POLYMER COMPOSITES
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2019
·Vol. 41
·期 1
·134-141
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IF 2.268
Mehdi Derradji,Abdeldjalil Zegaoui,Aboubakr Medjahed,Wenbin Liu,Abdelkhalek Henniche
Phthalonitrile resins as one of the leading high performance polymers are currently used in highly exigent applications. Herein, aiming to achieve the best combination of mechanical, thermal, and nuclear shielding performances, we prepared hybrid materials based on the typical phthalonitrile resin and the silane surface modified chopped carbon fibers and tungsten carbide nanoparticles. The obtained results suggested that a synergistic combination between the three constituent was clearly achieved leading to excellent mechanical and gamma rays shielding properties. For instance, the tensile and bending strengths reached up to 505 and 584 MPa for the composite containing 20 and 30 wt% of carbon fibers and tungsten carbide nanoparticles, respectively. Similarly, the gamma rays screening ratio also reached the exceptional value of 39% for the same 2 cm thick hybrid. Finally, the as such described hybrid materials proved that a multi-approach strategy is often the best solution to achieve the requirements of highly exigent applications.
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Catalysts
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2019
·Vol. 9
·期 8
·644
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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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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Haichao Fu,Peng Zhao,Shengjun Xu,Gong Cheng,Zhuoqian Li,Yi Li,Kai Li,Shuanglong Ma
The novel Fe 3 O 4 and porous biochar originated from Myriophyllum aquaticum composites (Fe 3 O 4 /MC) with graphitized structure, hierarchical porous and strong magnetism were used as efficient catalysts for degradation of organic pollutants in the presence of peroxymonosulfate (PMS). Three types of catalysts pyrolyzed at 600, 700, 800 °C manifested quit different PMS activation effect with the much better p-hydroxybenzoic acid (HBA) degradation efficiency at 700 and 800 °C than that of 600 °C, which was assigned to the high graphitization degree and mesopores ration of catalysts pyrolyzed at higher temperature. Based on radicals quenching experiments and electron paramagnetic resonance (EPR) analyses, the radical pathway dominated by surface-bound SO 4 − was the prevailing way while the non-radical pathway performed as electro-transfer was the recessive way during the degradation process. The large amount of surface-bound SO 4 − radicals were produced through the reduction of PMS by Fe(II), which was regenerated by participation of O 2 − /O 2 . The non-radical pathway was achieved by the graphitized structure which acted as electron transfer bridges accepting electrons form organic pollutants and denoting electrons to PMS. Six HBA intermediates were detected and the possible HBA degradation pathway was proposed tentatively. Consequently, the conversion of Myriophyllum aquaticum to composite catalyst provides a brand-new idea for efficient utilization of waste biomass in a high value-added way and simultaneously achieving the contaminants elimination.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2019
·
IF 4.527
Dezhi Yang,Yingdong Wang,Jianbo Peng,Chun Xun,Yaling Yang
A simple, effective and convenient method for determination of phenolic compounds by acid-base induced deep eutectic solvents (DESs) microextraction was developed. The binary and ternary DESs were prepared by a range of fatty acids (C 8 -C 12 ), which can act as hydrogen bond donors and hydrogen bond acceptors simultaneously. The gas-assisted mixing customization provides excellent mixing performance and concentration efficiency through the bubble adsorption mechanism for the handling of large-volume aqueous sample. In extraction process, NH 3 ·H 2 O can act as the emulsifier agent and reacted with DESs to form salts with a cloudy solution, which can obviously improve the extraction efficiency. HCl can act as the phase separation agent, and there is no need to centrifuge, which increases the efficiency of analysis procedure. The factors affected on extraction efficiency were carefully optimized. At optimum conditions and molar ratio of C 8 :C 9 :C 12 (3:2:1), the limit of detections (LODs), the preconcentration factor, the repeatability (RSDs%) were in the range of 0.22–0.53 μg L −1 , 235–244, and 2.6–6.7%, respectively. Finally, the proposed method was applied to analyze four phenolic compounds in real water samples and the recoveries were between 87.4% and 106.6%.
