CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Hao Lin,Jie Yang,Yong-feng Liu,Fan-ju Zeng,Xiao-Sheng Tang,Zhi-qiang Yao,Hong-ling Guan,Qian Xiong,Jia-er Zhou,Dao-fu Wu,Juan Du
As a promising energy-saving technique, the eco-friendly and low-cost solid-state white light-emitting diodes (WLEDs) based on quantum dots (QDs) have been widely studied. Herein, a WLED device prepared by core–shell structure nanocomposites based on Ag-In-S/ZnS@SiO 2 quantum dots (AIS@SiO 2 ) and carbon quantum dots (CDs) was successfully constructed. CDs were combined onto the surface of AIS@SiO 2 QDs to synthesize Ag-In-S/ZnS@SiO 2 -Carbon quantum dots (AIS-CDs) nanocomposites with a white-light emission, which successfully overcome the quenching effect of CDs induced by conventional aggregation. The as-prepared AIS-CDs nanocomposites presented high stability and a photoluminescence quantum yield (PLQY) of 35%. Moreover, the corresponding AIS-CDs nanocomposites-based WLEDs demonstrated the color coordinate of (0.32, 0.33), which is comparable to the pure white light (0.33, 0.33); furthermore, the luminous efficiency of the as-prepared WLEDs showed 15.1 lm W −1 . These results reported herein may open up a new avenue for the development of high-performance, low-cost, and environmentally-friendly WLEDs.
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Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 8
·4264-4272
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IF 5.503
Wen Huang,Daqian Ruan,Hui Chen,Kai Hu,Juan Wen,Wenqi Yan,Yusong Zhu,Yi Zhang,Nengfei Yu,Yuping Wu
Suppressing rapid capacity decay caused by the shuttle effect of dissolved lithium polysulfides between two electrodes is crucial to the realization of a practical lithium–sulfur (Li–S) batteries. Herein, the shuttle effect of polysulfides was efficiently inhibited by using a lightweight and thin functional separator in the form of coating three-dimensional interconnected nitrogen-doped graphene-like porous carbon nanosheets on one surface of a commercial polypropylene separator. This structure for a thin functional separator heightens the reversible capacity and cycle performance by doping nitrogen to chemically bond with polysulfides and the porous carbon layer to physically block polysulfides. As a result, the Li–S batteries based on the functional separators deliver an initial capacity of 1169.0 mA h g−1 at current rate of 1C and a substantial capacity of 845.3 mA h g−1 after 500 cycles, corresponding to a low capacity decay of only 0.055% per cycle. Even at a high rate of 3C, the batteries can still deliver a high reversible capacity of 743.6 mA h g−1 with good cycle performance.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Jingzhen Zhang,Chunyang Yu,Junyu Lang,Yongfeng Zhou,Baoxue Zhou,Yun Hang Hu,Mingce Long
Photocatalytic H 2 O 2 production (PHOP) on graphitic carbon nitride (GCN) at neutral pHs is limited by the sluggish oxidation of sacrificial alcohols and insufficient protons. In our work, the PHOP over a series of K intercalated triazine (KTCN) or tri-s-triazine units (KTTCN) reached 11–32 folds of GCN in the presence of only 0.5 vol% isopropanol, and a positive correlation between the H 2 O 2 production and the K contents was found. The critical role of K was revealed as that K intercalation creates Lewis acidic sites for isopropanol adsorption and strengthens Lewis basic sites for hydrogen abstraction and proton release. The improved alcohol oxidation and enhanced O 2 chemisorption synergistically result in dramatically accelerated PHOP over KTTCN. The findings provide the understanding of the preliminary active site dependent PHOP mechanism and bring insights for design of carbon nitride polymers with desirable photocatalytic performance.
