JOM
·
2023
·Vol. 75
·期 12
·5300-5309
·
IF 2.6
Wang Huan,Cheng Zhengzai,Djouonkep Lesly Dasilva Wandji,Lan Chupeng,Wang Linfeng,Cai Shuanpu,Ding Ling,Gauthier Mario
Petroleum-based polyesters are widely used in daily life. However, their reliance on petroleum resources and non-biodegradability have raised concerns. Due to the advantages of being renewable, degradable, and abundant, bio-based polyester is expected to become a breakthrough in replacing petroleum-based polyester. In this study, p -hydroxybenzaldehyde, a bio-based monomer, was used to synthesize a novel diol, 2,2′-(4-((4-ethylphenyl)diazenyl)phenylazanediyl)diethanol (EDPD). The EDPD was then polymerized with 1,4-cyclohexanedimethanol (CHDM) and aliphatic diacids to synthesize a series of aliphatic-aromatic polyesters. Thermal analysis showed that the T g varied from 43°C to 104°C, while the melting point ( T m ) varied from 118°C to 156°C. All the polyesters exhibited high yield strengths (48–79 MPa) and tough values (elongation at break of 240–330%). After 30 weeks of soil incubation, the mass loss of the copolyester could reach 4.3%. The investigation of the eco-toxicity of the copolyesters showed that the survival rate of Eisenia foetida was more than 80%, demonstrating their low toxicity in natural habitats. The copolyesters investigated in this study exhibited good thermal, mechanical, and biodegradability properties. The properties of the copolyesters can be adjusted by varying the length of the carbon chains of the dicarboxylic acid moieties. These bio-based copolyesters could provide an important way to promote carbon neutrality and sustainable development of bio-based plastics.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 6
·1058-1063
·
IF 3.1
Wang Chenghui,Yu Zhichao,Bai Qinghong,Pan Dingwu,Prior Timothy J.,Tao Zhu,Redshaw Carl,Xiao Xin
T he binding behavior of cucurbit[8]uril(Q[8]) and p -hydroxybenzoic acid(p-HBA) has been investigated using 1 H NMR titration experiments, UV-Vis absorption, isothermal titration calorimetry(ITC), and X-ray crystallography. Results revealed that the Q[8] can accommodate two p -HBA molecules to form a 1:2 host-guest inclusion complex in solution, namely ( p -HBA) 2 @Q[8]. From a poorly scattering crystal, we were able to identify two symmetry unique Q[8] rings, but with different p -HBA fillings. The structure can be represented as Q[8]+1.5 p -HBA, which gives Q[8]@(p-HBA) 2 ·Q[8]@ p -HBA as the structural formula. This supramolecular structure was screened for its ability to capture iodine. The experimental results showed that the adsorption efficiency of the supramolecular organic framework material for iodine capture was 43.8%, with an equilibrium adsorption capacity of 223.3 mg/g.
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ChemistrySelect
·
2022
·Vol. 7
·期 43
·e202202843
·
IF 2.307
Cheng-hui Wang,Qing Tang,Jie Zhao,Xin Xiao,Zhu Tao,Ying Huang
Graphical We have reported a stimuli-responsive supramolecular assembly of twisted cucurbit[14]uril ( t Q[14]) and p -diaminoazobenzene (DAAB). Our research results revealed that the interaction between the DAAB and t Q[14], t Q[14] affords the complex t Q[14]-DAAB. The association and dissociation of the supramolecular assembly could be reversibly controlled by the thermal. Furthermore, the t Q[14]-DAAB complex also responded to selected anionic stimuli such as AcO − and F − , and exhibiting potential analysis application. The supramolecular assembly between twisted cucurbit[14]uril ( t Q[14]) and p -diaminoazobenzene (DAAB) has been successfully developed based on host-guest interactions. Interestingly, as the temperature increases, the assembly dissociates and recovers when the temperature decreases. This shows that the association and dissociation of the supramolecular assembly can be reversibly controlled by the temperature. In addition, the t Q[14]-DAAB complex also exhibits selective ultraviolet and colorimetric responses for AcO − and F − , the detection limits of the sensor for AcO − and F − are 5.17×10 −6 M and 2.31×10 −5 M, respectively. The t Q[14]-DAAB exhibits potential analysis applications.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Yimeng Zhou,Qianjin Ye,Xiangli Shi,Qiong Zhang,Qi Song,Changjian Zhou,Di Li,Deli Jiang
