IONICS
·
2019
·Vol. 26
·期 1
·323-335
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IF 2.289
Liao Junbin,Gao Xing,Chen Quan,Yu Xinyan,Yang Shanshan,Ruan Huimin,Li Jun,Shen Jiangnan,Gao Congjie
A series of amphoteric semi-interpenetrating polymer network ion-exchange membranes (AsIPN IEMs), composed of fluoro-methyl sulfonated poly(arylene ether ketone) (SPAEK) copolymer and in situ polymerized sulfobetaine acrylamide (SBMA), has been fabricated. In this work, the SPAEK serving as a linear polymer chain is expected to guarantee the ion conductivity and mechanical and dimensional stability, while polymerized SBMA with ion pairs can moderately narrow the ion channel reducing the anion transportation in AsIPN matrix via ionic cross-linkings. In particular, the thermogravimetric analysis demonstrates the presence of ionic cross-linking in AsIPN- X IEM matrix due to the degradation temperature of sulfonated groups shifting from ca. 350 to ca. 340 °C. In applications, electrodialysis (ED) with AsIPN-10 IEM shows the highest NaCl removal ratio of 89.6% within 110 min, outperforming 60 SPAEK (83.5%) commercial CEM-Type-II (86.1%). These demonstrate AsIPN-10 IEM has the potential in rendering ED of improved performance for separation application.
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Catalysts
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2019
·Vol. 9
·期 8
·644
·
IF 3.444
Jian Wang,Xian Zhou,Michael Gatheru Waigi,Fredrick Owino Gudda,Pengfei Cheng,Wanting Ling
The presence of estrogens and antibiotics in animal manure has raised considerable attention regarding their potential risks in both the soil system and human health. This study investigated the removal of estrogens (estriol (E3), bisphenol A (BPA), estradiol (17β-E2), ethinyl estradiol (EE2)), and antibiotic (sulfadimethoxine (SDM)) in livestock manure using the Fenton oxidation process. Based on the removal efficiency of estrogens and antibiotics, the optimal conditions of the Fenton oxidation process were as follows: an H2O2dosage of 10.5 mmol/g slurry, an Fe2+/H2O2molar ratio of 0.067 mol/mol, a stirring rate of 100 rpm, the feeding of an identical amount of H2O2in two steps (at 0 and 15 min), a manure/reactor ratio of 1:25, and a reaction time of 100 min. Under these conditions, the removal efficiencies of E3, BPA, 17β-E2, EE2, and SDM in cow manure were 72.1%, 88.2%, 89.4%, 73.3%, and 99.7%, respectively. In the above-mentioned optimal conditions, the simultaneous removal of estrogens and antibiotic in different manure conditions led to the removal of above 70% of targeted contaminants, except for E3 in swine and chicken manure in all the manure. The findings demonstrate the useful application of the Fenton oxidation process in the concomitant removal of antibiotics and estrogens from animal manure, which reduces the associated risks to human health and environmental safety.Keywords:antibiotic;estrogen;livestock manure;Fenton oxidation technique
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2019
·
IF 2.752
Yan Zheng,Xun Hu,Changming Wu,Mingxu Chen,Qifeng Chen,Yi Wang,Song Hu,Jun Xiang,Qing Liu,Xiao Zhang,Ping Yang
Preparation of BiOCl with excellent photocatalytic performance via a simple and controllable method is significant for the environmental protection. In this study, microspheric BiOCl with outstanding photocatalytic performance was fabricated through a binary solvent-mediated strategy. The morphologies and phases of samples were controlled by regulating the ratio of ethylene glycol (EG) and N, N-dimethylformamide (DMF). As the ratio of EG/DMF decreased, the phases of samples transformed from BiOCl to Bi/BiOCl and the size of the samples become larger. Through exploring the growth mechanism of the synthesized samples, the viscosity of binary solvent was found to be effective in the growth process. When the ratio of EG/DMF was 1/5, the samples exhibited the better photocatalytic performance in the degradation of Rhodamine B than the samples obtained at the single solvent and commercial TiO 2 . This superior photocatalytic performance for the samples prepared in binary solvent of EG/DMF with the ratio of 1/5 was attributed to the microsphere morphologies with appropriate size, largest specific surface areas with mesopore structure and strong adsorption ability. Furthermore, the photocatalytic mechanism in the degradation of Rhodamine B was also proposed based on the experiment of trapping active species.
