JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Yue Liu,Chunkai Wang,Ding Ma,Mengge Li,Yuting Sun,Xiaofei Sun,Yan Zhu,Bin Yao,Yongfeng Li,Zhanhui Ding
It is proved that secondary phases, such as Cu 2 Se, and ZnSe etc., and MoSe 2 layer can form at Cu 2 ZnSn(S,Se) 4 (CZTSSe)/Mo electrode interface, due to that Mo electrode reacts with CZTSSe and Se vapor during selenization process. The secondary phases and MoSe 2 with inappropriate thickness can decrease power conversion efficiency (PCE) of CZTSSe solar cell. In this work, a simple method was proposed to suppress the reaction between CZTSSe and Mo, and to optimize the thickness of MoSe 2 . This was achieved by growing a layer of Mo oxide in situ on the Mo electrode surface through soaking the Mo electrode in H 2 O 2 . The Mo oxide layer consisted of MoO 3 , MoO x and MoO 2 . It could suppress the reaction between Mo and CZTSSe, thus preventing the formation of secondary phases in CZTSSe. By further tuning the soaking time, the thickness and density of the Mo oxide layer were optimized, resulting in an optimized thickness of the MoSe 2 layer and a significant improvement in the contact quality at both the front and back interfaces. This improvement is beneficial for suppressing carrier recombination and reducing contact resistance. Furthermore, the Cu/(Zn+Sn) ratio in CZTSSe was optimized, leading to an expansion of the depletion region width. As a result, the reverse saturation current density and series resistance decrease, while the photogenerated current density increases. This ultimately led to a rise in PCE from 7.66% for CZTSSe solar cells with Mo electrodes that were not soaked to 8.95% for those with Mo electrodes soaked for 20 s.
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Environmental Science-Nano
·
2017
·Vol. 4
·期 5
·1037-1044
·
IF 6.047
Wen-Jing Wang,Jun-Mei Xia,Xin Hai,Ming-Li Chen,Jian-Hua Wang
The nucleophilic substitution reaction between 4-chloro-7-nitro-2,1,3-benzoxadiazole (NBD-Cl) and –NH2 groups on amino-functionalized carbon dots (CDs) produces a novel carbon dot-based hybrid, CDs@NBD for short. In addition to the characteristic fluorescence emission of carbon dots at λex/λem = 360/443 nm, the CDs@NBD hybrid gives rise to new photoluminescence at λex/λem = 460/544 nm, which is significantly quenched by p-phenylenediamine (PPD) via static quenching. This provides a novel sensing approach for fluorometric detection of PPD with CDs@NBD as a probe. A linear calibration graph is obtained within two concentration ranges of 0.1–1.0 μmol L−1 and 1.0–10.0 μmol L−1, along with a detection limit of 56 nmol L−1 and a RSD of <3% (at 1.0 μmol L−1). The common coexisting species in environmental and biological sample matrices cause no obvious interferences on the detection of PPD. The colour change of the CDs@NBD hybrid solution with the variation in PPD concentration also facilitates visual detection of PPD, which further demonstrates promising applications in environmental and biological sample analysis.
