Synthesis of crystalline mesoporous-assembled ZrO2 nanoparticles via a facile surfactant-aided sol–gel process and their photocatalytic dye degradation activity

2013 ◽  
Vol 228 ◽  
pp. 256-262 ◽  
Author(s):  
Thammanoon Sreethawong ◽  
Supachai Ngamsinlapasathian ◽  
Susumu Yoshikawa
Keyword(s):  
Dye Degradation ◽  
Sol Gel ◽  
Zro2 Nanoparticles ◽  
Sol Gel Process ◽  
Degradation Activity ◽  
Photocatalytic Dye Degradation

Sol–Gel Assisted Isotropic Morphological Progression in Nanostructured MoO3 and Allied Investigations on Photocatalytic Dye-Degradation

2019 ◽  
Vol 19 (6) ◽  
pp. 3479-3486 ◽  
Author(s):  
Nilam Qureshi ◽  
Manish Shinde ◽  
Sudhir Arbuj ◽  
Sunit Rane ◽  
Anand Bhalerao ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Optical Properties ◽  
Photocatalytic Degradation ◽  
Rate Constants ◽  
Dye Degradation ◽  
Sol Gel ◽  
High Rate ◽  
Photocatalytic Dye Degradation ◽  
Gel Technique ◽  
Synthesis Protocol

We report tunable-morphology oriented facile yet scalable route to synthesize 1D (nanorod) and 2D (nanobelt) MoO3 nanostructures at gram scale using conventional as well as sonochemistry assisted sol–gel technique. The structural, morphological and optical properties of the samples can be befittingly altered by varying the synthesis protocol. The resultant orthorhombic MoO3 nanomorphs demonstrated efficient and expeditious photocatalytic degradation of the pollutant dye, Methylene Blue (MB). We have observed that appreciable photocatalytic MB dye-degradation can be accomplished within 30 minutes with high rate constants of 0.0786 min−1 and 0.233 min−1 for rod and belt-like MoO3-nanostructures, respectively. The pilot results indicate that the resultant MoO3 nanomorphs can be potentially used as solar light driven industrial photocatalyst material with their intrinsic photostability.

scholarly journals Rate-Limiting Steps of Dye Degradation over Titania-Silica Core-Shell Photocatalysts

Catalysts ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 583 ◽  
Author(s):  
Ariane Giesriegl ◽  
Jakob Blaschke ◽  
Shaghayegh Naghdi ◽  
Dominik Eder
Keyword(s):  
Dye Degradation ◽  
Sol Gel ◽  
Dye Adsorption ◽  
Thin Layers ◽  
Continuous Change ◽  
Uv Illumination ◽  
Rate Limiting Step ◽  
Sol Gel Process ◽  
Rate Limiting ◽  
Positively Charged

In this work, we employed a step-by-step sol-gel process to controllably deposit ultra-thin layers of SiO2 on anatase nanoparticles in the range between 0 and 1 nm. The deposition was confirmed by TEM, EDX, and ATR-FTIR (e.g., Ti-O-Si band at 960 cm-1). Zeta potential measurements unravelled a continuous change in surface charge density with increasing silica shell thickness. The photocatalysts were evaluated towards adsorption and degradation of positively-charged and negatively-charged dyes (methylene blue, methyl orange) under UV illumination. The growth mechanism follows the Stranski–Krastanov model with three thickness regimes: (a) Flat islands (first step), (b) mono/bilayers (second/third step), and (c) regular thick films (fourth/fifth step). The results suggest different rate limiting processes for these regimes: (a) For the thinnest scenario, acidic triple-phase boundaries (TPBs) increase the activity for both dyes with their accessibility being the rate limiting step; (b) for continuous mono/bilayers, dye adsorption on the negatively-charged SiO2 shells becomes the rate liming step, which leads to a stark increase in activity for the positively-charged MB and a decrease for MO; (c) for thicker shells, the activity decreases for both dyes and is limited by the charge transport through the isolating shells.

Adsorption Property and Photocatalytic Activity of Sol-Gel Prepared Porous TiO2 Using PEG1000 as Template

2011 ◽  
Vol 48-49 ◽  
pp. 153-156 ◽  
Author(s):  
Chun Ling Liu ◽  
Ru Yuan Li ◽  
Wen Jie Zhang
Keyword(s):  
Methyl Orange ◽  
Calcination Temperature ◽  
Adsorption Property ◽  
Sol Gel ◽  
Time Range ◽  
Porous Tio2 ◽  
Calcination Temperatures ◽  
Sol Gel Process ◽  
Degradation Activity ◽  
Content Range

PEG1000 was used as a template to prepare porous TiO2 photocatalyst through sol-gel process. The amount of PEG1000 and calcination temperature and time were studied with respect to porous TiO2 activity. At the optimum adding amount of PEG1000, 30.0% of the initial methyl orange was degraded. Methyl orange adsorption on the porous TiO2 maintained less than 2% during the whole template content range. During the calcination temperature range from 400 oC to 600 oC and time range from 2 h to 5 h, the optimum degradation activity appeared to the sample calcinated at 500 oC for 4 h. Adsorption of the materials had no variation at different calcination temperatures and times, and was quite weak compared with degradation efficiencies. 96.2% of the initial methyl orange was degraded after 100 min of irradiation.

Tailored Pt/TiO2 Photocatalyst with Controllable Phase Prepared via a Modified Sol–Gel Process for Dye Degradation

2018 ◽  
Vol 18 (3) ◽  
pp. 2235-2240 ◽  
Author(s):  
Bing-Shun Huang ◽  
En-Chin Su ◽  
Yun-Ya Huang ◽  
Hui-Hsin Tseng
Keyword(s):  
Dye Degradation ◽  
Sol Gel ◽  
Tio2 Photocatalyst ◽  
Sol Gel Process

Three way electron transfer of a C–N–S tri doped two-phase junction of TiO2nanoparticles for efficient visible light photocatalytic dye degradation

RSC Advances ◽  
2016 ◽  
Vol 6 (10) ◽  
pp. 7854-7863 ◽  
Author(s):  
S. Amreetha ◽  
S. Dhanuskodi ◽  
A. Nithya ◽  
K. Jothivenkatachalam
Keyword(s):  
Electron Transfer ◽  
Visible Light ◽  
Dye Degradation ◽  
Sol Gel ◽  
Two Phase ◽  
Gel Method ◽  
Sol Gel Method ◽  
Photocatalytic Dye Degradation ◽  
Visible Light Photocatalytic

C–N–S tridoped TiO2nanoparticles were synthesized by a sol–gel method using thiourea as a compound source of carbon (C), nitrogen (N) and sulphur (S).

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