ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Prosper Kwame Klu,Muhammad Abdul Nasir Khan,Chaohai Wang,Junwen Qi,Xiuyun Sun,Jiansheng Li
Development of efficient catalysts for peroxymonosulfate (PMS) activation and further understanding its mechanism on organic pollutants degradation is of significant importance for advanced oxidation processes (AOPs). Herein, hollow (Co, Mn) 3 O 4 catalysts were synthesized by calcination of Co, Mn containing metal-organic frameworks (MOFs) and further used to evaluate the effectiveness of organic pollutants (Bisphenol A (BPA), atrazine (ATZ), and diethyl phthalate (DEP)) degradation by PMS activation. The PMS utilization efficiency in (Co, Mn) 3 O 4 /PMS system (36.4%) was estimated to be 28.0% and 43.8% higher than that of Co 3 O 4 /PMS and Mn 5 O 8 /PMS system, respectively. Notably, the metal leaching in (Co, Mn) 3 O 4 /PMS system was significantly suppressed. The utilization efficiency also reveals an inverse proportionality relationship with BPA mineralization but decreases with increasing initial pH value. A synergy between oxides of Co and Mn was perceived to enhance PMS utilization efficiency and BPA degradation. The results indicate enhanced catalytic performance with (Co, Mn) 3 O 4 compared to Co 3 O 4 derived from Co-MOF and other reported catalysts, with 99% of BPA degradation within 4 min. The oxidation mechanism was then proposed based on the electron paramagnetic resonance (EPR) and XPS results. Our findings might have contributed to designing heterogeneous catalysts for efficient PMS utilization in AOPs.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Sun Liang,Jiang Han,Zhao Yuxuan,Wan Jun,Li Lingling,Wang Lingyun,Zhang Yang
In this study, three copper-based bimetallic oxides (Cu-M, M: Al, Fe, and Zn) were prepared via a facile hydrothermal method and used as the catalyst for the Fenton-like process to degrade bisphenol A (BPA). Compared to other bimetallic oxides, Cu-Al bimetallic oxide exhibited excellent catalytic activity. The results of XRD, TEM, SEM, and EDS illustrated that Cu-Al was synthesized as CuAlO 2 /Al 2 O 3 (named Cu-Al 2 O 3 ) with a sponge-like structure. Nitrogen sorption isotherm showed that the Cu-Al 2 O 3 was consists of mesoporous with a high specific surface area and a narrow pore size distribution. FTIR spectra indicated the formation of a Cu − ligand complex between BPA and the surface Cu of the catalyst. 90% of BPA could be degraded within 90 min when adding 0.75 g/L (Cu-7.8 wt%) Cu-Al 2 O 3 catalyst and 12.5 mM H 2 O 2 . Furthermore, it still kept over 70% removal efficiency after ten consecutive cycles, suggesting the superior stability of the catalyst. Based on the XPS and radical quenching experiments results, the Cu-Al 2 O 3 catalyst can not only improve the reduction of Cu 2+ to Cu + but also inhibit the oxidization of H 2 O 2 to generate O 2 - · radicals via the σ - C u l i g a n d c o m p l e x associated mechanism. Overall, this study indicates that Cu-Al 2 O 3 is a promising catalyst for the Fenton-like process. In addition, the strategy of the construction of the electron-rich catalytic site is an effective method to address the drawbacks of the classical Fenton process.
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高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 25
·2857-2864
·
IF 2.896
Lan Wang,Huan Zhang,Hang Shi,Baodan Jin,Xiaoyun Qin,Geng Wang,Kucong Li,Tingting Zhang,Hongzhong Zhang
In this study, we develop a highly sensitive and selective photoelectrochemical (PEC) sensor for bisphenol A (BPA) determination by combining a TiO2/CdS heterostructure with inorganic framework molecular imprinting (MI) technology. A MI-TiO2/CdS heterostructure was synthesized via successive ionic layer adsorption combined with an inorganic framework molecular imprinting method. Due to the matched energy level distribution of TiO2 with CdS, the formed heterojunction promotes photogenerated charge separation and enhanced PEC conversion. The MI-TiO2/CdS based PEC sensor exhibits higher photocurrent responses and perfect selectivity for BPA under simulated sunlight irradiation. Benefiting from the unique heterostructure and special recognition ability of MI-TiO2/CdS, the photocurrent is linear to the concentration of BPA (range from 1 to 100 pmol L−1), with a low limit detection of 0.5 pmol L−1 (S/N = 3). Meanwhile, the detection results show that the PEC sensor exhibits excellent sensitivity, high selectivity, and good stability. Furthermore, the PEC sensor was successfully applied to the real environmental sample detection of BPA, in lake and river water, domestic wastewater and tap water. This PEC sensor exhibits favourable BPA detection, and it is also a promising method by which to measure other similar environmental substances selectively and sensitively in future work.
