Photocatalytic oxidation of sulfamethoxazole in the presence of TiO2: Effect of matrix in aqueous solution on decomposition mechanisms

Yuan, Rongfang; Zhu, Yudan; Zhou, Beihai; Hu, Jiangyong

doi:10.1016/j.cej.2018.11.019

Cited by 114 publications

(58 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This phenomenon could suggest that the adsorbed NOM favors de-ethylation of the tertiary amide to form m/z over hydroxylation of the DEET to the m/z 208 byproduct. These results are consistent with suppressed hydroxylation pathways reported for ciprofloxacin and sulfamethoxazole photocatalysis by TiO2 in the presence of NOM and suggest hydroxyl radical scavenging by the NOM 42,47. Alternatively, the NOM may suppress the subsequent degradation of m/z 164 more effectively than m/z 208, or otherwise show a different interaction (e.g.…”

supporting

confidence: 88%

DEET Degradation by Titanium Dioxide–Zeolite Nanocomposites: Effects of Aggregation State, Water Chemistry, and Natural Organic Matter

Berté¹,

Chen²,

Mathew³

et al. 2020

Preprint

View full text Add to dashboard Cite

Immobilization of titanium dioxide nanoparticles (TiO2 NPs) facilitates their removal and reuse in water treatment applications. Composite materials of electrostatically-bound TiO2 NPs and zeolite particles have been proposed, but limited mechanistic studies are available on their performance in complex media. This study delineates the relative importance of homo- and heteroaggregation, water chemistry, and surface fouling by natural organic matter (NOM) on the photocatalytic degradation of diethyltoluamide (DEET) by TiO2-zeolite composites. Zeolite adsorbs a portion of the DEET, rendering it unavailable for degradation; corrections for this adsorption depletion allowed appropriate comparison of the reactivity of the composites to the NPs alone. The TiO2-zeolite composites showed enhanced DEET degradation in moderately hard water (MHW) compared to deionized water (DIW), likely attributable to the influence of HCO3−, whereas a net decline in reactivity was observed for the TiO2 NPs alone upon homoaggregation in MHW. The composites also better maintained reactivity in the presence of NOM in MHW, as removal of Ca2+ onto the zeolite mitigated fouling of the TiO2 surface by NOM. However, NOM induced partial dissociation of the composites. DEET byproduct formation, identified by quadrupole–time of flight (QTOF) mass spectrometry, was generally unaffected by the zeolite, while NOM fouling favored de-ethylation over hydroxylation products. Overall, the most significant factor influencing TiO2 reactivity toward DEET was NOM adsorption, followed by homoaggregation, electrolytes (here, MHW versus DIW), and heteroaggregation. These findings can inform a better understanding of NP reactivity in engineered water treatment applications.

show abstract

supporting

confidence: 88%

DEET Degradation by Titanium Dioxide–Zeolite Nanocomposites: Effects of Aggregation State, Water Chemistry, and Natural Organic Matter

Berté¹,

Chen²,

Mathew³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Although increased catalyst dosage led to a slight decrease in photocatalytic SMX removal from 86% to 76%, COD removal efficiency improved from 35% to 65%. Authors explain this phenomenon as follows: SMX can be better degraded by photolysis in UV-C light (SMX absorbs light at 250-270 nm [81,84]), than by photocatalysis. High photocatalyst loading results in high UV light absorption on TiO 2 surface.…”

Section: Effect Of Catalyst Concentrationmentioning

confidence: 99%

“…This can be explained when the ionic states of both pharmaceutical compound and photocatalyst are considered. The pK a values of SMX are reported to be as follows: pK a1 = 1.85 ± 0.30 and pK a2 = 5.60 ± 0.04 [75,84]. It means that SMX exists in cationic form when pH < 1.85, in anionic form when pH > 5.6, and in neutral form when 1.85 < pH < 5.6.…”

Section: Effect Of Phmentioning

confidence: 99%

“…As a result, adsorption cannot contribute to SMX removal, and only photocatalytic degradation takes place [90]. Besides, when initial pH is close to pH ZPC of photocatalyst, catalyst aggregation might occur, resulting in reduced surface area and decreased photodegradation efficiency [84]. Results suggest that the neutral form of SMX (pH 3-5) is more easily photodegraded than its charged species [73,75], as SMX shows stronger light absorption and higher photochemical reactivity in its neutral form [84].…”

Section: Effect Of Phmentioning

confidence: 99%

“…When the main reactive species in the degradation process are holes (h + ), low pH values favor efficiency of photocatalytic decomposition [89]. On the other hand, if the main reactive species are • OH, then an increase in pH leads to an • OH content increase and, therefore, enhances photodegradation efficiency [84,89,90]. For example, in their research, Wang et al [89] found that h + played major role in the photocatalytic degradation of SMX, while de Matos Rodrigues et al [92] reported • OH and O 2…”

