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Improved photocatalytic performance of acetaldehyde degradation via crystal plane regulation on truncated octahedral CeO_(2)
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作者 Bin Xu Lu Jia +6 位作者 Hui Yang Yue Wang Si-Yu Fan Sai-Sai Yuan Qi-TaoZhang Ming Zhang Teruhisa Ohno 《Rare Metals》 SCIE EI CAS CSCD 2024年第5期2026-2038,共13页
In this study,the truncated octahedral CeO_(2)(CeO_(2)-to)with special morphology was prepared by the solvothermal method with oleic acid(OA)and oleamine(OM)as the morphology-directing agents.High-resolution transmiss... In this study,the truncated octahedral CeO_(2)(CeO_(2)-to)with special morphology was prepared by the solvothermal method with oleic acid(OA)and oleamine(OM)as the morphology-directing agents.High-resolution transmission electron microscopy(HRTEM)results show that CeO_(2)-to exposes composite{100}and{111}facets,while CeO_(2)cubic(CeO_(2)-c)and CeO_(2)octahedral(CeO_(2)-o)only expose single crystal facets of{100}plane and{111}plane,respectively.Interestingly,this CeO_(2)-to photocatalyst exhibits remarkable photooxidation performance of gaseous acetaldehyde(CH_(3)CHO)degradation,in which CO_(2)generation value reaches 1.78 and 7.97-times greater than that of CeO_(2)-c and CeO_(2)-o,respectively.In addition,the active species trapping experiment signifies that superoxide(·O_(2)^(-))and holes(h^(+))are the main reactive substances during the CH_(3)CHO degradation process,and the electron paramagnetic resonance(EPR)spectra indicates that the former is the major contributor.Notably,the electron transfer mechanism between CeO_(2)-to{100}and{111}facets and the surface oxygen adsorption ability are revealed via density functional theory(DFT)calculations.It is also confirmed that{100}facets are more conducive to the absorption of acetaldehyde than{111}facets.Finally,a reasonable mechanism for improved photocatalytic CH_(3)CHO degradation on CeO_(2)-to is proposed based on relevant experiments and DFT calculations.This study demonstrates that the systematic development of surface homojunction structured photocatalysts can efficiently increase the degradation activity for volatile organic compounds(VOCs).It also offers additional direction for optimizing the photocatalytic activity of other ceriumbased photocatalysts. 展开更多
关键词 Truncated octahedral ceo_(2)(ceo_(2)-to) Composite crystal faces Surface energy level Efficient electrontransfer
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磁性石墨烯基负载CeO_(2)(magG/CeO_(2))应用于废水中亚甲基蓝的去除研究 被引量:7
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作者 王金兰 王廷媛 +3 位作者 王志敏 强玲芳 李胜霞 龙星宇 《贵州师范大学学报(自然科学版)》 CAS 2021年第4期63-69,共7页
首先通过溶剂热法制备Fe_(3)O_(4),再通过离子强度调控法将Fe_(3)O_(4)负载到二维氧化石墨烯(GO)片层结构上,形成Fe_(3)O_(4)/GO复合纳米材料(magG),再以共沉淀法制备Fe_(3)O_(4)/GO/CeO_(2)(magG/CeO_(2))复合纳米材料,并将其作为纳米... 首先通过溶剂热法制备Fe_(3)O_(4),再通过离子强度调控法将Fe_(3)O_(4)负载到二维氧化石墨烯(GO)片层结构上,形成Fe_(3)O_(4)/GO复合纳米材料(magG),再以共沉淀法制备Fe_(3)O_(4)/GO/CeO_(2)(magG/CeO_(2))复合纳米材料,并将其作为纳米吸附剂应用于亚甲基蓝的吸附去除研究。该magG/CeO_(2)复合纳米材料具有Fe_(3)O_(4)磁核、GO二维片状结构及CeO_(2)功能材料赋于其方便磁分离性能、提供更多的吸附位点,对亚甲基蓝表现出良好的吸附性能。magG/CeO_(2)多功能复合纳米材料通过红外光谱(FT-IR)技术表征,并优化该magG/CeO_(2)吸附剂的用量、溶液初始pH、震荡时间、解吸剂H2O_(2)的用量等条件,进一步考察该纳米吸附剂对亚甲基蓝的再循环次数及最大吸附量。实验结果表明,在最佳条件下,对亚甲基蓝的吸附去除率达97%以上;经过5次吸附-解吸-再吸附循环过程,对亚甲基蓝的吸附率仍保持在85%以上;最大吸附容量q_(max)=12.75 mg/g,magG/CeO_(2)复合纳米材料是一种新型的、性能优良的纳米吸附剂材料,对亚甲基蓝具有高效吸附去除的效果。 展开更多
关键词 磁性石墨烯基负载ceo_(2)(magG/ceo_(2)) 亚甲蓝 去除
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