Synthesis, characterization, photocatalytic and antibacterial activities of Ag-doped ZnO powders modified with a diblock copolymer

Amornpitoksuk, Pongsaton; Suwanboon, Sumetha; Sangkanu, Suthinee; Sukhoom, Ampaitip; Muensit, Nantakan; Baltrušaitis, Jonas

doi:10.1016/j.powtec.2011.12.032

Cited by 118 publications

(44 citation statements)

References 42 publications

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“…We used a custom-designed Kratos Axis Ultra XPS system (Kratos Analytical, Chestnut Ridge, NY, USA) as previously described by Baltrusaitis et al (2007). Briefly, high-resolution spectra were acquired in the region of interest using the experimental parameters as described by Amornpitoksuk et al (2012). Samples containing particles were mounted on indium foil.…”

Section: Methodsmentioning

confidence: 99%

Effects of Eyjafjallajökull Volcanic Ash on Innate Immune System Responses and Bacterial Growth in Vitro

Monick

Baltrušaitis²,

Powers

et al. 2013

Environ Health Perspect

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Background: On 20 March 2010, the Icelandic volcano Eyjafjallajökull erupted for the first time in 190 years. Despite many epidemiological reports showing effects of volcanic ash on the respiratory system, there are limited data evaluating cellular mechanisms involved in the response to ash. Epidemiological studies have observed an increase in respiratory infections in subjects and populations exposed to volcanic eruptions.Methods: We physicochemically characterized volcanic ash, finding various sizes of particles, as well as the presence of several transition metals, including iron. We examined the effect of Eyjafjallajökull ash on primary rat alveolar epithelial cells and human airway epithelial cells (20–100 µg/cm2), primary rat and human alveolar macrophages (5–20 µg/cm2), and Pseudomonas aeruginosa (PAO1) growth (3 µg/104 bacteria).Results: Volcanic ash had minimal effect on alveolar and airway epithelial cell integrity. In alveolar macrophages, volcanic ash disrupted pathogen-killing and inflammatory responses. In in vitro bacterial growth models, volcanic ash increased bacterial replication and decreased bacterial killing by antimicrobial peptides.Conclusions: These results provide potential biological plausibility for epidemiological data that show an association between air pollution exposure and the development of respiratory infections. These data suggest that volcanic ash exposure, while not seriously compromising lung cell function, may be able to impair innate immunity responses in exposed individuals.

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Section: Methodsmentioning

confidence: 99%

Effects of Eyjafjallajökull Volcanic Ash on Innate Immune System Responses and Bacterial Growth in Vitro

Monick

Baltrušaitis²,

Powers

et al. 2013

Environ Health Perspect

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“…Noting that the peak position of (101) reflection peak had shifted toward lower values as the Ag dopant increases. The shift might be due to the partial substitution of Ag + in the ZnO lattice and causes the increases of lattice constant a and c [5,6]. This occurred probably related to the differentiation of ionic radii between Ag + and Zn 2+ ions which 1.22 Å and 0.74 Å, respectively.…”

Section: Resultsmentioning

confidence: 99%

PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE WITH SILVER DOPED ZnO NANOPARTICLES GROWN ON MICROSCOPIC SAND PARTICLES

2018

MJAS

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Pure and Ag doped ZnO nanoparticles were synthesized on microscopic sand particles by sol-gel method. Silver nitrate was used as the doping precursor, Ag doping levels of 1.3 to 7.7 of Ag/Zn ratios were obtained based on energy dispersive X-ray spectroscopy analysis. X-ray diffraction results show that a ZnO (101) peak of Ag doped samples are shifted towards lower degree which around 0.17 o compared to pure ZnO NPs, indicating the existence of doping in the Ag doped samples. The pure and Ag doped ZnO samples were used as photocatalysts in the degradation of methylene blue under UV irradiation. Photodegradation efficiency based on the pseudo-first kinetics model gave measured values of the photodegradation rate, k of 8. 9, 11.8, 12.7, 14.8 and 17.4 x 10 -3 min -1 for pure, 1.3, 1.6, 1.7 and 2.4 of Ag/Zn ratios, respectively. At higher doping levels of 3.3 and 7.7 of Ag/Zn ratios, the k values receded to 12.7 and 12.0 x 10 -3 min -1 , respectively. The increasing trend on k values can be due to the doping defect levels which trapped the recombining electrons, thus lengthening the lifetime of the electron hole pairs. Keywords: photocatalysis, Ag doped ZnO, nanoparticlesAbstrak Nanopartikel ZnO tulen dan nanopartikel ZnO yang didopkan dengan perak (Ag) telah disintesiskan di atas pasir bersaiz mikro menggunakan kaedah sol-gel. Argentum nitrat digunakan sebagai sumber Ag, dapatan tahap pendopan adalah 1.3 sehingga 7.7 nisbah Ag kepada Zn (Ag/Zn). Berdasarkan keputusan spektroskopi sinar-X, terdapat peralihan kedudukan puncak ZnO (101) sebanyak 0.17 o jika dibandingkan antara ZnO tulen dan sampel ZnO yang didopkan dengan Ag. Ini menunjukkan berlaku pendopan di dalam sampel nanopartikel ZnO yang didopkan dengan Ag. Semua sampel diuji sebagai fotomangkin di dalam degradasi metilena biru di bawah sinar UV. Kecekapan degradasi dikira menggunakan model kinetik pseudo-pertama dan memberikan nilai kadar degradasi, k iaitu masing-masing 8.9, 11.8, 12.7, 14.8 dan 17.4 x 10 -3 min -1 untuk sampel ZnO tulen, 1.3, 1.6, 1.7 dan 2.4 untuk nisbah Ag/Zn. Pada tahap pendopan yang tinggi iaitu 3.3 dan 7.7 Ag/Zn, nilai k berkurangan kepada 12.7 dan 12.0 x 10 -3 min -1 . Peningkatan nilai k adalah disebabkan oleh kesan pendopan di mana elektron terperangkap untuk pergabungan semula dan memangjangkan jangka hayat pasangan elektron dan lubang.Kata kunci: fotomangkin, perak didopkan ZnO, nanopartikel ISSN -2506 Nur Azmina et al: PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE WITH SILVER DOPED ZnO NANOPARTICLES GROWN ON MICROSCOPIC SAND PARTICLES 271Introduction Since 1972, the capability of ZnO in the degradation of wastewater has been studied [1]. Due to its remarkable features which has wide band gap (3.37 eV) at room temperature and high exciton binding energy of approximately 60 meV has made ZnO as a perfect candidate in photocatalyst application. To achieve high photocatalytic degradation efficiency of wastewater, ZnO photocatalyst must offer large specific surface area and a high efficiency for segregation photogenerated electro...

