Highly efficient ZnO photocatalytic foam reactors for micropollutant degradation

Guaraldo, Thaís Tasso; Vakili, Reza; Wenk, Jannis; Mattia, Davide

doi:10.1016/j.cej.2022.140784

Cited by 34 publications

(9 citation statements)

References 74 publications

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“…The global environmental crisis and growing human population have put a significant strain on potable water sources available to society, resulting in severe issues such as a lack of water and increased water pollution. [27] To address these crises, various advanced separation technologies, such as adsorbents, [28,29] photocatalytic degradation, [30,31] and membrane separation, [32,33] have been proposed and employed by researchers to remove toxic and harmful organic micropollutants in environmental and biological systems. Among these remediation technologies, membrane separation technology is regarded as a simple, mild operation temperature, cost efficient, energy-saving, and efficient treatment approach and is one of the alternatives to energy-consuming traditional industrial techniques such as distillation and evaporation.…”

Section: Precise Molecular Sieving Of Self-standing Scof Membranesmentioning

confidence: 99%

A 2D Soft Covalent Organic Framework Membrane Prepared via a Molecular Bridge

Sun

Wen

et al. 2023

Advanced Materials

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Highly flexible and robust self-standing covalent organic framework (COF) membranes with rapid preparation are important but technically challenging for achieving precise separation. Herein , a novel imine-based 2D soft covalent organic framework (SCOF) membrane with a large area of 226.9 cm 2 , via ingeniously selecting an aldehyde flexible linker and a trigonal building block, is reported. The soft 2D covalent organic framework membrane is rapidly formed (≈5 min) based on the sodium dodecyl sulfate (SDS) molecular channel constructed at the water/dichloromethane (DCM) interface, which is the record-fast SCOF membrane formation and 72 times faster than that in the reported literature. MD simulation and DFT calculation elucidate that the dynamic, self-assembled SDS molecular channel facilitates faster and more homogeneous transfer of amine monomers in the bulk, thereby forming a soft 2D self-standing COF membrane with more uniform pores. The formed SCOF membrane exhibits superb sieving capability for small molecules, robustness in strong alkaline (5 mol L −1 NaOH), acid (0.1 mol L −1 HCl), and various organic solutions, and sufficient flexibility with a large curvature of 2000 m −1 for membrane-based separation science and technology.

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Section: Precise Molecular Sieving Of Self-standing Scof Membranesmentioning

confidence: 99%

A 2D Soft Covalent Organic Framework Membrane Prepared via a Molecular Bridge

Sun

Wen

et al. 2023

Advanced Materials

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“…For example, Thais et al prepared photocatalytic foam in both liquid templating and sintering methods (Figure 7c). [11] They mixed the suspension of ZnO, PVA, and CTAB to prepare a liquid template, the photocatalytic foams which were highly porous (93.0-94.0%) can be obtained after adding the dihydrofuran and sintering. According to the different atmospheres during sintering, including atmospheric and nitrogen saturation conditions, ZnO foams were divided into two groups, photocatalytic degraded 66% and 64% CBZ respectively in 2 h, and exhibited the stability of photocatalytic properties in 5 cycles, ZnO foams has the potential to treat wastewater in sewage treatment plants.…”

Section: Foaming Photocatalysts On Membranesmentioning

confidence: 99%

“…Compared with free photocatalysts, the photocatalysts on a membrane have smaller contact areas with the reactant for parts of photocatalysts are wrapped in the membrane, and Diagram of mechanism between fixed and free system, fabrication, and testing for membranes. [7][8][9][10][11] non-conductive substrate hinders the movement of electrons, resulting in lower photocatalytic efficiency. Afterward, in order to prepare photocatalytic membranes with stable performance, requirements such as exposing photocatalysts sufficiently, ensuring photocatalysts will not fall off from membranes and membranes should be able to float on the water surface should be met.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Membranes Toward Practical Environmental Remediation: Fundamental, Fabrication, and Application

Wu,

Yang,

Zhao

et al. 2023

Advanced Sustainable Systems

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With the serious pollution of water resources in the process of social development, green and environmentally friendly photocatalytic technology has gradually attracted widespread attention. Though photocatalytic theory and technology are relatively mature, the current research is mainly focused on powders and less on the photocatalytic membranes, and few real practical cases of photocatalysis are studied. To summarize and update these advanced studies, this paper introduces the latest progress in photocatalytic membranes including discussing the differences of photocatalytic mechanism between free and fixed photocatalytic systems and the design philosophy of photocatalytic membranes. At the same time, some common fabrication methods, including in situ growth, coating, spinning, casting, and foaming methods are analyzed. Besides, the photocatalytic performances of different photocatalytic membranes in the actual environment and their use conditions are explored. Finally, a critical view of future trends is included. The explanation of the photocatalytic mechanism, large‐scale production, and the practicality of photocatalytic products are all problems that need to be solved in the future.