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高影响因子
ELECTROANALYSIS
·
2021
·Vol. 34
·期 4
·743-751
·
IF 3.223
Yingying Yang,Siyao Liu,Penghui Shi,Guohua Zhao
A label-free DNA-based electrochemical biosensor owning high sensitivity and selectivity has been established for detecting bisphenol A in a wide range of applications. Coupling the high electrochemical performance of graphene oxide-thionine-Au nanomaterial with the specific binding capacity of the aptamers to BPA, the monitoring of trace amount of BPA was realized, the detection limit was 3.3 pg ⋅ mL −1 with strong anti-interference. Besides, using molecular docking, it was found that BPA binds to the bases DC-49, DC-51, DG-52, DG-53 and DA-63 on the aptamer via hydrogen bonding and π-π stacking interactions. Finally, the biosensor had been successfully applied in different real samples.
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MOLECULES
·
2021
·Vol. 26
·期 8
·2350
·
IF 4.412
Jianing Zhang,Fengjie Yu,Yunmin Tao,Chunping Du,Wenchao Yang,Wenbin Chen,Xijuan Tu
In the present work, a novel sample preparation method, micro salting-out assisted matrix solid-phase dispersion (μ-SOA-MSPD), was developed for the determination of bisphenol A (BPA) and bisphenol B (BPB) contaminants in bee pollen. The proposed method was designed to combine two classical sample preparation methodologies, matrix solid-phase dispersion (MSPD) and homogenous liquid-liquid extraction (HLLE), to simplify and speed-up the preparation process. Parameters of μ-SOA-MSPD were systematically investigated, and results indicated the significant effect of salt and ACN-H2O extractant on the signal response of analytes. In addition, excellent clean-up ability in removing matrix components was observed when primary secondary amine (PSA) sorbent was introduced into the blending operation. The developed method was fully validated, and the limits of detection for BPA and BPB were 20 μg/kg and 30 μg/kg, respectively. Average recoveries and precisions were ranged from 83.03% to 94.64% and 1.76% to 5.45%, respectively. This is the first report on the analysis of bisphenol contaminants in bee pollen sample, and also on the combination of MSPD and HLLE. The present method might provide a new strategy for simple and fast sample preparation of solid and semi-solid samples.Keywords:sample preparation;matrix solid-phase dispersion;salting-out;homogenous liquid-liquid extraction;bisphenol;bee pollen
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高影响因子
TALANTA
·
2021
·
IF 6.057
Yi Zhang,Lingling Wang,Wen-Long Wang,Cheng Yang,Yongwei Feng,Xueli Shi
The continuous intake of 17β-estradiol (E2) residue from animal-derived food may pose a threat to the health of consumers, so the rapid screen and detection of E2 is very necessary. Although visual immunochromatographic strip (ICS) has played a great role in food safety control such as the screen of many food contaminants, it cannot meet the requirements for E2 detection due to the insufficient sensitivity of traditional visual ICS and the low concentration range of estrogen in food. Here, we developed a dual-mode ICS strategy to achieve rapid and highly sensitive detection of E2. Based on the visual detection mode of a competitive ICS, the afterglow detection mode working in fluorescence resonance energy transfer mechanism was introduced by using the afterglow particles (APs) as energy donor and gold nanoparticles (AuNPs) as energy acceptor. In this method, large APs of micron size with superior afterglow were applied as the test zone-fixed fluorescence signal source, thus the contradiction between migration and afterglow characteristics was skillfully resolved. In addition, a 6 W UV lamp was used as the light source to excite APs, and a smartphone was used to capture an image of 0.5 s after the UV light was turned off to effectively remove the autofluorescence from the strips and improve the signal-to-noise ratio. The limit of detection of this afterglow mode was 0.5 ng/mL, twenty times more sensitive than that of visual mode (10 ng/mL). The strategy has been successfully applied to the detection of estradiol in milk and verified by HPLC–FLD.