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Chemical Science
·
2024
·
IF 7.6
Wei-Xing Chen,Zi-Sheng Li,Harry W. T. Morgan,Cong-Cong Shu,Zhong-Ming Sun,John E. McGrady
We report here the synthesis and characterization of two endohedral Zintl-ion clusters, [Fe4Sn18]4− and [Fe4Pb18]4−, which contain rhombic Fe4 cores. The Fe–Fe bond lengths are all below 2.5 Å, distinctly shorter than in the corresponding Cu clusters, indicating the presence of Fe–Fe bonding. Subtle differences in the structure of the Fe4 core between the two clusters suggest that the change in tetrel element causes a change in electronic ground state, with a very short Fe–Fe bond length of 2.328 Å present across the diagonal of the rhombus in the lead case.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Li Sun,Zhili Qiao,Yuan Zhi,Hua Zhang,Binlin Dou,Yuejin Shan,Weijia Huang
Bulk noble metal–semiconductor composites can be chosen as photocatalysts to carry out the flow degradation of 4-nitrophenol (4-NP) whereas their preparation is complex and uncontrollable. Here, bulk Au-Co-CoO x -CeO x @iron ball (Au/Co-CC@iron ball) is designed and prepared by a facile and controllable route without any toxic chemical. The bulk Au/Co-CC@iron ball shows excellent photocatalytic activity and reusability for the 4-NP degradation, which can be ascribed to the synergistic action of active components and foliated iron ball surface. Furthermore, the highly active Au/Co-CC@iron ball is used as packing material to construct a new-type of packed reactor, by which the flow degradation of 4-NP is successfully achieved. As-fabricated packed reactor and its tandem module exhibit superior photocatalytic performance for the flow degradation of 4-NP. Noteworthy, based on the tandem module with six reactors, the removal rate of 4-NP can reach up to 2750 µmol/h. Meanwhile, the reactor and its module display satisfactory operational stability and reusability in the flow degradation of 4-NP. Clearly, the provided route is effective for the preparation of bulk noble metal–semiconductor composites with exceptional performance, which can also be a prospective strategy to obtain bulk packing materials to serve for the flow degradation.
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DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Hongwu Gu,Wenbin Wu,Xuan-He Liu
Constructing hydrogen bonds through the heterojunction is expected be a successful tactic for achieving efficient charge separation. Here, we presented a heterojunction between 1,3,6,8-Tetra(4-carboxyphenyl) pyrene (T) and carbon nitride (CN), named T/CN. Hydrogen bonds formed between carboxyl groups of T and pyridine N in CN through the heterojunction. T/CN exhibited improved visible light absorption and enhanced charge carrier separation. The yield of CH 4 over T/CN reached up to 17.8 μmol·g −1 ·h −1 , ∼7 times higher than that of CN (2.55 μmol·g −1 ·h −1 ). This work improved the photocatalytic performance of carbon nitride by synthesizing heterojunction catalysts containing hydrogen bonds, which provided a scheme for the diversified development of heterojunction catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zhiwei Lu,Jinrong Li,Qingliang Chen,Lixiao Xu,Jie Yun,Gehong Su,Chun Wu,Xiaodan Du,Xiaohan Cao,Hanbing Rao,Yanying Wang,Mengmeng Sun
Preventing bacterial infection and accelerating wound closure are critical for wound healing. Herein, a novel multifunctional polyvinyl alcohol-polyvinylpyrrolidone (PVA-PVP) microneedle (MN) patch embedded with enzyme-like activity (Co 3 Fe)(S 2 ) 4 (CFS) nanoparticles and metal ions (Co 2+ and Fe 3+ ) was systematically synthesized for the management of bacteria-infected wounds. CFS regulated redox homeostasis and achieved bacterial eradication while concomitantly alleviating oxidative damage. Specifically, CFS generated reactive oxygen species (ROS) to eliminate bacteria and concurrently attenuated cellular inflammation by scavenging ROS through their superoxide dismutase-like (SOD) activity. Meanwhile, the results of RNA transcriptome sequencing and quantitative real-time polymerase chain reaction (qRT-PCR) analyses indicated that Co 2+ and Fe 3+ can inhibit inflammatory responses in mice by modulating the IL-17 and NF-κB signaling pathways. Therefore, CFS-ion-MN significantly enhanced the healing of wounds infected with methicillin-resistant Staphylococcus aureus ( MRSA ) in mice model without eliciting systemic toxicity. Overall, this study offers an innovative methodology for the development of composite materials for the effective treatment of wounds.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Ziming Luo,Mengqiang Tan,Jianyi Song,Jingyao Sun,Qiao Lan,Jian Liu
In this study, a continuous flow catalytic reactor based on three-dimensional porous sponge bed with the uniform distribution of catalyst to treat 4-NP wastewater efficiently. The porous sponge is used as a support to construct polyelectrolyte multilayers by loading dopamine. And the multilayer polyelectrolyte is closely bound to dopamine to form polyelectrolyte film, and the nanocatalysts are synthesized by electrostatic adsorption of precursors. The reactor realizes the uniform and stable distribution of the catalyst in the three-dimensional porous sponge, and the reactant transfers from bulk solution to catalyst surface by the way of convection and diffusion, which enhances mass transfer and further improves the reaction efficiency. Under the operating conditions of a catalytic bed as small as 3 cm, a 4-NP concentration up to 4.5 mM, and a flow rate of 300 μL min −1 , the conversion rate remained above 96 % for up to 200 h, indicating that the reactor has good catalytic efficiency. The results showed that this continuous flow catalytic system structure has excellent performance in wastewater treatment.