Due to the multiple electron and proton transfer processes involved, the photogenerated charges are easily recombined during the photocatalytic reduction of CO2, making the generation of the eight-electron product CH4 kinetically more difficult. Herein, Ni3B nanoparticles modulated by p-block element were combined with TiO2 nanosheets to construct a novel Schottky junction photocatalyst (Ni3B/TiO2) for the selective photocatalytic conversion of CO2 to CH4. The formed Ni3B/TiO2 photocatalyst with Schottky junction ensures a transfer pathway of photogenerated electrons from TiO2 to Ni3B, which facilitates the accumulation of electrons on the surface of Ni3B and subsequently improves the activity of photocatalytic CO2 reduction to CH4. The optimized Ni3B/TiO2 Schottky junction shows an improved CH4 yield of 30.03 μmol g–1 h–1, which was much higher than those of TiO2 (1.62 μmol g–1 h–1), NiO/TiO2 (2.44 μmol g–1 h–1), and Ni/TiO2 (4.3 μmol g–1 h–1). This work demonstrated that the introduction of p-block elements can alleviate the scaling relationship effect of pure metal cocatalysts to a certain extent, and the modified Ni3B can be used as a promising new cocatalyst to effectively improve the selective photocatalytic of CO2 to CH4.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Hao Zhao,Baoyin Xu,Zhanhui Ding,Yanfeng Xue,Jing Yang,Wei Zhao,Yongfeng Li,Bin Yao,Hongdong Li,Yucheng Lan
Bismuth telluride is a widely used commercial thermoelectric material with excellent thermoelectric performances near room temperature. Reducing thermal conductivity is one of the most effective ways to improve performances of thermoelectric materials. In this study, the thermal conductivity of the material was reduced by fabricating porous structures. Highly dense NaCl-(Bi,Sb) 2 Te 3 composites were fabricated by a high-pressure technology. The NaCl phase was then removed from the composites by ultrasonic washing to produce porous structures. The produced (Bi,Sb) 2 Te 3 porous materials possessed excellent thermoelectric properties. The porosity and pore size of the (Bi,Sb) 2 Te 3 porous materials increased with the increasing NaCl content, decreasing the thermal conductivity significantly. An ultra-low lattice thermal conductivity of 0.21 Wm −1 K −1 at 493 K was achieved when the porosity was 39%, almost the lowest lattice thermal conductivity reported for (Bi,Sb) 2 Te 3 bulk materials. The figure of merit ZT value was enhanced to 1.05 at 493 K when the porosity was 25%. Compared with the most compacted samples ( ZT = 0.79 and porosity of 10%) prepared under the same conditions, the ZT value of the porous samples increased by 33%. This study indicated that porous thermoelectric materials can be prepared simply, quickly and efficiently by high-pressure/ultrasonication washing to improve thermoelectric performances, which has evident reference values for preparing other thermoelectric pore materials with enhancing behaviors.
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Catalysis Science & Technology
·
2022
·Vol. 12
·期 15
·4893-4902
·
IF 6.177
Keting Feng,Tao Sun,Xiaoyun Hu,Jun Fan,Dongyuan Yang,Enzhou Liu
Photocatalytic H2 evolution is a promising way to obtain green H2 due to its clean and sustainable characteristics. Herein, a series of 0D/2D Co0.85Se/TiO2 heterojunctions were fabricated through a successive two-step hydrothermal strategy. Among them, 15%-Co0.85Se/TiO2 displays the most excellent H2 rate of 2312.5 μmol g−1 h−1, which is 10.3 times and 10.8 times higher than that of TiO2 and Co0.85Se, respectively. And the H2 production rate per electrochemically active surface area of 15%-Co0.85Se/TiO2 is 127.41, which is obviously more than that of TiO2 (14.17) and Co0.85Se (5.39). Based on the core-level alignment method and free radical capture tests, the enhanced activity mainly resulted from the higher electrochemically active surface area and the formation of a p–n heterostructure between TiO2 and Co0.85Se. This research provides a strategy for the development of noble metal-free nanocomposites for efficient photocatalytic H2 production.
