Small
·
2022
·Vol. 18
·期 25
·2201340
·
IF 15.153
Ge Yan,Xiaodong Sun,Kailai Zhang,Yu Zhang,Hui Li,Yuhai Dou,Ding Yuan,Hongwei Huang,Baohua Jia,Hao Li,Tianyi Ma
2D covalent organic frameworks (COFs) are considered as one kind of the most promising crystalline porous materials for solar-driven hydrogen production. However, adding noble metal co-catalysts into the COFs-based photocatalytic system is always indispensable. Herein, through a simple solvothermal synthesis method, TpPa-1-COF, a typical 2D COF, which displays a wide light absorption region, is rationally combined with transition metal phosphides (TMPs) to fabricate three TMPs/TpPa-1-COF hybrid materials, named Ni 12 P 5 (Ni 2 P or CoP)/TpPa-1-COF. The incorporated TMPs can be served as electron collectors for accelerating the transfer of charges on TpPa-1-COF, thus the composites are demonstrated to be efficient photocatalysts for promoting water splitting. Benefitting from the richer surface reactive sites and lower H* formation energy barrier, the Ni 12 P 5 can most effectively improve the photocatalytic performance of the TpPa-1-COF, and the H 2 evolution rate can reach up to 31.6 µmol h −1 , approximately 19 times greater than pristine TpPa-1-COF (1.65 µmol h −1 ), and is comparable to the Pt/TpPa-1-COF (38.8 µmol h −1 ). This work is the first example of combining COFs with TMPs to construct efficient photocatalysts, which may offer new insight for constructing noble-metal-free COF-based photocatalysts.
研究领域:
材料科学
·
化学
·
能源科学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Zhipeng Zhao,Huimeng Feng,Dong Qin,Wen Li,Wei Wang,Shougang Chen
Herein, we designed and synthesized a two-dimensional covalent organic framework (2D-COF) of a Schiff base using a mechanical chemical grinding method. Moreover, capsaicin@chitosan (CAP@CS) microcapsules were loaded on a TpPa-1 COF by a physical adsorption method to prepare composites (CAP@CS/TpPa-1), which realized the pH-sensitive controlled release of the fungicide CAP, dispersed in fluorocarbon resin to prepare an intelligent coating with environmentally friendly long-term antifouling performance. TpPa-1 improves the antibacterial efficiency by increasing the dispersity of CAP@CS in the resin. Therefore, a CAP release amount of 2 wt % composite coating can meet the minimum bacteriostatic concentration of 37.5 μg/mL required for antifouling. Importantly, pH-responsive controlled release caused by the protonation of CS and the electrostatic interaction between CAP@CS and TpPa-1 COF and increased bacterial contact area by CAP@CS reunion inhibited by TpPa-1 COF improve the bactericidal efficiency of the composite. The composite coating has excellent corrosion resistance, mainly because COF extends the propagation path of the corrosive medium.
