碳点修饰TiO_2复合材料的制备及吸附降解性能
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摘要
以山豆根叶为碳源采用水热法制备碳量子点(CQDs)溶液;分别以四氯化钛和硅酸钠为钛源和硅源制备SiO_2/TiO_2,经强碱刻蚀后加入碳点溶液真空复合制备CQDs-TiO_2材料,对制备的材料进行了表征,探讨了CQDs-TiO_2在不同光源、时间、pH下对亚甲基蓝的吸附降解效果。结果表明,荧光光谱分析证明成功制备了CQDs溶液;X射线衍射仪分析证明CQDs-TiO_2材料的主体相为锐钛矿,红外光谱波数1 400 cm~(-1)和2 926 cm~(-1)处的特征峰、450℃的热损失峰证明因CQDs成分引入导致谱图的差异,固体紫外漫反射得知CQDs的存在增强了复合材料对可见光的吸收。0.5 h内CQDs-TiO_2吸附亚甲基蓝占主导作用,2 h后吸附降解率达97.81%,白灯下的吸附降解效果略好于紫外灯下;CQDs-TiO_2的吸附降解率都随着pH的增大而增大。
The carbon quantum dots' solution was prepared by hydrothermal method from leaves of subprostrate sophora, and SiO_2/TiO_2 was prepared by using titanium tetrachloride and sodium silicate as the source of titanium and silicon, respectively. The CQDs/TiO_2 materials were prepared by vacuum compounding with carbon dots' solution and SiO_2/TiO_2 which was strongly etched by alkali. Materials were characterized by fluorescence spectra,infrared spectra and other means, the degradation-adsorption effects of CQDs/TiO_2 on methylene blue were investigated at different light sources, time and pH. The results showed that the carbon quantum dots' solution was successfully prepared by fluorescence spectrum analysis; The XRD diagram showed that the main phase of CQDs/TiO_2 material was anatase, the two characteristic peaks of CQDs/TiO_2 at 1 400 cm~(-1) and 2 926 cm~(-1), and the weight loss peak with thermal weight at 450 ℃, both showed that the difference of spectrum was caused by the introduction of carbon component. Adsorption was dominant in 0.5 h, and the adsorption-degradation rate of CQDs/TiO_2 reached 97.81% after 2 h, and the adsorption-degradation effect was slightly better at white lamp than that at ultraviolet lamp. The adsorption-degradation rates of the materials increased with the increase of p H.
The carbon quantum dots' solution was prepared by hydrothermal method from leaves of subprostrate sophora, and SiO_2/TiO_2 was prepared by using titanium tetrachloride and sodium silicate as the source of titanium and silicon, respectively. The CQDs/TiO_2 materials were prepared by vacuum compounding with carbon dots' solution and SiO_2/TiO_2 which was strongly etched by alkali. Materials were characterized by fluorescence spectra,infrared spectra and other means, the degradation-adsorption effects of CQDs/TiO_2 on methylene blue were investigated at different light sources, time and pH. The results showed that the carbon quantum dots' solution was successfully prepared by fluorescence spectrum analysis; The XRD diagram showed that the main phase of CQDs/TiO_2 material was anatase, the two characteristic peaks of CQDs/TiO_2 at 1 400 cm~(-1) and 2 926 cm~(-1), and the weight loss peak with thermal weight at 450 ℃, both showed that the difference of spectrum was caused by the introduction of carbon component. Adsorption was dominant in 0.5 h, and the adsorption-degradation rate of CQDs/TiO_2 reached 97.81% after 2 h, and the adsorption-degradation effect was slightly better at white lamp than that at ultraviolet lamp. The adsorption-degradation rates of the materials increased with the increase of p H.
引文
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[3]张钱新,王枫亮,谢治杰,等.掺N碳量子点负载于Ti O2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-Ti O2on activated carbon[J].Materials Today:Proceedings,20174(5):6495-6501.
[5]SINEENART S,WANICHAYA M,WISANU P.Photocatalytic of N-doped Ti O2nanofibers prepared by electrospinning[J].Energy Procedia,2013,34:751-756.
[6]JULI魣N A.RENGIFO H,MIRTA B,et al.Ti O2modified 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.
[7]VIPUL S,SUNEEL K,VENKATA K.Shape selective Au-Ti O2nanocomposites for photocatalytic applications[J].Materials Today:Proceedings,2016,3(6):1939-1948.
[8]WANG H X,XIAO J,YANG Z,et al.Rational design of nitrogen and sulfur co-doped carbon dots for efficient photoelectrical conversion applications[J].J Mater Chem A,2015,3:11287-11293.
[9]MA Z,MING H,HUANG H,et al.One-step ultrasonic synthesis of uorescent N-doped carbon dots from glocose and their visible-light sensitive photocatalytic ability[J].New J Chem,2012,36:861-864.
[10]TYAGI A,TRIPATHI K M,Singh N,et al.Green synthesis of carbon quantum dots from lemon peel wast:applications in sensing and photocatalysis[J].RSC Adv,2016,6:72423-72432.
[11]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]WANG F,GU Z,LEI W,WANG W,et al.Graphene quantum dots as a fluorescent sensing platform for highly efficient detection of copper(II)ions[J].Sensors and Actuators B,2014,190:516-522.
[13]MARIADOSS A J,ARUNKUMAR K.Photoinduced interaction of arylamine dye with carbon quantum dots ensued from Centella asiatica[J].Journal of Luminescence,2017,192:321-327.
[14]LI Y,LIU ZH M,WU Y C,et al.Carbon dots-Ti O2nanosheets composites for photoreduction of Cr(VI)under sunlight illumination:Favorable role of carbon dots[J].Applied Catalysis B:Environmental,2018,224:508-517.
[15]ZHANG B,HALIDAN M,ZHANG D D,et al.Preparation of coalbased C-Dots/Ti O2and its visible-light photocatalytic characteristics for degradation of pulping black liquor[J].Journal of photochemistry and photobiology A-chemistry,2017,345:54-62.
[16]LI Y R,LIU ZH M,WU Y C et al.Carbon dots-Ti O2nanosheets composites for photoreduction of Cr(VI)under sunlight illumination:Favorable role of carbon dots[J].applied catylysis B-environmental,2018:508-517.