化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (11) : 122-126. DOI: 10.19817/j.cnki.issn 1006-3536.2020.11.027

新材料与新技术

TiO₂基多元复合材料的合成及其对MPB的光催化降解性能研究

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Preparation and performance of TiO₂ based multi-nanophotocatalyst on MPB degradation

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摘要

采用超声辅助的溶胶-凝胶法,制备了以蒙脱土为载体,La和H₃PMo₁₂O₄₀共掺杂改性的TiO₂基多元复合材料(LPM-TiO₂),采用多种表征分析方法对催化剂的晶型结构、吸附性能和光吸收特性等物理化学特性进行分析表征。选择对羟基苯甲酸甲酯(MPB)作为降解对象分别考察了LPM-TiO₂的紫外和可见光催化活性。结果表明:20mg/L MPB经40min紫外光照射后降解率可达100%,同时经120min可见光照射后降解率可达95.7%,LPM-TiO₂优异的紫外和可见光光催化性能,主要是由于H₃PMo₁₂O₄₀和La的加入可以有效地抑制光生载流子的复合。LPM-TiO₂具有良好的循环使用性能,其经5次循环使用后,MPB的降解率仍可达90%。

Abstract

La and H₃PMo₁₂O₄₀ modified TiO₂ multi-nanocatalysts were fabricated via a facile ultrasonic assistant sol-gel method using montmorillonoid as a carrier.The crystal structure,adsorption ability and optical absorption characteristics of the catalyst were characterized by many kinds of analysis technologies.In addition,methyl p-hydroxybenzoate (MPB) was selected as the degradation object to investigate the ultraviolet and visible light catalytic activities of LPM-TiO₂.The results shown that the 100% of MPB(20mg/L) was degraded after 40min UV-light irradiation,about 95.7% of MPB can be degradation after 120min visible light irradiation.The remarkably enhanced photocatalytic degradation performance was mainly owing to the adding of La³⁺ and H₃PMo₁₂O₄₀ can inhibit the recombination of the photogeneration electron and hole.And the stability results showed that the degradation rate can remain above 90% after 5 times reuse cycles of the photocatalyst.

关键词

二氧化钛 / 镧 / 磷钼酸 / 光催化 / 降解性能

Key words

titanium dioxide / lanthanum / phosphomolybdic acid / photocatalysis / degradation performance

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TiO₂基多元复合材料的合成及其对MPB的光催化降解性能研究[J]. 化工新型材料, 2020, 48(11): 122-126 DOI:10.19817/j.cnki.issn 1006-3536.2020.11.027