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高影响因子
TALANTA
·
2021
·
IF 6.057
Feifei Lu,Jian Lin,Chenchen Lin,Guomin Qi,Xucong Lin,Zenghong Xie
Covalent organic frameworks (COFs) showed great promise in effective adsorption of target molecule via size selectivity. Although various magnetic 2D COFs composites have been studied and exhibited the intensive applications, the incorporation of 3D COFs and magnetic nanoparticles to form a new class of magnetic adsorbents with enhanced function still has no reports. Herein, a novel Fe 3 O 4 @3D COF with heteroporous structure matching to the sizes of bisphenol A (BPA) was firstly synthesized for better adsorption of BPA than common magnetic 2D-COFs. Three Fe 3 O 4 @3D COFs nanospheres were synthesized under the solvothermal conditions in autoclave, and the optimum Fe 3 O 4 @3D-COF denoted as Fe 3 O 4 @COF-TpTAM (Tp, 1,3,5-triformylphloroglucinol; TAM, tetra(p-aminophenyl)-methane) was selected and employed. Detailed characteristics of Fe 3 O 4 @COF-TpTAM were evaluated via various techniques including TEM , FTIR, TGA , XRD and BET. Excellent chemical and thermal stability, high surface area (294.6 m 2 g −1 ) and pore volume (0.2 m 3 g −1 ) with multiple pore sizes comparable with the simulated three-dimensional sizes of BPA were exhibited. A high adsorption capacity of BPA up to 209.9 mg/g that was better than common 2D-COFs was achieved, and the sensitive MSPE-LC-MS method with wide linear range (10–5000 pg/mL), low detection limit (4 pg/mL, S/N = 3) was built. Satisfactory recoveries of BPA as 93.8 ± 1.4%–101.4 ± 5.1% (n = 3) and 100.4 ± 1.9% ~ 107.3 ± 1.2% (n = 3) were obtained in milk and river water samples, respectively. This work demonstrates the promising application of Fe 3 O 4 @3D COF as efficient adsorbents of trace BPA, and opens up a new access for the efficient MSPE in sample pretreatment for food or environmental safety analysis.
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高影响因子
CARBON
·
2021
·
IF 9.594
Pengxiang Qiu,Ziwen Cheng,Ningxuan Xue,Yujing Zeng,Xuan Kai,Shuai Zhang,Chenmin Xu,Fengling Liu,Zhaobing Guo
The combination of sulfate radical-mediated advanced oxidation process (SA-AOP) and photocatalysis is researched as a highly efficient strategy for pollutant degradation in recent decades. To systematically study the synergistic effect between photocatalysis and peroxymonosulfate (PMS) induced SA-AOP, graphene oxide (GO) coupled graphitic carbon nitride (CN) composites were synthesized as catalyst. About 98% of bisphenol A was decomposed in CNGO/PMS/light system, which was significantly higher than that in CNGO/PMS or CNGO/light system, demonstrating the strong synergistic effect between photocatalysis and SA-AOP. CNGO was deactivated in catalyst/PMS system, but not in catalyst/PMS/light system, showing that the deactivation of CNGO in the presence of sulfate radicals was inhibited by the photocatalysis. The photogenerated electrons may directly reduce the oxidized GO, or react with the oxidative species which may oxidize GO, and thus maintain the activity of CNGO. In addition, the system temperature was elevated due to the light-to-heat conversion on GO. The increased reaction temperature accelerated the degradation reaction due to the improved the charge separation and molecular collision. This work explains the synergy effect between photocatalysis and SA-AOP from different perspectives, and provides a new idea to improve the reusability of carbonaceous catalyst.
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高影响因子
ACS Omega
·
2021
·
IF 3.512
Libin Wan,Huoliang Gao,Ge Yan,Haidong Gao,Mantang Chen
Molecularly imprinted polymers (MIPs) with high specific recognition capability are promising in environmental remediation. However, traditional MIPs usually show poor specific binding affinity toward templates in pure aqueous medium, thus greatly limiting their practical applications in wastewater treatment. Herein, we proposed a facile and versatile method to synthesize a water-compatible hierarchically porous MIP (HP-MIP), in which a metal–organic gel (MOG) was formed by in situ assembly and acted as a removable structural modulator. Remarkably, the integration of the MOG modulator and template imprinting defects significantly improved the specific template binding affinity of HP-MIP in water. The adsorption behavior of HP-MIP fitted well with the heterogeneous Freundlich isotherm, suggesting that HP-MIP possessed greater site heterogeneity to sildenafil than HP-NIP, which confirmed the efficiency of HP-MIP for the removal of sildenafil from water. This approach provides an important pathway to prepare water-compatible porous MIP for efficient removal of highly toxic organic pollutants from wastewater.
