Synthesis and Enhanced Photocatalytic Activity of Black Porous Zr-doped TiO₂ Monoliths

Abstract

Black Porous Zr-doped TiO 2 monoliths were successfully synthesized by a combined route including sol-gel method with polystyrene spheres as template followed by calcination at high temperature in the presence of oxygen. As-synthesized samples were then treated in hydrogen atmosphere at 500 C for 6 h to obtain black Porous Zr-doped TiO 2 monoliths. This as-synthesized black porous Zr-doped TiO 2 composite showed relatively narrow bandgap compared to the pure anatase phase of TiO 2 , which may have its origin from the contributions from the Zr impurity and oxygen vacancies. The photocatalytic activity of the black porous Zr-doped TiO 2 monolith was examined by carrying out the dye degradation on Rhodamine B under visible irradiation. Our experimental results indicate that black porous 0.9% Zr-doped TiO 2 sample exhibits high photocatalytic activity with the photodecomposition of 95.25% under visible irradiation for 120 min.

Preparation and characterization of Sn/La co-doped TiO2 nanomaterials and their phase transformation and photocatalytic activity

“…All samples show peaks corresponding to anatase phase at the temperature of 360 °C and 450 °C. Compared to 360 °C, the intensity of peaks at 450 °C increases and the width of peaks becomes narrow, which imply that crystalline integrity improves with increase in temperature 19 , 35 . Pure TiO 2 forms rutile phase when the heat treatment temperature is up to 600 °C.…”

“…On the one hand, La 3+ ions which on the surface of TiO 2 can trap the photogenerated electrons in conduction band, consequently, the recombination of electrons and pairs is retarded and the photogenerated pairs are separated effectively 47 . On the other hand, the photogenerated electrons in conduction band of TiO 2 can be transferred to conduction band of SnO 2 , since the conduction band energy level of SnO 2 is lower than that of TiO 2 19 , 53 , 54 . Both Sn and La species are beneficial for the separation of photogenerated pairs, therefore, more electrons and holes can be involved into the photocatalytic degradation of RbB molecules.…”

The gelation of hydroxypropyl guar gum by nano‐ZrO2

“…There are many methods to synthesize Nano‐ZrO 2 with excellent properties, such as homogeneous precipitation, hydrothermal method, sol–gel method, micro‐emulsion, and oil‐water interface method . Compared with traditional methods, oil‐water interface method has many advantages like simple operation, low cost, and non‐toxic raw materials.…”

Microwave assisted sol–gel approach for Zr doped TiO2 as a benign photocatalyst for bismark brown red dye pollutant

“…21,22 Their porosity results in a enhanced absorption, high surface area, and rapid transfer of contaminants. 23 Numerous reports describe the fabrication of Zr-doped TiO 2 with enhanced photocatalytic activity by using high calcination temperatures. 24,25 Therefore, it is necessary to design a method for generating nanoparticles at low temperatures.…”