碳点/TiO_2的制备及对亚甲基蓝的光催化性能
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摘要
碱性条件下以葡萄糖为碳量子碳源,水热法制备碳量子点,碳点与TiO_2通过冷凝回流制备TiO_2复合材料(CQDs/TiO_2),通过分子荧光、扫描电镜等手段对碳点溶液和材料进行表征,并研究CQDs/TiO_2在紫外灯、白炽灯下不同时间、pH下对亚甲基蓝的吸附降解性能及循环性能。结果表明:通过分子荧光成功制备了碳点溶液;CQDs/TiO_2虽然在扫描电镜和X射线衍射中的形貌和结构与纯TiO_2并无明显差异,但其在红外谱图(1090和2354cm-1)和热重(400～600℃)与纯TiO_2相比均有差异,在一定程度上证明了碳点成分的存在;固体紫外漫反射结果显示在200～800nm波长下CQDs/TiO_2材料对光的吸收都强于TiO_2;CQDs/TiO_2在同种光源下对亚甲基蓝溶液的降解率都比纯TiO_2的高,且白炽灯效果要优于紫外灯;材料对亚甲基蓝的降解率都随pH的增加而提高;CQDs/TiO_2在白炽灯下的循环性能较好。
Carbon dots(CQDs)/TiO_2 composites were prepared by condensation reflux with TiO_2 and carbon quantum dots(CQDs)which were prepared by hydrothermal method at alkaline conditions,using glucose as carbon quantum dots'source.The carbon dots'solution and materials were characterized by molecular fluorescence and scanning electron microscopy.The adsorption and degradation of methylene blue by CQDs/TiO_2 at different pH,different time under ultraviolet lamp and white lamp were studied.The results showed that there was no significant difference between the morphology and structure of CQDs/TiO_2 in SEM and XRD,but the difference between CQDs/TiO_2 and pure TiO_2 in infrared spectra(1090 cm-1 and 2354 cm-1)and thermogravimetry(400～600℃)showed the existence of carbon dots components.The results of solid UV diffuse reflection showed that the light absorption of CQDs/TiO_2 was stronger than that of TiO_2 at 200～800 nm wavelength.The degradation rate of CQDs/TiO_2 to methylene blue solution at the same light source was higher than that of pure TiO_2,and the effect of white lamp was better than that of UV lamp,and the degradation rate of methylene blue increased with the increase of pH value,the cycle performance of CQDs/TiO_2 at white light was better.
Carbon dots(CQDs)/TiO_2 composites were prepared by condensation reflux with TiO_2 and carbon quantum dots(CQDs)which were prepared by hydrothermal method at alkaline conditions,using glucose as carbon quantum dots'source.The carbon dots'solution and materials were characterized by molecular fluorescence and scanning electron microscopy.The adsorption and degradation of methylene blue by CQDs/TiO_2 at different pH,different time under ultraviolet lamp and white lamp were studied.The results showed that there was no significant difference between the morphology and structure of CQDs/TiO_2 in SEM and XRD,but the difference between CQDs/TiO_2 and pure TiO_2 in infrared spectra(1090 cm-1 and 2354 cm-1)and thermogravimetry(400～600℃)showed the existence of carbon dots components.The results of solid UV diffuse reflection showed that the light absorption of CQDs/TiO_2 was stronger than that of TiO_2 at 200～800 nm wavelength.The degradation rate of CQDs/TiO_2 to methylene blue solution at the same light source was higher than that of pure TiO_2,and the effect of white lamp was better than that of UV lamp,and the degradation rate of methylene blue increased with the increase of pH value,the cycle performance of CQDs/TiO_2 at white light was better.
引文
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[19]Li Y R,Liu Z M,Wu Y C,et al.Carbon dots-TiO2nanosheets composites for photoreduction of Cr(VI)under sunlight illumination:Favorable role of carbon dots[J].Applied Catylysis B-Environmental,2018,224:508-517.
