Methylene blue photocatalytic degradation under visible irradiation on TiO2 thin films sensitized with Cu and Zn tetracarboxy-phthalocyanines

Vallejo, William; Díaz‐Uribe, Carlos; Cantillo, Álvaro

doi:10.1016/j.jphotochem.2014.11.009

Cited by 74 publications

(28 citation statements)

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“…Compound 4 shows an additional broad band located at 468 nm, this signal can be assigned to a second π‐ π*, this third Q band arises due to the generation of porphyrin dimmers. This behavior is reported also for phthalocyanins …”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of 5,10,15,20‐Tetrakis(4‐ethylphenyl)porphyrin and (Zn²⁺, Mn²⁺, Sn²⁺, Ni²⁺, Al³⁺, V³⁺)‐Derivatives: Photophysical and DFT study

et al. 2019

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A novel family of porphyrins based on 5,10,15,20‐Tetrakis(4‐ethylphenyl)porphyrin (1) and six metallo‐derivatives (Zn2+(2), Sn2+(3), Mn2+ (4), Ni2+ (5), Al3+ (6) and V3+ (7)) were synthesized via the Alder‐cols method (synthesis yield between 59%‐75%) and characterized through 1H‐ and 13C‐ NMR, MALDI‐TOF mass spectrometry and FT‐IR assay. Photophysical study was carried out by UV‐Vis and fluorescence spectrophotometry with the aim of assessing their potential as dye sensitizers for photodynamic therapy (PDT). In this regard, fluorescence quantum yield values are between 0.002‐0.38, being the macrocycle 3, the porphyrin with the highest fluorescence quantum yield while the derivative 7 showed the lowest value. Quantum chemical calculations were carried out to study the molecular structure of the porphyrins and to get insight of the luminescent process for 1, which is the free metal system and 3 which includes Sn2+ as metal center. Results indicated that the emissive states involve the transitions with LLCT character for 1, while for 3 it is ML–LCT. This fact evidenced the metal effects on their photophysical properties. Finally, optical and spectroscopic properties and besides, DFT study suggest that 3 could be used as sensitizer in photodynamic therapy applications.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of 5,10,15,20‐Tetrakis(4‐ethylphenyl)porphyrin and (Zn²⁺, Mn²⁺, Sn²⁺, Ni²⁺, Al³⁺, V³⁺)‐Derivatives: Photophysical and DFT study

et al. 2019

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“…Therefore, improving the photoresponse of ZnO to longer wavelengths of the electromagnetic spectrum is the goal to be achieved for photocatalytic applications under solar irradiation [7]. Different strategies have been reported to extend photoresponse of semiconductors into the visible light region: (a) sensitization with natural and synthetic dyes [8][9][10][11], (b) coupled semiconductors [12][13][14], (c) surface plasmon resonance [15][16][17][18], and (d) doping ZnO structure with metals and nonmetals [19][20][21]. Among these, the doping process can modify the band gap of ZnO, generating electronic state intragap inside of the semiconductor thus ensuring the photoactivity redshift; on that topic, different authors have reported that ZnO changed photoresponse after the doping process [22].…”

Section: Introductionmentioning

confidence: 99%

Methylene Blue Photodegradation under Visible Irradiation on Ag-Doped ZnO Thin Films

Vallejo

Cantillo

Díaz‐Uribe

2020

International Journal of Photoenergy

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This study synthesized and characterized Ag-doped ZnO thin films. Doped ZnO powders were synthesized using the sol-gel method, and thin films were fabricated using the doctor blade technique. The Ag content was determined by optical emission spectrometers with inductively coupled plasma (ICP plasma). Additionally, X-ray diffraction, Raman spectroscopy, Atomic Force Microscopy (AFM), diffuse reflectance, and X-ray photoelectron spectroscopy (XPS) measurements were used for physicochemical characterization. Finally, the photocatalytic degradation of methylene blue (MB) was studied under visible irradiation in aqueous solution. The Langmuir-Hinshelwood model was used to determine the reaction rate constant of the photocatalytic degradation. The physicochemical characterization showed that the samples were polycrystalline, and the diffraction signals corresponded to the ZnO wurtzite crystalline phase. Raman spectroscopy verified the ZnO doping process. The AFM analysis showed that roughness and grain size were reduced after the doping process. Furthermore, the optical results indicated that the presence of Ag improved the ZnO optical properties in the visible range, and the Ag-doped ZnO thin films had the lowest band gap value (2.95 eV). Finally, the photocatalytic degradation results indicated that the doping process enhanced the photocatalytic activity under visible irradiation, and the Ag-doped ZnO thin films had the highest MB photodegradation value (45.1%), as compared to that of the ZnO thin films (2.7%).

