Photocatalytic removal of 4-chlorophenol present in water using ZrO2/LDH under UV light source

Melchor-Lagar, Verenice; Ramos-Ramírez, Esthela; Morales-Pérez, Ariadna-Alicia; Rangel-Vázquez, I.; Angel, G. Del

doi:10.1016/j.jphotochem.2019.112251

Cited by 27 publications

(10 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the U.S. Environmental Protection Agency (EPA) has listed most chlorinated organic compounds as priority pollutants . Various physical, chemical, and biological methods have been proposed to remove chlorinated organic pollutants from the environment . However, chlorinated organic pollutants are toxic to microorganisms, and their incomplete oxidation typically generates highly toxic intermediate products .…”

Section: Introductionmentioning

confidence: 85%

“…4 Various physical, chemical, and biological methods have been proposed to remove chlorinated organic pollutants from the environment. 5 However, chlorinated organic pollutants are toxic to microorganisms, and their incomplete oxidation typically generates highly toxic intermediate products. 6 Therefore, an efficient and eco-friendly technology is required to completely remove chlorinated organic pollutants.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Chlorinated Pollutant Degradation by the Synergistic Effect between Dechlorination and Hydroxyl Radical Oxidation on a Bimetallic Single-Atom Catalyst

Zhao

Quan

et al. 2021

Environ. Sci. Technol.

107

View full text Add to dashboard Cite

Chlorinated organic pollutants are highly toxic and widespread in the environment, which cause ecological risk and threaten the human health. Chlorinated pollutants are difficult to degrade and mineralize by the conventional advanced oxidation process as the C–Cl bond is resistant to reactive oxygen species oxidation. Herein, we designed a bifunctional Fe/Cu bimetallic single-atom catalyst anchored on N-doped porous carbon (FeCuSA-NPC) for the electro-Fenton process, in which chlorinated pollutants are dechlorinated on single-atom Cu and subsequently oxidized by the ·OH radical produced from O2 conversion on single-atom Fe. Benefitting from the synergistic effect between dechlorination on single-atom Cu and ·OH oxidation on single-atom Fe, the chlorinated organic pollutants can be efficiently degraded and mineralized. The mass activity for chlorinated organic pollutant degradation by FeCuSA-NPC is 545.1–1374 min–1 gmetal –1, excessing the highest value of the reported electrocatalyst. Moreover, FeCuSA-NPC is demonstrated to be pH-universal, long-term stable, and environment friendly. This work provides a new insight into the rational design of a bifunctional electrocatalyst for efficient removal of chlorinated organic pollutants.

show abstract

Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Enhanced Chlorinated Pollutant Degradation by the Synergistic Effect between Dechlorination and Hydroxyl Radical Oxidation on a Bimetallic Single-Atom Catalyst

Zhao

Quan

et al. 2021

Environ. Sci. Technol.

107

View full text Add to dashboard Cite

show abstract

“…The photodegradation of chemicals and pharmaceuticals mediated by nanostructured metal oxide semiconductors relies on the generation of HO• through water oxidation at the material surface [7][8][9][10][11][12][13] . Aiming to compare the reactivity of salicylic acid and paracetamol with HO• in the absence of the semiconductors, the degradation of the compounds was evaluated using H 2 O 2 /hν as a source of HO•.…”

Section: Resultsmentioning

confidence: 99%

“…The decomposition is provoked by intensive oxidation via reactive oxygen species (ROS) produced by the interaction of the photoexcited semiconductor with water. Among the ROS produced in the process, hydroxyl radical (HO•) has been argued as the most effective one, being responsible by hydrogen abstraction and/or direct electrophilic attack on aromatic moieties, which are usually present in the pollutants and pharmaceuticals [7][8][9][10][11][12][13] . After that, a cascade of oxidative reactions takes place leading to partial or total mineralization of the chemicals.…”

