CHEMOSPHERE
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2022
·
IF 8.943
Qingyi Zeng,Jing Tan,Beibei Gao,Tao Cai,Qingyan Zhang,Yi-Lin Liu,Sheng Chang,Shuaifei Zhao,Suqing Wu
A cobalt (Co)-doped perovskite molybdenum trioxide (α-MoO 3 ) catalyst (Co-MO) was synthesized by a facile pyrolysis strategy and used for degrading various organic contaminants via peroxymonosulfate (PMS) activation. The doped Co was inserted in the inter space between the octahedron [MoO 6 ], facilitating the growth of the α-MoO 3 crystal on the [010] direction. This unique structure accelerated the activation of PMS as the Co-MO could function as a carrier for electron transfer to facilitate the Co(II)/Co(III) cycle in the Co-MO/PMS system. As a result, the Co-MO/PMS system showed noticeable activity for removing 100% bisphenol A (BPA) under a broad conditions within 30 min. The radical quenching test and electron paramagnetic resonance analysis revealed that singlet oxygen ( 1 O 2 ) was the main active species for BPA degradation in the Co-MO/PMS system, while free radicals, such as O 2 •- , SO 4 •- and •OH, were also produced as the intermediate species. Furthermore, the carrier mechanism may enable the Co-MO/PMS system maintain relatively high performance during repeat use, and also excellent adaptability was revealed by the well function in various water matrices and high activity in degrading various refractory organic pollutants. Our findings pave a useful avenue for the rational design of novel cobalt-doped catalysts with high catalytic performance toward wide environmental applications.
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高影响因子
Journal of Cleaner Production
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2022
·
IF 11.072
Mingyu Liu,Chenping Gao,Runping Han,Lingbo Qu
A citric acid-crosslinked β-cyclodextrin modifying hydrolyzed polyacrylonitrile membrane (β-CD-HPAN) was designed for bisphenol A (BPA), tetracycline (TC), and oxytetracycline (OTC) uptake. β-CD-HPAN was successfully prepared with several characterizations and optimized synthesis conditions. In batch mode, there was a good removal capacity toward BPA in a broad pH range, the uptake of TC and OTC (TCs) possessed a relatively high adsorption effect at pH of 3.0–4.0. The addition of salinity had a negative result on adsorption. The isotherm behaviors exhibited a monolayer equilibrium removal capacity ( q e ) of 45.3 mg/g for BPA, with heterogeneous q e of 124 mg/g and 98.4 mg/g for TC and OTC, respectively. These processes were accorded with Koble-Corrigan isotherm model, and the kinetic behaviors followed Elovich equation. The binary experiment elucidated that BPA and TC/OTC removal onto β-CD-HPAN was independent from each other. β-CD-HPAN also elucidated good regeneration performances. Adsorption mechanisms were proposed that β-CD cavities on β-CD-HPAN mainly contributed to entrap molecules of non-polar BPA, carboxyl and hydroxyl groups provided binding sites for polar TCs. The membrane owned antibacterial capacity against gram-positive S. aureus . Overall, β-CD-HPAN membrane has great potentials in wastewater purification to adsorb BPA and TCs due to its green synthetic procedure, easy separation, bifunctional groups, and low cost.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 10
·e53578
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IF 3.057
Jiamei Liu,Weichen Sheng,Rui Yang,Yu Liu,Yin Lu,Kan Zhang
A series of bio-based fluorin-free main-chain type benzoxazine precursors were synthesized via bisphenol A/bisphenol F/diallyl bisphenol A, Priamine 1074 and paraformaldehyde by Mannich condensation reaction. Chemical structures of these obtained main-chain type precursors were characterized by FT-IR and NMR spectroscopies. The polymerization processes were studied by differential scanning calorimeter (DSC) and in situ FT-IR analysis. Besides, the contact angle and surface free energy of polybenzoxazine coatings were measured by water contact angle instrument. Moreover, the thermal performance of the resulting polybenzoxazine thermosets were evaluated by dynamic mechanical analyzer (DMA) and thermogravimetric analysis (TGA). Through the above various measurements, the newly developed bio-based main-chain type polybenzoxazine resins show good thermal stability and low surface free energy, suggesting great potential for applications as high-performance resin matrix.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Sui-Qin Yang,Zheng-Qian Liu,Yu-Hong Cui,Ming-Kui Wang
