SCIENCE OF THE TOTAL ENVIRONMENT
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2020
·
IF 6.551
Huan Wu,Yuexin Wei,Yu Zhou,Chunlan Long,Yifan Hong,Yan Fu,Tianxin Zhao,Junke Wang,Yuhao Wu,Shengde Wu,Lianju Shen,Guanghui Wei
Bisphenol S (BPS) is now used as an alternative of bisphenol A (BPA), but has been implicated in male reproductive dysfunction—including diminished sperm number and quality and altered hormonal concentrations. However, the mechanisms of action subserving these effects remains unclear. In the present study, BPS at doses of 50 mg/kg bw and 100 mg/kg bw caused defects in the integrity of the blood-testis barrier (BTB) and apical ectoplasmic specialization (ES), and we also delineated an underlying molecular mechanism of action. BPS induced F-actin and α-tubulin disorganization in seminiferous tubules, which in turn led to the truncation of actin filaments and microtubules. Additionally, BPS was found to perturb the expression of the actin-binding proteins Arp3 and Eps8, which are critical for the organization of the actin filaments. mTORC1 and mTORC2 manifest opposing roles in Sertoli cell junctional function, and we demonstrated that mTORC1/rpS6/Akt/MMP9 signaling was increased and that mTORC2/rictor activity was also attenuated. In summary, we showed that BPS-induced disruption of the BTB and apical ES perturbed normal spermatogenic function that was mediated by mTORC1 and mTORC2. The imbalance in mTORC1 and mTORC2, in turn, altered the expression of actin-binding proteins, resulting in the impairment of F-actin and MT organization, and inhibited the expression of junctional proteins at the BTB and apical ES.
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Polymers
·
2020
·Vol. 13
·期 1
·72
·
IF 3.426
Xin Tong,Zhao Wang,Mei-Ling Zhang,Xiao-Jun Wang,Gang Zhang,Sheng-Ru Long,Jie Yang
A series of novel thermoplastic elastomers based on (poly(decamethylene terephthalamide/decamethylene isophthalamide), PA10T/10I) and poly(ethylene glycol) (PEG) were synthesized via a facile one-pot, efficient and pollution-free method. The thermal analysis demonstrates that the melting points of the resultant elastomers were in the range of 217.1–233.9 °C, and their initial decomposition temperatures were in the range of 385.3–387.5 °C. That is higher than most commercial polyamide-based thermoplastic elastomers. The tensile strength of the resultant elastomers ranges from 21.9 to 41.1 MPa. According to the high-temperature bending test results, the resultant samples still maintain considerably better mechanical properties than commercial products such as Pebax®5533 (Arkema, Paris, France), and these novel thermoplastic elastomers could potentially be applied in high-temperature scenes. The non-isothermal crystallization kinetics of the resultant elastomers and PA10T/10I was investigated by means of Jeziorny and Mo’s methods. Both of them could successfully describe the crystallization behavior of the resultant elastomers. Additionally, the activation energy of non-isothermal crystallization was calculated by the Kissinger method and the Friedman equation. The results indicate that the crystallization rates follow the order of TPAE-2000 > TPAE-1500 > PA10T/10I > TPAE-1000. From the crystallization analysis, the crystallization kinetics and activation energies are deeply affected by the molecular weight of hard segment.Keywords:thermoplastic elastomer;non-isothermal crystallization kinetics;semi-aromatic polyamide
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Yongkui Li,Xianjin Qi,Guohua Li,Hua Wang
Nonferrous smelting wastewaters containing high levels of arsenic and sulfuric acid threaten human health and ecological environments due to insufficient disposal technologies and/or possible leakages during transportation to long-term storage facilities. Chemical precipitation is one important route for arsenic removal and immobilization via the formation of arsenic-stabilized minerals. In this study, we propose a new strategy for the treatment of wastewaters containing high levels of arsenic using pyrite as an in situ S and Fe source to prepare environmentally friendly scorodite and As 2 S 3 precipitates. Dissolved pyrite release (S-II) and Fe (II) ions in highly acidic wastewater, both of which drive arsenic precipitation. Sulfide ions readily react with As(III) to generate the stable As 2 S 3 while Fe(II)/As(III) were oxidized to Fe(III)/As(V) by H 2 O 2 . The reaction between Fe(III) and As(V) took place on the pyrite surface as a nucleation site to form amorphous ferric arsenate that ultimately transformed into crystalline scorodite. Sulfide ions were oxidized to H 2 SO 4 that further promoted pyrite dissolution. Up to 99.4% of arsenic was successfully removed from copper smelting wastewaters with an initial arsenic concentration of 11200 mg/L. The concentration of leached As from the As-bearing precipitate was 1.78 mg/L under optimized conditions, which were: a 1.4 FeS 2 /As molar ratio, an initial solution pH of 2, an H 2 O 2 /As molar ratio of 1%, a reaction temperature of 90 °C, and a reaction time of 12 h. In summary, a prospective process successfully shows arsenic removal and immobilization from smelting wastewater, and further demonstrates the potential for the efficient and affordable disposal of wastewater.
