INTERNATIONAL JOURNAL OF PHOTOENERGY
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2012
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IF 1.769
Quan Gu,Huaqiang Zhuang,Jinlin Long,Xiaohan An,Huan Lin,Huaxiang Lin,Xuxu Wang
The C-doped CdO photocatalysts were simply prepared by high-temperature solid-state process. The as-prepared photocatalysts were characterized by X-ray powder diffraction (XRD), diffuse reflectance spectroscopy (UV-Vis DRS), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results demonstrated that the carbon was doped into CdO, resulting in the red-shift of the optical absorption of CdO. The photocatalytic behavior of CdO and C-doped CdO was evaluated under the visible light irradiation by using the photocatalytic hydrogen evolution as a model reaction. The C-doped CdO photocatalysts had higher photocatalytic activity over parent CdO under visible light irradiation. The results indicated that the H2 production was due to the existence of CdS and the enhancement of visible light photocatalytic activity of H2 production was originated from the doping of carbon into the CdO lattice. The probably reaction mechanism was also discussed and proposed.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Rui Zhang,Jingyao Guo,Yupeng Wang,Rundong Sun,Guangzhu Dong,Xinru Wang,Guizhen Du
The increased usage of bisphenol S (BPS) results in wide distribution in pregnant women. In this study, pregnant mice were given multiple-dose BPS during gestation. Results showed that prenatal BPS exposure (50 μg/kg/day) induced increased weight gain, dyslipidemia, higher liver triglyceride (TG), adipocyte hypertrophy, and hepatic lipid deposition in male offspring . Exosomes play important roles in regulating lipid metabolism . Here, serum exosomes and adipose miRNA sequencing of male offspring indicated a remarkable decrease in miR-29a-3p expression. To clarify whether adipocyte-derived exosomes mediate hepatic lipid deposition, exosomes were extracted from BPS-treated adipocytes and co-cultured with hepatocytes. These exosomes could be taken up by hepatocytes and promoted lipid deposition, and notably, exosomal miR-29a-3p was downregulated. Furthermore, miR-29a-3p knockdown in adipocyte-derived exosomes promoted hepatocyte lipid deposition, whereas overexpression led to the opposite effect. Also, the role of miR-29a-3p was demonstrated in hepatocytes by overexpressing or knocking it down. Subsequent studies have shown that miR-29a-3p can promote lipid deposition by directly targeting Col4a1 . Taken together, prenatal BPS exposure could lead to lower miR-29a-3p yield in adipocyte-derived exosomes and decrease miR-29a-3p content transported to hepatocytes, which further negatively regulate Col4a1 and promote hepatic lipid deposition. Our findings provided clues to maternal environmental exposure-induced liver metabolic diseases.
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2023
·
IF 13.1
Zhiyao Chu,Junqi Li,Hong Yong Sohn,Chaoyi Chen,Xiao Huang,Yuanpei Lan,Arun Murali,Junshan Zhang
In this work, novel CeO 2 –C-g-C 3 N 4 S-scheme heterojunctions with significantly enhanced photocatalytic performance were prepared for the first time by a facile one-step molten KCl–LiCl method. The formation mechanism of CeO 2 –C-g-C 3 N 4 was discussed, where g-C 3 N 4 turned to C by carbonizing and the surface C content was adjusted by controlling the synthesis conditions. The photocatalytic property of the ternary composites first increased and then decreased with synthesis temperature and time. The 580 °C 4h CeO 2 –C-g-C 3 N 4 exhibited the best performance towards MB (Methylene blue) and TC (Tetracyclines) degradation with a removal degree of 99.9% and 92.5%, respectively. The surface C/N ratio was a key index that influenced the photocatalytic performance, and was calculated to be 0.918–1.352 for various CeO 2 –C-g-C 3 N 4 catalysts. The 580 °C 4h CeO 2 –C-g-C 3 N 4 had an appropriate C/N ratio of 0.930 and a narrow band gap. The formed S-scheme 2D heterojunctions and generated C clearly promoted the separation of photo-excited e - / h + . Besides, it was indicated that e - and · O 2 − were the main active species for TC photodegradation . The 580 °C 4h CeO 2 –C-g-C 3 N 4 exhibited a large BET surface area, high negative zeta potential , strong π-π electron donor-acceptor interaction, and an excellent MB adsorption ability. It was evident that chemisorption on catalyst surface played an important role for adsorbing MB. The formation mechanism of CeO 2 –C-g-C 3 N 4 and the effects of the surface C/N ratio on photocatalytic performance, determined in this work, offer new insights for preparing and structuring highly effective photocatalysts , which is expected to promote further photocatalytic and adsorption applications.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Fang Fang,Shaohua Zhang,Chaofan Chen,Xueying Wang,Chuannan Luo,Qin Wei
