RSC Advances
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2020
·Vol. 10
·期 41
·24425-24433
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IF 3.119
Shenjie Li,Tianyong Zha,Xiaoyu Gong,Qi Hu,Minghui Yu,Jinyu Wu,Ruolan Li,Jiaming Wang,Yanyan Chen
We present a facile route for the synthesis of water-soluble Cu–Cd–Zn–S/ZnS core/shell quantum dots (QDs) by simple pH regulation. The PL spectra of Cu–Cd–Zn–S/ZnS core/shell quantum dots can cover the whole visible light region in the case of only two ratios of Cu/Cd/Zn. The emission wavelength of Cu–Cd–Zn–S/ZnS QDs can be conveniently tuned from 474 to 515 and 548 to 629 nm by adjusting the pH value when the ratios of Cu/Cd/Zn are fixed at 1 : 5 : 80 and 1 : 5 : 10, respectively. It is worth noting that under the condition of a constant Cu/Cd/Zn ratio, the UV-vis absorption spectra do not change with the fluorescence spectra, indicating that the band gap of QDs remains unchanged during the change of pH value. The photoluminescence (PL) quantum yield of the as-prepared QDs with yellow emission is up to 76%. The QDs also show excellent chemical stability after the deposition of the ZnS shell. Luminescent and flexible films are fabricated by combining Cu–Cd–Zn–S QDs with polyvinyl alcohol (PVA). The QD/PVA flexible hybrid films are successfully applied on top of a conventional blue InGaN chip for remote-type warm-white LEDs. As-fabricated warm-white LEDs exhibit a higher color rendering index (CRI) of about 89.2 and a correlated color temperature (CCT) of 4308 K.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Xuefeng Li,Fanzhe Bu,Haiqiu Zhang,Chengji Zhao
After tethering sodium 2-mercaptoethanesulfonate (MTS) to the bromomethylated poly(arylene ether ketone) precursor, a novel clustered sulfonated poly(arylene ether ketone) containing flexible sulfoalkyl groups (MTSPAEK) was prepared and used as polymer electrolyte membrane for application in DMFCs. The chemical structure and the degree of grafting of MTSPAEK copolymers were identified by 1 H NMR spectra. The resulted MTSPAEK copolymers exhibited excellent thermal stability (T d5% > 259 °C) and good mechanical properties (tensile strength at break > 52 MPa). Compared to conventional sulfonated aromatic hydrocarbon polymers, MTSPAEK membranes displayed enhanced oxidative stability in Fenton's reagent owing to the elimination of free radicals by the sulfide groups located on the polymer side chains. Especially, MTSPAEK-2.10 with the highest content of flexible sulfoalkyl groups exhibited a highest proton conductivity of 0.181 S cm −1 at 80 °C. It could be attributed to the obvious hydrophilic/hydrophobic phase-separated structure within the membrane, which was confirmed by AFM images. Moreover, MTSPAEK-2.10 membrane performed a peak power density of 70 mW cm −2 in DMFC when feeding with 2 M methanol at 80 °C, which was comparable to the performance of recast Nafion as reported. Therefore, the combination of good thermal stability and mechanical properties, good oxidative stability, and good methanol barrier performance of MTSPAEK membranes indicated that they have potential to be alternative materials for PEMs in DMFCs.
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Nanomaterials
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2020
·Vol. 10
·期 9
·1633
·
IF 4.324
Zhi Zhang,Zichuan Yi,Liming Liu,Jianjun Yang,Chongfu Zhang,Xinjian Pan,Feng Chi
Lithium-sulfur battery (LSB) will become the next generation energy storage device if its severe shuttle effect and sluggish redox kinetics can be effectively addressed. Here, a unique three-dimensional hollow reduced graphene oxide microsphere decorated with ZnO nanoparticles (3D-ZnO/rGO) is synthesized to decrease the dissolution of lithium polysulfide (LiPS) into the electrolyte. The chemical adsorption of ZnO on LiPS is combined with the physical adsorption of 3D-rGO microsphere to synergistically suppress the shuttle effect. The obtained 3D-ZnO/rGO can provide sufficient space for sulfur storage, and effectively alleviate the repeated volume changes of sulfur during the cycle. When the prepared S-3D-ZnO/rGO was used as the cathode in LSB, an initial discharge specific capacity of 1277 mAh g−1was achieved at 0.1 C. After 100 cycles, 949 mAh g−1can still be maintained. Even at 1 C, a reversible discharge specific capacity of 726 mAh g−1was delivered.Keywords:ZnO;graphene;spray drying;hollow structure;lithium-sulfur battery
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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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INTERNATIONAL IMMUNOPHARMACOLOGY
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2019
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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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REACTIVE & FUNCTIONAL POLYMERS
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2020
·
IF 3.333
Aili Wang,Zilin Liu,Lu Xu,Nan Lou,Mengying Li,Lu Liu
This work reveals the synthesis of poly(ionic liquid)s (poly-ILs) with controllable beading network structure. The synthesis route involved the formation of novel surfactant-free ionic liquid microemulsions and the in situ photo-initiated thiol-ene “click” reaction. Notably, the beading size of poly-IL's networks was adjusted by altering the component proportion of the designed surfactant-free ionic liquid microemulsion. To characterize the as-prepared polymers, FTIR , DLS, NMR, TGA, DSC , SEM and UV–vis were used, and the adsorption isotherm/kinetics studies were carried out. The results show that poly-ILs exhibit distinct adsorption selectivity and high adsorption capacity for nonionic dye disperse red (1080 mg/g), and these dye absorption polymers can be easily regenerated and recycled without a significant decrease. Therefore, the designed poly-ILs indicate remarkable potential in the application of dying wastewater treatment.