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Chemistry-An Asian Journal
·
2022
·Vol. 17
·期 16
·e202200476
·
IF 4.839
Kaiqi Zhang,Hongyan Song,Zhe An,Jian Zhang,Yanru Zhu,Zhigang Chai,Xin Shu,Jing He
Graphical NiFe- LDHs/P-TCN heterojunction has been constructed with P-dopant defects and interface synergy. Moreover, Its mesoscale mechanism was elucidated among different constituent interfaces. The semiconductor based photocatalysis has become a hot spot of current research, and the key challenges are the construction of strong functional heterojunction photocatalysts, and insights on the working mechanism involved. In this work, we constructed a NiFe- LDHs/P-TCN heterojunction with P-dopant defects and interface synergy and elucidated its mesoscale mechanism among different constituent interfaces. The interface photoelectron transfer was detected by PAS, EPR and other methods, and the enhancing mechanism of the defect sites for interface electron transfer and photocatalytic activity was proposed. The interfacial electrons, photoelectric properties and photocatalytic activity are found to be positively correlated. The result is conducive for a better understanding on working mechanism of heterogeneous photocatalysts, which opened a broader research space for the rational design and construction of functional interfaces.
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ChemNanoMat
·
2022
·Vol. 8
·期 8
·e202200113
·
IF 3.82
Minglong Xia,Mengjie Yang,Yuchao Guo,Xi Sun,Shuo Wang,Yi Feng,Huili Ding
Graphical The CoFe−P/Ti 3 C 2 T x nanosheets have been synthesized via reflux hydrothermal and phosphorization. The obtained CoFe−P/Ti 3 C 2 T x is an excellent OER catalyst, and its performance exceeds that of the noble metal catalyst RuO 2 . Oxygen evolution reaction (OER) is a crucial step in many sustainable energy technologies. Exploring cost-effetive electrocatalysts with high efficiency is one of the most critical but challenging problems to overcome the slow reaction rate and high overpotential in OER. Layered double hydroxide (LDH) has excellent OER performance. However, their poor electrical conductivity and easy agglomeration limit their use. Currently, further phosphorizaton or incorporating with conductive substrates is an effective method to improve the OER performance. In this study, a hybrid product denoted as CoFe−P/Ti 3 C 2 T x were successfully prepared by facile reflux hydrothermal and phosphorization. The optimized CoFe−P/Ti 3 C 2 T x possesses a low overpotential of 270 mV at a current density of 10 mA cm −2 and a small Tafel slope (57.7 mV dec −1 ). In addition, an overpotential of 337 mV was needed for affording 50 mA cm −2 in the 1 M KOH.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Ying Wang,Changhai Liu,Park Yoon-Yul,Atarashi Hiroshi,Tomiyasu Hiroshi,Wenchang Wang,Zhidong Chen
By incorporating the advantages of different materials, the composite material can Preferably strengthen the electrochemical performance of the electrode material. In this paper, CQDs/P-Fe 2 O 3 on carbon cloth (CC) as flexible electrode material was synthesized with one-pot hydrothermal synthesis procedure. The one-dimentional (1D) structure was favorable due to the chemical stability, electrical conductivity, and fast electrochemical kinetics. While the current density is 0.5 A/g, the specific capacitance of the composite reaches 1786.5 F/g. The assembled supercapacitor remains at 91.31% of its initial specific capacitance after 1000 cycles. When the power density is 639.99 W/kg, the energy density is 103.11Wh/kg, and even when the power density is 12800 W/kg, the energy density can reach 44.8 Wh/kg.
