Integrated adsorption and catalytic degradation of safranine T by a porous covalent triazine-based framework

Zheng, Xiaofeng; Ruan, Qunqun; Jiang, Qin; Wang, Keke; Wang, Qinghui; Tang, Yuanzhe; Huang, Hongliang; Zhong, Chongli

doi:10.1016/j.jcis.2018.07.113

Cited by 46 publications

(17 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The existence of the electronegative keto form in TpPa-COOH may help to form electrostatic and p-p interactions between the p-conjugated structures of TpPa-COOH and the plane cationic dye molecules (Scheme 2, taking ST as an example). [45] By mixing equal volumes of MB and EB or ST and EB solutions with the initial dye concentration of 100 mg L À1 ,the selective adsorption for mixed dye solutions was studied (Figure 5). After adsorbed, the color of dye mixture solutions became orange for each case, which is the color of EB.…”

Section: Resultsmentioning

confidence: 99%

“…The three dyes used here own similar molecular sizes and so the pore‐size effect could be negligible. The existence of the electronegative keto form in TpPa‐COOH may help to form electrostatic and π–π interactions between the π‐conjugated structures of TpPa‐COOH and the plane cationic dye molecules (Scheme 2, taking ST as an example) [45] …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

A Carboxyl‐Functionalized Covalent Organic Framework Synthesized in a Deep Eutectic Solvent for Dye Adsorption

Dong

Wang

et al. 2021

Chemistry A European J

View full text Add to dashboard Cite

Instead of using organic solvents, a deep eutectic solvent (DES) composed of tetrabutylammonium bromide and imidazole (Bu4NBr/Im) was employed as a solvent for the first time to synthesize covalent organic frameworks (COFs). Due to the low vapor pressure of the Bu4NBr/Im‐based DES, a new carboxyl‐functionalized COF (TpPa‐COOH) was synthesized under environmental pressure. The as‐synthesized TpPa‐COOH has open channels, and the DES can be removed completely from the pores. The dye adsorption performance of TpPa‐COOH was examined for three organic dyes with similar molecular sizes: one anionic dye (eosin B, EB) and two cationic dyes (methylene blue, MB and safranine T, ST). TpPa‐COOH showed an excellent selective adsorption effect on MB and ST. The electronegative keto form in TpPa‐COOH might help to form electrostatic and π–π interactions between the π‐stacking frameworks of TpPa‐COOH and the positive plane MB and ST molecules. The adsorption isotherms of MB and ST on TpPa‐COOH were further investigated in detail, and the equilibrium adsorption was well modeled by using a Langmuir isotherm model. Together with hydrogen bonding, TpPa‐COOH showed higher adsorption capacity for ST than for MB (1135 vs. 410 mg g−1). These results could provide a guidance for the green synthesis of adsorbents in removing organic dyes from wastewater.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A Carboxyl‐Functionalized Covalent Organic Framework Synthesized in a Deep Eutectic Solvent for Dye Adsorption

Dong

Wang

et al. 2021

Chemistry A European J

View full text Add to dashboard Cite

show abstract

“…Meanwhile, research on using CTFs for the adsorption of pollutants in water is in its infancy but with good prospect, mainly concentrating on aromatic compounds, organic dyes, and heavy metals . In addition to adsorption potential, the photocatalytic ability originating from triazine-rings in CTFs makes them effective in oxidative degradation, , possibly mineralizing organic pollutants such as acidic and basic dyes including safranin T, methylene blue, methyl orange, and rhodamine B …”

Section: Introductionmentioning

confidence: 99%

“…19 Meanwhile, research on using CTFs for the adsorption of pollutants in water is in its infancy but with good prospect, mainly concentrating on aromatic compounds, 20 organic dyes, 21 and heavy metals. 22 In addition to adsorption potential, the photocatalytic ability originating from triazine-rings in CTFs makes them effective in oxidative degradation, 23,24 possibly mineralizing organic pollutants such as acidic and basic dyes including safranin T, 25 methylene blue, 26 methyl orange, and rhodamine B. 27 Combining the adsorption potential and photocatalytic ability, CTFs are expected to be designed into a class of adsorbents that regenerate themselves once the available adsorption sites are exhausted, without any additional harsh chemicals but with the assistance of sunlight.…”

