CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Xiaowen Jiang,Junteng Zhao,Tong Yu,Yijun Li,Xiwen He,Langxing Chen,Yukui Zhang
Covalent organic frameworks (COFs) have attracted increasing interest as adsorbents in water treatment, but the lack of high-performance adsorbents materials and effective morphological structures limits their practical application. In this work, a novel quinoline-linked COFs (COF-QL-Ph) with high crystallinity was synthesized by post-synthetic-modification (PSM). Firstly, the precursor organic ligands of imine-linked COFs were directly electrospinning with polyacrylonitrile (PAN) solution as the seeded nanofibers. Subsequently, the imine-linked COFs formed from 1,3,5-benzenetricarboxaldehyde (TFB) and 2,6-diaminonaphthalene (2,6-DAN) were grown on the seeded PAN nanofibers. Finally, self-supporting imine-linked COFs hollow nanofibers were obtained by etching the polymeric substrates. These were then transformed into quinoline-linked COF-QL-Ph nanofiber through the Povarov reaction between phenylacetylene and the matrix imine-linked COFs. The resulting COF-QL-Ph nanofibers exhibit a developed hollow structure and high porosity for effective adsorption of chlorinated phenols in water. The adsorption behavior of 2,4-dichlorophenol (2,4-DCP) on COF-QL-Ph nanofibers followed the Langmuir model, and the maximum adsorption capacity was 616.9 mg g −1 . The abundant benzene rings and quinoline structures in COF-QL-Ph nanofibers provided a great number of sites for the interaction with 2,4-DCP, which were confirmed by simulation and adsorption characterization. As expected, the self-supporting hollow structure of COF-QL-Ph nanofibers greatly improved the mass transfer rate of adsorbed analytes and accelerated the kinetic process. Furthermore, COF-QL-Ph nanofibers exhibited good structural stability and high recovery performance after six adsorption–desorption cycles. Thus, COF-QL-Ph nanofiber represents a highly promising adsorbent suitable for purifying chlorinated phenols in environmental waters.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Zhiwei Zhao,Yu Li,Fei Wang,Zhitao Xu,Sai Zhang,Li Li,Junyu Fan,Jie Liu
Monitoring and regulating the formation of toxic byproducts in advanced oxidation processes (AOPs) is of great significance for their practical application in water treatment. In this work, we found that dichloroacetonitrile (DCAN), a common N-containing byproduct in chloramination disinfection, can be formed with the co-presence of g-C 3 N 4 and chloride in a peroxymonosulfate (PMS) system. The measured value was 12.01 μM within 12 h under the given conditions. Structure analysis of raw and used g-C 3 N 4 demonstrated that g-C 3 N 4 decomposition indeed occurred, and C = N bonds acted as primary active sites, releasing N resources for subsequent DCAN formation. Additionally, multiple parameters, including the reactant (i.e., g-C 3 N 4 , PMS, Cl - , phenol) dose and solution pH, were observed to remarkably affect the yield of DCAN. Phenol was identified as the organic precursor of DCAN and may cooperate with inorganic chloramine to promote DCAN formation via the decarboxylation pathway. This study highlights the generation of DCAN in N-involved catalyst-based AOPs and improves understanding of the DCAN formation mechanism.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Yanqing Cong,Yudi Wang,Dongchen Lv,Jiayi Gao,Kuangda Chen,Sainan Sun,Xiaoran Wang,Shi-Wen Lv
With more and more attention to health, developing a simple and effective method for detecting phenolic compounds is an urgent and challenging task. In this context, Mn-doped CoP (referred to as Mn-CoP) with a nanocage interior architecture has been successfully constructed. The formation of a hollow structure exposes more active sites, while the incorporation of Mn ion reduces the charge transfer resistance and accelerates the charge transfer. Consequently, Mn-CoP effectively provides electrons to activate H 2 O 2 and O 2 producing OH • and O 2 • , demonstrating excellent peroxidase-like and oxidase-like activities. Given its strong oxidase-like activity, Mn-CoP enables a straightforward colorimetric assay for detecting hydroquinone using 3,3′,5,5′-tetramethyl benzidine (TMB) as colorimetric substrate. Interestingly, the developed colorimetric detection method exhibits a broad linear range and a low limit of detection (LOD) for hydroquinone, showing good potential for application even in real samples. Detailed analyses reveal that the doped Mn ions serve as Lewis acid sites directly reacting with the amino functional group in TMB. The Lewis acid-base reaction between Mn-CoP and TMB is crucial for the chromogenic reaction of TMB. Moreover, doping Mn ion to enhance the oxidase-like activity of the nanozyme is a simple and feasible modification strategy with universal applicability. This work provides a valuable reference for designing nanozymes with oxidase-like activity.