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POLYMER
·
2018
·
IF 3.483
Jinggang Wang,Xiaoqing Liu,Zhen Jia,Liyuan Sun,Yajie Zhang,Jin Zhu
Poly(ethylene- co -1,4-cyclohexanedimethylene 2,5-furandicarboxylate) (PECF), with different contents of trans - or cis -CHDM isomers, was synthesized to investigate the influence of CHDM configuration on its properties. Before properties investigation, their chemical structures , composition and molecular weight as well as molecular weight distribution were determined by nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC). Their thermal and dynamic mechanical properties as well as barrier properties were measured by differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA), dynamic mechanical analysis (DMA) and gas permeability tester. Results showed that the PECFs could be changed from amorphous polyester (PECF-trans 25) to highly crystalline polyester (PECF-trans 98) by increasing the content of trans -CHDM from 25% to 98%. The melting temperature of PECF-trans 98 was as high as 252 °C and its crystallization half-time was only 15 s. Besides the tensile modulus and strength, the O 2 and CO 2 barrier property of PECFs were all increased with the increasing content of trans -CHDM. When the content of trans -CHDM was higher than 55%, PECFs showed excellent gas barrier properties, which was better or comparable to those of PEN and PEI.
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RSC Advances
·
2018
·Vol. 8
·期 14
·7330-7339
·
IF 2.936
Yongjin Li,Liming Wang,Yong Gao,Weijun Yang,Yingying Li,Cancheng Guo
Novel conjugated metalloporphyrin polymers (PP-EPMn and PX-EPMn) were synthesized by the Sonogashira coupling reaction with Mn(III)5,10,15,20-tetraksi(4′-ethynylphenyl)porphyrin ([p-ethynyl]4PMn) as building block, and with phenylene and xenyl groups as bridges, respectively. Fine nanospheres were obtained through control of the reaction conditions. The two polymer nanospheres were characterized in detailed by BET, FE-SEM, HR-TEM, FT-IR, UV-Vis and XPS, revealing that they were highly ordered, highly developed microporous and super-conjugated metalloporphyrin polymers with large surface areas and uniform pore sizes. Their electrochemical behaviors and hydrophilicity were also investigated. With the synergistic effects of porous nanosphere structure and conjugated covalent structure, PP-EPMn and PX-EPMn showed excellent catalytic activity and reusability in the catalytic degradation of methylene blue (3,7-bis(dimethylamino)-5-phenothiazinium chloride) in aqueous solution. The good hydrophilicity of the polymer nanospheres promoted the catalytic degradation. In particular, unlike Fenton degradation systems that require acidic conditions, PP-EPMn degraded methylene blue significantly better under alkaline conditions, which implied a good prospect in treating industrial methylene blue dye wastewater.
