scholarly journals Preparation and Properties of CaCO3-Supported Nano-TiO2 Composite with Improved Photocatalytic Performance

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3369
Author(s):  
Jie Wang ◽  
Sijia Sun ◽  
Lei Pan ◽  
Zhuoqun Xu ◽  
Hao Ding ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
Interaction Mechanism ◽  
Pure Tio2 ◽  
Degradation Efficiency ◽  
Nano Tio2 ◽  
Composite Photocatalyst ◽  
Tio2 Particles ◽  
Grinding Machine

In order to improve the photocatalytic degradation efficiency of nano-TiO2, reduce its usage and realize recycling and reuse, CaCO3–TiO2 composite photocatalyst was prepared with calcium carbonate (CaCO3) and TiO2 in a grinding machine through the integration of grinding depolymerization, dispersion and particle composition. The photocatalytic degradation performance, recycling performance, structure and morphology of CaCO3–TiO2 were studied. The interaction mechanism between CaCO3 and TiO2 and the improvement mechanism for the photocatalytic performance of TiO2 were also discussed. The results show that under the UV light irradiation for 20 and 40 min, the degradation efficiency of methyl orange by the composite photocatalyst with 40% TiO2 (mass fraction) was 90% and 100%, respectively. This was similar to that of pure TiO2, and the performance of the composite photocatalyst was almost unchanged after five cycles. CaCO3–TiO2 is formed by the uniform loading of nano-TiO2 particles on the CaCO3 surface, and the nano-TiO2 particles are well dispersed. Due to the facts that the dispersion of nano-TiO2 is improved in the presence of CaCO3 and the charge transport capability is improved through the interfacial chemical bonds between CaCO3 and TiO2, the formation of this complex is an intrinsic mechanism to improve the photocatalytic efficiency of nano-TiO2 and reduce its usage in application processes.

scholarly journals ZnCDs/ZnO@ZIF-8 Zeolite Composites for the Photocatalytic Degradation of Tetracycline

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 934
Author(s):  
Yong Cheng ◽  
Xiuxiu Wang ◽  
Yu Mei ◽  
Dan Wang ◽  
Changchun Ji
Keyword(s):  
Catalytic Activity ◽  
Photocatalytic Degradation ◽  
Photocatalytic Performance ◽  
Active Species ◽  
Degradation Efficiency ◽  
Experimental Result ◽  
Porous Nanostructure ◽  
Resultant Material

Considering the photocatalytic performance of CDs, ZnO, and the unique porous nanostructure and stability of ZIF-8, we prepared ZnCDs/ZnO@ZIF-8 zeolite composites. The resultant material represented an enhanced ability for the photodegradation of TC compared with that of ZnCDs and ZnO. The photocatalytic degradation efficiency reached over 85%. The catalytic activity of the composites was maintained after four cycles. The experimental result indicated that ×O2 radical was the active species in the reaction.

Photocatalytic degradation of azo dye using core@shell nano-TiO2 particles to reduce toxicity

2018 ◽  
Vol 25 (29) ◽  
pp. 29493-29504 ◽  
Author(s):  
Nesrin Ozmen ◽  
Sema Erdemoglu ◽  
Abbas Gungordu ◽  
Meltem Asilturk ◽  
Duygu Ozhan Turhan ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Azo Dye ◽  
Core Shell ◽  
Nano Tio2 ◽  
Tio2 Particles ◽  
Degradation Of Azo Dye

scholarly journals Photocatalytic performance of TiO2 particles in degradation of various organic dyes under visible and UV light irradiation

2020 ◽  
Author(s):  
A. T. Le ◽  
S. Y. Pung ◽  
S. L. Chiam ◽  
N. A. H. BT. N. Josoh ◽  
T. Y. Koay ◽  
...  
Keyword(s):  
Photocatalytic Performance ◽  
Organic Dyes ◽  
Uv Light ◽  
Light Irradiation ◽  
Tio2 Particles ◽  
Uv Light Irradiation

scholarly journals Effect of Various Additives on Photocatalytic Degradation of 4-Nitrophenol