研究领域:
材料科学
·
化学
·
生物医学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2020
·Vol. 12
·期 19
·2434-2442
·
IF 2.596
Lian Wen,Peng Wu,Lei-Lei Wang,Li-Zong Chen,Ming-Lin Wang,Xia Wang,Jin-Ming Lin,Ru-Song Zhao
Covalent organic frameworks with tunable porous crystallinity and outstanding stability have recently exhibited fascinating pretreatment performance as solid-phase microextraction coatings. In this report, a β-ketoenamine-linked covalent organic framework (TpPa-1) was successfully constructed through a Schiff-base-type reaction between 1,3,5-triformylphloroglucinol (Tp) and para-phenylenediamine (Pa-1). A TpPa-1 coating was then fabricated on a stainless-steel fiber for capturing trace synthetic musks. This TpPa-1 coating exhibited strong interaction with synthetic musks because of its hydrophobicity and π–π affinity. This TpPa-1-based solid-phase microextraction methodology, coupled with gas chromatography-tandem mass spectrometry, provided high enrichment factors (1214–12 487), wide linearity (0.5–1000 ng L−1), low limits of detection (0.04–0.31 ng L−1), and acceptable reproducibility (relative standard deviation, <10%) for nine synthetic musks. Recoveries at three spiked levels in three types of water samples were between 76.2% and 118.7%. These results indicated the promising applicability of the TpPa-1 as a solid-phase microextraction fiber coating for reliably detecting trace concentrations of synthetic musks in the environment.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2024
·
IF 3.8
Yiran Xia,Lushuai Wang,Yang Liu,Jiawei Liu,Quan Bai
Covalent organic frameworks (COFs) show promise as a stationary phase in high performance liquid chromatography (HPLC). However, there are only a few COFs-based stationary phases developed for HPLC separation so far. Therefore, it is crucial to not only develop more varieties of COFs-type stationary phases for HPLC separation, but also to explore the retention mechanism of solutes on these stationary phases. In this paper, a new in-situ growth method was developed to prepare β -ketoenamine COF-TpPa-1@SiO 2 composite microspheres, using spherical silica as the core material and COF-TpPa-1 fabricated by covalent conjugation of 1,3,5-triformylphloroglucinol (Tp) and p -phenylenediamine (Pa-1) as the COF shells. The resulting microspheres exhibit uniform morphology, good monodispersity, large specific surface area, narrow size distribution, and high stability. Due to diverse functional groups in the structure of COF-TpPa-1, the microspheres can offer multiple interactions, such as hydrophobic, π-π stacking and electron-donor–acceptor (EDA) between COFs and analytes. As a result, the COF-TpPa-1@SiO 2 composite microspheres can be used as a mixed-mode stationary phase for HPLC separation. The chromatographic performance and retention mechanism of the COF-TpPa-1@SiO 2 packed column were investigated by separating polar and non-polar solutes, as well as isomers, in various HPLC modes, including reversed-phase liquid chromatography (RPLC), hydrophilic interaction chromatography (HILIC), and RPLC/HILIC mixed-mode chromatography. The results showed successful separation of non-polar alkylbenzene homologues, polycyclic aromatic hydrocarbons (PAHs), and polar amines and phenols in RPLC mode. The “U-shaped” curves of retention factor with the ACN concentration in mobile phase for four nucleobases indicated that the solute retention on the column followed a mixed mode mechanism of RPLC/HILIC. Compared to a traditional C18 column, the COF-TpPa-1@SiO 2 column exhibited superior separation efficiency, stability, repeatability and reproducibility in the separation of analytes with different polarities. The column enhanced the aromatic, shape and planar selectivity for PAHs and isomers through π-π interaction and improved the separation efficiency for electron-deficient compounds due to EDA effect. At last, the column was successfully used to separate and detect the residues of 5 phenylurea herbicides (PUHs) in soil. All these results indicate the potential of COFs for chromatography applications.
研究领域:
分析化学
·
材料科学
·
色谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Wei Wang,Cong Liu,Mutian Zhang,Chenyang Zhang,Lin Cao,Chunfeng Zhang,Tengfei Liu,Debao Kong,Wen Li,Shougang Chen
It is a major challenge to combine the advantages of two kinds of two-dimensional materials to construct a heterojunction and achieve efficient photocatalytic antifouling. In this work, we covalently connected two materials MXenes and covalent organic frameworks (COFs) through the Schiff base reaction and anchored Ag nanoparticles (NPs) to prepare a Ti 3 C 2 /TpPa-1/Ag composite material with high efficiency bactericidal properties. The covalent bonding between MXene and COF greatly improved the stability of the material. Ti 3 C 2 /TpPa-1/Ag composite showed an excellent antibacterial property against S. aureus and P. aeruginosa . The fluorescence spectra of Ti 3 C 2 /TpPa-1/Ag proved that the electron transfer channels formed between the ternary materials could greatly improve the efficiency of carrier separation and prolong the life of photogenerated carriers. Density functional theory calculations showed that the synergistic catalytic effect of Ag and Ti 3 C 2 could greatly reduce the work function along the interface, and the built-in electric field between the layers drive carrier fast migration, which effectively improve the catalytic performance.
研究领域:
材料科学
·
纳米技术
·
光催化
·
抗菌材料
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）