Curcumin can be used to treat cancer diseases, however the side effects of excessive use are serious, and the dosage of curcumin should be accurately controlled. In this study, a fluorescence nanosensor using carbon quantum dots (N,S-CQD) embedded multifunctional molecularly imprinted polymer (N,S-CQD@MIP) composite was developed as a probe for the detection of curcumin. The N,S-CQD@MIP was synthesized by sol-gel method and found a maximum emission peak at 430 nm. The curcumin can be binded selectively by the specific interaction between recognition sites and template molecules. The corresponding sensing mechanism of N,S-CQD@MIP for the detection of curcumin is the result of fluorescence inner filter effect and the static quenching effect. The fluorescence nanosensor using N,S-CQD@MIP for the curcumin detection has a good linear relationship in the range of 0.339–136.0 μM, and the corresponding detection limit is as low as 1.357 nM. This method has been applied to detect the curcumin in real samples with the recoveries of 97.6–103.7%. These results indicate that N,S-CQD@MIP are potential sensing materials for curcumin detection.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Chao Peng,Lijuan Yue,Yu Cui,Xiangfei He,Shoudong Xu,Chunli Guo,Meiqing Guo,Han Chen
Sodium ion batteries (SIBs) attract most of the attention as alterative secondary battery systems for future large-scale energy storage and power batteries due to abundance resource and low cost. However, the lack of anode materials with high-rate performance and high cycling-stability has limited the commercial application of SIBs. In this paper, Cu 7.2 S 4 @N, S co-doped carbon (Cu 7.2 S 4 @NSC) honeycomb-like composite structure was designed and prepared by a one-step high-temperature chemical blowing process. As an anode material for SIBs, Cu 7.2 S 4 @NSC electrode exhibited an ultra-high initial Coulomb efficiency (94.9%) and an excellent electrochemical property including a high reversible capacity of 441.3 mAh g −1 after 100 cycles at 0.2 A g −1 , an excellent rate performance of 380.4 mAh g −1 even at 5 A g −1 , and a superior long-cycle stability with a capacity retention rate of approximately 100% after 700 cycles at 1A g −1 .
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Lin Zhang,Jili Yuan,Qinqin Xu,Fazhi Zhang,Qi Sun,Haibo Xie
Noble-Metal-Free nitrogen-doped carbon-based materials are promising electrocatalysts for oxygen reduction reaction (ORR), yet it remains a great challenge to construct efficient porous non-noble metal nitrogen-doped carbon (M-N-C) catalysts with uniform distribution, due to the easy aggregation of metals. Herein, we reported the synthesis and assessment of a novel and efficient noble-metal-free catalyst for oxygen reduction reaction (ORR) from pyrolysis of a cobalt-containing cellulosic poly(ionic liquid) (Co-N-C). The prepared Co-N-C catalyst possesses high surface area , hierarchical porous structure, well-dispersed Co nanoparticles and large amounts of low-coordinated Co active sites. Especially, the Co-N-C-850 sample exhibits a high ORR activity (E onset = 0.827 V, E 1/2 = 0.74 V) that can rival 20 wt% commercial Pt/C (E onset = 0.833 V, E 1/2 = 0.71 V) in alkaline media. Moreover, the Co-N-C-850 sample also shows excellent anti-methanol poisoning activity and long-term stability toward ORR compared with commercial Pt/C. Our study provides a promising avenue both for the development of non-noble M-N-C catalysts for fuel cells and the functional utilization of cellulose .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
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IF 7.2
Mingyuan Zhang,Shuozhen Hu,Xinsheng Zhang
Heteroatom-doped transition metal electrocatalysts supported on carbon materials are widely-recognized as the promising catalysts for oxygen reduction reaction (ORR). Here, we describe the one-pot method of preparing the Cu-based PAT 1 -Cu x /KB catalyst with Cu/N/S doped graphene-like nanosheets . For the obtained catalyst, Cu 2+ ions catalyzed the polymerized 2-aminothiazole organic monomers into nanosheet and simultaneously in-situ doped Cu, N, S atoms into the carbon matrix. The amount of Cu 2+ ions affected the geometry structure, as well as the formation of Cu–N structure and C–S–C bond of PAT 1 -Cu x /KB catalyst. Cu 2 S crystals with ORR catalytic ability were also generated in the catalysts. The Cu–N structure in the catalyst regulates the d -electron density of inert copper through the synergistic effect of electronic connection between copper and nitrogen atoms . N and S doped in the carbon skeleton changes the spin density and charge distribution of near carbon atoms. Therefore, PAT 1 -Cu 0.33 /KB catalyst with graphene-like nanosheets, Cu–N structure, C–S–C bond, and Cu 2 S crystals exhibits excellent activities with E 1/2 = 0.84 V and high limit-current density of 5.25 mA cm −2 for ORR.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 7