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“…This is because nontoxic and highly stable chemical catalysts are utilized in the photocatalytic reaction. , This technique is also recognized as an efficient and cost-effective treatment technology. , The use of semiconductors in photocatalysis plays a crucial role, as they are photoexcited when radiated under ultraviolet or visible light . ZnO, TiO 2 , and WO 3 are some of the semiconductors employed in the process. For instance, Budarz and co-workers successfully degraded 80% of chlorpyrifos using TiO 2 nanoparticles within 24 h …”

Section: Introductionmentioning

confidence: 99%

“…11,12 The use of semiconductors in photocatalysis plays a crucial role, as they are photoexcited when radiated under ultraviolet or visible light. 13 ZnO, 14 TiO 2 , 15 and WO 3 16 are some of the semiconductors employed in the process. For instance, Budarz and co-workers successfully degraded 80% of chlorpyrifos using TiO 2 nanoparticles within 24 h. 17 Among the semiconductor photocatalysts, titanium dioxide (TiO 2 ) is widely employed due to its great benefits involving low toxicity, high chemical inertness, cost-effectiveness, and being environmentally friendly.…”

Section: ■ Introductionmentioning

confidence: 99%

C,N-Codoped TiO₂ Nanoparticles Immobilized on Floating Alginate Beads for Diazinon Removal under Solar Light Irradiation

Mohamad Idris,

Cheong,

Smith

et al. 2023

ACS Appl. Nano Mater.

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Filtration is a critical step during wastewater treatment, in which the catalyst must be separated from the aqueous system for the next treatment. For effective separation of the catalyst, a proper strategy is demanded to overcome the filtration issue in the suspended catalyst system. Therefore, an innovative photocatalytic system with C,N-TiO 2 NPs immobilized on floating alginate beads was designed via the ionotropic gelation method to treat diazinon as a model pollutant under solar light irradiation. The synthesized C,N-TiO 2 NPs showed unique features including an anatase phase with a crystallite size of 11 ± 2.1 nm, active under the visible light region with a lower bandgap energy of 2.94 eV than 3.2 eV of bulk anatase TiO 2 , and has slower recombination of electron−hole pairs than the bulk anatase TiO 2 . The XPS analysis also confirmed that C and N were codoped into TiO 2 from the shift of binding energy for Ti 2p. SEM analysis provided evidence that many accumulated powders of the synthesized C,N-TiO 2 NPs were dispersed onto the alginate bead surface. The designed C,N-TiO 2 NP/alginate bead floating photocatalyst achieved the excellent removal of diazinon of 80.61% and a mineralization degree of 60.08% with the presence of dominant ROS (•O 2 − radicals) under solar light for 8 h. The degradation kinetics followed first-order kinetics, whereas the Langmuir isotherm model was fitted for the adsorption isotherm. It could be reused for five cycles with 76.84% diazinon removal, reflecting the great reusability of the floating photocatalyst during photodegradation. Thus, this work creates a novel designation of C,N-TiO 2 NP/ alginate bead floating photocatalysts that have great potential for application in photocatalytic wastewater treatment.

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Highly efficient ZnO photocatalytic foam reactors for micropollutant degradation

Cited by 34 publications

References 74 publications

A 2D Soft Covalent Organic Framework Membrane Prepared via a Molecular Bridge

A 2D Soft Covalent Organic Framework Membrane Prepared via a Molecular Bridge

Photocatalytic Membranes Toward Practical Environmental Remediation: Fundamental, Fabrication, and Application

C,N-Codoped TiO₂ Nanoparticles Immobilized on Floating Alginate Beads for Diazinon Removal under Solar Light Irradiation

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Highly efficient ZnO photocatalytic foam reactors for micropollutant degradation

Cited by 34 publications

References 74 publications

A 2D Soft Covalent Organic Framework Membrane Prepared via a Molecular Bridge

A 2D Soft Covalent Organic Framework Membrane Prepared via a Molecular Bridge

Photocatalytic Membranes Toward Practical Environmental Remediation: Fundamental, Fabrication, and Application

C,N-Codoped TiO2 Nanoparticles Immobilized on Floating Alginate Beads for Diazinon Removal under Solar Light Irradiation

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Product

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About

C,N-Codoped TiO₂ Nanoparticles Immobilized on Floating Alginate Beads for Diazinon Removal under Solar Light Irradiation