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Molecular Catalysis
·
2020
·
IF 3.687
Hongbing Song,Yule Liu,Yongjie Wang,Bingxiao Feng,Xin Jin,Tingting Huang,Meng Xiao,Hengjun Gai
In this study, a series of hypercrosslinked poly(ionic liquid)s (HCPILs) formed from imidazolium tetrachloropalladate were successfully fabricated for selective hydrogenation of phenylacetylene. Its textural properties can be tuned by the different molar ratios of reactants, thereby adjusting its active sites. The synthetic HCPILs were analyzed using various characterization techniques. Due to the constraint of the microporous structure and the charge effect of ionic liquid moieties in the HCPILs, palladium nanoparticles generated from HCPILs were reduced in situ during hydrogenation of phenylacetylene and highly dispersed. Amongst which catalyst a-4 with the largest pore-volume performed the best selectivity (97.3 %) to styrene at 96 % phenylacetylene conversion under the conditions of 308 K and 1 atm H 2 pressure. Furthermore, the activity and selectivity of the catalyst did not change considerably in solvents with different polarities. Even after repeated the catalytic experiments for five times, the catalyst displayed no significant loss for activity and selectivity. This work shows industrial application potential and a developing direction in the selective hydrogenation process.
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POLYMER INTERNATIONAL
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2020
·Vol. 69
·期 12
·1267-1274
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IF 2.574
Xin Liu,Yanwei Gao,Xuanbo Zhu,Yingshuang Shang,Zengduo Cui,Qixing Yan,Haibo Zhang
Two novel poly(arylene ether sulfone)s with high biphenylene content (BDS-PES and BDS-PDBES) are prepared by nucleophilic substitution polymerization of synthesized 4,4′-bis(4-hydroxyphenyl)diphenyl sulfone (BDS) with 4,4′-sulfonylbis(fluorobenzene) and 4,4-bis[(4-chlorophenyl)sulfonyl], respectively. The prepared polymers show high glass transition temperature and excellent high-temperature mechanical properties. The glass transition temperature of BDS-PDBES with higher biphenylene content is as high as 300 °C, and BDS-PDBES can still maintain its 30% storage modulus at 295 °C. In addition, the two novel polymers also show excellent thermal stability ( T d5 = 526 °C), high elongation at break ( ε ≈ 20%), good tensile strength (73 MPa) and modulus (1.73 GPa) and good thermal conductivity ( λ 300°C = 0.28 W ·m −1 ·K −1 ).
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Small
·
2020
·Vol. 16
·期 7
·1906634
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IF 11.459
Zhuosen Wang,Jiadong Shen,Shaomin Ji,Xijun Xu,Shiyong Zuo,Zhengbo Liu,Dechao Zhang,Renzong Hu,Liuzhang Ouyang,Jun Liu,Min Zhu
Lithium–sulfur batteries (LSBs) are considered as one of the best candidates for novel rechargeable batteries due to their high energy densities and abundant required materials. However, the poor conductivity and large volume expansion of sulfur and the “shuttle effect” of lithium polysulfides (LPSs) have significantly hindered the development and successful commercialization of LSBs. Bean-like B,N codoped carbon nanotubes loaded with Co nanoparticles (Co@BNTs), which can act as advanced sulfur hosts for the novel LSB cathode, are fabricated. Uniform graphitic nanotubes improve the conductivity of the electrode and load more electroactive sulfur and buffer volume expansion during the electrochemical reaction. In addition, loaded Co nanoparticles and codoped B,N sites can significantly suppress the “shuttle effect” of LPSs with strong chemical interaction. It is established that the Co nanoparticles and codoped B,N can provide more active sites to catalyze the redox reaction of sulfur cathode. This stable Co@BNTs-S cathode displays an exceptional electrochemical performance (1160 mA h g −1 after 200 cycles at 0.1 C) and outstanding stable cycle performance (1008 mA h g −1 after 400 cycles at 1.0 C with an extremely low attenuation rate of 0.038% per cycle).
