Photocatalytic Degradation of Methylene Blue over TiO2 Pretreated with Varying Concentrations of NaOH

Abstract

In this paper, different NaOH concentrations (2, 5, 10, and 15 M) were used to treat {001}TiO2. The effect of NaOH on the crystal structure, morphology, optical properties, light raw electronic-hole recombination, and degradation performance of {001}TiO2 on methylene blue were studied. The results demonstrate that rutile TiO2 appeared when the NaOH concentration was as high as 10 M, showing much better photolytic performance than others. As the concentration of sodium hydroxide increases, the morphology changes accordingly. The specific surface area increases and the optical electronic-hole recombination rate decreases. Radical scavenging tests showed that hydroxyl radical and hole are very important in photocatalysis.

Photocatalytic Activity of Nanostructured Titania Films Obtained by Electrochemical, Chemical, and Thermal Oxidation of Ti6Al4V Alloy—Comparative Analysis

“…It manifests by a linear trend of the concentration-time data plot (Figure 8). Contrary, the decrease of MB concentration has exponential character, (Figure 9), similar to those visible in the literature [69,70]. It forces the application of two different approaches to experimental data.…”

Heterostructure Cu2O/(001)TiO2 Effected on Photocatalytic Degradation of Ammonia of Livestock Houses

“…In the process of adding glucose drop by drop, the concentration of NaOH was also decreasing gradually. It was found that NaOH and (001)TiO 2 not only increased the content of (001) facets, but also changed the morphology of the catalysts, which was consistent with the results of Hou et al [47]. CuSO + 2NaOH = Cu(OH) + Na SO ↓…”

Preparation of Cu2O@TiOF2/TiO2and its photocatalytic degradation of tetracycline hydrochloride wastewater

“…The XRD pattern of the sample is shown in Fig. 2 16 . Therefore, it can be seen that Cu and Ti have been successfully compounded.…”

“…TiO 2 has good chemical and biological stability, but it has become a bottleneck for development due to its low light utilization and fast photocarriers recombination. [16][17][18][19] To change this situation, many studies have enhanced the response of TiO 2 in the visible region by doping TiO 2 with non-metals (C, N, F, S, etc.) 2,[20][21][22] and semiconductors (Cu 2 O, CdS, etc.).…”