[2]Wang M,Sun L,Lin Z,et al.p-n heterojunction photoelectrodes composed of Cu2O-loaded TiO2nanotube arrays with enhancedphotoelectrochemical and photoelectrocatalytic activities[J].Energy Environ Sci,2016(4):1211-1220.
[3]张钱新,王枫亮,谢治杰,等.掺N碳量子点负载于TiO2的复合催化剂光解甲芬那酸研究[J].中国环境科学,2017,37(8):2930-2940.
[4]Janjira S,Khanitta H,Sayan P.High photocatalytic activity of F-TiO2on activated carbon[J].Materials Today:Proceedings,2017,4(5):6495-6501.
[5]Julian A,Rengifo H,Mirta B,et al.TiO2 modified with polyoxotungstates should induce visible-light absorption and high photocatalytic activity through the formation of surface complexes[J].Applied Catalysis B:Environmental,2016,189:99-109.
[6]Vipul S,Suneel K,Venkata K.Shape selective Au-TiO2nanocomposites for photocatalytic applications[J].Materials Today:Proceedings,2016,3(6):1939-1948.
[7]Sun Y P,Zhou B,Lin Y,et al.Quantum-sized carbon dots for bright and colorful pHoto lumine scence[J].J Am Chem Soc,2006,128(24):7756-7757.
[8]孙英祥,孙相宝,何志伟,等.桃花水热法一步合成水溶性荧光碳点[J].材料科学与工程学报,2014,32(3):393-397.
[9]石鑫,徐建萍,李霖霖,等.碳量子点负载TiO2纳米棒阵列的光电化学性能[J].发光学报,2015,36(8):898-905.
[10]Sun M X,Ma X Q,Chen Xi,et al.A nanocomposite of carbon quantum dots and TiO2 nanotube arrays:enhancing photoelectrochemical and photocatalytic properties[J].RSC Adv,2014,4:1120-1127.
[11]Li H P,Zhu Y H,Cao H M,et al.Preparation and characterization of photocatalytic carbon dots-sensitized electrospun titania nanostructured fibers[J].Materials Research Bulletin,2013,48(2):232-237.
[12]Wang M,Han J,Hu Y,et al.Carbon-Incorporated NiO/TiO2mesoporous shells with p-n heterojunctions for efficient visible light photocatalysis[J].ACS Appl Mater Interfaces,2016,8(43):29511-29521.
[13]Li H,He X,Liu Y,et al.One-step ultrasonic synthesis of water-soluble carbon nanoparticles with excellent photoluminescent properties[J].Carbon,2011,49(2):605-609.
[14]张静,江玉亮,程钰,等.微波法制备丙三醇碳量子点并用作Fe3+探针[J].高等学校化学学报,2016,37(1):54-58.
[12]Zhang R,Chen W.Nitrogen-doped carbon quantum dots:facile synthesis and application as a“turn-off”fluorescent probe for detection of Hg2+ions[J].Biosensors and Bioelectronics,2014,55:83-90.
[16]张钱新,王枫亮,谢治杰,等.掺N碳量子点负载于TiO2的复合催化剂光解甲芬那酸研究[J].中国环境科学,2017,37(8):2930-2940.
[17]Li Y,Liu Zh M,Wu Y Ch,et al.Carbon dots-TiO2nanosheets composites for photoreduction of Cr(Ⅵ)under sunlight illumination:favorable role of carbon dots[J].Applied Catalysis B:Environmental,2018,224:508-517.
[18]Zhang B,Halidan M,Zhang D D,et al.Preparation of coalbased C-Dots/TiO2and its visible-light photocatalytic characteristics for degradation of pulping black liquor[J].Journal of photochemistry and photobiology A-Chemistry,2017,345:54-62.
[19]Li Y R,Liu Z M,Wu Y C,et al.Carbon dots-TiO2nanosheets composites for photoreduction of Cr(VI)under sunlight illumination:Favorable role of carbon dots[J].Applied Catylysis B-Environmental,2018,224:508-517.