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Progress in Natural Science-Materials International
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2021
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IF 3.607
Weiqin Li,Mengyuan Yue,Huinan Guo,Zhaoxia Yuan,Yafei Liu,Kai Chen,Juming Gu,Yijing Wang
The manganese sulfide (MnS) has attracted more attention as anode material on energy storage and conversion field, owing to its high theoretical capacity (616 mA h g −1 ) and good electrochemical activity. However, low electronic conductivity and large volume expansion during charge-discharge processes have limited its further application. In order to address above mentioned problems, the composites, MnS nanoparticles embedded in N,S-codoped porous carbon skeleton (named as MnS/N,S–C composites), herein have been prepared successfully using metal organic framework (Mn-NTA) as template. The porous carbon skeleton not only can enhance electrode conductivity, but also relieve volume expansion during charge-discharge processes. Thus, the rational design towards electrode architectures has endowed MnS/N,S–C nanocomposites with superior electrochemical performance, which delivers the specific capacities of 676.7 mA h g −1 at the current density of 100 mA g −1 .
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APPLIED SURFACE SCIENCE
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2021
·
IF 6.707
Sleshi Fentie Tadesse,Dong-Hau Kuo,Worku Lakew Kebede,Girma Sisay Wolde
Developing low-cost and visible-light-driven metal oxide and sulfide-based photocatalysts for the degradation of organic dyes has been a major area of research to mitigate environmental pollution. In this study, a low-cost and facile precipitation method at low temperature of 95 °C was used to synthesize visible-light-driven Nd 2 O 3 /Mo(S,O) 3-x ·0.34H 2 O heterojunctions (NdMoOS). The crystal structure, elemental composition, optical, and electrical properties of as-prepared materials were investigated using various analytical techniques. Organic dyes of methyl orange (MO), Rhodamine B (RhB), and Methylene blue (MB) were selected as model organic pollutants to evaluate the photocatalytic efficiency of as-synthesized materials under visible light irradiation. 20 mol% NdMoOS nanocomposite showed excellent degradation efficiency and it decomposed 98.8%, 99.9%, and 99.8% of MO, RhB, and MB after 120 min, 90 min, and 90 min visible light irradiation, respectively. HPLC-MS analysis further confirms the complete removal of dyes. The formation of heterojunction, high charge separation, and low recombination rate of photoinduced e - -h + pairs can contribute to the enhanced photocatalytic activity. Superoxide radicals (O 2–• ), hydroxyl radicals (HO • ), and holes (h + ) were identified as major oxidative species involved in the photocatalytic degradation mechanisms of MO, RhB, and MB dyes.
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JOURNAL OF NANOPARTICLE RESEARCH
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2019
·Vol. 21
·期 11
·1-8
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IF 2.009
Cao Sheng,Dai Chencheng,Zhao Jialong,Zou Bingsuo
In this work, a facile approach to synthesize the Ag- and Mn-codoped Zn-In-S nanocrystals (NCs) with dual emissions as ratiometric temperature sensors is reported. The as-synthesized codoped Zn-In-S NCs have a uniform size distribution and exhibit a zinc blende ZnS phase structure. Moreover, the as-produced codoped NCs show dual emission peaks which center at green and orange-red regions and have a photoluminescence quantum yield (PL QY) up to 45%. The time-resolved PL spectroscopy and X-ray photoelectron spectroscopy characterizations reveal that the dual emissions of these NCs are derived from the intrinsic emission of Ag + and Mn 2+ , respectively. Moreover, the relative intensity ratio of dual emissions can be tailored by adjusting the Ag and Mn doping concentrations. The as-built ratiometric temperature sensors based on the codoped NCs exhibit a thermometric sensitivity of ~ 0.17% K -1 over a broad window of 80–200 K, suggesting that these codoped Zn-In-S NCs are promisingly used for bio-optical ratiometric temperature sensing.
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BIOMACROMOLECULES
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2019
·
IF 5.667
Yufei Bian,Xuefei Leng,Zhiyong Wei,Zefeng Wang,Zhu Tu,Yanshai Wang,Yang Li
A facile method in combination of “grafting from” and “end-functionalization” was developed for the synthesis of fluorescent highly branched poly(l-lactide)s (PLLA-COU) via ring opening polymerization (ROP) and esterification end-capping. These resulting PLLA-COU with four kinds of architectures, including linear, star, linear-comb, and star-comb structures, were subjected to characterization and application as fluorescent visible paclitaxel-loaded microspheres. The mutual effects of architecture and end-groups on thermal and fluorescence properties, enzymatic degradation, and drug release behaviors were focused. Contrast to linear and star PLLA-COU, two comb-shaped analogues demonstrated higher fluorescence quantum yield, faster drug release, and lower enzymatic degradation rate. All the fluorescent microspheres could maintain fluorescence traceability. The fluorescent PLLA-COU displayed negligible toxicity and good biocompatibility. This work highlights that the fluorescent highly branched poly(l-lactide)s are properties-tailored and used as fluorescent visible drug delivery systems (DDS) for potential theranostic applications.