·e53493
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IF 3.057
Zhaohui He,Yinbiao Feng,Cong Wang,Junjiao Yang,Tianwei Tan,Jing Yang
The green sustainability of the plastic industry always gives impetus to develop the biobased and biodegradable polymers for substituting chemical products. In this study, aliphatic poly(ethylene succinate)-based poly(ether ester)s (PES-based PEE) were firstly explored via one pot/two-component industrial melt polycondensation of succinic acid (SA) and ethylene glycol (EG) in the catalytic combination of titanium tetraisopropoxide (TTP) and methylsulfonic acid (MSA). Their thermal properties and mechanical behavior were analyzed in detail. Based on complementary properties of PES-based PEEs and poly(lactic acid) (PLA) in the aspect of the flexibility and ductility, the copolymerization of poly(ethylene succinate)-poly(diethylene glycol succinate) (PES-PDES) with PLA with low molecular weight was further systematically elaborated and characterized. The results from differential scanning calorimeter showed all the copolymers with different LA contents were amorphous without the melting temperatures. Only one α relaxation revealed by DMA indicated PES-PDES and PLA segments were random distribution and compatible. The monotonical decrease in glass transition temperatures ( T g s) hinted the mobility enhancement of the copolymers with increasing PES-PDES contents. All the copolymers PES-PDES-PLAs exhibited relatively high thermal degradation temperature with T 5% above 280°C. The mechanical properties and degradable behavior of the copolymers were significantly ameliorated by changing the composition fractions of PES-PDES and PLA in the architecture.
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BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2022
·Vol. 46
·期 2
·171-181
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IF 3.434
Zhang Yin-Jun,Wei Li-Tian,Zhou Ming-Peng,Wei Chun,Yu Xin-Jun
( R )-N-(2,6-dimethylphenyl) aminopropionic acid methyl ester (( R )-DMPM) is an important chiral intermediate of the fungicide N-(2,6-Dimethylphenyl)-N-(methoxyacetyl)-alanine methyl ester (( R )-Metalaxyl). In this study, (1) D3520 (macroporous acrylic anion resin), selected from the ten resins, was used to immobilize the esterase from Pseudochrobactrum asaccharolyticum WZZ003 (PAE07) for resoluting the ( R,S )-DMPM to obtain ( R )-DMPM. (2) Up to 20 g/L PAE07 could be immobilized onto D3520 with a high enzymatic activity of 32.4 U/g. Moreover, the Km and Vmax values of 19.1 mM and 2.8 mM/min for D3520-immobilized PAE07 indicated its high activity and stereoselectivity. (3) The optimal temperature and pH for the immobilized PAE07 were 40 ℃ and 8.0, and substrate concentration was up to 0.35 M. After 15 h reaction, the conversion rate from ( R,S )-DMPM to ( R )-DMPM was 48.0% and the e.e.p and E values were 99.5% and 1393.0, respectively. In scale-up resolution, 200 g/L substrate and 12.5 g immobilized esterase PAE07 condition, a conversion rate from substrate to product of 48.1% and a product e.e.p of 98% were obtained within 12 h, with the activity of immobilized PAE07 retained 80.2% after 5 cycles of reactions. These results indicated that the D3520-immobilized esterase PAE07 had great potential for enzymatic resolution of ( R,S )-DMPM to prepare ( R )-Metalaxyl.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Jiafeng Qian,Chenyi Wang,Xiaojing Zhang,Xiaoyan Zhao,Jian Li,Qiang Ren
Anion exchange membranes with enough alkaline stability and ionic conductivity are essential for water electrolysis . In this work, a class of anion exchange membranes (PAES-TMI-x) with dense 1,2,4,5-tetramethylimidazolium side chains based on poly(aryl ether sulfone)s are prepared by aromatic nucleophilic polycondensation , radical substitution and Menshutkin reaction . Their chemical structure and hydrophilic/hydrophobic phase morphology are characterized by hydrogen nuclear magnetic resonance ( 1 H NMR) and atomic force microscope (AFM), respectively. The water uptake, swelling ratio and ionic conductivity for PAES-TMI-x are in the range of 23.8%–48.3%, 8.3%–14.3% and 18.22–96.31 mS/cm, respectively. These AEMs exhibit high alkaline stability, and the ionic conductivity for PAES-TMI-0.25 remains 86.8% after soaking in 2 M NaOH solution at 80 °C for 480 h. The current density of 1205 mA/cm 2 is obtained for the water electrolyzer equipped with PAES-TMI-0.25 in 2 M NaOH solution at 2.0 V and 80 °C, and the electrolyzer also has good operation stability at current density of 500 mA/cm 2 . This work is expected to provide a valuable reference for the selection and design of cations in high-performance AEMs for water electrolysis.