Section: Effect Of Phmentioning

confidence: 99%

See 2 more Smart Citations

Application of TiO2-Based Photocatalysts to Antibiotics Degradation: Cases of Sulfamethoxazole, Trimethoprim and Ciprofloxacin

2021

View full text Add to dashboard Cite

The extensive application of antibiotics in human and veterinary medicine has led to their widespread occurrence in a natural aquatic environment. Global health crisis is associated with the fast development of antimicrobial resistance, as more and more infectious diseases cannot be treated more than once. Sulfamethoxazole, trimethoprim and ciprofloxacin are the most commonly detected antibiotics in water systems worldwide. The persistent and toxic nature of these antibiotics makes their elimination by conventional treatment methods at wastewater treatment plants almost impossible. The application of advanced oxidation processes and heterogeneous photocatalysis over TiO2-based materials is a promising solution. This highly efficient technology has the potential to be sustainable, cost-efficient and energy-efficient. A comprehensive review on the application of various TiO2-based photocatalysts for the degradation of sulfamethoxazole, trimethoprim and ciprofloxacin is focused on highlighting their photocatalytic performance under various reaction conditions (different amounts of pollutant and photocatalyst, pH, light source, reaction media, presence of inorganic ions, natural organic matter, oxidants). Mineralization efficiency and ecotoxicity of final products have been also considered. Further research needs have been presented based on the literature findings. Among them, design and development of highly efficient under sunlight, stable, recyclable and cost-effective TiO2-based materials; usage of real wastewaters for photocatalytic tests; and compulsory assessment of products ecotoxicity are the most important research tasks in order to meet requirements for industrial application.

show abstract

Constructing Heptazine‐COF@TiO₂ Heterojunction Photocatalysts for Efficient Photodegradation of Acetaminophen under Visible Light

Ge,

Cai,

Deng

et al. 2024

ChemPlusChem

View full text Add to dashboard Cite

Constructing heterojunction photocatalysts are widely applied to boost the photocatalytic activity of materials. Here, a novel covalent organic framework (COF) material with heptazine units was developed and hybridized with TiO2 nano particles (NPs) to fabricate the Heptazine‐COF@TiO2 photocatalysts for acetaminophen (AAP) photodegradation. The successfully assembled heptazine unit endows the Heptazine‐COF with outstanding semiconductor property (optical bandgap is 2.53 eV). The synthesized Heptazine‐COF@TiO2 hybrids is proved to have the heterojunction structure with high visible light activity and fast charge‐carrier mobility, and exhibits better performance in photodegradation of AAP under visible light. The excellent photodegradation efficiency (rate constant: 0.758 min‐1) and high reusability (rate constant: 0.452 min‐1 in the 6th cycles) of the optimized sample outperform the traditional inorganic photocatalysts and other heterojunction photocatalysts. In addition, these photocatalysts present universal degradation activity for other dyes and antibiotics.

show abstract

Photocatalytic oxidation of sulfamethoxazole in the presence of TiO2: Effect of matrix in aqueous solution on decomposition mechanisms

Cited by 114 publications

References 54 publications

DEET Degradation by Titanium Dioxide–Zeolite Nanocomposites: Effects of Aggregation State, Water Chemistry, and Natural Organic Matter

DEET Degradation by Titanium Dioxide–Zeolite Nanocomposites: Effects of Aggregation State, Water Chemistry, and Natural Organic Matter

Application of TiO2-Based Photocatalysts to Antibiotics Degradation: Cases of Sulfamethoxazole, Trimethoprim and Ciprofloxacin

Constructing Heptazine‐COF@TiO₂ Heterojunction Photocatalysts for Efficient Photodegradation of Acetaminophen under Visible Light

Contact Info

Product

Resources

About

Photocatalytic oxidation of sulfamethoxazole in the presence of TiO2: Effect of matrix in aqueous solution on decomposition mechanisms

Cited by 114 publications

References 54 publications

DEET Degradation by Titanium Dioxide–Zeolite Nanocomposites: Effects of Aggregation State, Water Chemistry, and Natural Organic Matter

DEET Degradation by Titanium Dioxide–Zeolite Nanocomposites: Effects of Aggregation State, Water Chemistry, and Natural Organic Matter

Application of TiO2-Based Photocatalysts to Antibiotics Degradation: Cases of Sulfamethoxazole, Trimethoprim and Ciprofloxacin

Constructing Heptazine‐COF@TiO2 Heterojunction Photocatalysts for Efficient Photodegradation of Acetaminophen under Visible Light

Contact Info

Product

Resources

About

Constructing Heptazine‐COF@TiO₂ Heterojunction Photocatalysts for Efficient Photodegradation of Acetaminophen under Visible Light