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JOURNAL OF ETHNOPHARMACOLOGY
·
2022
·
IF 5.195
Haihua Shang,Yinghui Sun,Ze Wang,Ying Zhou,Huajiao Yang,Xiaoyan Ci,Tao Cui,Yuanyuan Xia,Yuan Gu,Maoliang Liao,Quansheng Li,Duanyun Si,Changxiao Liu
Ethnopharmacological relevance Ilicis Rotundae Cortex (IRC), the dried barks of Ilex rotunda Thunb. (Aquifoliaceae), has been used for the prevention or treatment of colds, tonsillitis , dysentery , and gastrointestinal diseases in folk medicine due to its antibacterial and anti-inflammatory effects. However, there is no report about the intestinal absorption of major compounds that support traditional usage. Aim of study Considering the potential of rotundic acid (RA) – major biologically active pentacyclic triterpenes found in the IRC, this study was purposed to uncover the oral absorption mechanism of RA using in situ single-pass intestinal perfusion (SPIP) model, in vitro cell models (Caco-2, MDCKII-WT, MDCKII-MDR1, MDCKII-BCRP, and HEK293-OATP2B1 cells) and in vivo pharmacokinetics studies in rats. Materials and methods The molecular properties (solubility, lipophilicity , and chemical stability) and the effects of principal parameters (time, compound concentrations, pH, paracellular pathway, and the different intestinal segments) were analyzed by liquid chromatography-tandem mass spectrometry. The susceptibility of RA to various inhibitors, such as P-gp inhibitor verapamil , BCRP inhibitor Ko143 , OATP 2B1 inhibitor rifampicin , and absorption enhancer EGTA were assessed. Results RA was a compound with low water solubility (12.89 μg/mL) and strong lipophilicity (LogP = 4.1). RA was considered stable in all media during the SPIP and transport studies. The SPIP and cell experiments showed RA was moderate absorbed in the intestines and exhibited time, concentration, pH, and segment-dependent permeability. In addition, results from the cell model, in situ SPIP model as well as the in vivo pharmacokinetics studies consistently showed that verapamil, rifampicin, and EGTA might have significant effect on the intestinal absorption of RA. Conclusion The mechanisms of intestinal absorption of RA might involve multiple transport pathways, including passive diffusion, the participation of efflux (i.e., P-gp) and influx (i.e., OATP2B1) transporters, and paracellular pathways.
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Journal of Energy Storage
·
2023
·
IF 9.4
Xing Chen,Haijun Tao,Yinhua Jiang,Shishi Li,Yuxin Liu,Kun Xie,Yuqiao Wang
P-doped S vacancy-rich NiCo 2 S 4 hollow microspheres (P-NiCo 2 S 4-x HMSs) were prepared by hydrothermal, sulfuration, and phosphorization methods. P doping and S vacancy dual defects can be simultaneously obtained during the phosphorization process. The dual defects can modulate the electron structure and create abundant electrochemical sites, boosting electron transfer and reaction kinetics. Theoretical calculations illustrated that the dual defects could reduce the adsorption energy of OH − and Mulliken charges of Ni atoms, in favor of OH − adsorption. The hollow construction can increase the specific surface area, promote ion diffusion, and alleviate the volume variation during charge/discharge processes. The specific capacity and rate capability of the P-NiCo 2 S 4-x HMSs electrode can reach up to 1146.0 C g −1 at 1 A g −1 and 61.8 % at 30 A g −1 , respectively. The P-NiCo 2 S 4-x HMSs electrode exhibited remarkable cycling stability with a 79.5 % capacity retention after 20,000 consecutive charge/discharge cycles. The assembled P-NiCo 2 S 4-x //AC hybrid supercapacitor manifested an infusive energy density of 62.7 Wh kg −1 at 867 W kg −1 .
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MOLECULES
·
2023
·Vol. 28
·期 21
·7396
·
IF 4.6
Huihui Chen,Mei Yang,Yuan Liu,Jun Yue,Guangwen Chen
The design and fabrication of nanomaterials with controllable morphology and size is of critical importance to achieve excellent catalytic performance in heterogeneous catalysis. In this work, cobalt oxide (Co3O4) nanostructures with different morphologies (nanoplates, microflowers, nanorods and nanocubes) were successfully constructed in order to establish the morphology–property–performance relationship of the catalysts. The morphology and structure of the nanostructured Co3O4were characterized by various techniques, and the catalytic performance of the as-prepared nanostructures was studied by monitoring the reduction of p-nitrophenol to p-aminophenol in the presence of excess NaBH4. The catalytic performance was found to be strongly dependent on their morphologies. The experimental results show that the pseudo-first-order reaction rate constants for Co3O4nanostructures with various shapes are, respectively, 1.49 min−1(nanoplates), 1.40 min−1(microflowers), 0.78 min−1(nanorods) and 0.23 min−1(nanocubes). The Co3O4nanoplates exhibited the highest catalytic activity among the four nanostructures, due to their largest specific surface area, relatively high total pore volume, best redox properties and abundance of defect sites. The established correlation between morphology, property and catalytic performance in this work will offer valuable insight into the design and application of nanostructured Co3O4as a potential non-noble metal catalyst for p-nitrophenol reduction.
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