Ubiquitous chloride ion (Cl - ) in wastewaters usually inhibits the degradation of organic contaminants and generates numerous toxic chlorinated products in conventional degradation-based advanced oxidation processes (AOPs). Herein, a more Cl - tolerant polymerization-based electrochemical AOP for organic contaminants abatement and simultaneous organic resource recovery was demonstrated with eight typical organic contaminants and two real industrial wastewaters for the first time. This process can significantly promote dissolved organic carbon (DOC) abatement in the presence of Cl - , differing greatly from conventional degradation-based processes. Compared to sulfate radical (SO 4 •- ) (or hydroxyl radical (HO • )), dichloride radical (Cl 2 •- ) derived from Cl - has moderate reactivity towards most contaminants, which facilitates the organics polymerization as it ensures the formation of polymerizable organic radicals while inhibiting their excessive degradation. Thus, high DOC abatement (over 75 %) and high organic resource recovery ratio (48–79 % separable organic-polymer yield) can be achieved for most contaminants. Both soluble chlorinated compounds and solid chlorinated polymers are formed in the presence of Cl - . The chlorinated products (e.g. chlorophenols) can be polymerized as new monomers , thus the concentration of dissolved organic chlorinated products is much lower than that in conventional degradation-based process. The tolerance of the present process to Cl - is tested in real coking wastewaters, and exceeding 60 % of the abated chemical oxygen demand (COD) is obtained in the form of recoverable organic-polymers.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Tengfei Li,Haoran Wei,Hanzhong Jia,Tianjiao Xia,Xuetao Guo,Tiecheng Wang,Lingyan Zhu
The application of Ag3PO4 as a commonly used photocatalyst is limited by its high recombination potency and electron–hole pairs with weak redox potential. It is significant to enhance the photocatalytic activity of Ag3PO4 by coupling with a wide band gap semiconductor. In this study, Ag2WO4 was selected to promote the photocatalysis of Ag3PO4 giving that it has wide band gap energy and strong redox potential. A facile chemical precipitation method was applied to assemble Ag2WO4 nanoparticles on the surface of Ag3PO4 to form an Ag2WO4/Ag3PO4 heterojunction. The Ag2WO4/Ag3PO4 heterojunction containing 7.5% molar mass of WO42– (7.5W) displayed the most superior photocatalytic efficiency under simulated solar light irradiation: 93% of bisphenol A was degraded just within 10 min and above 75% was mineralized within 30 min. The degradation reaction rate constant was 3 times higher than that of the pure Ag3PO4. The excited high-level-energy electrons on the conduction band of Ag3PO4 would transfer thermodynamically to the conduction band of Ag2WO4, and the generated valence band holes on Ag2WO4 easily shifted to the low-energy valence band of Ag3PO4, resulting in high separation of electron–hole pairs. The photogenerated holes and superoxide radical species played predominant roles in the reaction system.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 2
·1-9
·
IF 5.479
Deng Ze-Hui,Wang Xia,Wang Xiao-Li,Gao Cui-Ling,Dong Liang,Wang Ming-Lin,Zhao Ru-Song
A magnetic covalent organic framework (Fe 3 O 4 @COF) with core–shell structure was fabricated at room temperature and used as an adsorbent for magnetic solid-phase extraction of polar endocrine-disrupting phenols (4-n-nonylphenol, 4-n-octylphenol, bisphenol A and bisphenol AF). The sorbent was characterized by transmission electron microscopy, FTIR, powder X-ray diffraction and other techniques. The main parameters governing the extraction efficiency were optimized. The phenols were quantified by HPLC with fluorometric detection. The method has attractive features such as low limits of detection (0.08–0.21 ng.mL −1 ), wide linear ranges (0.5–1000 ng.mL −1 ), and good repeatability (intra-day: 0.39%–4.99%; inter-day: 1.57%–5.21%). Satisfactory results were obtained when the developed method was applied to determine the four target pollutants in real world drink samples with spiked recoveries over the range of 81.3~118.0%. This indicates that the method is a powerful tool for the enrichment and determination of endocrine-disrupting phenols in drink samples.
A magnetite based covalent organic framework (Fe 3 O 4 @COFs) was synthesized with TPAB, TPA and Fe 3 O 4 . It was used for magnetic solid-phase extraction of endocrine-disrupting phenols from plastic-packaged tea drink samples coupled with liquid chromatography (LC) for determination.