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POLYMER
·
2020
·
IF 4.231
Ke Wang,Qi Liu,Guiyan Liu,Yongfei Zeng
The study of thermoresponsive homopolymers has attracted great attention due to their broad application value. Herein, a series of novel thermoresponsive homopolymers of poly[oligo(ethylene glycol) (acyloxy) methacrylate]s containing oligo(ethylene glycol) (OEG) units and substituent groups of ester have been designed and prepared by RAFT polymerization . The solution properties of these polymers have been investigated in detail, which indicate that most of them exhibit lower critical solution temperature (LCST) in water and upper critical solution temperature (UCST) in alcohols, and their LCST-type or UCST-type cloud point temperature ( T CP L or T CP U ) is closely related to the OEG units and ester groups. Furthermore, the parameters affecting the thermoresponse of these polymers including polymerization degree (DP) and concentration have also been investigated. The present work not only discovers a series of novel thermoresponsive polymers, but also has certain guiding significance on the understanding of molecular structure and thermoresponsive property relationships, which is useful for the design of new thermosensitive polymers.
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POLYMER DEGRADATION AND STABILITY
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2020
·
IF 4.032
Guoqiang Wang,Meichao Hou,Min Jiang,Rui Wang,Yin Liang,Guangyuan Zhou
A series of poly (propylene naphthalate-co-propylene 2,5-furandicarboxylate)s (PPNFs) were synthesized by the melt polycondensation method from 2,5-furandicarboxylic acid (FDCA), 2,6-naphthalenedicarboxylic acid (2,6-NDCA) and 1,3-propanediol (1,3-PDO). Their composition and sequence distribution were analyzed by 1 H NMR and 13 C NMR. Crystallization behaviors , thermal and mechanical properties were investigated. The weight-average molecular weights of PPN, PPF and PPNFs were higher than 28 000 g mol −1 and the polydispersity index was between 2.1 and 2.7. DSC and XRD results show that poly (propylene 2,5-furandicarboxylate) (PPF) and poly (propylene naphthalate) (PPN) are semi-crystalline polymers, but all PPNFs are amorphous polymers. With increasing the content of FDCA, the initial temperature of α-relaxation rose significantly. When the content of FDCA was 74 mol%, PPNF74 exhibited the high bio-based content (77.6 wt%) and good mechanical properties ( σ m = 71 MPa and ε b = 146%).
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 29
·7737-7745
·
IF 3.286
Pan Daodong,Xun Mingyue,Lan Hangzhen,Li Jianlin,Wu Zhen,Guo Yuxing
A newly developed molecularly imprinted photonic polymer (MIPP) film, which was prepared by colloidal crystal templating and surface molecular imprinting, was used for selective capture of S-layer protein (SLP) from a complex Lactobacillus acidophilus sample. The colloidal crystal templates were formed by a dipping process followed by chemical binding of the imprinted template SLP molecules. A sandwich structure consisting of two glass slides was formed after the SLP–silica layer had been covered with a poly(methyl methacrylate) glass slide. After polymerization of the SLP–silica layer with the preprepared polymerization solution, hydrofluoric acid and acetic phosphate buffer solutions removed the silica particles and SLP molecules, respectively. The MIPP film obtained exhibited a three-dimensional, highly ordered and interconnected macroporous structure (pore size greater than 200 nm), which is specifically accessible to SLP molecules. The adsorbed SLP molecules were simply and straightforwardly detected by a fiber-optic spectrometer. The redshift of the Bragg diffraction peak of the MIPP film was linearly related to the number of SLP molecules that had been harvested in the film. The detection limit of the SLP–MMIP–fiber-optic spectrometer method for SLP was 1 ng mL -1 . The MIPP sensor was successfully applied to detect SLP molecules in a crudely extracted Lactobacillus acidophilus sample. Our results prove the applicability of the SLP–MIPP film for fast and real-time measurement of SLP.