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Frontiers in Pharmacology
·
2019
·
IF 3.845
Shi Chenxi,Hao Beili,Yang Yang,Muhammad Ishfaq,Zhang Yuanyuan,Chang Yicong,Li Ying,Li Changwen,Li Rui,Liu Fangping
Acetaminophen (APAP) is an analgesic–antipyretic drug and widely used in clinics. Its overdose may cause serious liver damage. Here, we examined the mechanistic role of c-Jun N-terminal kinase (JNK) signaling pathway in liver injury induced by different doses of APAP. Male mice were treated with APAP (150 and 175 mg·kg−1), and meanwhile JNK inhibitor SP600125 was used to interfere APAP-induced liver damage. The results showed that JNK signaling pathway was activated by APAP in a dose-dependent manner. C-Jun N-terminal kinase inhibitor decreased JNK and c-Jun activation significantly (P < 0.01) at 175 mg·kg−1 APAP dose, and phosphorylation levels of upstream proteins of JNK were also decreased markedly (P < 0.05). In addition, serum aminotransferases activities and hepatic oxidative stress increased in a dose-dependent manner with APAP treatment, but the levels of aminotransferases and oxidative stress decreased in mice treated with JNK inhibitor, which implied that JNK inhibition ameliorated APAP-induced liver damage. It was observed that apoptosis was increased in APAP-induced liver injury, and SP600125 can attenuate apoptosis through the inhibition of JNK phosphorylation. Meanwhile, glutathione S-transferases A1 (GSTA1) content in serum was enhanced, while GSTA1 content and expression in liver reduced significantly with administration of APAP (150 and 175 mg·kg−1). After inhibiting JNK, GSTA1 content in serum decreased significantly (P < 0.01); meanwhile, GSTA1 content and expression in liver enhanced. These findings suggested that JNK signaling pathway mediated APAP-induced hepatic injury, which was accompanied by varying GSTA1 content and expression in liver and serum.
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INTERNATIONAL IMMUNOPHARMACOLOGY
·
2019
·
IF 3.361
Chunyan Li,Xiao Sun,Ang Li,Min Mo,Zhongxi Zhao
Pulmonary fibrosis (PF) is a disease characterized by diffusing alveolar inflammation and alveolar structural disorders that ultimately lead to pulmonary interstitial fibrosis. S-allylmercaptocysteine (SAMC) as a water-soluble organosulfur garlic derivative exhibits efficient anti-inflammatory and anti-oxidative activities. In this study, we attempted to explore the function of SAMC in inhibiting bleomycin (BLM)-induced pulmonary fibrosis in mice. 0.035 U/g of BLM was intraperitoneally injected into mice twice per week for 4 weeks to induce fibrosis. SAMC (25 and 50 mg/kg) and N-acetylcysteine (NAC, 600 mg/kg) were given to mice for 28 days. The results indicate that SAMC could significantly ameliorate the pathological structure, and decrease inflammatory cell infiltration and pro-inflammatory cytokines in bronchoalveolar lavage fluid (BALF) in BLM-induced pulmonary fibrosis mice. SAMC showed an anti-fibrosis effect by increasing anti-oxidants like HO-1, GSH and SOD as well as decreasing hydroxyproline (HYP) in BLM-induced mice. Mechanistic studies suggested that SAMC alleviated oxidative stress probably by impacting the Nox4/Nrf2 pathways, and played an anti-fibrosis role with decreasing the expression of α-SMA, collagen III, collagen I by suppressing the TGF-β1/Smad pathway. These findings indicate that SAMC may be partially responsible for the therapeutic effect on PF patients.
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