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POLYMER INTERNATIONAL
·
2019
·Vol. 68
·期 4
·805-811
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IF 2.433
ChangAn Yang,He Huang,Tuo Ji,KeSheng Zhang,LeQun Yuan,CongShan Zhou,KeWen Tang,JianMin Yi,XiaoBo Chen
Water pollution problems pose a serious threat to the health of humans and other living organisms due to the increasing global contamination of various water resources by organic micropollutants, such as plastic components, dyes and pesticide intermediates. It has been a challenging problem to remove these organic micropollutants, despite various attempts. Here, we report a novel, cost-effective and water-insoluble crosslinked β-cyclodextrin polymer for the efficient removal of various organic micropollutants from wastewaters with excellent adsorption capacity, large removal rate, robust performance and reusability. This polymer can remove 93% of bisphenol A within 1 min with an equilibrium uptake of 38 mg g −1 and a maximum adsorption capacity at equilibrium of 139 mg g −1 . This is the fastest removal performance that has been reported so far, showing a bright future towards practical applications. © 2019 Society of Chemical Industry
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Nanomaterials
·
2019
·Vol. 9
·期 3
·402
·
IF 4.034
Hongyu Wang,Chaohai Wang,Junwen Qi,Yubo Yan,Ming Zhang,Xin Yan,Xiuyun Sun,Lianjun Wang,Jiansheng Li
Prussian blue and its analogues (PBA) based nanomaterials have been widely applied to removing pollutants in the recent years. However, easy aggregation and poor recycling largely limit their practical applications. In this work, spiderweb-like Fe-Co Prussian blue analogue/polyacrylonitrile (FCPBA/PAN) nanofibers were prepared by electrospinning and applied to degrading bisphenol-A (BPA) by activating peroxymonosulfate (PMS). Detailed characterization demonstrated that a high loading of FCPBA (86% of FCPBA in FCPBA/PAN) was successfully fixed on the PAN nanofibers. 67% of BPA was removed within 240 min when 500 mg·L−1PMS and 233 mg·L−1FCPBA/PAN were introduced in 20 mg·L−1BPA solution at initial pH of 2.8. Electron paramagnetic resonance (EPR) and radical inhibition experiments were performed to identify the possible degradation mechanism. For comparison, a low loading of FCPBA nanofibers (0.6FCPBA/PAN nanofibers, 43% of FCPBA in FCPBA/PAN) were also prepared and tested the catalytic performance. The results showed that the activity of FCPBA/PAN was much higher than 0.6FCPBA/PAN. Furthermore, a FCPBA/PAN packed column was made as a reactor to demonstrate the reusability and stability of FCPBA/PAN nanofibers, which also exhibited the bright future for the industrial application. This work makes it possible to fabricate efficient PBA nanocatalysts with excellent recyclability and promotes the application of PBA in industrial areas.Keywords:Fe-Co Prussian blue analogues;electrospinning;peroxymonosulfate;BPA
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Liying Wu,Yongbo Yu,Qian Zhang,Junming Hong,Ji Wang,Yuecheng She
Through direct and indirect radical mechanism of peroxymonosulfate (PMS) activation, novel CoFe 2 O 4−x catalysts were successfully developed via hydrogen calcination to overcome popular disadvantages of the dependence on pH. Bisphenol A (BPA) was selected as the model pollutant to decipher the mechanism of catalysts for peroxymonosulfate (PMS) activation. Possible degradation pathways of Bisphenol A were proposed via analysis of liquid chromatograph mass spectrometer (LC-MS). The findings indicated that catalytic activation of CoFe 2 O 4−x was not dependent upon the initial pH, as the direct and indirect radicals seemed to be generated in parallel. FTIR analysis confirmed that surface hydroxyl groups were actively involved in the activation of PMS under alkaline conditions. During the reaction, the oxygen defects promoted electron transfer and participated in the redox cycle from Co 3+ /Fe 3+ to Co 2+ /Fe 2+ to generate 1 O 2 and O 2 − . Hydroxyl (OH ) and sulfate (SO 4 − ) radicals were generated on the surface of CoFe 2 O 4−x by the synergistic interactions among oxygen defects, transition metal, and surface hydroxyl groups. To the best of our knowledge, this combined mechanism of direct and indirect radical generation for advanced oxidation was a first-attempt study to be disclosed in public domain.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Jinhong Fan,Hehe Qin,Simin Jiang
