠 1王欣怡 1卫潇 1王凤杰 1刘欣妮 1杨钰钰 1罗莎 1Ilhem Kerboua1
作者信息
- 1. 长安大学水利与环境学院,西安 710054;旱区地下水文与生态效应教育部重点实验室,西安 710054;水利部旱区生态水文与水安全重点实验室,西安 710054
- 折叠
摘要
为解决牡丹果荚废弃物焚烧处理造成的环境污染及资源浪费问题,并进一步实现废弃物资源化利用,本文以生物质废弃物牡丹果荚为碳源,KHCO3为活化剂,且牡丹果荚与活化剂质量比为1∶3,经一步活化法800℃煅烧2h制备出孔结构发达的牡丹果荚基多孔碳(PC-800-3)材料吸附水中四环素.通过调控活化温度、牡丹果荚/KHCO3质量比,得到的最佳产物PC-800-3较直接热解的牡丹果荚基多孔碳(PC)比表面积增加60倍,298 K下对100 mg·L-1 四环素溶液的最大吸附量为394.3 mg∙g-1.通过比表面积孔径分析、扫描电子显微镜、傅里叶变换红外光谱、X射线衍射等对PC与PC-800-3进行表征,结果显示活化剂的加入促进了多孔碳中微孔与介孔的生成.选择PC-800-3进行后续吸附实验,吸附等温线和吸附动力学拟合结果表明吸附过程符合Langmuir等温模型和拟二级动力学模型,热力学实验证实吸附为自发吸热过程,以单分子层物理吸附为主,存在静电相互作用.所制备的PC-800-3材料在较宽pH范围内和离子干扰下的吸附性能良好.再生实验表明,PC-800-3具有良好的重复利用性能.因此,将牡丹果荚转化为多孔碳制备性能优异的吸附剂,在解决水环境中抗生素污染问题的同时拓宽了其应用范围,进一步实现了废弃生物质的资源化利用.
Abstract
To solve the problem of environmental pollution and resource waste caused by the incineration of peony pod waste,the possible transformation of this biomass to usable porous carbon was assessed.In this study,waste peony pods were the carbon source and KHCO3 the activator in a one-step activation process at 800℃,with an initial pod-to-activator mass ratio of 1∶3.The resulting pore-based carbon material had a well-developed pore structure,suitable for absorbing tetracycline in water.By adjusting the activation temperature and the mass ratio of peony pod to KHCO3,the optimal product PC-800-3 had a specific surface area 60 times higher than that of peony pod porous(PC)obtained by direct pyrolysis,and the maximum adsorption capacity for 100 mg·L-1 TC solution at 298 K was 394.3 mg∙g-1.The PC and PC-800-3 were characterized by specific surface area and pore size analysis,scanning electron microscopy,Fourier transform infrared spectroscopy,and X-ray diffraction.The results showed that the addition of activator promoted the formation of micropores and mesopores in the carbon material.PC-800-3 was selected for subsequent adsorption experiments.The fitting results of adsorption isotherm and adsorption kinetics showed that the adsorption process conformed to the Langmuir isotherm model and pseudo-second-order kinetics model.Thermodynamic experiments confirmed that the adsorption was a spontaneous endothermic process,mainly involving physical adsorption in the monolayer,with electrostatic interaction.The prepared PC-800-3 material exhibited good adsorption performance over a wide pH range and under ion interference.Regeneration experiments showed that PC-800-3 had good reusability.Therefore,converting peony pods into porous carbon to prepare high-performance adsorbents appears to not only solve the problem of antibiotic pollution in water,but also broaden the possible applications of this waste biomass.
关键词
牡丹果荚/多孔碳/四环素/吸附Key words
peony pod/porous carbon/tetracycline/adsorption引用本文复制引用
基金项目
国家自然科学基金青年科学基金(42207101)
国家自然科学基金国际(地区)合作与交流项目(42220104005)
中央高校基本科研业务费专项长安大学项目(300102293208)
陕西省教育厅服务地方专项(22JE08)
出版年
2024
国家科技期刊平台
NSTL
万方数据