2009 ◽  
Vol 6 (s1) ◽  
pp. S422-S428 ◽  
Author(s):  
Kashif Naeem ◽  
Feng Ouyang
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Degradation ◽  
Rice Husk ◽  
Uv Light ◽  
Aqueous Suspension ◽  
Degradation Efficiency ◽  
Optimal Amount ◽  
Supporting Materials ◽  
Better Than

The photocatalytic degradation of 4-nitrophenol (4-NP) assisted by titanium dioxide (TiO2) was investigated in aqueous suspension under irradiation by UV light. The effect of different supporting materials mixed physically with TiO2on the photocatalytic degradation of 4-NP has been studied. TiO2with all supports exhibits good degradation efficiency of 4-NP and was better than TiO2alone. The addition of SiO2and ZSM-5 only caused a little change in 4-NP degradation. However, degradation of 4-NP was improved from 34.89% to 60.53% within 120 min photocatalysis in the presence of optimal amount of AC. The degradation was also fairly enhanced in the presence of cheaper rice husk and the activity was closed to AC.

Preparation and Properties of Composite TiO2-HZSM-5 Used for Photocatalytic Degradation of Methyl Orange

2010 ◽  
Vol 26-28 ◽  
pp. 281-284
Author(s):  
Wen Jie Zhang ◽  
Yang Yu
Keyword(s):  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Pure Tio2 ◽  
Dispersion Method ◽  
Removal Rates ◽  
Tio2 Particles ◽  
Composite Photocatalysts ◽  
Photocatalytic Activities ◽  
Degradation Activity ◽  
Degradation Of Methyl Orange

Photocatalytic activities of TiO2-HZSM-5 composite photocatalysts prepared by solid-state dispersion method were investigated. TiO2 particles were well distributed on the surface of HZSM-5. Methyl orange removal rates increased with decreasing TiO2:HZSM-5 ratio from 10:1 to 1:50 in TiO2-HZSM-5 composites. Adsorption of methyl orange increased constantly with increasing amount of HZSM-5. Photocatalytic degradation activity was also noticeably enhanced up to 56% when using TiO2-HZSM-5 composite, resulting in 13% more removal compared with using pure TiO2. Composite photocatalysts calcinated at temperatures from 400 oC to 600 oC exhibited enhanced methyl orange removal abilities, and the optimum calcination temperature was 450 oC. After 70 min of irradiation, methyl orange removal rates were 99.1% and 86.5% when TiO2 concentrations of TiO2-HZSM-5 composite were 40 mg/l and 20 mg/l, respectively.

Photocatalytic Degradation Activity of TiO2 Nanotubes for Cr(VI)

2013 ◽  
Vol 864-867 ◽  
pp. 715-718 ◽  
Author(s):  
Xiang Qing Li ◽  
Zhen Hong ◽  
Shi Zhao Kang ◽  
Li Xia Qin ◽  
Guo Dong Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Calcination Temperature ◽  
Uv Light ◽  
Degradation Efficiency ◽  
Light Irradiation ◽  
Uv Light Irradiation ◽  
Degradation Activity ◽  
The Stability

TiO2 nanotubes were obtained by calcining at various temperatures. The influence of calcination temperature on the degradation activity of TiO2 nanotubes for Cr (VI) was investigated under UV light irradiation. It was found that the photocatalytic activity of TiO2 nanotubes calcinated at 350 °C was the highest. Furthermore, the photocatalytic activity of TiO2 nanotubes was higher than that of the P25 TiO2 nanoparticles. Importantly, the stability of TiO2 nanotubes for the degradation of Cr (VI) was high, and degradation efficiency can still reach 72.4% after 8 recycles. Consequently, a highly stable and active photocatalyst for degradation of Cr (VI) was achieved.

A PW12/Bi2WO6 composite photocatalyst for enhanced visible light photocatalytic degradation of organic dye pollutants

2019 ◽  
Vol 43 (8) ◽  
pp. 3469-3475 ◽  
Author(s):  
Gang Liu ◽  
Yuzhuo Zhang ◽  
Lin Xu ◽  
Bingbing Xu ◽  
Fengyan Li
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Photocatalytic Performance ◽  
Organic Dye ◽  
Composite Photocatalyst ◽  
Dye Pollutants ◽  
Visible Light Photocatalytic

Bi2WO6 and polyoxometalate nanocomposites exhibited superior photocatalytic performance for degradation of organic dye rhodamine B under visible light.

