Study on fabrication and photocatalytic performance of Ag2C2O4/TiO2 heterojunctions
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摘要: 采用溶胶-凝胶法制备了锐钛矿型TiO2，通过沉淀法成功将Ag2C2O4沉积于TiO2表面制备了Ag2C2O4/TiO2异质结。采用孔隙比表面分析仪(BET)、X-射线衍射仪(XRD)等对Ag2C2O4/TiO2异质结结构和光响应能力进行了表征；运用表面光电压仪(SPS)等对光催化剂的光生电荷分离特性进行了研究；考察了异质结光催化剂对模拟污染物罗丹明B的催化降解性能。结果表明：当Ag2C2O4/TiO2摩尔比为7.0%时，异质结光催化剂的光生电子-空穴分离速率最高，该光催化剂对罗丹明B的光催化降解性能最好。Abstract: In this study, A-TiO2 was prepared by a Sol-Gel method, and then Ag2C2O4 was deposited on the surface of TiO2 to construct Ag2C2O4/TiO2 heterojunctions by a precipitation method. The textural properties, crystal structures and light response capacity were studied by Brunauer-Emmett-Teller (BET) method and X-ray diffraction (XRD) . Surface photovoltage spectroscopy (SPS) was employed to study the separation of photoinduced carriers. Using Rhodamine B (RhB) as model pollutant, the photocatalytic activities of Ag2C2O4/TiO2 heterojunctions were investigated under Xe lamp (simulated sunlight) irradiation. The results show that when the molar ratio of Ag2C2O4/TiO2 is 7.0%, the sample displays the highest separation of photoinduced carriers, thus the photocatalyst exhibits the highest destruction capacity toward degradation of RhB.
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Key words:
- TiO2 /
- Ag2C2O4 /
- heterojunctions /
- photocatalytic performance
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图 1 Ag2C2O4/TiO2异质结的XRD谱(a) 及局部放大(b)
Figure 1. XRD patterns of Ag2C2O4/TiO2 heterojunctions (a) and enlarged XRD patterns of heterojunctions from 2θ=20º~35º(b)
图 2 7% Ag2C2O4/TiO2催化剂的EDS谱
Figure 2. EDS patterns of 7.0 %Ag2C2O4/TiO2 heterojunctions
图 3 Ag2C2O4/TiO2异质结催化剂对罗丹明B溶液的降解率
罗丹明B的浓度为10 mg/L， pH=7.49， 氙灯光照60 min
Figure 3. Decolorization efficiency of RhB solution by Ag2C2O4/TiO2 heterojunctions
图 4 Ag2C2O4/TiO2异质结催化剂 SPS图谱
（Ag2C2O4/TiO2的摩尔比: a: 0%; b:1.0%; c:3.0%;d:5.0%; e:9.0%; f:7.0%)
Figure 4. SPS patterns of Ag2C2O4/TiO2 heterojunctions
图 5 不同捕获剂对罗丹明B脱色率的影响
罗丹明B浓度为10 mg/L， pH=7.49，氙灯光照60 min
Figure 5. Effect of different scavengers on decolorization efficiency of RhB
图 6 NBT在不同体系中光照1 h后的紫外-可见吸收光谱
Figure 6. UV-Vis spectra of NBT solution on different catalysts after 1 h visible light irradiation
表 1 异质结光催化剂Ag2C2O4/TiO2的比表面参数
Table 1. Specific surface parameters of Ag2C2O4/TiO2 heterojunctions
Ag2C2O4/TiO2 比表面积/(m2·g−1) 孔容/(mL·g−1) 孔半径/nm 0 45.2 0.024 1.06 0.01 42.5 0.023 1.06 0.03 41.1 0.021 1.02 0.05 37.8 0.020 1.06 0.07 33.9 0.018 1.05 0.09 35.0 0.018 1.03 
