A hybrid block consisting of covalent triazine frameworks and GO aerogel with switchable selectivity between adsorption of UV filters and regeneration under sunlight

Shen, Yi; Zhu, Chao; Chen, Jianmeng; Fang, Qile; Chen, Wenyu; He, Zhiqiao; Xu, Haomiao; Song, Shuang

doi:10.1016/j.cej.2020.125074

Cited by 20 publications

(22 citation statements)

References 41 publications

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“…Moreover, the intermediates of BP could be detected during the photocatalytic regeneration process (Figure S-15). These hydroxylated intermediates indicated that the oxidation of adsorbed pollutants during photocatalytic regeneration underwent •OH-attack pathway …”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, this delocalization effect strengthened the charge transfer response from N 2p orbitals to C 2p orbitals, which was conducive to electron transfer and enhanced catalytic activity. 48 To further explore the possible pollutants oxidation pathway of the adsorbed 3D DOAs 21 According to these results, the key factor in improving the photocatalytic activity of 3D DOA-2 is the optimization of the electronic structure in the CTF. This originated from the increase in nitrogen defects in the CTF and the repair of πconjugated networks in GO nanosheets with the decrease in carbon defects.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…For the CTF, defects below the conduction band (CB) could act as midgap states to improve the photocatalysis. , favoring the absorbance of photons with energy lower than the band gap and suppressing the recombination of electrons and holes. In our previous work, combination of 2D GO and CTF into a 3D porous aerogel-based composite adsorbent was applied to remove pollutants from water owing to its large specific surface area, effective solar absorption, and convenience of recycling . However, carbon defects in GO and less nitrogen defects in the CTF limit the adsorption–photoregeneration performance. , In particular, further environmental application was hindered by the slow photocatalytic reaction kinetics of the adsorption–regeneration process .…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work, combination of 2D GO and CTF into a 3D porous aerogelbased composite adsorbent was applied to remove pollutants from water owing to its large specific surface area, effective solar absorption, and convenience of recycling. 21 However, carbon defects in GO and less nitrogen defects in the CTF limit the adsorption−photoregeneration performance. 22,23 In particular, further environmental application was hindered by the slow photocatalytic reaction kinetics of the adsorption− regeneration process.…”

Section: ■ Introductionmentioning

confidence: 99%

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Bidirectional Progressive Optimization of Carbon and Nitrogen Defects in Solar-Driven Regenerable Adsorbent to Remove UV-Filters from Water

et al. 2021

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Defect engineering of nanomaterials has emerged as a promising approach to improve their performance for pollutant removal. However, various nanomaterial defects play variant roles in environmental applications. It is still a challenge to construct multiple defects of composite materials into advantageous aggregates to deal with complicated matrix pollution. In this work, we investigated a series of three-dimensional defectoptimized aerogels (3D DOAs) of graphene oxide (GO) with a covalent triazine framework (CTF) for improved adsorption and photoregeneration performance via tailoring duet carbon and nitrogen defects. Using chemical reduction, carbon defects in GO were gradually repaired and nitrogen defects in CTF were created simultaneously. The carbon defect engineering generated additional nonpolarized electron-depleted sites in GO of 3D DOA for increased adsorption capacities (2417 μmol/g for benzophenone, 2209 μmol/g for 4-hydroxybenzophenone, 1957 μmol/g for 2,2′,4,4′-tetrahydroxybenzophenone). Meanwhile, increasing nitrogen defects of the CTF in 3D DOA would produce midgap states for an extended absorption range of visible light and increased photocatalytic activity to remove adsorbed pollutants. The enhanced adsorption and the superior photocatalytic regeneration soundly corroborated that the performance of 3D DOA was improved effectively by the defect optimization strategy. Moreover, the high stability of 3D DOA and its practical usage were verified in a real water matrix with a 7-day cycle test. The present work highlights an approach of defect optimization for development of a solardriven, self-regenerative adsorbent for water purification with high efficiency.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Bidirectional Progressive Optimization of Carbon and Nitrogen Defects in Solar-Driven Regenerable Adsorbent to Remove UV-Filters from Water

