Impact of natural organic matter on the degradation of 2,4-dichlorophenoxy acetic acid in a fluidized bed photocatalytic reactor

Rezaei, Reza; Mohseni, Madjid

doi:10.1016/j.cej.2016.05.086

Cited by 37 publications

(4 citation statements)

References 31 publications

(38 reference statements)

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“…The light source in fluidized-bed photoreactors can be placed at the center of the reactor or at the reactor walls, adopting either tubular UV lamps or LED lights [38,39] (Figure 1).…”

Section: Reactor Designmentioning

confidence: 99%

Toward Scaling-Up Photocatalytic Process for Multiphase Environmental Applications

et al. 2021

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Recently, we have witnessed a booming development of composites and multi-dopant metal oxides to be employed as novel photocatalysts. Yet the practical application of photocatalysis for environmental purposes is still elusive. Concerns about the unknown fate and toxicity of nanoparticles, unsatisfactory performance in real conditions, mass transfer limitations and durability issues have so far discouraged investments in full-scale applications of photocatalysis. Herein, we provide a critical overview of the main challenges that are limiting large-scale application of photocatalysis in air and water/wastewater purification. We then discuss the main approaches reported in the literature to tackle these shortcomings, such as the design of photocatalytic reactors that retain the photocatalyst, the study of degradation of micropollutants in different water matrices, and the development of gas-phase reactors with optimized contact time and irradiation. Furthermore, we provide a critical analysis of research–practice gaps such as treatment of real water and air samples, degradation of pollutants with actual environmental concentrations, photocatalyst deactivation, and cost and environmental life-cycle assessment.

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“…The light source in fluidized-bed photoreactors can be placed at the center of the reactor or at the reactor walls, adopting either tubular UV lamps or LED lights [38,39] (Figure 1).…”

Section: Reactor Designmentioning

confidence: 99%

Toward Scaling-Up Photocatalytic Process for Multiphase Environmental Applications

et al. 2021

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“…First, the yield of oxidative species, such as photogenerated holes and reactive oxygen species (ROS), is severely restricted by the inherent photogenerated electron-hole recombination inside the photocatalyst [22][23][24]. Second, owing to a short lifetime and non-selectivity, ROS are readily quenched by complex background constituents, such as anions, cations, or natural organic matter [25][26][27]. Thus, only a minority of photogenerated ROS contributed to the eventual degradation of target pollutants [14,19].…”

Section: Introductionmentioning

confidence: 99%

Use of Natural Zeolite Clinoptilolite in the Preparation of Photocatalysts and Its Role in Photocatalytic Activity

Pavlović,

Rajić

2024

Minerals

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The use of natural zeolite clinoptilolite in preparing photocatalysts and its function in photocatalysis are discussed in this review. The importance of advanced oxidation processes (AOPs) and the potential of heterogeneous photocatalysis in removing environmental pollutants are emphasized. The review focuses on the synergistic effects of clinoptilolite with semiconductors (TiO2, ZnO, CuO, SnO2, and NiO) to prepare stable and active photocatalysts, highlighting recent advancements in this field. It explores clinoptilolite’s structural characteristics, highlighting its microporous nature, adaptable framework, and improved textural properties due to acid and alkali treatments. Particle size, crystal phase, and calcination temperature are three key synthesis parameters that affect photocatalytic activity and are highlighted in the discussion of these parameters and their methods. A discussion is held regarding the processes and mechanisms of photocatalytic degradation of different organic compounds under varying irradiation conditions, including UV, visible, and ambient sunlight. Clinoptilolite is vital in improving supported semiconductor oxides’ photocatalytic efficiencies, which aid in pollutant degradation and environmental remediation.

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“…However, most studies have concentrated on the treatment mechanism of synthetic solutions utilizing UV/H 2 O 2 or UV/ PMS, with only a few examining the treatment of actual wastewater (Amanollahi et al 2021;Cibati et al 2022). Various components in water can interfere with the degradation of pollutants by UV irradiation and free radicals, resulting in lower removal efficiencies (Rezaei & Mohseni 2017;Shi et al 2022). According to Cibati et al (2022), the complexity of the wastewater matrix had a negative effect on the UV process, which resulted in a COD removal rate of just 17% in pharmaceutical industry wastewater as opposed to more than 80% in prepared water.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of UV/H2O2 and UV/PMS processes for treating pulp and paper wastewater

Wang

Fei

Gong

et al. 2022

Water Science and Technology

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Pulp and paper wastewater (PPWW) contains numerous refractory and harmful contaminants that require advanced treatment to meet the discharge criteria. This study compared the efficacy of two PPWW treatments: ultraviolet/peroxymonosulfate (UV/PMS) and ultraviolet/H2O2 (UV/H2O2) working under similar circumstances. The initial pH value, oxidant dosage, UV radiation intensity, and pseudo-first-order constant kobs were systematically studied in both systems. Optimally, the UV/PMS process produced an effluent of higher quality than the UV/H2O2, as measured by the removal efficiencies of chemical oxygen demand (COD) in 60 min, which were 48.2% and 64.3% for the respective UV/H2O2 and UV/PMS processes and corresponding kobs values of 0.0102 and 0.0159 min−1, respectively. Radical scavenging experiments demonstrated that •OH was the primary reactive oxygen species in UV/H2O2 process, while •OH and SO4−• in UV/PMS process. Moreover, ultraviolet-visible spectroscopy and gas chromatography coupled mass spectroscopy analyses showed that deep treatment of petroleum hydrocarbons with carbon chain lengths greater than 18 and macromolecular semi-volatile organic compounds in paper wastewater is difficult, whereas the UV/PMS process can significantly improve the removal of amides, esters, phenols, and other aromatic compounds.

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Impact of natural organic matter on the degradation of 2,4-dichlorophenoxy acetic acid in a fluidized bed photocatalytic reactor

Cited by 37 publications

References 31 publications

Toward Scaling-Up Photocatalytic Process for Multiphase Environmental Applications

Toward Scaling-Up Photocatalytic Process for Multiphase Environmental Applications

Use of Natural Zeolite Clinoptilolite in the Preparation of Photocatalysts and Its Role in Photocatalytic Activity

Comparative study of UV/H2O2 and UV/PMS processes for treating pulp and paper wastewater

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