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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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MACROMOLECULES
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2019
·
IF 5.997
Cheng-Jian Zhang,Xing-Hong Zhang
Utilization of carbon disulfide (CS2), a low-cost and sulfur-rich one-carbon (C1) feedstock, for making sulfur-containing polymers is important for both polymer chemistry and applied environmental science. However, the production of well-defined sulfur-containing polymers from CS2 and epoxides remains a key challenge. Here, we report a robust coupling reaction of CS2 and epoxides for chemoselectively producing poly(thioether)s and carbonyl sulfide (COS) in one pot. The resultant polymer has exclusive thioether units and a thiol (−SH) terminal. This route takes advantage of oxygen/sulfur exchanges through two consecutive reactions, i.e., cycloaddition of CS2 to epoxides and dethiocarboxylative ring-opening polymerization of the generated cyclic dithiocarbonates. The process can be conducted in ambient air with several commercially available organic bases as catalysts (initiators) and extended to a variety of epoxides, yielding COS and diverse poly(thioether)s with tens of grams. This work furnishes an original and practical strategy for utilizing CS2 as a sulfur feedstock in polymer synthesis.
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ADVANCED POWDER TECHNOLOGY
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2019
·
IF 3.25
Osman Ahmed Zelekew,Dong-Hau Kuo,Hairus Abdullah
Herein, we report the bimetallic (Sn,Zn)(O,S) oxysulfide nanocatalyst with a facile method. The Sn-based catalyst with the addition of Zn was synthesized with the proportions of 0, 20, 30 and 50% of Zn to Sn precursors for preparation. The catalysts were characterized by XRD , TEM , SEM XPS , and UV–vis instruments. The nanocatalysts were also tested for the detoxification of Cr +6 . The Sn-20 catalyst with 20 M percent of Zn(Ac) 2 ·2H 2 O showed an excellent performance for the induced photocatalytic reduction of Cr +6 under visible light irradiation at room temperature. The complete reduction of Cr +6 was achieved within 80 min by Sn-20 catalyst. However, 85.6, 97, and 94% of Cr +6 reductions were achieved within 80 min under visible light illumination by Sn-0, Sn-30, and Sn-50 catalysts, respectively. Hence, the bimetallic (Sn,Zn)(O,S) oxysulfide nanocatalyst will be a candidate and highly potential material for the detoxification of Cr(VI)-containing polluted water.
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REACTIVE & FUNCTIONAL POLYMERS
·
2022
·
IF 4.966
Guoqiang Wang,Yakun Dong,Xingyu Hao,Li Zhang,Xiang Chi
Currently, a growing focus is devoted to the creation and utilization of renewable resources for bio-based polyesters due to the shortage of oil resources. Since 2,5-furandicarboxylic acid (FDCA) has been described as one of the most promising platform compounds, FDCA-based polyesters have been rapidly developed. Poly(decylene terephthalate- co -decylene furandicarboxylate) (PDTFs) in this study were prepared from dimethyl terephthalate (DMT), 1,10-decanediol (DDO) and dimethyl 2,5-furandicarboxylate (DMFD). By using 1 H NMR and 13 C NMR, the polyesters' chemical structure was verified. The thermal properties and the thermal stability of the polyesters were analyzed by Differential Scanning Calorimetry (DSC) and Thermogravimetric analysis (TGA). All polyesters underwent mechanical testing to ascertain their Young's modulus , tensile strength , and elongation at break. All polymers are semi-crystalline materials. The crystal texture of PDTF24 is equivalent to that of poly(decylene terephthalate) (PDT). However, the crystal structures of PDTF48 and PDTF76 are similar to that of poly(decylene furandicarboxylate) (PDF). All polymers exhibit high thermal stability. PDF has the highest tensile strength, probably because the oxygen atom on the furan ring results in stronger intermolecular interactions . When the content of the decylene furandicarboxylate unit reaches 48%, Young's modulus reaches its lowest value (96.6 MPa), but its elongation at break reaches its highest value (1098%) due to the lowest crystallinity .