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TALANTA
·
2018
·
IF 4.244
Zhenzhen Fan,Lifang Fan,Shaomin Shuang,Chuan Dong
A facile and sensitive photoelectrochemical (PEC) sensing platform based on zinc phthalocyanine (ZnPc) sensitized TiO 2 nanorodarrays (NRAs) was successfully fabricated for detection of bisphenol A (BPA). The vertically aligned TiO 2 NRAs with one-dimensional (1D) nanostructure was synthesized in-situ on fluorine-doped tin oxide-coated glass (FTO) substrate by simple one-step hydrothermal method , and then the TiO 2 NRAs/FTO surface was covered with ZnPc. 1D nanostructure of TiO 2 NRAs could provide not only more spaces for the load of ZnPc, but direct pathways to reduce the recombination of electron-hole pairs, improving the photocatalytic efficiency. The combination of ZnPc with TiO 2 NRAs extended effectively the absorption of TiO 2 to visible region and improved greatly the charge transfer ability of TiO 2 NRAs. With the addition of BPA, BPA was oxidized by photogenerated holes during PEC reaction so that the photocurrent of the PEC sensing platform increased. BPA could be quantified by measuring the photocurrent change. The developed PEC sensor exhibited outstanding analytical performance with high sensitivity, excellent stability and good reproducibility. A wide linear work range from 0.047 to 52.1 μM was obtained with a low detection limit of 8.6 nM. Meanwhile, the sensor was also used to evaluate the level of BPA in plastic products and food.
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CHEMOSPHERE
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2018
·
IF 4.427
Shanshan Yang,Pingxiao Wu,Quanyun Ye,Wen Li,Meiqing Chen,Nengwu Zhu
Novel Fe 0 -vermiculite (Fe-Ver-C-H 2 ) composite was synthesized by thermal reduction and acted as catalysts to remove bisphenol A (BPA) in photo-Fenton system. In term of activation ability toward H 2 O 2 , separation ability and stability, Fe-Ver-C-H 2 presented obvious advantages over other kinds of Fe 0 -vermiculite composite (Fe-Ver-NaBH 4 ), which obtained by traditional liquid reduction. The reason was that iron oxide shells on the surface of Fe 0 were α-Fe 2 O 3 and Fe 3 O 4 for Fe-Ver-NaBH 4 and Fe-Ver-C-H 2 , respectively. And for Fe-Ver-C-H 2 , the synergistic effect between iron core (Fe 0 ) and iron oxide shell (Fe 3 O 4 ) is beneficial to catalytic performance. The mechanism and plausible pathway of BPA degradation were also proposed according to the results of radical scavenger studies and gas chromatography-mass spectrometry (GC-MS), respectively. In addition, factorial effects for Fe-Ver-C-H 2 in photo-Fenton system were also investigated and optimized as: pH of 5, dosage of 0.2 g L −1 and H 2 O 2 concentration of 20 mM. This study presented a facile method to synthesize novel Fe 0 -vermiculite composite and provided a new sight to investigate the effect of iron oxide shell on the catalytic performance when Fe 0 -vermiculite composite acted as catalyst to remove contaminants from the environment in photo-Fenton system.