et al. 2021

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“…Aerogels are not only rich in material composition, but also have various microstructures of the gel skeleton. The building blocks of the aerogel gel skeleton mainly include: (i) zero-dimensional (0D) nanoparticles [ 14 ], (ii) one-dimensional (1D) nanowires [ 15 ], and (iii) two-dimensional (2D) nanosheets [ 16 ]. Different element compositions and microstructures cause aerogels to exhibit various excellent properties for different applications.…”

Section: Introductionmentioning

confidence: 99%

Silica-Bacterial Cellulose Composite Aerogel Fibers with Excellent Mechanical Properties from Sodium Silicate Precursor

Song

Miao

Sai

et al. 2021

Gels

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Forming fibers for fabric insulation is difficult using aerogels, which have excellent thermal insulation performance but poor mechanical properties. A previous study proposed a novel method that could effectively improve the mechanical properties of aerogels and make them into fibers for use in fabric insulation. In this study, composite aerogel fibers (CAFs) with excellent mechanical properties and thermal insulation performance were prepared using a streamlined method. The wet bacterial cellulose (BC) matrix without freeze-drying directly was immersed in an inorganic precursor (silicate) solution, followed by initiating in situ sol-gel reaction under the action of acidic catalyst after secondary shaping. Finally, after surface modification and ambient drying of the wet composite gel, CAFs were obtained. The CAFs prepared by the simplified method still had favorable mechanical properties (tensile strength of 4.5 MPa) and excellent thermal insulation properties under extreme conditions (220 °C and −60 °C). In particular, compared with previous work, the presented CAFs preparation process is simpler and more environmentally friendly. In addition, the experimental costs were reduced. Furthermore, the obtained CAFs had high specific surface area (671.3 m²/g), excellent hydrophobicity, and low density (≤0.154 g/cm3). This streamlined method was proposed to prepare aerogel fibers with excellent performance to meet the requirements of wearable applications.

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Recent Progress of Covalent Organic Frameworks‐Based Materials in Photocatalytic Applications: A Review

Zhang

et al. 2023

Small

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Covalent organic frameworks (COFs) are one type of porous organic materials linked by covalent bonds. COFs materials exhibit many outstanding characteristics such as high porosity, high chemical and thermal stability, large specific surface area, efficient electron transfer efficiency, and the ability for predesigned structures. These exceptional advantages enable COFs materials to exhibit remarkable performance in photocatalysis. Additionally, the activity of COFs materials as photocatalysts can be significantly upgraded by ion doping and the formation of heterojunctions. This paper summarizes the latest research progress on COF‐based materials applied in photocatalytic systems. Initially, typical structures and preparation methods of COFs are analyzed and compared. Moreover, the essential principles of photocatalytic reactions over COFs‐based materials and the latest research developments in photocatalytic hydrogen production, CO2 reduction, pollutants elimination, organic transformation, and overall water splitting are indicated. At last, the outlook and challenges of COF‐based materials in photocatalysis are discussed. This review is intended to permit instructive guidance for the efficient use of photocatalysis based on COFs in the future.

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A hybrid block consisting of covalent triazine frameworks and GO aerogel with switchable selectivity between adsorption of UV filters and regeneration under sunlight

Cited by 20 publications

References 41 publications

Bidirectional Progressive Optimization of Carbon and Nitrogen Defects in Solar-Driven Regenerable Adsorbent to Remove UV-Filters from Water

Bidirectional Progressive Optimization of Carbon and Nitrogen Defects in Solar-Driven Regenerable Adsorbent to Remove UV-Filters from Water

Silica-Bacterial Cellulose Composite Aerogel Fibers with Excellent Mechanical Properties from Sodium Silicate Precursor

Recent Progress of Covalent Organic Frameworks‐Based Materials in Photocatalytic Applications: A Review

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