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“…Photocatalysis process is a promising and efficient approach for the removal of water pollutants . The photo‐induced degradation of organic pollutants and microbes for the treatment of water has been performed by many researchers . Various promising photocatalysts like TiO 2 , ZnO etc have been investigated either in powder form or in the form of films or coatings on some substrate .…”

Section: Introductionmentioning

confidence: 99%

Transparent CaF₂ surface crystallized CaO–2B₂O₃ glass possessing efficient photocatalytic and antibacterial properties

2019

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This study aims to fabricate surface crystallized transparent calcium borate glass (CaO–2B2O3) for photocatalytic and antibacterial applications. The CaO–2B2O3 glass was fabricated by using the conventional melt‐quenching technique. Instead of using traditional high temperature and longer soaking time heat‐treatment, the acid etching method was adopted to get surface crystallization. Surface etching of as‐quenched glass was performed at room temperature by using three different concentrations of hydrogen fluoride in order to attain the different amount of calcium fluoride crystals at the surface. The characterization of surface crystallized glass was performed with an X‐ray diffraction pattern and scanning electron microscope‐EDS mapping system. Sufficient transparency (65%) was retained even at highest crystallization of glass surface. Surface crystallization with CaF2 induces hydrophilicity and photocatalytic character in glasses which was evaluated with contact angle measurements and smart resazurin (Rz) ink test. Around 68% of methylene blue (MB) dye degradation was also displayed by the crystallized glass. Crystallized glasses portrayed good antibacterial property against Escherichia coli (gram‐negative bacteria). Ninety‐nine per cent of bacterial depletion was recorded in 3 hours exposure time with surface crystallized glass without any external intervention. Interesting morphological changes were observed in bacterial shape and physical appearance under field emission scanning electron microscope after exposure to crystallized glasses.

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Synthesis, characterization, photocatalytic and antibacterial activities of Ag-doped ZnO powders modified with a diblock copolymer

Cited by 118 publications

References 42 publications

Effects of Eyjafjallajökull Volcanic Ash on Innate Immune System Responses and Bacterial Growth in Vitro

Effects of Eyjafjallajökull Volcanic Ash on Innate Immune System Responses and Bacterial Growth in Vitro

PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE WITH SILVER DOPED ZnO NANOPARTICLES GROWN ON MICROSCOPIC SAND PARTICLES

Transparent CaF₂ surface crystallized CaO–2B₂O₃ glass possessing efficient photocatalytic and antibacterial properties

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Synthesis, characterization, photocatalytic and antibacterial activities of Ag-doped ZnO powders modified with a diblock copolymer

Cited by 118 publications

References 42 publications

Effects of Eyjafjallajökull Volcanic Ash on Innate Immune System Responses and Bacterial Growth in Vitro

Effects of Eyjafjallajökull Volcanic Ash on Innate Immune System Responses and Bacterial Growth in Vitro

PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE WITH SILVER DOPED ZnO NANOPARTICLES GROWN ON MICROSCOPIC SAND PARTICLES

Transparent CaF2 surface crystallized CaO–2B2O3 glass possessing efficient photocatalytic and antibacterial properties

Contact Info

Product

Resources

About

Transparent CaF₂ surface crystallized CaO–2B₂O₃ glass possessing efficient photocatalytic and antibacterial properties