TAILIEUCHUNG - Modification of titanium dioxide nanomaterials by sulfur for photocatalytic degradation of methylene blue even under visible light

This paper presents a study on preparation of sulfur doped titanium dioxide using potassium fluorotitanate and sodium sulfate as precursors. The obtained results indicated that the doped TiO2 exhibited very high photocatalytic activity for degradation of methylene blue even under visible light. | Journal of Science and Technology 54 (2A) (2016) 164-170 MODIFICATION OF TITANIUM DIOXIDE NANOMATERIALS BY SULFUR FOR PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE EVEN UNDER VISIBLE LIGHT Nguyen Tan Lam1, Ho Thi Nhat Linh1, Nguyen Thi Phuong Le Chi1, Nguyen Thi Dieu Cam1, Mai Hung Thanh Tung2, *, Nguyen Van Noi3 1 Quy Nhon University, 170 An Duong Vuong Street, Quy Nhon City, Binh Dinh, Vietnam 2 Thu Dau Mot University, No. 6 Tran Van On Street, Phu Hoa Ward, Thu Dau Mot City, Binh Duong, Vietnam 3 Hanoi University of Science, Vietnam National University, 334 Nguyen Trai, Hanoi, Vietnam * Email: maihungthanhtung@ Received: 1 April 2016; Accepted for publication: 15 June 2016 ABSTRACT This paper presents a study on preparation of sulfur doped titanium dioxide using potassium fluorotitanate and sodium sulfate as precursors. The obtained results indicated that the doped TiO2 exhibited very high photocatalytic activity for degradation of methylene blue even under visible light. The increasing in the added sulfur amounts led to significantly increase in the degradation of methylene blue. When the S/TiO2 mole ratios increased from 10 to 25%, the degradation of methylene blue under compact light increased from to , respectively. Keywords: potassium fluorotitanate, titanium dioxide, sulfur, photocatalyst, visible light. 1. INTRODUCTION Titanium dioxide (TiO2) could mineralize various toxic organic compounds into harmless inorganic substances such as CO2 and H2O. However, TiO2 could be only activated by UV radiation because of its wide band gap energy (Ebg = eV), which is equivalent to radiation of wavelength less than or equal to 389 nm [1]. The use of the UV irradiation as the excitation source accompanies by safety issues and high energy consumption. Solar light is a natural radiation source, however, there is only approximately 7 % of the solar radiation lies in the UV region leading to the small use of TiO2 under solar radiation. .

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