MoS_2/Ag_3PO_4复合材料的制备及其光催化降解亚甲基蓝
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摘要
采用一步水热法制备MoS_2,将合成的花状MoS_2纳米片通过化学沉淀法对Ag_3PO_4进行修饰,改变MoS_2的量,制备出5组不同质量百分比的MoS_2/Ag_3PO_4(5.0%,7.5%,10.0%,12.5%,15.0%)复合物.通过XRD、SEM、EDS对样品的物相结构、形貌及元素组成分析表征.再由紫外-可见漫反射(UV-Vis DRS)和荧光光谱(PL)进一步研究MoS_2的修饰对Ag_3PO_4光催化性质的影响.通过光催化降解亚甲基蓝实验,测试不同比例的MoS_2/Ag_3PO_4复合物作为光催化剂的活性.结果表明:10.0%质量百分比的MoS_2/Ag_3PO_4光催化活性最好,对亚甲基蓝的降解率在5 min内就已达到100%.具有层状结构的MoS_2可以作为很好的电子接受体,Ag_3PO_4导带上的电子会不断地转移到层状的MoS_2上,有效阻止Ag_3PO_4上的电子与空穴复合,从而使Ag_3PO_4的光催化性质提高和稳定性改善.循环实验显示,MoS_2/Ag_3PO_4复合光催化剂使用3次后依然可以达到85%的降解率.
The MoS_2 nanosheet was prepared by hydrothermal method and then used to modify Ag_3PO_4 through chemical precipitation method. By changing the amount of MoS_2, five groups of MoS_2/Ag_3PO_4 composites were prepared, which were 5.0%, 7.5%, 10.0%, 12.5%, 15.0%. The structure, element composition and morphology of the samples were characterized by XRD, EDS and SEM, the effects of MoS_2 modification on the photocatalytic properties of Ag_3PO_4 were studied by DRS and PL. The photocatalytic activity of the MoS_2/Ag_3PO_4 was measured and investigated by degradation of MB. The results showed that the photocatalytic activity of 10.0% MoS_2/Ag_3PO_4 was the best, and the degradation rate of MB reached 100% in 5 min only. Furthermore, its photocatalytic mechanism has been discussed. It was found that the MoS_2 can be used as a good electron acceptor, the electrons on the conduction band of the Ag_3PO_4 can be constantly transferred to the layered MoS_2, which effectively prevented the recombination of the electrons and holes. Thus, the photocatalytic properties and stability of Ag_3PO_4 were improved. Finally, the cycle experiments showed that MoS_2/Ag_3PO_4 compound still maintained 85%, a high degradation rate.
The MoS_2 nanosheet was prepared by hydrothermal method and then used to modify Ag_3PO_4 through chemical precipitation method. By changing the amount of MoS_2, five groups of MoS_2/Ag_3PO_4 composites were prepared, which were 5.0%, 7.5%, 10.0%, 12.5%, 15.0%. The structure, element composition and morphology of the samples were characterized by XRD, EDS and SEM, the effects of MoS_2 modification on the photocatalytic properties of Ag_3PO_4 were studied by DRS and PL. The photocatalytic activity of the MoS_2/Ag_3PO_4 was measured and investigated by degradation of MB. The results showed that the photocatalytic activity of 10.0% MoS_2/Ag_3PO_4 was the best, and the degradation rate of MB reached 100% in 5 min only. Furthermore, its photocatalytic mechanism has been discussed. It was found that the MoS_2 can be used as a good electron acceptor, the electrons on the conduction band of the Ag_3PO_4 can be constantly transferred to the layered MoS_2, which effectively prevented the recombination of the electrons and holes. Thus, the photocatalytic properties and stability of Ag_3PO_4 were improved. Finally, the cycle experiments showed that MoS_2/Ag_3PO_4 compound still maintained 85%, a high degradation rate.
引文
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[17] LU J M, ZHELIUK O, LEERMAKERS I, et al. Evidence for two-dimensional ising superconductivity in gated MoS2[J]. Science, 2016, 350 (6266): 1353-1357.
[18] 胡平, 陈震宇, 王快社, 等. 二维层状二硫化钼复合材料的研究进展及发展趋势[J]. 化工学报, 2017, 68 (4): 1286-1298.
