Characterization of the thin layer photocatalysts TiO2 and V2O5- and Fe2O3- doped TiO2 prepared by the sol–gel method

Tóm tắt

The catalysts TiO2 and TiO2 doped with Fe and V were prepared using the sol–gel method. TiO2-modified samples were obtained in the form of a thick film on pyrex glass sticks and tubes and were used as catalysts in the gas phase photo-oxidation of p-xylene. The physico-chemical characteristics of the catalysts were determined using the methods of Brunauer–Emmett–Teller adsorption, x-ray diffraction, and infrared, ultraviolet and visible and Raman spectroscopies. The experimental results show that the introduction of V did not expand the region of light absorption, but slightly reduced the size of the TiO2 particles, and reduced the number of OH-groups, which should decrease the photocatalytic activity and efficiency of the obtained catalysts compared to those of pure TiO2. The Fe-doped TiO2 samples, in contrast, are characterized by an extension of the spectrum of photon absorption to the visible region with wavenumbers λ up to 464 nm and the values of their band gap energy decreased to lower quantities (up to 2.67 eV), therefore they should have higher catalytic activity and conversion efficiency of p-xylene in the visible region than the original sample. For these catalysts, a combined utilization of radiation by ultraviolet (λ = 365 nm) and visible (λ = 470 nm) light increased the activity and the yield in p-xylene conversion by a factor of around 2–3, as well as making these quantities more stable in comparison with those of TiO2–P25 Degussa.

Tài liệu tham khảo

[1] Brady G S 1971 Materials Handbook (New York: McGraw-Hill)
[2] Shah S I, Li W, Huang C P, Jung O and Ni C 2002 Proc. Nat. Acad. Sci. USA 99 6482
[3] Shang D M and Ching W Y 1995 Phys. Rev. B l51 13023
[4] Wade J 2005 An investigation of TiO2–ZnFe2O4 nanocomposites for visible light photocatalysis Master Thesis Electrical Engineering College of Engineering University, South Florida
[5] Amemiya S 2004 Three Bond Tech. News 62 1
[6] Kavan L, Grazel M, Gilbert S E, Klemenz C and Scheel H J ¨ 1996 J. Am. Chem. Soc. 118 6716
[7] Hashimoto K, Irie H and Fujishima A 2005 Japan J. Appl. Phys. 44 8269
[8] Choi W Y, Termin A and Hoffmann M R 1994 J. Phys. Chem. 84 13669
[9] Netchakun N, Phanichphant S, Chiang K and Amal R 2007 Effects of transition metal ion doping on the photocatalytic activity of TiO2 Congress on Particle Technology (27–29 March 2007, Nurnberg, Germany) ¨
[10] Yuan Z 2007 Thin Solid Films 515 7091
[11] Umebayashi T, Yamaki T, Itoh H and Asai K 2002 J. Phys. Chem. Solids 63 1909
[12] Valentin C D 2007 Chem. Phys. 339 44
[13] Nguyen V H and Nguyen B H 2012 Adv. Nat. Sci.: Nanosci. Nanotechnol. 3 023001
[14] Wang C M and Chung S L 2007 Dye-sensitized Solar Cell Using a TiO2 Nanocrystalline Film Electrode Prepared by Solution Combustion Synthesis (California: NSTI Nanotech)
[15] Jung K Y and Park S B 2001 Korean J. Chem. Eng. 18 879
[16] Munuera G, Rives-Arnau V and Saucedo A 1979 J. Chem. Soc. 175 736
[17] Duan X, Sun D, Zhu Z, Chen X and Shi P 2002 J. Environ. Sci. Health A 37 679
[18] Einaga H, Futamura S and Ibusuk T 1999 Phys. Chem. Chem. Phys. 1 4903
[19] Hennezel O and Ollis D F 1997 J. Catal. 167 118
[20] Swamy V, Kuznetsov A, Dubrovinsky L S, Caruso R A, Schukin D G and Muddle B C 2005 Phys. Rev. B 71 184302
[21] Andreozzi R, Caprio V, Insola A and Marotta R 1999 Catal. Today 53 51
[22] Yu J C, Lin J and Kwok R W M 1998 J. Phys. Chem. B 102 5094
[23] Wang C, Bottcher C, Bahnemann D W and Dohrmann J K 2003 J. Mater. Chem. 13 2322
[24] Temkin M I 1976 Kinetics Catalysis 17 1095 (in Russian)

Các bài trích dẫn đến

1. Hemraj M Yadav, Jung-Sik Kim. Solvothermal synthesis of anatase TiO2-graphene oxide nanocomposites and their photocatalytic performance in Journal of Alloys and Compounds (Vol. 688, 2016)
2. Sudipto Pal, Anna Maria Laera, Antonio Licciulli, Massimo Catalano, Antonietta Taurino. Biphase TiO2 microspheres with enhanced photocatalytic activity in Industrial & Engineering Chemistry Research (Vol. 53, No. 19, 2014)
3. Marco Fronzi, Anna Iwaszuk, Aoife Lucid, Michael Nolan. Metal oxide nanocluster-modified TiO2 as solar activated photocatalyst materials in Journal of Physics: Condensed Matter (Vol. 28, No. 7, 2016)
4. Chan Wai Soo, Joon Ching Juan, Chin Wei Lai, Sharifah Bee Abd Hamid, Rahimi M Yusop. Fe-doped mesoporous anatase-brookite titania in the solar-light-induced photodegradation of Reactive Black 5 dye in Journal of the Taiwan Institute of Chemical Engineers (Vol. 68, 2016)
5. J Dhanalakshmi, Celina Selvakumari. Improved photo-induced charge carriers separation through the addition of erbium on TiO2 nanoparticles and its effect on photocatalytic degradation of rhodamine B in Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy (Vol. 190, 2018)
6. Abhishek Shukla, Abhishek K Bhardwaj, BK Pandey, SC Singh, KN Uttam, J Shah, RK Kotnala, R Gopal. Laser synthesized magnetically recyclable titanium ferrite nanoparticles for photodegradation of dyes in Journal of Materials Science: Materials in Electronics (Vol. 28, No. 20, 2017)
7. Ju Young Mun, Jin Young Park, Sung Jun Park, Hyun Kyoung Yang. Enhancement of light extraction efficiency with different molar amount of europium in TiO2: Eu3+ for WLEDs in Optik (Vol. 136, 2017)
8. Cam Loc Luu, Quoc Tuan Nguyen, Tri Nguyen, Si Thoang Ho. Kinetics of gas-phase photooxidation of p-xylene on nano TiO2 P25 thin film in Advances in Natural Sciences: Nanoscience and Nanotechnology (Vol. 9, No. 4, 2018)
9. Luu Cam Loc. PERFORMANCE OF TiO2 IN PHOTODEGRADATION SEAFOOD WASTEWATER in Vietnam Journal of Science and Technology (Vol. 54, 2016)
10. Lưu Cẩm Lộc, Nguyễn Trí, Nguyễn Thị Thùy Vân, Hoàng Tiến Cường, Hồ Linh Đa, Hoàng Chí Phú. Xử lý hợp chất hữu cơ khó phân hủy trong nước thải thủy sản bằng xúc tác quang TiO2 biến tính in Tạp chí Phát triển Khoa học và Công nghệ (Vol. 20)
11. Loc Cam Luu, Phu Chi Hoang, Tri Nguyen, Cuong Tien Hoang, Anh Cam Ha. Degradation of recalcitrant organic polluants in seafood wastewater by modified TiO2 photocatalysts in Science and Technology Development Journal-Natural Sciences (Vol. 1, 2017)