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ACS Earth and Space Chemistry
·
2023
·
IF 3.4
Hao Tian,Xue-Bin Zhang,Yin-Ping Li,Qing He,Na-Na Tian,Song-Hai Wu,Xu Han
Although inorganic Fe(IV)═O oxo and Fe(III)-OOH peroxo have attracted more attention in aqueous environments, direct evidence for the characterization and identification of those oxidizing species is still lacking. In this study, the doped Cu/Co increases the reactivity of ferrihydrite/hematite in oxidizing As(III) by S(IV)-O2 under alkaline and dark conditions. Quenching experiments exclude the contributions of ·OH, O2•–, SO3•–, SO4•–, SO5•–, HSO5–, and H2O2 and confirm that peroxo and oxo are primary oxidizing species in As(III) oxidation. Electrochemical analyses indicate that Fe(IV)═O oxo and Fe(III)-OOH peroxo are primarily located on the surface of ferrihydrite and hematite. Selective oxidation of methyl phenyl sulfoxide and methyl phenyl sulfide to the corresponding oxidation products further reveals the presence of ≡Fe(IV)═O oxo on both ferrihydrite and hematite, and the doped Cu/Co significantly decreases the produced ≡Fe(IV)═O oxo on ferrihydrite, while increases the produced ≡Fe(IV)═O oxo on hematite. Meanwhile, selective oxidation of benzyl alcohol to benzaldehyde indicates the presence of ≡Fe(III)-OOH peroxo on both ferrihydrite and hematite, and the doped Cu/Co apparently increases the produced ≡Fe(III)-OOH peroxo on ferrihydrite and hematite. Raman analysis further reveals the presence of ≡Fe(IV)═O oxo and ≡Fe(III)-OOH peroxo on pure and metal-doped ferrihydrite/hematite, which also confirms that the doped Cu/Co decreases the produced ≡Fe(IV)═O oxo on ferrihydrite and increases ≡Fe(IV)═O oxo on hematite, while apparently increasing ≡Fe(III)-OOH peroxo on both ferrihydrite and hematite. This study enriches our understanding on the oxidizing species in the S(IV)-mediated oxidation processes under alkaline conditions, providing new insight on the oxidation reactivity of surface peroxo and oxo species mediated by the doped metal ions.
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Journal of Water Process Engineering
·
2022
·
IF 7.34
Xin Wang,Xue-Song He,Chun-Yu Li,Shi-Lin Liu,Wen Lu,Zheng Xiang,Yang Wang
The development of efficient sonocatalysts is of great significance to the treatment of antibiotic wastewater. Herein, an S-scheme sonocatalyst Cu 2 O/BiFeO 3 has been fabricated using a simple synthesis method, in which Cu 2 O nanoparticles grow on the surface of BiFeO 3 . Tetracycline (TET) was selected as a representative pharmaceutical model to systematically evaluate the sonocatalytic performance of the Cu 2 O/BiFeO 3 . The experimental results showed that optimized Cu 2 O/BiFeO 3 (CBF-3) has superior sonocatalytic performance to TET (98.0 %, 0.02302 min −1 ), which is much higher than that of pure BiFeO 3 (54.6 %, 0.00515 min −1 ). Combined with the experimental result and characterization analysis, the sonodegradation mechanism was discussed. The improved sonocatalytic performance can be ascribed to the S-scheme charge transfer mechanism between Cu 2 O and BiFeO 3 , which can simultaneously inhibit sonoelectron-hole recombination, promote carrier transfer, maintain high redox capacity, and generate more active substance. The possible intermediate products and degradation pathways of TET over CBF-3 were analyzed by ion chromatography and liquid chromatography-mass spectrometry. Furthermore, the results of the bacterial toxicity test indicated that the toxicity of the reaction solution decreased significantly after sonodegradation. This study provides a simple way for the rational design and successful preparation of S-scheme sonocatalyst with promising applications in the remediation of the water environment.
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