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ACS Applied Nano Materials
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2019
·
IF 0
Zong-Da Du,Yuan-Yuan Cui,Cheng-Xiong Yang,Xiu-Ping Yan
Development of functional porous materials for efficient elimination of environmental pollutants is of great importance in green chemistry and environmental protection. Here we report the design, synthesis, and application of a core–shell magnetic amino-functionalized microporous organic network nanosphere (Fe3O4@MON-NH2) for efficient magnetic adsorption of a typical brominated flame-retardant tetrabromobisphenol A (TBBPA) from aqueous solution. By integration of the hydrophobic networks and hydrogen binding sites within MON-NH2, the synthesized core–shell Fe3O4@MON-NH2 nanospheres gave good adsorption for TBBPA. The adsorption equilibrium of TBBPA (50 mg L–1) on Fe3O4@MON-NH2 was achieved within 1 min, showing ultrafast adsorption kinetics of Fe3O4@MON-NH2 for TBBPA. The adsorption of TBBPA on Fe3O4@MON-NH2 followed the pseudo-second-order kinetics and Langmuir adsorption models, giving a maximum adsorption capacity of 135.9 mg g–1 at 25 °C. The adsorption of TBBPA on Fe3O4@MON-NH2 was a spontaneous and endothermic process controlled by positive entropy. Encouraged by the large adsorption capacity, rapid adsorption kinetics, and the small effect of pH (5–10), dissolved organic matter, and ionic strength on the adsorption, the application of Fe3O4@MON-NH2 for TBBPA removal in real water samples was achieved. The used Fe3O4@MON-NH2 can be easily regenerated and reused at least four times without significant reduction of the adsorption capacity. These results revealed the potential of Fe3O4@MON-NH2 for adsorption and removal of environmental pollutants from aqueous solution.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2019
·
IF 4.527
Cong Yuan,Lihong Wang,Long Zhu,Benhui Ran,Xue Xue,Zaizhao Wang
Ubiquitous BPA exposure resulted in DNA methylation errors and oxidative stress . Numerous studies have demonstrated that oxidative stress can lead to changes in DNA methylation levels and supplementation with antioxidants, including N-acetylcysteine (NAC), was able to restore these changes. Our previous study supposed that BPA-induced de novo synthesis of glutathione (GSH) promoted DNA methylation process in Gobiocypris rarus testes . To validate this conjecture and explore the protective effects of NAC on BPA toxicity, the present study was carried out. Adult male G. rarus was treated with 225 μg L −1 BPA and/or NAC for 7 days. The sperm motility and DNA integrity of G. rarus were determined. Meanwhile, the levels of 5-methylcytosine (5mC), GSH, hydrogen peroxide (H 2 O 2 ), DNA methyltransferase proteins (DNMTs), γ-glutamyl cysteine synthetase (GCS), S-adenosylmethionine (SAM), S-adenosylhomocysteine (SAH), homocysteine (HCY), nicotinamide adenine dinucleotide phosphate (NADPH) and cysteine in the testes were detected. Furthermore, the activities of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) were measured. Results indicated that NAC addition resulted in increase of cysteine contents and partially inhibited the BPA-induced DNA hypermethylation of G. rarus testes. In addition, the changes in DNA methylation levels in the testes after BPA and/or NAC treatment might be controlled by DNA methylation process that mediated by DNMTs. Moreover, BPA exposure caused oxidative stress in the testes and the elimination of H 2 O 2 might be mainly accomplished by CAT while it changed to mainly through GPx after NAC supplement. Finally, the positive response of testicular antioxidant enzyme system and the antioxidant activity of NAC itself protected sperm motility and DNA integrity from oxidative damage in each group.