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高影响因子
MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Yifan Shao,Sainan Sun,Xinyun Li,Liwen Fan,Xinyi Shen,Yanqing Cong,Shi-Wen Lv
It is very meaningful to develop simple and effective methods for detecting hazardous substances. Herein, a newly-designed Mn 3 O 4 -based composite with oxygen vacancy is synthesized and employed as oxidase-like mimic for conducting chromogenic analysis. After loading Mn 3 O 4 in hollow carbon sphere (HCS), the hydrophobicity of Mn 3 O 4 is remarkably enhanced, thereby creating a microscopic three-phase interface to boost the capturing ability towards O 2 . Interestingly, hollow structure of HCS can provide the spatial confinement effect for Mn 3 O 4 , shortening mass transfer process and improving catalytic activity. Thus, HCS/Mn 3 O 4 composite possesses low interfacial resistance and rapid charge transfer rate. More importantly, HCS/Mn 3 O 4 composite can simulate the activity of oxidase-like mimics, which can oxidize colorless 3,3′,5,5′-tetramethyl benzidine (TMB) to blue oxidized TMB (oxTMB) in a short time. Further analysis indicates that O 2 •− plays an important role, and the direct oxidation of TMB over HCS/Mn 3 O 4 composite also plays a part in the color reaction of TMB. Based on the cascade reactions among TMB, HCS/Mn 3 O 4 and target compound (namely hydroquinone and Cr 6+ ), a simple chromogenic sensing method with broad linear range and low LOD for detecting hydroquinone and Cr 6+ is proposed. In short, current study can give a valuable reference for the design of enzyme mimics and the research on chromogenic mechanism.
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高影响因子
WATER RESEARCH
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2024
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IF 11.4
Liang Zeng,Sizhe Yang,Quan Chen,Wang Fu,Min Wu,Patryk Oleszczuk,Bo Pan,Baoshan Xing
Phenols are the widely detected contaminants in the aquatic environment. Pyrogenic carbon (PyC) can mediate phenols degradation, but the specific properties of PyC or phenols influencing this reaction remain unknown. The present study investigated the kinetic process and mechanism of removal of various phenols by different PyC in aqueous phase system. To avoid the impact of the accumulated degradation byproducts on the overall reaction, we conducted a short-term experiment, quantified adsorption and degradation, and obtained reaction rate constants using a two-compartment first-order kinetics model. The adsorption rate constants ( k a ) of phenols by PyC were 10-220 times higher than degradation rate constants ( k d ), and they were positively correlated. Interestingly, no correlation was found between k d and common PyC properties, including functional groups, electron transfer capacities, and surface properties. Phenols were primarily attacked by •OH in the adsorbed phase. But neither the instantly trapped •OH, nor the accumulated •OH could explain phenol degradation. Chemical redox titration revealed that the electron transfer parameters, such as the electron donating rate constant ( k ED ) of PyC, correlated well with k d (r>0.87, P < 0.05) of phenols. Analysis of 13 phenols showed that E gap and E LUMO negatively correlated with their k d , confirming the importance of the electronic properties of phenols to their degradation kinetics. This study highlights the importance of PyC electron transfer kinetics parameters for phenols degradation and manipulation of PyC electron transfer rate may accelerate organic pollutant removal, which contributes to a deeper understanding of the environmental behavior and application of PyC systems.
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PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Yang Zheng,Tongkui Yue,Guanghui Cui,Yi Sun,Wei Liu,Jun Liu,Zhanpeng Wu
The interfacial interaction between fibers and polyphosphazene is a crucial factor for efficient ablative resistance. Herein, a series of polyphosphazenes with aryloxy and substituted-aryloxy side groups were designed and synthesized, guided by molecular dynamics simulation. Effects of the type and position of the substitutions on properties of polyphosphazenes such as glass transition temperature (Tg) were investigated. The introduction of polar chlorine-substituted side groups increases the interfacial interaction of polyphosphazenes with fibers, as evidenced by the binding energy and the number of hydrogen bonds, and the composites exhibited enhanced mechanical and ablative properties. The linear ablation, mass ablation, and charring rate of the composite reach 0.0148, 0.041, and 0.088 mm/s, respectively, which is superior to the composites using conventional rubbers as the matrix. These results make the chlorinated polyphosphazene a competitive candidate for thermal protection under the high-temperature service environment of vehicles and rockets.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Jianqiao Liu,Jinli Wang,Jiang Guo,Kai Yan,Jingdong Zhang
The coupling of photoelectrocatalysis (PEC) and enzymatic catalysis was explored for efficient treatment of practical phenol-containing coking wastewater outdoors. The developed enzymatic-photoelectrocatalytic (EPEC) system consisted of three-dimensional dual photoelectrodes fabricated with carbon fiber cloth (CFC), namely a CFC-supported WO 3 photoanode with oxygen vacancies and a CFC-supported Au-BiOBr photocathode with immobilized horseradish peroxidase (HRP). The experimental results and computational fluid dynamics study revealed that dual CFC-based photoelectrodes with three-dimensional network structures could optimize the fluid diffusion on the electrode surface and enhance the efficiency of pollutant degradation. Further investigation indicated that the introduction of oxygen vacancies promoted the PEC oxidation activity of the WO 3 photoanode while the Au nanoparticles modification was favorable to improving the immobilization of HRP and PEC generation of H 2 O 2 on BiOBr photocathode. Moreover, photovoltaic (PV) cells were integrated in the EPEC system to provide applied potential and promote the utilization of solar irradiation. The mineralization rate of coking wastewater reached 88.5% using the PV-integrated EPEC system driven by natural solar energy, which demonstrated potential for treating actual industrial wastewater.
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PubMed
高影响因子
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