Graphical abstract
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POLYMER TESTING
·
2022
·
IF 4.931
Jiang Tu,Suhui Xie,Qianyu Zhao,Jinping Guan,Chunhong Wu,Peng Wang
Developing eco-friendly durable flame-retardant cotton fabric not only expands its application area, but also caters to the healthy and environmentally friendly concept of consumers. Herein, a reactive P/S/N-containing synergistic flame retardant (PSN) was synthesized to prepare eco-friendly durable flame-retardant cotton fabric through chemical modifying method. Flame-retardant finishing deteriorated the softness, whiteness, tensile strength and air permeability of cotton fabric. PSN conferred outstanding flame retardancy, fire safety and durability to cotton fabric. For treated fabric with the add-on of 14.2%, it achieved an LOI value of 36.5% and extinguished spontaneously even after 50 laundering cycles. Its peak heat release rate, total heat release and fire growth rate index values decreased sharply than those of the control fabric. PSN exhibited high-efficiency flame-retardant behavior, and the synergy between P, S and N elements facilitated the formation of intumescent barrier on the fiber surface during combustion. The hydrolysis of covalent bond and formation of phosphate/sulphonate during laundering both accounted for the decrease in flame retardancy of treated fabric.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Jiannan Chen,Xiuhua Xia,Peizhen Li,Hang Yu,Yunfei Xie,Yahui Guo,Weirong Yao,He Qian,Yuliang Cheng
Natural N and S co-doped carbon dots (NSCDs) were synthesized via hydrothermal synthesis using food-derived crawfish shells as green precursors. The relationship between quantum yield (QY) and protein content of six crawfish shells treated with different alkalis was investigated. The synthesized NSCDs displayed a large QY of 18.57 %, which was higher than most of the chitin-derived CDs. Due to the oxidation of hydroxyl radicals, adding H 2 O 2 and horseradish peroxidase (HRP) quenched the fluorescence of NSCDs, resulting in a detection limit (LOD) of 1.25 μM for H 2 O 2 . The addition of pentachlorophenol (PCP) was supposed to consume part of the hydroxyl radicals and protect NSCDs from being oxidized. Accordingly, a facile and rapid “off–on” fluorescence sensor was developed to detect PCP with a LOD of 2.30 μM. Further, the method described was successfully used to detect PCP in three real samples.
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INORGANIC CHEMISTRY
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2022
·
IF 5.436
Shan Jiang,Xuemei Jia,Jing Cao,Haili Lin,Fang Li,Yue Sun,Shifu Chen
Photocatalytic overall water splitting simultaneously generates O2 and H2; this is a potential strategy to solve the energy shortage problem. Elemental phosphorus (RP) displays ultralow visible light performance for O2 and H2 generation; thus, a novel α-Fe2O3/RP composite is designed and prepared by a low-temperature hydrothermal method via loading a trace amount of α-Fe2O3. In the experiment, the 1.5% α-Fe2O3/RP composite showed the best overall water splitting performance, which is 6.9 times that of bare RP. Through various characterization studies, the recombination rate of charges is significantly reduced. It is largely ascribed to the matched energy band structure of the two photocatalysts and the interface contact between α-Fe2O3 and RP, which efficiently separates the photocarriers through an S-scheme mode and realizes the obvious enhancement of overall water splitting performance. Moreover, α-Fe2O3/RP maintains high activity when it is persistently irradiated for 15 cycles. The research provides insight into the exploitation of low-cost, high-activity, and stable RP-based photocatalysts to achieve visible light induced overall water splitting activity to generate O2 and H2.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Yunqing Wu,Yuxin Chen,Shiqin Zhang,Lizhi Zhang,Jingming Gong
A novel and ultrasensitive electrochemiluminescent (ECL) bioassay has been developed for the detection of atrazine (ATZ), whereby bifunctional S, N-codoped carbon dots (S, N-CDs) and activated mesoporous bicarbons (BCs) have been innovatively integrated to synergistically amplify the ECL signal. When endogenous dissolved O 2 is used as a coreactant, its sluggish reduction hinders the enhancement of ECL intensity of the luminophore, thus restricting its further application in bioanalysis . Here, bifunctional S, N-CDs severe as not only the ECL luminophore but the coreaction accelerator of dissolved O 2 to generate more intermediates to boost the coreaction without using any other coreactant and coreaction accelerator. The as-formed nanoarchitectures of BCs possess enlarged surface area as the nanocarriers . They could provide adequate active sites for immobilization of tyrosinase (Tyr), which greatly prompts the ECL bioassay applications. Such a smart integration of bifunctional S, N-CDs, activated mesoporous BCs and the enzyme inhibition reaction achieves a unique and attractive high-performance signal-on ECL bioassay, realizing ultrasensitive detection of ATZ. Under the optimal condition, this bioassay exhibits two linear ranges, from 0.0001 to 0.01 μg L −1 and 0.01–20 μg L −1 with a detection limit of 0.08 ng L −1 at signal to noise ratio of 3. The as-fabricated assay is sensitive and economical, opening a new way for the enhancement of ECL signal output and a versatile strategy for ultrasensitive ECL bioanalysis.