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JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Yanlong Chen,Wenfen Zhang,Yanhao Zhang,Zhifen Deng,Wenjie Zhao,Huifang Du,Xue Ma,Dan Yin,Fuwei Xie,Yu Chen,Shusheng Zhang
This study reports a novel strategy for the preparation of porous aromatic framework (PAF-6) coated magnetic nanoparticles (PAF-6 MNPs) using cyanuric chloride as a planar trigonal basis upon which to build a linear piperazine linker unit. The PAF-6 MNPs were examined as an efficient solid-phase extraction (SPE) sorbent for enrichment of trace organic pollutants including phenol, 2,4,6-trinitrophenol, naphthalene, naphthol, bisphenol A, 2,4-dichlorophenol and 3-nitrochlorobenzene in water. The high-performance liquid chromatography detection limits of such analytes were in the range of 0.08–5.02 ng/mL and recoveries were found to be 84.0–94.0% in well water, tap water, river water and wastewater. The main toxic components of cigarette smoke, including phenolic compounds and benzo[a]pyrene, are efficiently adsorbed by PAF-6 MNPs, and over 50% of such toxins are removed. Theoretical computations were performed to understand the molecular interaction mechanism between PAF-6 and such analytes. The results demonstrate that the PAF-6 MNPs sorbents show excellent adsorption of phenols, polycyclic aromatic hydrocarbons and nitroaromatics based on multiple π-π stacking and hydrogen-bond interactions. These results suggest that the PAF-6 MNPs can be applied to extraction, removal and determination of diverse trace multi-target analytes from complex media.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 19
·8978-8985
·
IF 9.931
Bao-Cheng Huang,Jun Jiang,Gui-Xiang Huang,Han-Qing Yu
The persulfate-based advanced oxidation process is a promising technology for water treatment, while its effectiveness depends mainly on the activation efficiency of catalysts and the oxidant yield derived from persulfate. Thus, exploration of efficient and cost-effective activators for persulfate decomposition is highly desired. In this work, biochar, which was synthesized via a facile one-pot pyrolysis of sewage sludge, was proven to be an efficient persulfate activator for pollutant degradation. For a representative endocrine disrupting pollutant, bisphenol A, an average removal rate of 3.21 mol BPA per mol oxidant per h could be achieved by peroxymonosulfate in a wide pH range of 4.0–10.0 at a biochar dosage of 0.2 g L−1. Also, a high mineralization efficiency of ∼80% (total organic carbon removal) was obtained within 30 min. A further catalytic mechanism study demonstrated that singlet oxygen, which was catalytically produced by the ketone structure inside the biochar, was the main reactive species responsible for bisphenol A degradation. More importantly, metals in the sludge precursor were found to play an important role in the active site formation during the pyrolysis of raw sludge. This work not only provides a novel value-added reuse approach for sewage sludge as an efficient persulfate activator but also would be beneficial for further designing and fabricating carbon-based persulfate catalysts.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Suqian Xu,Hanxu Zhu,Wenrui Cao,Zhibin Wen,Jinnan Wang,Corvini Philippe François-Xavier,Thomas Wintgens
Cu-Al 2 O 3 -g-C 3 N 4 and Cu-Al 2 O 3 -C-dots were synthesized for the first time to enhance the catalytic activity and utilization of H 2 O 2 . SEM, TEM, XPS, FT-IR, XRD, TPR and solid-state EPR were used to characterize the catalysts. In the Cu-Al 2 O 3 -g-C 3 N 4 system, the electron-rich centre of Cu and electron-deficient site of Al were formed due to the higher electronegativity of Cu. Moreover, Cu ions could coordinate with the hydroxyl on the tri-s-triazine ring of g-C 3 N 4 or the graphene conjugated π-domains of C-dots via the Cu O C linkage so that the orbital interactions involving electron transport from π → Cu also induced the formation of an electron-rich Cu centre and an electron-deficient π-electron conjugated system, resulting in the strengthening of the dual-reaction centres. This mechanism was validated by Roman, EPR and XPS spectra. In addition, EPR experiments demonstrated that two electron-transfer processes formed OH in the presence of H 2 O 2 . The first electron transfer was from the electron-rich Cu centres to H 2 O 2 , and the other was from H 2 O to the electron-deficient site. Thus, more OH were generated and high H 2 O 2 utilization was achieved in the Cu-Al 2 O 3 -g-C 3 N 4 and Cu-Al 2 O 3 -C-dots suspension. Furthermore, the turnover frequency (TOF) for the Cu-Al 2 O 3 -C-dots and Cu-Al 2 O 3 -g-C 3 N 4 dispersions were determined and were found to be much higher than those of the classic homogeneous Fenton reaction. Thus, Cu-Al 2 O 3 -g-C 3 N 4 and Cu-Al 2 O 3 -C-dots showed high activity and stability for the catalytic degradation of organic pollutants under mild conditions.
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FOOD CHEMISTRY
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2018
·
IF 4.946
Dezhi Yang,Guixiang Li,Lan Wu,Yaling Yang
A novel liquid-phase microextraction based on the ferrofluid was successfully applied for the extraction and determination of four phenolic compounds (bisphenol-A, bisphenol-AF, tetrabromobisphenol-A and 4-tert-octylphenol) in milks and fruit juices. In this study, a range of alkyl (C 4 –C 10 ) alcohols as the carrier liquid were used for the preparation of ferrofluids. The study showed that an appropriate chain length of alkyl alcohol may improve the extraction efficiency and maintain the integrity of ferrofluids during extraction, so 1-heptanol (C 7 ) was selected as the optimal carrier liquid. Specifically, the effects of various parameters on the extraction of phenolic compounds were investigated and optimized. Under the optimized conditions, the limits of detection were between 0.35 and 0.66 μg L −1 . The intra-day and inter-day precision (RSD %) for the analytes at 10 and 50 μg L −1 were in the range of 3.2–6.7 % and 2.9–7.1%, respectively.