Section: Introductionmentioning

confidence: 99%

Salicylic Acid Boosts the TiO2 and ZnO-Mediated Photodegradation of Paracetamol

et al. 2021

View full text Add to dashboard Cite

Titanium dioxide (TiO 2 ) and zinc oxide (ZnO) are among the most used catalysts in photodegradation. Paracetamol and salicylic acid are widely used as pharmaceutical drugs. We found that paracetamol is less susceptible to photodegradation compared to salicylic acid. From a chemical perspective, this was not expected since paracetamol is more vulnerable to chemical oxidation. Aiming the comprehension of this phenomenon, studies were performed comparing the efficiency of photodegradation of paracetamol versus salicylic acid and acetophenone versus 4-aminoacetophenone. The presence of amino/amide group decreased the efficiency of degradation significantly. It was also found that salicylic acid improved the degradation of paracetamol when both compounds were present in the reaction medium. The lower efficiency of photodegradation of the amino-based compounds seems to be related to the deactivation of the excited states of the TiO 2 and ZnO. Theoretical calculations at the TD-PBE0/6-311++G(3df,2p) high level were performed and corroborated our proposal.

show abstract

“…Due to their specific characteristics, which place them in the category of toxic organic compounds, they have a negative effect on the aquatic ecosystem, and also on human health [3]. For this reason, a wide range of methods for removing them from aqueous solutions have been developed over time, the most known being adsorption on various adsorbents [4], and advanced oxidation processes [5,6] of which photocatalytic oxidation has received special attention lately [7][8][9][10][11]. Although many of these methods have been shown to be effective in removing chlorophenols from many aqueous systems, their large-scale application is often difficult both technically and economically.…”

Section: Introductionmentioning

confidence: 99%

Examination of Photocatalyzed Chlorophenols for Sequential Photocatalytic-Biological Treatment Optimization

Bobiricǎ

Orbeci

2020

Catalysts

View full text Add to dashboard Cite

Given the known adverse effect of chlorophenols for the aquatic environments which they can reach, the development of efficient methods both technically and economically to remove them has gained increasing attention over time. The combination of photocatalytic oxidation with biological treatment can lead to high removal efficiencies of chlorophenols, while reducing the costs associated with the need to treat large volumes of aqueous solutions. Therefore, the present paper had as its main objective the identification of the minimum photocatalytic oxidation period during which the aqueous solutions of 4-chlorophenol and 2,4-dichlorophenol can be considered as readily biodegradable. Thus, the results of photocatalytic oxidation and biodegradability tests showed that, regardless of the concentration of chlorophenol and its type, the working solutions become readily biodegradable after up to 120 min of irradiation in ultraviolet light. At this irradiation time, the maximum organic content of the aqueous solution is less than 40%, and the biochemical oxygen demand and chemical oxygen demand (BOD/COD) ratio is much higher than 0.4. The maximum specific heterotrophic growth rate of activated sludge has an average value of 4.221 d−1 for 4-chlorophenol, and 3.126 d−1 for 2,4-dichlorophenol. This irradiation period represents at most half of the total irradiation period necessary for the complete mineralization of the working solutions. The results obtained were correlated with the intermediates identified during the photocatalytic oxidation. It seems that, working solutions initially containing 4-chlorophenol can more easily form readily biodegradable intermediates.

show abstract

Photocatalytic removal of 4-chlorophenol present in water using ZrO2/LDH under UV light source

Cited by 27 publications

References 52 publications

Enhanced Chlorinated Pollutant Degradation by the Synergistic Effect between Dechlorination and Hydroxyl Radical Oxidation on a Bimetallic Single-Atom Catalyst

Enhanced Chlorinated Pollutant Degradation by the Synergistic Effect between Dechlorination and Hydroxyl Radical Oxidation on a Bimetallic Single-Atom Catalyst

Salicylic Acid Boosts the TiO2 and ZnO-Mediated Photodegradation of Paracetamol

Examination of Photocatalyzed Chlorophenols for Sequential Photocatalytic-Biological Treatment Optimization

Contact Info

Product

Resources

About