scholarly journals Effect of heat treatment under vacuum on structure and visible-light photocatalytic activity of nano-TiO2

RSC Advances ◽  
2019 ◽  
Vol 9 (56) ◽  
pp. 32691-32698
Author(s):  
Zhengyuan Gao ◽  
Pengfei Sun ◽  
Yiliu Fang ◽  
Chuanqiang Li ◽  
Xiaoya Yuan ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Visible Light ◽  
High Catalytic Activity ◽  
Nano Tio2 ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

Nano-TiO2 is known as a photocatalyst with high catalytic activity.

PHOTOCATALYTIC AND ANTIBACTERIAL ACTIVITY OF TITANIUM, FLUORINE AND SILVER CO-SUBSTITUTED HYDROXYAPATITE

2013 ◽  
Vol 22 ◽  
pp. 268-277 ◽  
Author(s):  
M. SANDHYARANI ◽  
N. RAMESHBABU ◽  
K. VENKATESWARLU ◽  
K. V. RAVISANKAR ◽  
M. ASHOK ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Heat Treatment ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Crystal Size ◽  
Potential Candidate ◽  
Visible Light Photocatalytic Activity ◽  
Heat Treated Condition ◽  
Visible Light Photocatalytic

Synthetic hydroxyapatite (HA), an analogue of the mineral component of bone tissue has been widely used in medicine as bone replacing material. To impart specific properties, HA can be chemically modified by anionic and cationic substitutions during synthesis. Thus the present study was focused in synthesizing nanocrystalline Ti , Ag and F co-substituted HA by microwave synthesis. The prepared powders were characterized by XRD and FTIR for their crystal size, cystallinity and functional groups respectively. XRD spectra reveal that crystal size of prepared powders was in the range of 21–25 nm in as synthesized condition and 45–51 nm in 900 ˚C heat-treated condition. Complete decomposition of HA to tri calcium phosphate was observed for Ti substituted HA powder after heat-treatment. Addition of F improved the thermal stability of Ti substituted HA as indicated by predominant phase of HA after heat-treatment. The photocatalytic activity of co-substituted HA powders was examined by degradation of methylene blue (5 × 10−5 M concentration) under visible light irradiation and the results were compared with pure HA . The degradation efficiency of co-substituted HA with respect to methylene blue was twice as high as that of pure HA. Ti and Ag has improved the visible light photocatalytic activity of HA, further F co-substitution has not affected the photocatalytic activity of substituted HA. The antibacterial effect of prepared powders was observed against 1 × 105 cells/mL of Escherichia coli using spread plate method at 24 h incubation period. Ag co-substituted HA showed complete inhibition of growth of Escherichia coli. Thus, among Ti , Ti-F , Ti-F-Ag substituted HA powders, Ti-F-Ag co-substituted HA with excellent visible light photocatalytic activity and anti-bacterial property is expected to be a potential candidate for biomedical applications.

Self-induced Synthesis under Neutral Conditions and Novel Visible Light Photocatalytic Activity of Ag4V2O7 Polyoxometalate

2021 ◽  
Author(s):  
Dan Zhou ◽  
Yi-Xiang Chen ◽  
Xiao-Yu Yuan ◽  
Yi Lu ◽  
Min Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Visible Light ◽  
Antibiotic Residues ◽  
Visible Light Photocatalytic Activity ◽  
Neutral Conditions ◽  
Visible Light Photocatalytic

The bifunction of strong proton acidity and oxidation renders polyoxometalates (POMs) of great potential in catalysis. Utilizing its excellent catalytic activity to tackle antibiotic residues in water is meaningful but...

Preparation of phenyl group functionalized g-C3N4 nanosheets with extended electron delocalization for enhanced visible-light photocatalytic activity

2018 ◽  
Vol 42 (9) ◽  
pp. 6756-6762 ◽  
Author(s):  
Yunfeng Li ◽  
Renxi Jin ◽  
Gaijuan Li ◽  
Xianchun Liu ◽  
Min Yu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Visible Light ◽  
Phenyl Group ◽  
Electron Delocalization ◽  
Conjugation System ◽  
Visible Light Photocatalytic Activity ◽  
Separation Rate ◽  
Light Utilization ◽  
Visible Light Photocatalytic

Phenyl group functionalized g-C3N4 shows an improved light utilization and charges separation rate due to extended conjugation system, leading to a superior catalytic activity in a variety of photocatalytic systems.

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