As-synthesized ZSM-5 zeolite as a suitable support for increasing the photoactivity of semiconductors in a typical photodegradation process

Ghahfarokhi, Zahra Shams; Nezamzadeh‐Ejhieh, Alireza

doi:10.1016/j.mssp.2015.05.022

Cited by 99 publications

(29 citation statements)

References 41 publications

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“…Firstly, dye molecules interact with the photocatalyst and are adsorbed onto its surface; then, the photodegradation of the dye commences. The overall efficiency of a photocatalysis system is closely dependent on operational parameters that dictate the adsorption and photodegradation of dye In addition, Shams-Ghahfarokhi et al reported the calculation of the φ value from the first-order rate constant of photodegradation process [15,46] using the following equation:…”

Section: Factors Influencing the Photodegradation Reactionmentioning

confidence: 99%

“…Thus, the adsorption of dye molecules becomes the limiting step at high temperatures. As a result, reaction temperatures between 20 and 80 • C [15] are considered as the desired temperature for the effective photodegradation of dye molecules.…”

Section: Reaction Temperaturementioning

confidence: 99%

“…These reactive species can quickly and non-selectively decompose organic pollutants. The whole photodegradation process, from the adsorption of dye molecules on the surface of the photocatalyst to the decomposition of dye molecules by reactive radicals, is affected by operational parameters such as the pH of solution, initial dye concentration, reaction temperature, and irradiation intensity [13][14][15][16][17]. For example, Neppolian et al reported that the degradation of reactive yellow 17, reactive red 2, and reactive blue 4 over Degussa P-25 followed pseudo first-order kinetics [14], in which increasing initial dye concentration depressed the photodegradation efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts

et al. 2019

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Due to its low cost, environmentally friendly process, and lack of secondary contamination, the photodegradation of dyes is regarded as a promising technology for industrial wastewater treatment. This technology demonstrates the light-enhanced generation of charge carriers and reactive radicals that non-selectively degrade various organic dyes into water, CO2, and other organic compounds via direct photodegradation or a sensitization-mediated degradation process. The overall efficiency of the photocatalysis system is closely dependent upon operational parameters that govern the adsorption and photodegradation of dye molecules, including the initial dye concentration, pH of the solution, temperature of the reaction medium, and light intensity. Additionally, the charge-carrier properties of the photocatalyst strongly affect the generation of reactive species in the heterogeneous photodegradation and thereby dictate the photodegradation efficiency. Herein, this comprehensive review discusses the pseudo kinetics and mechanisms of the photodegradation reactions. The operational factors affecting the photodegradation of either cationic or anionic dye molecules, as well as the charge-carrier properties of the photocatalyst, are also fully explored. By further analyzing past works to clarify key active species for photodegradation reactions and optimal conditions, this review provides helpful guidelines that can be applied to foster the development of efficient photodegradation systems.

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Section: Factors Influencing the Photodegradation Reactionmentioning

confidence: 99%

Section: Reaction Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts

et al. 2019

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“…When the La 2 Ti 2 O 7 sample obtained using 4 g of CTAB is used, ofloxacin molecules are not detectable after 120 min of irradiation in the solution since all the remaining ofloxacin molecules are degraded. According to Langmuir-Hinshelwood equation [39,40], r = -dc/dt = kθ = k(KC/(1+KC)), the first order reaction rate constants are 0.0128, 0.0187 and 0.0245 min -1 on the La 2 Ti 2 O 7 samples obtained using 0, 2 and 4 g of CTAB, respectively. La 2 Ti 2 O 7 dosage inofloxacin solution can influence both adsorption and photocatalytic degradation of ofloxacin molecules on the material, as presented in Fig.…”

Section: Photocatalytic Degradation Of Ofloxacinmentioning

confidence: 99%

Influences of cetyltrimethyl ammonium bromide template on photocatalytic degradation of ofloxacin on porous La2Ti2O7

Wang¹,

Zhang²,

Ma³

et al. 2019

Desalination and Water Treatment

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Porous La 2 Ti 2 O 7 photocatalyst was synthesized by sol-gel method using cetyltrimethyl ammonium bromide (CTAB) as the template. Ofloxacin degradation mechanism and the effects of CTAB on photocatalytic activity of the porous La 2 Ti 2 O 7 were examined. The addition of CTAB in preparation of La 2 Ti 2 O 7 can obviously enhance the activity of the material, and the first order reaction rate constants are 0.0128, 0.0187 and 0.0245 min-1 on the La 2 Ti 2 O 7 samples obtained using 0, 2 and 4 g of CTAB, respectively. Photocatalytic degradation efficiency is almost linearly enhanced with the increase of La 2 Ti 2 O 7 dosage in less than 300 mg/L. When the La 2 Ti 2 O 7 sample obtained using 4 g CTAB was used, total organic carbon in the solution is reduced from 20.9 mg/L to 5.1 mg/L after 120 min of irradiation. The functional groups in ofloxacin molecule are decomposed during photocatalytic oxidation, which are proven by the shrinking absorption intensities in both UV-Visible and FT-IR spectra. F-, NH 4 + and NO 2 ions in the solution continuously increase with extending irradiation time, showing the separation of fluoride ion and nitrogen from ofloxacin molecule.

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“…Therefore, developing light‐responsive photocatalysts for water treatment has aroused a lot of interest in past few years, such as simple oxides, sulfides, complex oxides and polymers . Among various semiconductors, Bismuth oxyhalides, especially the composites BiOI x Cl 1‐x , are gaining an increasing attention as promising visible light driven photocatalysts due to longer life time of charge carriers and higher redox abilities for pollutants degradation . However, inefficient adsorption and non‐selective degradation restrict the application of these semiconductor photocatalysts in some environmental cases.…”

Section: Introductionmentioning

confidence: 99%

Surface‐Engineered Hollow Polymer Spheres for Efficient Enrichment and Photodegradation of Aqueous Organic Wastes

et al. 2018

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To conquer the low light utilization efficiency of traditional photocatalysts-polymer composites with core-shell structure, and boost the adsorption efficiency of functional polymer in the composites. Photocatalysts surface-engineered hollow polymer spheres are successfully synthesized by a Pickering emulsion polymerization method for removal of organic pollutants from water. Batch experiments (phenol as a model molecular, BiOI 0.5 Cl 0.5 as a model photocatalysts) showed that the removal efficiency of photocatalysts surface-engineered hollow polymer spheres was higher than that of solid polymer spheres. The significant increase in removal efficiency suggests that photocatalysts surface-engineered hollow polymer spheres might serve as powerful agents in treating organics-polluted water.

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As-synthesized ZSM-5 zeolite as a suitable support for increasing the photoactivity of semiconductors in a typical photodegradation process

Cited by 99 publications

References 41 publications

Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts

Mechanistic Insights into Photodegradation of Organic Dyes Using Heterostructure Photocatalysts

Influences of cetyltrimethyl ammonium bromide template on photocatalytic degradation of ofloxacin on porous La2Ti2O7

Surface‐Engineered Hollow Polymer Spheres for Efficient Enrichment and Photodegradation of Aqueous Organic Wastes

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