Paper Title:
Photocatalytic Behavior of Na2ZrTi5O13 Sol-Gel
  Abstract

The photocatalytic activity of samples of the new ceramic semiconductor, Na2ZrTi5O13 sol-gel, was studied using two different reactions, the decomposition (oxidation) of methylene blue and reduction-oxidation of Pb (II) from aqueous solutions at room temperature. We synthesised Na2Ti5ZrO13, which is isostructural to the family of compounds with general formula AnMTimO13, (A = Li, Na, K; M = Zr). These materials present a zig zag arrangement forming rectangular tunnels in their structure. The synthesis of this compound was achieved by sol-gel technique using metalic alcoxides at two different pH, 3 and 9. The fresh gels were heat treated at 200°C, 400°C, 600°C and 800°C. The reaction products were characterized by X-ray diffraction (XRD), thermal analysis (DTA, TGA) and infrared spectroscopy (FTIR). The band gap energy (Eg) of each sample prepared was calculated from the UV-Vis absorption spectra. . The values of Eg obtained ranged from 3.5 to 3.2 eV. The best activity found for the methylene blue degradation was performed by the Na2ZrTi5O13 sol-gel pH 9, treated at 800oC (99%). We assumed that the photocatalytic activity is favored when the structure was already formed. Lead photocatalysed reactions using Na2ZrTi5O13 sol-gel pH 9, treated at 600 oC showed a higher eficiency (98%) than that obtained by TiO2 (degussa) (85%).

  Info
Periodical
Materials Science Forum (Volumes 486-487)
Edited by
Hyung Sun Kim, Sang-Yeop Park, Bo Young Hur and Soo Wohn Lee
Pages
57-60
DOI
10.4028/www.scientific.net/MSF.486-487.57
Citation
L. L. Garza-Tovar, L. M. Torres-Martínez, J.S. Ramos-Garza, L.G. Castillo-Torres, "Photocatalytic Behavior of Na2ZrTi5O13 Sol-Gel", Materials Science Forum, Vols. 486-487, pp. 57-60, 2005
Online since
June 2005
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Lorena L. Garza-Tovar, Leticia M. Torres-Martínez, D. Bernal-Rodríguez, N.N. Treviño
85
Authors: Kuo Sheng Kao, Wei Che Shih, Da Long Cheng, Po Hsiang Kuo, Pei Shan Hung, Chih Yuan Chan, Chin Ming Wang, Po Tsung Hsieh
Abstract:An expeditious evaluation for photocatalyst is set up (or established) in this study. The optical transmittance of the methyl blue solution...
2050
Authors: Xu Dong Lu, Cheng Zhi Jiang
Chapter 7:Materials Processing and Preparation
Abstract:0.1%Tb3+ and 0.2%Sm3+ co-doped TiO2 have been prepared by sol-gel method and characterized by the techniques...
224
Authors: Hang Xu, Min Yue Li
Chapter 14: Chemical Thermodynamics and Kinetics
Abstract:Nano-ZnO powders were prepared through gel-sol method with zinc acetate and lithium hydroxide as crude material. Nano-ZnO, as photo-catalyst,...
2819
Authors: Qing Shan Li, Biao Zhan, Wei Hong, Guang Zhong Xing
Chapter 1: Composite Materials and Technologies
Abstract:Opal as a carrier, tetrabutyl titanate as a titanium source, TiO2 loaded on opal was prepared by sol-gel technique. The photocatalysts were...
13