Comparison of the photocatalytic performance of TiO2/AC and TiO2/CNT nanocomposites for methyl orange photodegradation

2018 ◽  
Vol 78 (5) ◽  
pp. 1082-1093 ◽  
Author(s):  
Liping Wang ◽  
Jingru Guo ◽  
Jingjing Dang ◽  
Xiaojun Huang ◽  
Si Chen ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Removal Efficiency ◽  
Photoelectron Spectroscopy ◽  
Photocatalytic Performance ◽  
Chloride Ion ◽  
Degradation Efficiency ◽  
Ion Concentration ◽  
Nano Tio2 ◽  
Ultraviolet Wavelength ◽  
Nanotube Composites

Abstract To enhance the photocatalytic degradation efficiency of TiO2 on methyl orange (MO) removal, TiO2/AC (activated carbon) and TiO2/CNT (carbon nanotube) composites were synthesized. The prepared catalysts were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The photocatalytic performance of the obtained composites were investigated by the degradation of MO under UV irradiation (254 nm, 365 nm). The results revealed that the prepared nanocomposite showed higher MO degradation efficiency than pure nano-TiO2. Additionally, batch experiments of influencing factors, including H2O2 dosage, metal dopants, inorganic anions, chloride ion concentration and ultraviolet wavelength on the MO removal efficiency were also conducted. The results demonstrated that metal dopant and the presence of H2O2 significantly enhanced MO removal efficiency.

Additive SnO2-ZnO Composite Films for Photocatalytic Degradation Efficiency of Organic Dye

2016 ◽  
Vol 675-676 ◽  
pp. 205-208 ◽  
Author(s):  
Supphadate Sujinnapram ◽  
Sasimonton Moungsrijun
Keyword(s):  
Photocatalytic Degradation ◽  
Uv Light ◽  
Composite Films ◽  
Weight Ratio ◽  
Organic Dye ◽  
Degradation Efficiency ◽  
Zno Films ◽  
Eosin Y ◽  
Degradation Rate Constant ◽  
Glycol Solution

SnO2-ZnO composite films were employed as photocatalytic degradation of organic dye. SnO2 and ZnO were mixed in polyethylene glycol solution with various weight ratios of SnO2. The composite paste was screened onto glass substrate with active area of 1 cm2 and annealed at 400 °C. The photocatalytic activity of composite films for the degradation of Eosin-Y dye was investigated under UV light irradiation. It was found that the normalized absorbance of dye solution decreased after treatment indicated that dye molecules were reduced. The composite films showed better degradation efficiency than conventional ZnO films due to reduced recombination encourage longer reaction time of electron and hole with surrounded environment. The optimized weight ratio of 30% showed the highest degradation rate constant and the lowest half lift.

scholarly journals Imazalil sulphate pesticide degradation using silver loaded hollow anatase TiO2 under UV light irradiation

2016 ◽  
Vol 12 (2) ◽  
Author(s):  
Afrouz Baharvand ◽  
Rusmidah Ali ◽  
Hadi Nur
Keyword(s):  
Charge Separation ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
Aqueous Suspension ◽  
Anatase Tio2 ◽  
Tio2 Photocatalyst ◽  
Tio2 Particles ◽  
Photodegradation Efficiency ◽  
Uv Light Irradiation ◽  
Template Methods

Silver loaded hollow anatase TiO2 particles with the location of silver are inside (Ag@TiO2) and outside (Ag/TiO2) the hollow TiO2 structure have been successfully synthesized by a deposition-precipitation and template methods. The effects of silver nanoparticles location on Ag@TiO2 andAg@TiO2 has been evaluated in the photodegradation efficiency of imazalil sulphate pesticide in aqueous suspension under ultraviolet irradiation. The Ag/TiO2 showed better photocatalytic performance for the degradation of imazalil sulphate, compared to Ag@TiO2 and hollow TiO2 microspheres. A higher photocatalytic activity of Ag/TiO2 compared to Ag@TiO2 and hollow TiO2 can be considered as an evidence of enhanced charge separation of Ag/TiO2  photocatalyst as confirmed by photoluminescence spectroscopy.

Sign in / Sign up

Export Citation Format

Share Document