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NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 8
·3400-3408
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IF 3.069
Yafei Wang,Mengjie Tian,Kai Yu,Leyan Li,Zulei Zhang,Lei Li
Novel magnetic dummy molecularly imprinted mesoporous silica particles (m-DMIMSP) were prepared using a hybrid dummy imprinting approach combined with magnetic nanoparticles to obtain a magnetic material highly selective towards bisphenol A (BPA). The structure and morphology of synthesized m-DMIMSP were characterized by transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, vibrating sample magnetometry, X-ray diffraction and N2 sorption analysis. The results showed that m-DMIMSP exhibited a mesoporous structure and favorable magnetic properties with saturation magnetization of 4.87 emu g−1. More importantly, m-DMIMSP displayed fast binding kinetics, high rebinding capacity of 76.8 mg g−1, excellent imprint factor of 4.9 and extremely high selectivity towards BPA over 4,4′-biphenol, diethylstilbestrol and hydroquinone, with selectivity coefficients all above 3.80. Moreover, the adsorptive capacity of m-DMIMSP was 2.0, 4.6 and 4.9 times higher than those of controlled magnetic molecularly imprinted mesoporous silica particles, magnetic dummy non-imprinted mesoporous silica particles and magnetic non-imprinted mesoporous silica particles, respectively, thus indicating the superiority of dummy molecular imprinting. Theoretical analysis showed that the experimental data fitted well to the pseudo-second-order model and Langmuir adsorption isotherm, indicating that chemical adsorption might be the rate-limiting step. Furthermore, the high adsorptive capacity and selectivity of m-DMIMSP remained almost constant after 8 runs. Finally, water samples were successfully analyzed with m-DMIMSP and high recoveries in the range of 95.6–106.2% were obtained. Overall, these results demonstrate that m-DMIMSP possesses great potentials for rapid and highly effective extraction of BPA from water samples.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
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IF 2.931
Xianmei Piao,Zhongrui Liu,Yangyang Li,Dahong Yao,Liwen Sun,Baihui Wang,Yan Ma,Libo Wang,Yan Zhang
Bisphenol A (BPA) as a chemical raw material, is widely used in the manufacturing process of daily necessities. It was reported that BPA could induce oxidative stress , and catalase (CAT) can protect the body from oxidative stress. In this paper, the effect of BPA on CAT was carried out in vitro and in vivo. Firstly, we studied the effects of BPA on oxidative stress, cell viability and CAT activity in human hepatocytes, and the results of vitro experiments show that the survival rate of hepatocytes significant decreased along with the increase of BPA concentration. And when the BPA concentration was 100 μM, the hepatocyte survival decreased by 13.2%, ROS levels in the cells increased by 85%. However, the activity of intracellular CAT increased with the increasing concentration of BPA in 24 h. The results of vivo experiments showed that the activity of CAT in the high-dose group decreased by 29.1% compared with the control group. The long-term effects of BPA on rats reduced the CAT activity in liver, which reduced the resistance to oxidative stress. Meanwhile, the interaction mechanism between BPA and CAT at the molecule level was performed via multiple spectra methods and molecular docking, and the results illustrated that the structural change of CAT is mainly due to the strong combination of BPA with the residues of Trp185. In addition, the interaction mechanism between BPA and CAT were hydrophobic and electrostatic effect. This study provided experimental evidence for better understanding the toxicity of BPA.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2019
·Vol. 35
·期 3
·440-448
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IF 1.071
Lyu Cong,Li Yicheng,Fang Chen,Feng Wei,Sun Wentian,Zhang Qihui