[2] GUO R R, FAN Y T, TANG Y. Interesting Ag3PO4 concave rhombic dodecahedra: the same face with different morphologies and photocatalytic properties[J]. Rsc Advances, 2017, 7 (39): 23977-23981.
[3] XIE Y, HUANG Z H, ZHANG Z J, et al. Controlled synthesis and photocatalytic properties of rhombic dodecahedral Ag3PO4, with high surface energy[J]. Applied Surface Science, 2016, 389: 56-66.
[4] BI Y P, HU H Y, JIAO Z B, et al. Two-dimensional dendritic Ag3PO4 nanostructures and their photocatalytic properties[J]. Physical Chemistry Chemical Physics, 2012, 14 (42): 14486-14492.
[5] FRONTISTIS Z, ANTONOPOULOU M, PETALA A, et al. Photodegradation of ethyl paraben using simulated solar radiation and Ag3PO4 photocatalyst[J]. Journal of Hazardous Materials, 2017, 323 (A): 478-485.
[6] LUO C Y, HUANG W Q, XU L, et al. Enhanced photocatalytic performance of an Ag3PO4 photocatalyst via fullerene modification: first-principles study[J]. Physical Chemistry Chemical Physics, 2015, 18 (4): 2878-2886.
[7] 余长林, 魏龙福, 李家德, 等. GO/Ag3PO4复合光催化剂的制备、表征及光催化性能[J]. 物理化学学报, 2015, 31 (10): 1932-1938.
[8] LIN X, HOU J, JIANG S S, et al. A Z-scheme visible-light-driven Ag/Ag3PO4/Bi2MoO6 photocatalyst: synthesis and enhanced photocatalytic activity[J]. Rsc Advances, 2015, 5 (127): 104815-104821.
[9] LI Q Y, WANG F L, HUA Y X, et al. Deposition-precipitation preparation of Ag/Ag3PO4/WO3 nanocomposites for efficient visible-light degradation of rhodamine B under strongly acidic/alkaline conditions[J]. Journal of Colloid & Interface Science, 2017, 506: 207-302.
[10] BI Y P, OUYANG S X, CAO J Y, et al. Facile synthesis of rhombic dodecahedral AgX/Ag3PO4 (X=Cl, Br, I) heterocrystals with enhanced photocatalytic properties and stabilities[J]. Physical Chemistry Chemical Physics, 2011, 13 (21): 10071-10075.
[11] AMORNPITOKSUK P, SUWANBOON S. Photocatalytic decolorization of methylene blue dye by Ag3 PO4-AgX (X=Cl, Br, and I) under visible light[J]. Advanced Powder Technology, 2014, 25 (3): 1026-1030.
[12] KATSUMATA H, SAKAI T, SUZUKI T, et al. Highly efficient photocatalytic activity of g-C3N4/Ag3PO4 hybrid photocatalysts through Z-scheme photocatalytic mechanism under visible light[J]. Industrial & Engineering Chemistry Research, 2014, 53 (19): 8018-8025.
[13] HE Y M, ZHANG L H, TENG B T, et al. New application of Z-scheme Ag3PO4/g-C3N4composite in converting CO2 to fuel[J]. Environmental Science & Technology, 2015, 49 (1): 649-656.
[14] ZHANG L L, ZHANG H C, HUANG H, et al. ChemInform abstract: Ag3PO4/SnO2, semiconductor nanocomposites with enhanced photocatalytic activity and stability[J]. Cheminform, 2012, 43 (49): 1541-1544.
[15] XIANG Q J, LANG D, SHEN T T, et al. Graphene-modified nanosized Ag3PO4, photocatalysts for enhanced visible-light photocatalytic activity and stability[J]. Applied Catalysis B: Environmental, 2015, 162: 196-203.
[16] 顾品超, 张楷亮, 冯玉林, 等. 层状二硫化钼研究进展[J]. 物理学报, 2016, 65 (1): 018102.
[17] LU J M, ZHELIUK O, LEERMAKERS I, et al. Evidence for two-dimensional ising superconductivity in gated MoS2[J]. Science, 2016, 350 (6266): 1353-1357.
[18] 胡平, 陈震宇, 王快社, 等. 二维层状二硫化钼复合材料的研究进展及发展趋势[J]. 化工学报, 2017, 68 (4): 1286-1298.