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原文顺序 | 出版日期 | 本文引用

[1] Field J A,Johnson C A,Rose J B.What is “emerging”？[J].Environ Sci Technol,2006,40(23):7105-7105.
[2] Calafat A M,Ye X Y,Wong L Y,et al.Urinary concentrations of four parabens in the U.S.population:NHANES 2005—2006[J].Environ Health Persp,2010,118(5):679-685.
[3] Cooper C,Burch R.Mesoporous materials for water treatment processes[J].Water Res,1999,33(18):3695-3700.
[4] Leal L H,Vieno N,Temmink H.Occurrence of xenobiotics in gray water and removal in three biological treatment systems[J].Environ Sci Technol,2010,44(17):6835-6842.
[5] Lin Y.X,Ferronato C,Deng N S,et al.Study of benzylparaben photocatalytic degradation by TiO₂[J].Appl Catal B:Envrion,2011,104:353-360.
[6] Velegraki T,Hapeshi E,Poulios I.Solar-induced heterogeneous photocatalytic degradation of methyl-paraben[J].Appl Catal B:Environ,2015,178:2-11.
[7] Li F B,Li X Z,Hou M F,et al.Enhanced photocatalytic activity of Ce³⁺-TiO₂ for 2-mercaptobenzothiazole degradation in aqueous suspension for odor control[J].Appl Catal A:Gen,2005,285(1-2):181-189.
[8] Pan X Y,Xu Y J.Efficient thermal- and photocatalyst of Pd nanoparticles on TiO₂ achieved by an oxygen vacancies promoted synthesis strategy[J].ACS Appl Mater Interf,2014,6:1879-1886.
[9] Marci G,Garcia-Lopez E,Palmisano L,et al.Preparation,characterization and photocatalytic activity of TiO₂ impregnated with the heteropolyacid H₃PW₁₂O₄₀:photo-assisted degradation of 2-propanol in gas-solid regime[J].Appl Catal B:Environ,2009(3-4):497-506.
[10] Yang Y,Guo Y H,Hu C W,et al.Lacunary keggin-type polyoxometalates-based macroporous composite films:preparation and photocatalytic activity[J].Appl Catal A:Gen,2003,252(2):305-314.
[11] 李凝,高新航,张晓华,等,La³⁺的掺杂量对负载型硅钨杂多酸的催化性能影响[J].中国稀土学报,2016,34(4):411-416.
[12] Huang D G,Liao S J,Zhou W B,et al.Synthesis of samarium- and nitrogen-co-doped TiO₂ by modified hydrothermal method and its photocatalytic performance for the degradation of 4-chlorophenol[J].J Phys Chem Solids,2009,70(5):853-859.
[13] Dai Z,Qin F,Zhao H P,et al.Crystal defect engineering of aurivillius Bi₂MoO₆ by Ce doping for increased reactive species production in photocatalysis[J].ACS Catal,2016,6(5):3180-3192.
[14] Wang W J,Li Y C,Kang Z W,et al.A NIR-driven photocatalyst based NaYF₄∶Yb,Tm@TiO₂ core-shell structure supported on reduced graphene oxide[J].Appl Catal B:Environ,2015,182:184-192.
[15] 钟琦,王彬彬,黄紫彬,等,稀土掺杂纳米TiO₂的研究进展[J].中国稀土学报,2016,34(4):385-395.
[16] Shi H X,Zhang T Y,An T C,et al.Enhancement of photocatalytic activity of nano-scale TiO₂ particles co-doped by rare earth elements and heteropolyacids[J].J Coll Interf Sci,2012,380:121-127.
[17] Park H,Choi W.Photoelectrochemical investigation on electron transfer mediating behaviors of polyoxometalate in UV-illuminated suspensions of TiO₂ and Pt/TiO₂[J].J Phys Chem B,2003,107(16):3885-3890.
[18] An T C,Liu J K,Li G Y,et.al.Structural and photocatalytic degradation characteristics of hydrothermally treated mesoporous TiO₂[J].Appl Catal A:Gen,2008,350(2):237-243.
[19] Liu J K,An T C,Li G Y,et al.Preparation and characterization of highly active mesoporous TiO₂ photocatalysts by hydrothermal synthesis under weak acid conditions[J].Micropor Mesopor Mater,2009,124(1-3):197-203.
[20] Grabowska E,Sobczak J W,Gazda M,et.al.Surface properties and visible light activity of W-TiO₂ photocatalysts prepared by surface impregnation and sol-gel method[J].Appl Catal B:Environ,2012,117-118:351-359.
[21] Fang H,Gao Y,Li G,et al.Advanced oxidation kinetics and mechanism of preservative propylparaben degradation in aqueous suspension of TiO₂ and risk assessment of its degradation products[J].Environ Sci Technol,2013,47(6):2704-2712.
[22] Wang W,Ng T W,Ho W K,et al.CdIn₂S₄ microsphere as an efficient visible-light-driven photocatalyst for bacterial inactivation:synthesis,characterizations and photocatalytic inactivation mechanisms[J].Appl Catal B:Environ,2013,129:482-490.
[23] Chen Y,Lu A,Li Y,et al.Naturally occurring sphalerite as a novel cost-effective photocatalyst for bacterial disinfection under visible light[J].Environ Sci Technol,2011,45(13):5689-5695.