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高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Bo Sun,Yiqiao Zhang,Zhaoyu Gong,Jian Zhang,Jing Zhang
Permanganate is one of common oxidants used for organic pollutant abatement in water treatment . This study showed that the degradation rate of bisphenol A (BPA) by permanganate at pH 5.0 in the presence of aniline is much higher than that in the absence of aniline. 2, 5, and 10 μM of aniline enhanced BPA degradation rate by 104%, 326% and 601%, respectively. Colloidal MnO 2 was formed through the reduction of permanganate by aniline and contributed to BPA oxidation considerably. The reactivity of MnO 2 is sensitive to pH and is high under acidic conditions, resulting in the observed enhancement of aniline on BPA removal by permanganate at pH < 7.0. The role of MnO 2 was further confirmed by the relationship of MnO 2 formation and BPA/aniline removal, the inhibitory effect of Ca 2+ on the oxidation of BPA in the presence of aniline. Besides the aniline/BPA system, the pollutants which react with permanganate rapidly are likely to enhance the degradation of coexisting pollutants which show high reactivity towards MnO 2 . Due to the reduction of permanganate and stabilization of the in situ formed colloidal MnO 2 by water matrix, the oxidation rate of pollutant in real water is higher than that in pure water.
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高影响因子
POLYMER
·
2021
·
IF 4.43
Li Pei,Sipei Zhao,Hailong Li,Xin Zhang,Xiaotian Fan,Weiwei Wang,Congyun Zhang,Guizhe Zhao,Zhi Wang
This research aimed to develop a combustion synthesis method to decrease curing temperature of benzoxazine with enhanced thermal stability and mechanical properties . In(NO 3 ) 3 was selected as an oxidant and acetylacetone was employed as a fuel to form a combustion system . The mechanism of combustion synthesis that involved curing benzoxazine was studied, and thermal stability and mechanical properties of cured products were discussed. It was revealed that the proposed method could significantly reduce the curing temperature of benzoxazine, and the initial curing temperature dropped to below 100 °C. Compared with polybenzoxazine, proposed method indicated an improved thermal stability, and the highest carbon yield at 800 °C was increased by 25.0%. In addition, the possible effects of the proposed method on coatings were investigated. The impact resistance, hardness, and surface adhesion were significantly improved to 7J, 6H, and 5B, respectively, with excellent anti-corrosive properties including a corrosion rate of 1.39 × 10 −3 mm/year, indicating its great application potential in coating. The formation of a high content of arylamine Mannich structures and a small amount of In 2 O 3 after curing could justify the improvement of thermal stability and mechanical properties of polybenzoxazine. The proposed method not only provided a facilitate way to cure benzoxazine, but also showed to be significant for modulating the chemical structures and properties of cured benzoxazine.
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高影响因子
Chemistry Africa-A Journal of the Tunisian Chemical Society
·
2021
·Vol. 4
·期 2
·367-377
·
IF 0
Zou Miaomiao,Zou Suyan,Hu Chunyan,Lin Xiaoyun,Ni Yongnian
In this paper, graphite phase carbon nitride (g-C 3 N 4 ) was prepared by one-step high temperature thermal decomposition method, and layered g-C 3 N 4 was prepared by protonation with concentrated hydrochloric acid. The morphology and composition of g-C 3 N 4 were characterised by transmission electron microscope (TEM), energy dispersive spectroscopy (EDS) and X-ray powder diffraction (XRD). Furthermore, the AuNPs-g-C 3 N 4 /GCE was constructed by coating method and potentiostatic deposition method, and the construction process and resistance change of the electrodes were characterised by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The experimental results indicated that the AuNPs-g-C 3 N 4 /GCE has excellent electrocatalytic performance for bisphenol A (BPA) and 4-n-octylphenol (OP). Under optimized experimental conditions, BPA and OP were detected by differential pulse voltammetry (DPV) at the AuNPs-g-C 3 N 4 /GCE. The linear ranges were 0.1–6.5 µmol L −1 and 0.1–3.8 µmol L −1 for BPA and OP, wtih the detection limits of 0.0176 µmol L −1 and 0.0324 µmol L −1 , respectively. In addition, the AuNPs-g-C 3 N 4 /GCE showed satisfactory reproducibility and stability and can be successfully applied to monitor of BPA and OP in baby formula samples.
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