Na-CNB光催化材料合成及应用
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摘要
以尿素、四苯硼化钠、氢氧化钠溶液为前驱体,利用浸渍-焙烧法制备了Na OH与CNB不同质量比率的Na-CNB复合光催化剂。采用X射线衍射(XRD)、光致发光光谱(PL)、紫外-可见漫反射(UV-Vis DRS)、红外光谱(IR)等对该催化材料进行了表征,并考察了Na-CNB的紫外光催化活性。结果表明:Na+的掺杂有效地提高了CNB的光催化性能,在所有的Na-CNB光催化剂样品中,Na(0.1)-CNB催化剂具有最高的光催化活性,在优化条件下,紫外光照射2 h,光催化降解甲基橙降解率为69.85%。
With urea, four benzene boron sodium and Na OH as precursors, the composite Na-CNB photocatalysts were prepared by the dipping-roasting method. Na-CNB thus prepared were of various mass ratio of Na OH to CNB, and were characterized by XRD, PL, UV-vis DRS and FT-IR. In this experimental study, the activities of Na-CNB photocatalytic under UV were evaluated with methyl orange as photocatalytic reaction model compounds. The results of the evaluation showed that photocatalytic performances of CNB were remarkably improved by Na~+-doped CNB; and among the samples of Na-CNB photocatalysts, the photocatalyst of Na(0.1)-CNB had the highest UV photocatalytic activity. Under the optimized condition,the rate of photocatalytic degradation(with UV-irradiation for 2 h) of methyl orange reached up to 69.85%.
With urea, four benzene boron sodium and Na OH as precursors, the composite Na-CNB photocatalysts were prepared by the dipping-roasting method. Na-CNB thus prepared were of various mass ratio of Na OH to CNB, and were characterized by XRD, PL, UV-vis DRS and FT-IR. In this experimental study, the activities of Na-CNB photocatalytic under UV were evaluated with methyl orange as photocatalytic reaction model compounds. The results of the evaluation showed that photocatalytic performances of CNB were remarkably improved by Na~+-doped CNB; and among the samples of Na-CNB photocatalysts, the photocatalyst of Na(0.1)-CNB had the highest UV photocatalytic activity. Under the optimized condition,the rate of photocatalytic degradation(with UV-irradiation for 2 h) of methyl orange reached up to 69.85%.
引文
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[2]Zheng Yao,Liu Jian,Liang Ji,et al.Graphitic carbon nitride materials:controllable synthesis and applications in fuel cells and photocatalysis[J].Energy&Environmental Science,2014(5):6717-6731.
[3]张坤,师瑞娟,崔玉民,等.复合催化剂Si O2/CNI的制备及其光催化性能研究[J].化工新型材料,2017,45(4):180-183.Zhang Kun,Shi Ruijuan,Cui Yumin,et al.Study on preparation and photocatalytic performance of Si O2/CNI composite catalyst[J].New Chemical Materials,2017,45(4):180-183.
[4]崔玉民,肖依,朱良俊,等.三氧化二铟/B元素掺杂的gC3N4催化剂的制备及其性能研究[J].环境污染与防治,2017,39(5):490-493.Cui Yumin,Xiao Yi,Zhu Liangjun,et al.Study on preparation and photocatalytic property of In2O3/CNB[J].Environmental Pollution&Control,2017,39(5):490-493.
[5]Yan S C,Li Z,Zou Z.Photodegradation of Rhodamine B and methyl orange over boron-doped g-C3N4under visible light irradiation[J].Langmuir,2010(26):3894-3902.
[6]Wang Y,Di Y,Antonietti M,et al.Excellent visible-light photocatalysis of fluorinated polymeric carbon nitride solids[J].Chemistry of Materials,2010,22(18):5119-5121.
[7]Wang Y,Li H,Yao J,et al.Synthesis of boron doped polymeric carbon nitride solids and their use as metal-free catalysts for aliphatic C—H bond oxidation[J].Chemical Science,2011,2(3):446-450.
[8]Lin Z,Wang X.Nanostructure engineering and doping of conjugated carbon nitride semiconductors for hydrogen photosynthesis[J].Angewandte Chemie International Edition,2013,52(6):1735-1738.
[9]Jiang Jian,Lu Guangzhong,Miao Changxi,et al.Catalytic performance of X molecular sieve modified by alkali metal ions for the side-chain alkylation of toluene with methanol[J].Microporous and Mesoporous Materials,2013(167):213-220.
[10]Chen Ying,He Junhui,Tian Hua,et al.Enhanced formaldehyde oxidation on Pt/Mn O2catalysts modified with alkali metal salts[J].Journal of Colloid and Interface Science,2014,428(15):1-7.
[11]Bern V,Neves M C,Nunes M R,et al.Influence of the sodium/proton replacement on the structural,morphological and photocatalytic properties of titanate nanotubes[J].Journal of Photochemistry and Photobiology A:Chemistry,2013,232(15):50-56.
[12]崔玉民,李慧泉,凡素华,等.对苯二甲酸协同Bi2O3/Co3O4光催化降解甲基橙的研究[J].稀有金属,2015,39(1):55-61.Cui Yumin,Li Huiquan,Fan Suhua,et al.Photocatalytic degradation of methyl orange enhanced by terephthalic acid using Bi2O3/Co3O4as heterogeneous catalysts[J].Journal of Rare Metals,2015,39(1):55-61.
[13]Thomas A,Fischer A,Goettmann,et al.Graphitic carbon nitride materials:variation of structure and morphology and their use as metal-free catalysts[J].Journal of Materials Chemistry,2013,41(9):4893-4908.
[14]Li Xuefei,Zhang Jian,Shen Longhai,et al.Preparation and characterization of graphitic carbon nitride through pyrolysis of melamine[J].Applied Physics A:Materials Science&Processing,2012,94(2):387-392.
[15]Thomas A.Graphitic carbon nitride materials:variation of structure and morphology and their use as metal-free catalysts[J].Journal of Materials Chemistry,2008,41(9):4893-4908.
[16]Xinchen Wang,Siegfried Blechert,Markus Antonietti.Polymeric graphitic carbon nitride for heterogeneous photocatalysis[J].ACS Catalysis,2012(2):1596-1606.
[17]Wang Yong,Di Yan,Antonietti M,et al.Excellent visiblelight photocatalysis of fluorinated polymeric carbon nitride solids[J].Chemistry of Materials,2013,22(18):5119-5121.
[18]Liu G M,Zhao J C,Hidaka H.ESR spin-trapping detection of radical intermediates in the Ti O2-assisted photo-oxidation of sulforhodamine B under visible irradiation[J].J Photochem Photobiol A:Chem,2000,133(1/2):83-89.
[19]Liu G M,Li X,Zhao J C.Photooxidation mechanism of dye alizarin red in Ti O2dispersions under visible illumination:an experimental and theoretical examination[J].J Mol Cata A:Chem,2000,153(1/2):211-218.