Peroxymonosulfate(PMS) has received increasing attention as viable technology for recalcitrant organics removal from polluted waters. Although promising, alternative heterogeneous catalysts with stable structure, strong hydrophilicity, environmental friendliness and excellent catalytic performance are highly desirable to facilitate the wide industrialization of PMS. In this work, Ni doped CoOOH catalyst was employed as PMS activator. Ni dopant had a significant influence on the morphology, structure and catalytic performance of CoOOH, Ni 0.2 Co 0.8 OOH exhibited the best catalytic performance. Reaction rate of Ni 0.2 Co 0.8 OOH was 2, 4, and 4.4 times that of CoOOH, CoFe 2 O 4 and Co 3 O 4 , respectively. Moreover, Ni 0.2 Co 0.8 OOH/PMS system had potential application to organic pollutants and displayed a great catalytic activity over a broader pH value( e.g. , 4–10). More importantly, Ni doping accelerated the transformation of Co(III) and Co(II) and formed active species CoOH + and NiOH + , which were responsible to the enhancement of PMS activation. • OH, \(\overline G \) and 1 O 2 were detected, indicating both non-radical and radical processes in the Ni 0.2 Co 0.8 OOH/PMS system. These findings provide a promising alternative to mixed-metal oxyhydroxides catalysts for PMS activation, demonstrating a great potential in environmental remediation and wastewater treatment.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Zhiqun Xie,Jiali Zhou,Jinnan Wang,Corvini Philippe François-Xavier,Thomas Wintgens
Novel Fenton-like catalyst γ-Cu-Al 2 O 3 -Bi 12 O 15 Cl 6 with electron-poor Cu centre and electron-rich Bi centre was synthesized for selective degradation of phenolic compounds. Different from electron-rich Cu centre catalysts, the electron-poor Cu centre, which was induced by high electronegativity of Bi, could facilitate the formation of σ-Cu-ligand with phenolic compounds. On one hand, H 2 O 2 could directly oxidize σ-Cu-ligand to HO-adduct radicals with the generation of OH. Meanwhile, Cu(II) in the σ-Cu(II) complexes could be reduced to Cu(I) by oxidization of the HO-adduct radicals to hydroxylation products. Such reaction not only prevented Cu(II) from oxidizing H 2 O 2 to HO 2 /O 2 − but also enhanced the redox cycle of Cu(II)/Cu(I), which improved the catalytic activity and H 2 O 2 utilization. On the other hand, although the σ-Cu-ligand was gradually decreased with the decrease of phenolic compounds, dual-reaction centre played the dominant role in catalytic reaction . In addition, large amounts of oxygen vacancies (OVs) are formed in Bi 12 O 15 Cl 6 during the calcining process (BiOCl→Bi 12 O 15 Cl 6 ) , which can also increase the generation of OH. Thus, both electron-rich Bi center and OVs could still reduce H 2 O 2 to · OH for organics degradation even without the formation of σ-Cu-ligand. Being attributed to the synergistic effect of σ-Cu-ligand, dual-reaction centre and OVs mentioned above, γ-Cu-Al 2 O 3 -Bi 12 O 15 Cl 6 achieved high catalytic activity for phenolic compounds degradation and utilization efficiency of H 2 O 2 (η). In addition, various analytic methods (XPS, TPR, FT-IR, Raman, EPR and solid-state EPR) were used to prove the synergistic effect of the electron-poor/rich centre, σ-Cu-ligand and OVs of catalyst.
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JOURNAL OF CHROMATOGRAPHY A
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2019
·
IF 3.858
Xiaolan Wang,Xufeng Meng,Qiuhua Wu,Chun Wang,Zhi Wang
A solid phase extraction (SPE) method with a porous organic polymer as adsorbent was established for the extraction of five carbamate pesticides (metolcarb, carbaryl, isoprocarb, bassa and diethofencarb) from milk, white wine and juice samples prior to high performance liquid chromatography-diode array detection. The main factors affecting the SPE were optimized, including sample volume, sample loading rate, sample solution pH, desorption conditions and cartridge reusability. Under the optimal conditions, a good linearity existed in the range from 1.0 to 320.0 ng mL −1 for milk and white wine samples and from 0.5 to 160.0 ng mL −1 for juice sample with the correlation coefficients between 0.9956 and 0.9998. The method recoveries of the carbamates were 82.0%–110.0%. The limits of detection were 0.12-0.40 ng mL -1 for milk and white wine samples, and 0.06-0.20 ng mL −1 for juice sample. The adsorption mechanism of the adsorbent was investigated by the extraction of different types of organic compounds (carbamates, benzoylurea insecticides, endocrine disrupting chemicals and polycyclic aromatic hydrocarbons) with the adsorbent. The results showed that the existence of the hydrogen-bonding between the adsorbent and the analytes is favorable for the adsorption and strong hydrophobicity seems to have an adverse effect.
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危险品化学品经营许可证（带存储）