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“…The match of the energy difference between the oxidation potential of the excited sensitizer and conduction band of the TiO 2 acts as the driving force for the charge injection process (Vinodgopal et al, 1995). The sensitizer for TiO 2 materials can be any materials with a lower bandgap, including semiconductors, metals, and organic dyes (Vallejo et al, 2015, Cabir et al, 2017.…”

Section: Discussionmentioning

confidence: 99%

Photocatalytic cementitious material for self-cleaning and anti-microbial application

Hamdany¹

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First of all, the author would like to express his greatest gratitude to his supervisor, Assistant Professor Qian Shunzhi, not only for his invaluable supervision and advice but also for sharing his experiences, encouragement and motivation throughout the journey of his PhD program. The author owes his deepest gratitude to Dr Wei Li and Dr Ding Yuanzhao for their endless assistance and patience in guiding and helping the author on experimental design, chemical synthesis, microbiological related experiments, training for using equipment and report writing. The author would also like to extend his sincere gratitude to Nanyang Technological University for the NTU research scholarship. The author would like to thank all colleagues in his group (Weng Yiwei, Lu Bing, Liu Siyu, Dr Zhang Zhigang), Dr Martin Wijaya (CEE), Dr Ronny William (SPMS), and Dr Namyo Salim (CEE) for their comments and helpful discussion. The author also would like to thank all of PhD students in Prof Chen Yuan's group, Mr Cheng from CT Lab, Mr Phua from CT Lab, Ms Lim, Han Khiang from Environmental Lab and technicians that have not been mentioned for all the helps and friendship through these years. Finally, the author would like to express his utmost gratitude to his family who has given continuous moral support and encouragement to the author. Chapter 4. Graphene-based TiO 2 nanocomposites for enhanced visible light degradation of organic dye and antibacterial effect of Escherichia coli 53 4.

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Methylene blue photocatalytic degradation under visible irradiation on TiO2 thin films sensitized with Cu and Zn tetracarboxy-phthalocyanines

Cited by 74 publications

References 49 publications

Synthesis and Characterization of 5,10,15,20‐Tetrakis(4‐ethylphenyl)porphyrin and (Zn²⁺, Mn²⁺, Sn²⁺, Ni²⁺, Al³⁺, V³⁺)‐Derivatives: Photophysical and DFT study

Synthesis and Characterization of 5,10,15,20‐Tetrakis(4‐ethylphenyl)porphyrin and (Zn²⁺, Mn²⁺, Sn²⁺, Ni²⁺, Al³⁺, V³⁺)‐Derivatives: Photophysical and DFT study

Methylene Blue Photodegradation under Visible Irradiation on Ag-Doped ZnO Thin Films

Photocatalytic cementitious material for self-cleaning and anti-microbial application

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Methylene blue photocatalytic degradation under visible irradiation on TiO2 thin films sensitized with Cu and Zn tetracarboxy-phthalocyanines

Cited by 74 publications

References 49 publications

Synthesis and Characterization of 5,10,15,20‐Tetrakis(4‐ethylphenyl)porphyrin and (Zn2+, Mn2+, Sn2+, Ni2+, Al3+, V3+)‐Derivatives: Photophysical and DFT study

Synthesis and Characterization of 5,10,15,20‐Tetrakis(4‐ethylphenyl)porphyrin and (Zn2+, Mn2+, Sn2+, Ni2+, Al3+, V3+)‐Derivatives: Photophysical and DFT study

Methylene Blue Photodegradation under Visible Irradiation on Ag-Doped ZnO Thin Films

Photocatalytic cementitious material for self-cleaning and anti-microbial application

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Synthesis and Characterization of 5,10,15,20‐Tetrakis(4‐ethylphenyl)porphyrin and (Zn²⁺, Mn²⁺, Sn²⁺, Ni²⁺, Al³⁺, V³⁺)‐Derivatives: Photophysical and DFT study

Synthesis and Characterization of 5,10,15,20‐Tetrakis(4‐ethylphenyl)porphyrin and (Zn²⁺, Mn²⁺, Sn²⁺, Ni²⁺, Al³⁺, V³⁺)‐Derivatives: Photophysical and DFT study