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[1] Fujshima A, Honda K. Electrochemical photolysis of water at a semiconductor electrode[J]. Nature, 1972,238:37−38. doi: 10.1038/238037a0 [2] Lianos P. Review of recent trends in photoelectrocatalytic conversion of solar energy to electricity and hydrogen[J]. Appl. Catal. B Environ., 2017,210:235−254. doi: 10.1016/j.apcatb.2017.03.067 [3] Zhu X, Li B. Convergence of efficiency of environmental pollution control investment in the coastal areas of China[J]. J. Coastal Res., 2020,105:36−41. [4] Ghosh S, Das A P. Modified titanium oxide (TiO2) nanocomposites and its array of applications: A review[J]. Toxicol. Environ. Chem., 2015,97:491−514. doi: 10.1080/02772248.2015.1052204 [5] Yang S Y, Choi W, Park H. TiO2 nanotube array photoelectrocatalyst and Ni-Sb-SnO2 electrocatalyst bifacial electrodes: A new type of bifunctional hybrid platform for water treatment[J]. ACS Appl. Mater. Interfaces, 2015,7:1907−1914. doi: 10.1021/am5076748 [6] Al-Mamun M R, Kader S, Islam M S, et al. Photocatalytic activity improvement and application of UV-TiO2 photocatalysis in textile wastewater treatment: A review[J]. J. Environ. Chem. Eng., 2019,7(5):103248. doi: 10.1016/j.jece.2019.103248 [7] Yu Y, Li F, Han X, et al. High-performance metal oxide-modified V/TiO2 catalysts for selective oxidation of 2-methylnaphthalene to 2-naphthaldehyde: an experimental and theoretical study[J]. Ind. Eng. Chem. Res., 2021,60(8):3435−3451. doi: 10.1021/acs.iecr.0c04697 [8] Dong B, Liu T, Li V, et al. Species, engineering and characterizations of defects in TiO2-based photocatalyst[J]. Chinese Chem. Lett., 2018,29(5):671−680. doi: 10.1016/j.cclet.2017.12.002 [9] Si Yujun, Li Minjiao, Xiong Zhongping, et al. TiO2 quantum dots modified g-C3N4 and its photocatalytic decoloration performance[J]. Iron Steel Vanadium Titanium, 2018,39(3):46−50. (司玉军, 李敏娇, 熊中平, 等. TiO2量子点修饰g-C3 N4及其光催化脱色性能研究[J]. 钢铁钒钛, 2018,39(3):46−50. doi: 10.7513/j.issn.1004-7638.2018.03.009Si Yujun, Li Minjiao, Xiong Zhongping, et al. TiO2 quantum dots modified g-C3N4 and its photocatalytic decoloration performance[J]. Iron Steel Vanadium Titanium, 2018, 39(3): 46-50. doi: 10.7513/j.issn.1004-7638.2018.03.009 [10] Zhang Qinghong, Gao Lian. Preparation and the enhanced photocatalytic activity of highly dispersed Pt loaded on TiO2 nanocrystals[J]. Acta Chim. Sinica, 2005,63(1):65−70. (张青红, 高濂. 高度分散的Pt/TiO2的制备及光催化活性[J]. 化学学报, 2005,63(1):65−70. doi: 10.3321/j.issn:0567-7351.2005.01.013Zhang Qinghong, Gao Lian. Preparation and the enhanced photocatalytic activity of highly dispersed Pt loaded on TiO2 nanocrystals[J]. Acta Chim. Sinica, 2005, 63(1): 65-70. doi: 10.3321/j.issn:0567-7351.2005.01.013 [11] Gao Jingyu, Li Lina, Zhao Yubao. Highly efficient degradation of organohalides pollutants by Pd/TiO2 photocatalyst[J]. Environ. Prot. Sci., 2021,47(5):133−139. (高靖雨, 李莉娜, 赵玉宝. Pd-TiO2光催化高效降解有机卤代污染物[J]. 环境保护科学, 2021,47(5):133−139.Gao Jingyu, Li Lina, Zhao Yubao. Highly efficient degradation of organohalides pollutants by Pd/TiO2 photocatalyst[J]. Environ. Prot. Sci. , 2021, 47(5): 133-139. [12] Karimi-Maleh H, Kumar B G, Rajendran S, et al. Tuning of metal oxides photocatalytic performance using Ag nanoparticles integration[J]. J. Mol. Liq., 2020,314:113588. doi: 10.1016/j.molliq.2020.113588 [13] Wang Y, Zhang R, Li J, et al. First-principles study on transition metal-doped anatase TiO2[J]. Nanoscale Res. Lett., 2014,9(1):1−8. doi: 10.1186/1556-276X-9-1 [14] Ren Qingyun, Wang Songtao, Li Wenjing, et al. Synthesis and photocatalytic properties of Zr doped TiO2 nanoparticles[J]. Journal of Functional Materials, 2021,52(11):11164−11168. (任庆云, 王松涛, 李汶静, 等. Zr掺杂TiO2纳米粒子的合成及光催化性能研究[J]. 