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Kui Chen,Chunhui Xie,Bangyu Zhao,Yongzhen Xu,Fangzhou Dai,Yuanlong Guo,Qinqin Xu,Haibo Xie
A zwitterionic cellulose poly(ionic liquid) additive enables electrostatic shielding and preferential adsorption to stabilize Zn anodes. • Zn||Cu half-cells deliver 99.75% average CE over 2,792 cycles at 10 mA cm -2 . • Zn||Zn symmetric cells achieve an ultralong lifespan of 3,160 h at 0.5 mA cm -2 . • Zn||NVO full cells retain 82.4% capacity after 500 cycles at 1 A g -1 and suppress vanadium dissolution. Aqueous zinc-ion batteries (AZIBs) face formidable barriers including uncontrolled dendrite growth, severe corrosion, hydrogen evolution, and inhomogeneous Zn 2+ deposition. To overcome these challenges, this work develops an innovative zwitterionic cellulose poly(ionic liquid)s (ZC-PILs) electrolyte additive leveraging the DBU/CO 2 /DMSO solvent system. The ZC-PILs synergistically combines electrostatic shielding from [Mim] + moieties and self-adsorption of −COOH groups to stabilize Zn anodes. Unprecedented electrochemical performance is demonstrated by an average CE of 99.75% over 2792 cycles for Zn||Cu cells at 10 mA cm −2 and stable operation for 3160 h for Zn||Zn symmetric cells at 0.5 mA cm −2 with a capacity of 0.5 mAh cm −2 . Interfacial and electrochemical analyses reveal preferential Zn(002) deposition, the formation of ZnS-ZnF 2 -rich SEI layers, and improved electrochemical stability of NH 4 V 4 O 10 cathodes in ZC-PILs-containing electrolytes. Consequently, Zn||NVO full cells retain 82.4% capacity after 500 cycles at 1 A g −1 with 92.94% CE and minimal self-discharge. This work demonstrates a multifunctional additive strategy for suppressing dendrite growth and improving the stability of zinc batteries. Cellulose-based zwitterionic poly(ionic liquid)s (ZC-PILs) simultaneously regulate Zn 2+ transport and the Zn/electrolyte interface through imidazolium-mediated electrostatic modulation and carboxyl-group-assisted preferential adsorption. This dual-function interfacial regulation homogenizes Zn 2+ flux, suppresses parasitic reactions and dendrite growth, and enables highly reversible, ultralong-cycling Zn anodes. Download: Download high-res image (215KB) Download: Download full-size image
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2026
·
IF 3.3
Ma Yong-hu,Ma Fu,Zhao Tiao-bin,Gao Zi-yi,La Ying-hong,Zhao Hong-jian
Limited interfacial charge separation efficiency and insufficient redox capacity severely hinder the practical application of conventional Bi 2 WO 6 -based photocatalysts. To address these issues, a novel Bi(C 2 O 4 )OH/Bi 2 WO 6 heterojunction was constructed via a facile room-temperature one-pot liquid-phase deposition method. Multiple characterizations confirm the intimate interfacial contact between Bi(C 2 O 4 )OH nanorods and uniformly anchored Bi 2 WO 6 nanoparticles, accompanied by the introduction of abundant oxygen vacancies. On the basis of radical trapping experiments, EPR measurements, and electrochemical tests, an S-scheme charge-transfer model is proposed. This model retains the strong redox potentials of both semiconductors, while oxygen vacancies are speculated to act as efficient interfacial charge-trapping and transfer sites to synergistically promote the migration and separation of photogenerated carriers. The optimized 7%Bi(C 2 O 4 )OH/Bi 2 WO 6 composite achieves an RhB removal efficiency of 97.6% within 60 min for 50 mL of RhB solution (30 mg·L -1 ) under 5-W LED lamp irradiation. Radical trapping and EPR tests confirm that ·O 2 - , h⁺, and ·OH are the dominant active species. This work presents a facile and efficient room-temperature fabrication strategy for Bi-based heterojunctions and systematically elucidates the synergistic promotion mechanism between oxygen vacancies and the proposed S-scheme charge-transfer pathway, offering new insights for designing high-performance photocatalysts for organic wastewater remediation.
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