Peroxymonosulfate (PMS) is an alternative to hydrogen peroxide in advanced oxidation processes. Herein, we present a simple one-pot synthetic approach for the Mn-doped graphite phase carbon nitride (g-C 3 N 4 ) materials and make it as a catalyst to activate PMS for acetaminophen (ACT) degradation. Fabricated Mn-g-C 3 N 4 composites (MnCN) were characterized by SEM, EDS, XRD, XPS, and FTIR. Results showed that Mn was uniformly dispersed in the structure of g-C 3 N 4 mostly in the form of Mn-N coordination. The effects of pH, contents of doped Mn, catalyst dosage, and reusability of catalyst and corresponding kinetic study were conducted to determine the catalytic performance of MnCN. High reaction efficiency was obtained in a wide pH range of 3.2–9. 100% removal of ACT in 15 min under optimized conditions with initial pH 6.5, 0.8 g/L of PMS and 200 mg/L of catalyst of 0.5-MnCN. Additionally, the reaction mechanism of the PMS/MnCN system was investigated using the electron spin resonance technique, quenching studies as well as different organics with electron-donating or electron-withdrawing groups. No PMS decomposition was detected without substrates. No inhibition effect by ethanol or tert -Butyl alcohol and complete inhibition effect by benzoquinone and partly by furfuryl alcohol, as well as ESR spectrum of TEMP- 1 O 2 were observed, suggesting that the activation of PMS proceeded in a new way, which is different from traditional sulfate radical-based advanced oxidation processes. A possible mechanism was proposed for ACT removal. PMS was first bounded to Mn-N sites to generate the superoxide anion. Then singlet oxygen produced by superoxide anion would react with ACT by replacing the electron-donating group of acylamino.
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Food Analytical Methods
·
2018
·Vol. 12
·期 3
·705-711
·
IF 2.245
Tu Xijuan,Wu Siyuan,Liu Weiyi,Gao Zhaosheng,Huang Shaokang,Chen Wenbin
An analytical method based on sugaring-out assisted liquid-liquid extraction (SULLE) and HPLC-fluorescence detection has been developed for the determination of bisphenol A (BPA) and bisphenol B (BPB) in royal jelly. Experimental parameters of SULLE including the extraction solvent, amount of phase separation agent, initial concentration of acetonitrile (ACN), and sample size were investigated. The optimal SULLE procedure involves 0.3 g sample extracted by 2 mL ACN-water mixture (50%, v / v ), followed by phase separation with the addition of 0.4 g glucose. The obtained extract was injected into the reversed-phase HPLC system without clean-up step. The chromatography separation of BPA and BPB from royal jelly matrix was achieved in the mobile phase composed of 40% ACN and 60% water with isocratic elution at 1.0 mL/min. Limits of quantification for BPA and BPB were 40 μg/kg and 45 μg/kg, respectively, and limits of detection for BPA and BPB were 16 μg/kg and 18 μg/kg, respectively. Average recoveries of BPA and BPB at three spiked levels were in the range of 88.32~93.59% and 95.14~97.48%, respectively. Precision expressed as relative standard deviations (RSDs) in the interday and intraday analysis were all lower than 5%. The developed method was applied to the analysis of ten commercial and eight raw royal jelly samples. Results indicated that none of BPA and BPB were detected in these 18 samples. The proposed method is simple, fast, and sensitive, and could be used for the monitoring of BPA and BPB contamination in royal jelly.
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COMPOSITE STRUCTURES
·
2018
·
IF 4.101
Aboubakr Medjahed,Mehdi Derradji,Abdeldjalil Zegaoui,Ruizhi Wu,Bingcheng Li
In this study, novel fiber-metal laminates (Al-LiFMLs) were manufactured by the lay-up process using the basalt fibers/phthalonitrile (BFs/PN) composite and the Al-Li alloy. Their mechanical and gamma rays (γ-rays) shielding properties were tested and analyzed then compared to the monolithic alloy. The results indicated that the variation in the number of composite (BFs/PN) plies significantly affected the tensile and shielding properties. The mechanical properties of the Al-LiFMLs showed improvements over the properties of both the individual neat Al-Li alloys and BFs/PN composite materials. For instance, when the number of composite layers varied from 1 to 8, the ultimate tensile strength of the Al-LiFMLs increased from 216 to 483 MPa. It was found that the failure strain displayed a more ductile behavior up to about 20% for all the developed Al-LiFMLs influenced by the ductile fracture mode of the Al-Li alloy. These enhancements were due to the good combination of the composite’s high strength and the metal’s superior ductility as well as the excellent adhesion achieved between the Al-LiFMLs constituents. Moreover, the Al-LiFMLs also revealed an effective gamma rays shielding with screening ratios ranging from 25 to 43% depending on the number of composite plies .
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危险品化学品经营许可证（带存储）