摘要
不添加任何表面活性剂,以碱式碳酸铈(Ce(OH)CO_(3))纳米棒为前驱体,通过改变固-液界面反应时间合成端口结构不同的氧化铈(CeO_(2))纳米管。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和氮吸附(BET)等手段对其物化性质表征,并探讨了CeO_(2)纳米管的形成机理。重点对比研究了不同端口结构的CeO_(2)纳米管对甲基橙的吸附性能。结果表明:端口开放型CeO_(2)纳米管比表面积为65.536 m^(2)·g^(-1),高于端口闭合型CeO_(2)纳米管的比表面积(29.672 m^(2)·g^(-1))。其次,CeO_(2)纳米管端口开放能有效改善其对甲基橙的吸附效果。吸附量随着甲基橙初始浓度增加而逐渐增大。在20 mg·L^(-1)的甲基橙溶液中吸附时间为60 min时基本达到吸附平衡,最大吸附量为35 mg·g^(-1),明显高于端口闭合型CeO_(2)纳米管的吸附量。这主要归因于端口开放型CeO_(2)纳米管的独特端口结构、较大的比表面积以及与甲基橙分子的静电相互作用。同时,研究了两种类型CeO_(2)纳米管对甲基橙吸附过程的动力学,均很好地符合准二级动力学模型,说明物理吸附和化学吸附共存在。还讨论了其吸附机理。这将为染料废水处理选择有效的吸附材料提供参考和新的途径。
Two types of cerium oxide nanotubes(CeO_(2)-NT)were synthesized by means of a solid-liquid interface chemical reaction using Ce(OH)CO_(3)nanorods as precursors in the absence of any surfactants.Cerium oxide nanotubes with different end structures can be obtained by just simply adjusting the reaction times.X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and N_(2)adsorption-desorption isotherm(BET)were used to characterize the physical and chemical properties of as-synthesized precursor and cerium oxide nanotubes.Meanwhile,the formation mechanism for CeO_(2)nanotubes was discussed.A comparative study was conducted on the adsorption properties of CeO_(2)nanotubes with different end structures for methyl orange(MO).The results show that the specific surface area of CeO_(2)nanotubes with nanotubular open-ended structureis 65.536 m^(2)·g^(-1).It is much higher than that of CeO_(2)nanotubes with nanotubular closed-ended structure(29.672 m^(2)·g^(-1)).Also,the results show that CeO_(2)nanotubes with nanotubularopen-ended structure can effectively improve the adsorption effect of methyl orange.An increase in the initial concentration of methyl orange significantly enhances the adsorption capacity.When the adsorption time is 60 min,the adsorption equilibrium is basically reached in 20 mg·L^(-1)methyl orange solution,and the maximum adsorption capacity is 35 mg·g^(-1),which is significantly higher than that of CeO_(2)nanotubes with nanotubular closed-ended structure.The superior adsorption performance may be mainly attributed to the peculiar end structure,the larger specific surface area and the presence of electrostatic interactions between CeO_(2)nanotubes surface and MO molecules.The adsorption process followsthe pseudo-second-order kinetic model,indicating the coexistence of chemisorption and physisorption.The mechanism of MO adsorption is also discussed.This finding will provide new avenues for using promising adsorbent materials for dye removal in water treatments.
作者
李雪萍
雷丽婷
黄馨莹
袁爱群
鲍佳宁
Li Xueping;Lei Liting;Huang Xinying;Yuan Aiqun;Bao Jianing(School of Chemistry and Chemical Engineering,Guangxi Minzu University,Key Laboratory of Chemistry and Engineering of Forest Products,State Ethnic Affairs Commission,Guangxi Key Laboratory of Chemistry and Engineering of Forest Products,Engineering Research Center of Low-carbon and High-quality Utilization of Forest Biomass,University of Guamgxi,Nanning 530006,China)
出处
《中国稀土学报》
北大核心
2025年第4期842-852,共11页
Journal of the Chinese Society of Rare Earths
基金
广西科技计划项目-广西科技基地和人才专项项目(桂科AD21220007)
广西民族大学人才引进科研启动项目(2018KJQD12)
广西自然科学基金青年科学基金项目(2020GXNSFBA159017)
广西高等教育本科教学改革工程项目(2023JGA166)
国家级大学生创新训练计划项目(202310608032,202410608022)
广西自治区级大学生创新训练计划项目(S202410608095,S202410608093)资助。
关键词
氧化铈
纳米管
合成
甲基橙
吸附
cerium oxide
nanotubes
synthesis
methyl orange
adsorption