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Advanced Science
·
2023
·Vol. 11
·期 5
·2305439
·
IF 15.1
Fucheng Zhang,Huanhuan Dong,Yi Li,Dengjiang Fu,Lu Yang,Yupeng Shang,Qiuyang Li,Yuwen Shao,Wu Gang,Tao Ding,Tao Chen,Wenkun Zhu
Photo-assisted uranium reduction from uranium mine wastewater is expected to overcome the competition between impurity ions and U(VI) in the traditional process. Here, B-TiO 2 @Co 2 P-X S-scheme heterojunction with metal-oxygen-hydrogen (M-O-H) is developed insitu modification for photo-assisted U(VI) (hexavalent uranium) reduction. Relying on the DFT calculation and Hard-Soft-Acid-Base (HSAB) theory, the introduction of metal-oxygen-hydrogen (M-O-H, hard base) metallic bonds in the B-TiO 2 @Co 2 P-X is found to enhance the hydrophilicity and the capture capability for uranyl ion (hard acid). Accordingly, B-TiO 2 @Co 2 P-500 hybrid nanosheets exhibit excellent U(VI) reduction ability (>98%) in the presence of competing ions. By self-consistent energy band calculations and in-situ KPFM spectral analysis, the formation of the internal electric field between B-TiO 2 and Co 2 P at the heterojunction is proven, offering a strong driving force and atomic transportation highway for accelerating the S-scheme charge carriers directed migration and promoting the photocatalytic reduction of uranium. This work provides a valuable route to explore the functionally modified photocatalyst with high-efficiency photoelectron separation for U(VI) reduction.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Ran Li,Deliang Zhang,Huamao Chen,Shaozhen Wang,Yunyun Ling,Caihong Fang
Developing high-performance and low-cost electrocatalysts for the oxygen evolution reaction (OER) and urea oxidation reaction (UOR) is essential for hydrogen production. Herein, we prepared Zn,S-incorporated Fe,Co layered double hydroxide (ZnCoFeS–LDH) nanosheets on nickel foam via a two-step hydrothermal reaction. The attractive two-dimensional (2D) nanosheet morphology with ultrathin thickness offers abundant active sites, promotes the adsorption and desorption of intermediates on the surface, and also facilitates mass transportation. The electronic structure of ZnCoFeS–LDH was modified, which thus improves their conductivity, offers high-valence iron ions (Fe3+), and therefore intrinsically enhances their electrocatalytic properties. In particular, the constructed crystalline/amorphous interfaces benefit electron transfer between different phases. As a proof of concept, we examined the electrocatalytic performances of ZnCoFeS–LDH nanostructures to both the OER and UOR. As a result, the ZnCoFeS–LDH nanosheets exhibit excellent catalytic OER activity, with low overpotentials of 202, 217, 238, and 261 mV to achieve current densities of 10, 20, 50, and 100 mA cm–2, respectively, which are remarkably enhanced in comparison with that of commercial RuO2. Furthermore, they also demonstrate outstanding durability after long-term (48 h) and cycling (5000 cycles) measurements. Moreover, the ZnCoFeS–LDH nanosheets also possess superior UOR activity. The potentials were measured to be as low as 1.313, 1.334, 1.366, and 1.398 V to reach current densities of 10, 20, 50, and 100 mA cm–2, respectively, with high long-term stability after 20 h.
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