Photocatalytic reaction and degradation of methylene blue on TiO2 nano-sized particles

Dariani, R.S.; Esmaeili, Abbas Ali; Mortezaali, A.; Dehghanpour, Saeed

doi:10.1016/j.ijleo.2016.04.026

Cited by 308 publications

(131 citation statements)

References 17 publications

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“…Apparent photonic efficiency, or photonic efficiency, is one of the important parameters to evaluate the performance of a photocatalytic reactor, which is defined as Equation :

η = \frac{m o l e c u l e s c o n v e r t e d}{p h o t o n s i n c i d e n t}

where η is the photonic efficiency (in mole pollutant /Einstein, or %); the molecule conversion can be defined as moles reacted, which is usually taken from the reaction rate when half of the concentration is degraded . One Einstein (or Einstein unit) is the energy per mole of photons carried by a beam of monochromatic light…”

Section: Resultsmentioning

confidence: 99%

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A corrugated plate photocatalytic reactor for degradation of waterborne organic contaminants

et al. 2019

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A UV‐C/titanium dioxide (TiO2) plate coated photocatalytic reactor using a corrugated frame system was designed for water borne organic contaminant degradation. The anticipated advantages of using the corrugated layout include a larger photocatalytic surface area per unit volume and improved photocatalytic activity. The water distribution system was designed to assist effective interactions among the water pollutant, photocatalyst, and photons. The degradation of a methylene blue solution, as a model water contaminant, was carried out at room temperature (22 °C) at different concentrations and flowrates. With an 11 mg/L methylene blue solution, 70 % was degraded within the first 10 min using TiO2 coated corrugated plates, whereas under the same conditions the degradation rate was only 12 % for a corrugated reactor without a catalyst coating, and 4 % for a no‐plate reactor. The methylene blue degradation was described by the Langmuir‐Hinshelwood model, and the apparent photonic efficiency of the corrugated arrangement was found to be in the range of 1.53–2.83 % when half the initial concentration was degraded. The local area specific rate of energy absorption (LASREA) profile over the plates was determined from a model developed based on UV‐C light irradiation distribution and plate configuration. Light intensity measurements were carried out and were found to correlate with this model. A set of corrugated plate photocatalytic reactors with different geometries, but with the same coated area, were then analyzed and absorbed UV light intensities were integrated to determine the best geometry.

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“…Apparent photonic efficiency, or photonic efficiency, is one of the important parameters to evaluate the performance of a photocatalytic reactor, which is defined as Equation :

η = \frac{m o l e c u l e s c o n v e r t e d}{p h o t o n s i n c i d e n t}

Section: Resultsmentioning

confidence: 99%

“…Apparent photonic efficiency, or photonic efficiency, is one of the important parameters to evaluate the performance of a photocatalytic reactor, which is defined as Equation (20): [24,25,39]…”

Section: Reactor Performancementioning

confidence: 99%

A corrugated plate photocatalytic reactor for degradation of waterborne organic contaminants

et al. 2019

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“…This is expedited by the functionalized hydrophilic 3ZT-CO. Apart from that, the larger amorphous region in the composite accelerate the ROS release, thus oxidizing the MB molecules and decompose them to benzenes ring compounds. Upon complete oxidation, these compounds will eventually convert to water and carbon dioxide [43].…”

Section: Investigation On Chemical Crystallinity and Particle Distrmentioning

confidence: 99%

Coupled Oxides/LLDPE Composites for Textile Effluent Treatment: Effect of Neem and PVA Stabilization

et al. 2020

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The polyvinyl alcohol (PVA) and neem extract were grafted onto coupled oxides (3ZT-CO) via reflux process to stabilize the particles to form 3ZT-CO/PVA and 3ZT-CO/Neem. These were then incorporated into LLDPE by melt blending process to give LLDPE/3ZT-CO/PVA and LLDPE/3ZT-CO/Neem composites. The Neem and PVA stabilized particles showed high zeta potential and dispersed homogeneously in water. The stabilization process altered the shape of the particles due to plane growth along the (002) polar direction. The stabilizers acted as capping agents and initiated the one-dimensional growth. The alkyl chain groups from PVA increased the polarity of the LLDPE/3ZT-CO/PVA and played a dominant role in the water adsorption process to activate the photocatalytic activity. This was further enhanced by the homogeneous distribution of the particles and low degree of crystallinity (20.87%) of the LLDPE composites. LLDPE/3ZT-CO/PVA exhibited the highest photodegradation (93.95%), which was better than the non-stabilized particles. Therefore, the photocatalytic activity of a polymer composite can be enhanced by grafting PVA and neem onto couple oxides. The LLDPE/3ZT-CO/PVA composite was further used to treat textile effluent. The results showed the composite was able to remove dye color by 93.95% and to reduce biochemical oxygen demand (BOD) and chemical oxygen demand (COD) by 99.99%.

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“…Coated plates were inspected with a scanning electron microscope (SEM), atomic force microscope (AFM), and x‐ray diffractometer (XRD), as well as by band gap, adhesion, and water friction tests. A flow‐through photocatalytic reactor system was set up to test the performance of the coated plates with a model compound methylene blue (MB) solution, which has a stable molecular structure, and is often used in photocatalytic material and reactor tests …”

Section: Introductionmentioning

confidence: 99%

TiO₂ based nanopowder coatings over stainless steel plates for UV‐C photocatalytic degradation of methylene blue

et al. 2019

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Immobilizing the photocatalyst in a water treatment process design is essential; however, the immobilization method may affect the photoactivity of the photocatalyst. In this work, photocatalyst powders were successfully coated on 316 L stainless steel plates by a novel brush coating method. Three combinations of photocatalyst mixtures (pure TiO 2 anatase, anatase doped with WO 3 , or TiO 2 rutile) were and annealed at different temperatures between 460-540 C. The~10 μm thick coatings demonstrated full plate coverage and strong adhesion and adequate durability. Surface roughness increased with annealing temperature. The doping and annealing process enabled band gap reduction to the visible light spectrum for all coatings, with the smallest band gap being 2.48 eV (1 eV = 1.6 × 10 −19 J). Subsequent methylene blue degradation tests under UV-C showed that the coatings annealed in 460 C exhibited the best performance and with the highest degradation rate constant of 5.59 hours −1 . K E Y W O R D Sadvanced oxidation process, annealing, band gap, photocatalyst coatings, roughness

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Photocatalytic reaction and degradation of methylene blue on TiO2 nano-sized particles

Cited by 308 publications

References 17 publications

A corrugated plate photocatalytic reactor for degradation of waterborne organic contaminants

A corrugated plate photocatalytic reactor for degradation of waterborne organic contaminants

Coupled Oxides/LLDPE Composites for Textile Effluent Treatment: Effect of Neem and PVA Stabilization

TiO₂ based nanopowder coatings over stainless steel plates for UV‐C photocatalytic degradation of methylene blue

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Photocatalytic reaction and degradation of methylene blue on TiO2 nano-sized particles

Cited by 308 publications

References 17 publications

A corrugated plate photocatalytic reactor for degradation of waterborne organic contaminants

A corrugated plate photocatalytic reactor for degradation of waterborne organic contaminants

Coupled Oxides/LLDPE Composites for Textile Effluent Treatment: Effect of Neem and PVA Stabilization

TiO2 based nanopowder coatings over stainless steel plates for UV‐C photocatalytic degradation of methylene blue

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TiO₂ based nanopowder coatings over stainless steel plates for UV‐C photocatalytic degradation of methylene blue