功能材料, 2021,52(11):11164−11168. doi: 10.3969/j.issn.1001-9731.2021.11.024Ren Qingyun, Wang Songtao, Li Wenjing, et al. Synthesis and photocatalytic properties of Zr doped TiO2 nanoparticles[J]. Journal of Functional Materials, 2021, 52(11): 11164-11168. doi: 10.3969/j.issn.1001-9731.2021.11.024 [15] Wang Zhumei, Zhang Tianfeng, Li Yueming, et al. Photocatalytic properties of S-doped TiO2 nanopowders prepared by sol-gel method[J]. J. Synth. Cryst., 2018,47(4):765−769,776. (王竹梅, 张天峰, 李月明, 等. 溶胶-凝胶法制备S掺杂TiO2纳米粉体的光催化性能[J]. 人工晶体学报, 2018,47(4):765−769,776. doi: 10.3969/j.issn.1000-985X.2018.04.016Wang Zhumei, Zhang Tianfeng, Li Yueming, et al. Photocatalytic properties of S-doped TiO2 nanopowders prepared by sol-gel method method[J]. J. Synth. Cryst. , 2018, 47(4): 765-769, 776. doi: 10.3969/j.issn.1000-985X.2018.04.016 [16] Yang Q, Long M, Tan L, et al. Helical TiO2 nanotube arrays modified by Cu-Cu2O with ultrahigh sensitivity for non-enzymatic electro oxidation of glucose[J]. ACS Appl. Mater. Interfaces, 2015,7(23):12719−12730. doi: 10.1021/acsami.5b03401 [17] Li Z, Yu L, Liu Y, et al. Efficient quantum dot-sensitized solar cell based on CdSxSe1-x/Mn-CdS/TiO2 nanotube array electrode[J]. Electrochim. Acta, 2015,153:200−209. doi: 10.1016/j.electacta.2014.11.197 [18] Feng C, Li G, Ren P, et al. Effect of photo-corrosion of Ag2CO3 on visible light photocatalytic activity of two kinds of Ag2CO3/TiO2 prepared from different precursors[J]. Appl. Catal. B:Environ., 2014,158/159:224−232. doi: 10.1016/j.apcatb.2014.04.020 [19] Sun Nan, Chen Peng, Ren Youliang. Preparation and photocatalytic properties of AgBr/TiO2 nanofibers[J]. J. Synth. Cryst., 2021,50(1):130−137. (孙楠, 陈鹏, 任有良. AgBr/TiO2纳米纤维的制备及其光催化性能研究[J]. 人工晶体学报, 2021,50(1):130−137.Sun Nan, Chen Peng, Ren Youliang. Preparation and photocatalytic properties of AgBr/TiO2 nanofibers[J]. J. Synth. Cryst. , 2021, 50(1): 130-137. [20] Chen Qingtao, Shi Xiangdong, Zhang Wenjie, et al. Preparation and photocatalytic performance of 2D TiO2/Ag3PO4 heterojunction composite catalyst[J]. Journal of Beijing University of Chemical Technology(Natural Science), 2021,48(3):48−58. (陈庆涛, 石向东, 张文杰, 等. TiO2/Ag3PO4异质结复合催化剂的制备及其光催化性能研究[J]. 北京化工大学学报(自然科学版), 2021,48(3):48−58.Chen Qingtao, Shi Xiangdong, Zhang Wenjie, et al. Preparation and photocatalytic performance of 2 D TiO2/Ag3PO4 heterojunction composite catalyst[J]. Journal of Beijing University of Chemical Technology(Natural Science), 2021, 48(3): 48-58. -
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