Section: ■ Introductionmentioning

confidence: 99%

“…However, the significant lower adsorption capacity of PHE indicated that the PHE molecules could not be adsorbed effectively through π−π EDA interaction. The FTIR peaks of CTF-m at 1550 cm −1 red-shifted to 1546 cm −1 (see FigureS-7) after adsorption, suggesting the occurrence of hydrogen bonding interaction between pollutants and the CTF-m framework, which stemmed from the nitrogen atoms in the triazine or pyrrole units of CTFs with hydrogen atoms in the PHE molecules 20,25.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Defect-Abundant Covalent Triazine Frameworks as Sunlight-Driven Self-Cleaning Adsorbents for Volatile Aromatic Pollutants in Water

Shen

Zhu

et al. 2019

Environ. Sci. Technol.

112

View full text Add to dashboard Cite

Covalent triazine frameworks (CTFs) with high adsorption potential and photocatalytic ability features are expected to be designed as a new class of adsorbents that can regenerate themselves just by harnessing sunlight. To simultaneously improve both the adsorption and photocatalytic regeneration performance, a defect-abundant CTF-m was designed and tuned effectively by varying the lengths of benzene ring chains incorporated into the CTF backbone. It has been demonstrated that two kinds of defects in terms of broken benzene rings and pyrrole nitrogen were newly generated, other than the normal benzene rings and triazine units in the CTF-m skeleton. Benefiting from these defects, the adsorption sites with high energy for adsorbing volatile aromatic pollutants were significantly increased, which are reflected by higher saturated adsorption capacities of CTF-m (3.026 mmol/g for benzene (BEN), 1.490 mmol/g for naphthalene (NAP), and 0.863 mmol/g for phenol (PHE)) compared with those of CTF-1 and CTF-2. Furthermore, these defects narrowed the band structure and facilitated the separation of photogenerated charge carries, thus promoting photocatalytic regeneration. The percentage of CTF-m regenerated was still higher than 90% in the fourth cycle. These experimental results, together with the density functional theory (DFT) studies, soundly corroborated that the defects could optimize the adsorption and regeneration property of CTF-m. The present work highlights the potential of fabrication of defective CTFs as solar-driven self-cleaning adsorbents to remove pollutants from water.

show abstract

Triazine‐Functionalized Silsesquioxane‐Based Hybrid Porous Polymers for Efficient Photocatalytic Degradation of Both Acidic and Basic Dyes under Visible Light

Liu

2021

ChemCatChem

View full text Add to dashboard Cite

Four triazine-functionalized silsesquioxane-based hybrid porous polymers (TSHPPs) were synthesized by Heck reaction of octavinylsilsesquioxane (OVS) with brominated phenyl or thiophene substituted triazine monomers. These hybrid polymers offered good thermal stability, high specific surface areas (up to 555 m 2 g À 1 ), strong visible light absorption, and adjustable fluorescence properties. The materials showed high photocatalytic activity for the degradation of both acidic and basic dyes without additional oxidation agents or pH adjustments.Exposing to natural light, at a very low concentration of TSHPPs (0.2 mg mL À 1 ), dyes with a concentration of up to 1000 ppm can be completely decolorized. After five consecutive iterations of degradation dyes, TSHPPs still showed good regenerability. This work provides an efficient method for the construction of photo-responsive porous materials for solar-to-chemical energy conversion and demonstrates their potential as green and sustainable environment-friendly catalysts.

show abstract

Integrated adsorption and catalytic degradation of safranine T by a porous covalent triazine-based framework

Cited by 46 publications

References 60 publications

A Carboxyl‐Functionalized Covalent Organic Framework Synthesized in a Deep Eutectic Solvent for Dye Adsorption

A Carboxyl‐Functionalized Covalent Organic Framework Synthesized in a Deep Eutectic Solvent for Dye Adsorption

Defect-Abundant Covalent Triazine Frameworks as Sunlight-Driven Self-Cleaning Adsorbents for Volatile Aromatic Pollutants in Water

Triazine‐Functionalized Silsesquioxane‐Based Hybrid Porous Polymers for Efficient Photocatalytic Degradation of Both Acidic and Basic Dyes under Visible Light

Contact Info

Product

Resources

About