A novel hydroxyl-riched covalent organic framework as an advanced adsorbent for the adsorption of anionic azo dyes

Wang, Luchun; Tao, Yongqing; Wang, Junji; Tian, Meng; Liu, Shaochi; Qiu, Tian; Yang, Lijuan; Wang, Dandan; Li, Xiang; Gao, Die

doi:10.1016/j.aca.2022.340329

Cited by 32 publications

(10 citation statements)

References 44 publications

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“…Industrial wastewater discharge has been increasing in recent years, and policies are placing higher requirements for water quality. Most pollutants in industrial wastewater are highly toxic and nonbiodegradable, seriously affecting the surrounding ecological environment. , Current treatment methods include conventional biological treatment, adsorption, flocculation, membrane separation, and advanced oxidation . However, these methods have disadvantages such as their high operation cost, large sludge production, and generation of toxic byproducts .…”

Section: Introductionmentioning

confidence: 99%

Electrocagulation Coupled With Carbon Fiber Filtration Enables Stable Performance and Low Sludge Production over a Broad Range of Operating Temperatures

Fan,

Shi,

Huang

et al. 2024

ACS EST Eng.

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As industrial wastewater discharges continue to increase, which is hazardous and stable, it is important to develop the treatment method that is highly effective and low operational cost. This study describes a reactor that comprises a sacrificial Fe anode and a novel carbon fiber filter cathode to combine electrocoagulation with contracted carbon fiber filter (EC− CCF). Such configuration can achieve the high removal efficiency under low current densities, thereby significantly reducing sludge production. The EC−CCF can achieve a removal efficiency of 96.7% using Acid Orange 7 (AO7) as the model pollutant at a low current density of 20 A m −2 , which was 50% less than that of the EC reactor, thereby producing 55.1% less sludge. Additionally, the EC−CCF reactor maintained a stable performance over a range of operating temperatures from 25 to 5 °C, while the removal efficiency of the EC decreased from 83.9 to 54.2%. Electrochemical backwashing and pore size increase can achieve a 96% flux recovery, effectively removing both external and internal fouling of the EC−CCF. Meanwhile, the EC−CCF reactor achieved an effective removal efficiency using actual wastewater while maintaining a near full flux recovery over 20 cleaning cycles. The overall economic analysis revealed that EC−CCF offers high removal efficiency, performance stability, and cost effectiveness due to much lower operating current densities and sludge production. Therefore, EC− CCF is a promising technique that offers a stable performance and low overall cost for treating industrial wastewater.

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Section: Introductionmentioning

confidence: 99%

Electrocagulation Coupled With Carbon Fiber Filtration Enables Stable Performance and Low Sludge Production over a Broad Range of Operating Temperatures

Fan,

Shi,

Huang

et al. 2024

ACS EST Eng.

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“…CR is commonly utilized as a pigment and dye in food, pharmaceutical, cosmetic, paper, plastic, printing, dyestuff, leather and textile industries, producing plenty of wastewater containing CR. [1][2][3][4][5] CR is resistant to photodegradation and biodegradation in nature because of its highly stable aromatic structure. 1 And CR is highly toxic to human health and the environment.…”

Section: Introductionmentioning

confidence: 99%

“…Once entering the human body, its metabolite, benzidine, is a notorious carcinogen and mutagen. [2][3][4][5][6] Moreover, CR can lead to nausea, vomiting, diarrhea, and allergic problems. 1,4,5 Consequently, sensitive detection of CR is of considerable signicance.…”

Section: Introductionmentioning

confidence: 99%

“…Yet this method is not sensitive enough. 2 Recently, carbon quantum dots (CQDs) have been fabricated for the uorescence assay of CR. 1,4,5 For example, yellow-green emissive CQDs from hydrothermal treatment of pphenylenediamine and citric acid were applied for uorescence "turn-off" detection of CR with a limit of detection (LOD) of 0.03 mg mL −1 .…”

Section: Introductionmentioning

confidence: 99%

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Simple fluorescence “turn-off” assay for Congo red using commercial 2-aminophthalic acid

Qian,

Li,

Jiang

et al. 2024

Anal. Methods

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“…The typical characteristics of their wastewater include difficult biodegradation, high coloration even at low concentrations, and high organic concentrations [5]. Reactive dyes and their degradation byproducts are toxic, carcinogenic, teratogenic, and mutagenic [6]. Adsorption is considered one of the most desirable methods for dye removal due to its low cost, simplicity of operation, low energy requirements, and recoverable adsorbent [7].…”

Section: Introductionmentioning

confidence: 99%

Polyethylenimine Crosslinked 3-Aminopropyltriethoxysilane Grafted Multiwall Carbon Nanotubes for Efficient Adsorption of Reactive Yellow 2 from Water

Wang¹,

Won²

2023

Preprint

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This research intended to report amine-functionalized multiwall carbon nanotubes (MWCNTs) prepared by a simple method for efficient and rapid removal of Reactive Yellow 2 (RY2) from water. EDS analysis showed that the N content increased from 0 to 2.42% and from 2.42 to 8.66% after modification by APTES and PEI, respectively. BET analysis displayed that the specific surface area, average pore size, and total pore volume were reduced from 405.22 to 176.16 m2/g, 39.67 to 6.30 nm, and 4.02 to 0.28 cm3/g, respectively. These results proved that the PEI/APTES-MWCNTs were successfully prepared. pH edge experiment indicated that pH 2 was optimal for RY2 removal. At pH 2 and 25 °C, the time required for adsorption equilibrium was 10, 15, and 180 min at initial concentrations of 50, 100, and 200 mg/L, respectively; and the maximum RY2 uptake calculated by the Langmuir model was 714.29 mg/g. Thermodynamic studies revealed that the adsorption process was spontaneous and endothermic. 0-0.1 mol/L of NaCl showed negligible effect on RY2 removal by PEI/APTES-MWCNTs. Five adsorption/desorption cycles confirmed the good reusability of PEI/APTES-MWCNTs in RY2 removal. Overall, the PEI/APTES-MWCNTs are a potential and efficient adsorbent for reactive dye wastewater treatment.

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A novel hydroxyl-riched covalent organic framework as an advanced adsorbent for the adsorption of anionic azo dyes

Cited by 32 publications

References 44 publications

Electrocagulation Coupled With Carbon Fiber Filtration Enables Stable Performance and Low Sludge Production over a Broad Range of Operating Temperatures

Electrocagulation Coupled With Carbon Fiber Filtration Enables Stable Performance and Low Sludge Production over a Broad Range of Operating Temperatures

Simple fluorescence “turn-off” assay for Congo red using commercial 2-aminophthalic acid

Polyethylenimine Crosslinked 3-Aminopropyltriethoxysilane Grafted Multiwall Carbon Nanotubes for Efficient Adsorption of Reactive Yellow 2 from Water

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