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MICROCHEMICAL JOURNAL
·
2018
·
IF 2.746
Jingjing Zhang,Yu Chen,Wenying Wu,Zhipeng Wang,Yanjie Chu,Xiaohui Chen
In this study, a highly selective and binding hollow porous dummy molecularly imprinted polymer (HPDMIP) was prepared for the separation and determination of bisphenols (BPs) in plastic products using bisphenol AF (BPAF) as dummy template, 4-vinylpyridine as the functional monomer , and MCM-48 as sacrificial support. HPDMIP was characterized by FT-IR spectroscopy, scanning electron microscope, nitrogen adsorption experiment and thermo-gravimetric analysis. Adsorption and selectivity experiments revealed that HPDMIP had a superior adsorption capacity and fast binding kinetics for recognizing BPs. Therefore, a perfect method using HPDMIP as a sorbent material for solid-phase extraction (SPE) was developed, which achieved specific adsorption and enrichment of trace BPs in complex samples. In addition, accelerated solvent extraction (ASE) along with SPE were used as pretreatment method for extracting and concentrating the BPs, and the BPs were determined based on UHPLC–MS/MS. The conditions of ASE and SPE were thoroughly investigated and optimized. Meanwhile, in the ASE proceeding, a Box-Behnken design was applied. Under the optimal conditions, each target analyte had a good linearity between 0.1 and 50 μg·L −1 with regression coefficients in the range of 0.9967–0.9995. Limits of detection and quantification varied from 0.02 to 0.6 μg·L −1 and 0.05 to 2 μg·L −1 , respectively. The spiking recoveries between 50.8 and 138.31% for samples spiked at different concentration levels were achieved. The developed method eliminated the effect of template leakage on quantitative analysis and could be applied to extraction and analysis of BPs in different samples with satisfactory results, which provided a useful tool for further studying the BPs in complex samples.
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JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Guibin Li,Xin Chen,Lixiao Miao,Jitao Chen,Junrong Zheng
Most Li-metal batteries can work safely only under 45 °C and have risks of burning or explosion. A novel nonflammable Li-battery is developed to address the challenge, using an interpenetrating rigid-flexible poly (aryl-ether-ketone) nonwovens (PAEKNW) cross-linked with poly(ethylene glycol) dimethacrylate electrolyte to transport lithium ions . The hybridized polymer electrolyte possesses a high ionic conductivity of 1.2 × 10 −3 S cm −1 at room temperature and a wide electrochemical window with decomposition voltage higher than 4.5V. It does not readily catch fire or shrink, even under open flame, and shows no noticeable volumetric expansion or contraction at 80 °C, in stark contrast to most liquid-electrolytes-based or gel batteries. Even after cut off by one-third, the battery continues to function. The unique bi-functional molecular design of the polymer electrolyte, which guarantees simultaneously a very rare combination of thermal and mechanical stability, high ion conductivity, and a wide electrochemical window at room temperature, is the key factor responsible for the excellent comprehensive performances.
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HIGH PERFORMANCE POLYMERS
·
2018
·
IF 1.047
Zhi Shao,Chengji Zhao
A series of side-chain-type sulfonated poly(arylene ether ketone)s with high ion exchange capacity (IEC) values were prepared by polycondensation reaction of 4,4′-difluorobenzophenone with 2,2′-bis(3-amino-4-hydroxyphenyl) and bisphenol A, followed by post-grafting reaction using 1,4-butanesultone. For these obtained membranes, sulfoalkylamine functionalized poly(ether ether ketone) (SAm-PEEK)-0.8 with the highest IEC of 3.42 mequiv. g−1 displayed the highest proton conductivity of 0.11 S cm−1 at 25°C and 0.167 S cm−1 at 60°C, respectively. The morphology of these membranes was investigated by transmission electron microscope analysis. The result showed that these membranes exhibited well-connected hydrophilic channels due to their high IEC values and densely populated flexible acid side chains. Owing to their low methanol permeability and high selectivity, SAm-PEEK-x membranes are promising candidates for direct methanol fuel cell applications.
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