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Catalysis Science & Technology
·
2018
·Vol. 8
·期 3
·735-745
·
IF 5.365
Lin Dong,Li-Li Yin,Qineng Xia,Xiaohui Liu,Xue-Qing Gong,Yanqin Wang
One-pot depolymerization of lignin to well-defined chemicals and their further deoxygenation to arenes are extremely attractive. Based on our previous results that Nb2O5 species can promote the cleavage of C–O bonds and the synergistic effect between Ru and Nb2O5 species led to the direct transformation of lignin into arenes over a Ru/Nb2O5 catalyst [Nat. Commun., 2017, 8, 161041], the importance and influence of ruthenium particle size need to be further studied. Herein, we report the different performances of Ru/NbOPO4 catalysts with various Ru particle sizes in the hydrogenolysis of a lignin model compound. This study shows that the catalytic activities and the product distributions strongly depend on the size of Ru nanoparticles (NPs): Ru NPs with smaller diameters (1.2 and 1.8 nm) have a higher activity for the cleavage of Caliphatic–O and Caromatic–O bonds, whereas Ru NPs with larger diameters (2.5 and 5.3 nm) show a much lower activity for C–O cleavage, especially for the Caromatic–O bond, resulting in totally different product distributions. Density functional theory (DFT) calculations revealed that the presence of step and edge sites in smaller Ru particles can significantly lower the barriers for both Caromatic–O and Caliphatic–O bond cleavage. This study provides a new way for catalyst design towards highly efficient and selective hydrogenolysis of lignin to useful aromatic chemicals.
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Pharmaceuticals
·
2024
·Vol. 17
·期 9
·1161
·
IF 4.3
Luge Chen,Yingwei Liu,Dawei Xu,Na Zhang,Yong Chen,Jin Yang,Lijuan Sun
With the increasing prevalence of insomnia-related diseases, the effective treatment of insomnia has become an important health research topic. Lavender (Lavandula angustifoliaMill.) essential oil (LEO) is a commonly used medicine for the treatment of insomnia and neurological disorders. However, neither the active components nor its sedative–hypnotic mechanism have been fully discovered. This study aimed to screen the main active terpenes and discover the possible mechanism of LEO through network pharmacology in the treatment of insomnia-related diseases, as well as to verify our hypothesis in insomnia mice. The results showed that, in LEO’s 15 potential active ingredients, beta-myrcene had strong sedative–hypnotic effects through the serotonergic synaptic pathway according to the network pharmacological prediction. Further, PCPA(DL-4-chlorophenylalanine)-induced insomnia mice were treated with beta-myrcene for one day or seven days. The quiet state of insomnia mice was increased effectively, and the hypnotic effect was enhanced by anaobarbital sodium by prolonging sleep duration, decreasing sleep latency, and increasing the rate of falling asleep. Beta-myrcene reduced the damage to hypothalamic neuron cells induced by PCPA and increased neurotransmitter levels of GABA, 5-HT, and Glu in the serum and hypothalamus of insomnia mice. Meanwhile, beta-myrcene exerted an improvement in insomnia by upregulating relevant genes and protein expression in the serotonergic synaptic pathway. These results support the merit of the sedative–hypnotic activity of LEO. Beta-myrcene, a terpene in LEO, may be the main source of its sedative–hypnotic properties. It may serve as a good potential compound in future clinical studies on coping with insomnia.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Tingting Li,Yukun An,Jiashuang Li,Zhiming Zhang,Lin Liu,Libao An
A bimetallic Ln-MOF nanofibrous membrane (NFM) was successfully fabricated by in situ growth of Eu/Tb-MOF crystals onto electrospun polycaprolactam (PA6) nanofibers . For better combining with PA6 nanofibers , the Eu/Tb-MOFs were made into nanocrystals . Characterization with PXRD , FT-IR, EDS and XPS confirmed that the crystal structure of the Eu/Tb-MOFs maintained well on PA6 NFM. The as-prepared Eu/Tb-MOF@PA6 NFM can be used as a colorimetric fluorescent test strip for instant detection of the volume ratio of 1, 4-dioxane in 1, 4-dioxane-glycol mixture. With the increase of 1, 4-dioxane, the test strip presented color changes from green to red, which can be easily distinguished by the naked eye. In view of this, the conversion rate of the condensation reaction of glycol to 1, 4-dioxane will be preliminarily estimated without the help of equipment. More importantly, the test strip exhibited better convenience and reversibility compared with powdered Ln-MOFs because no separation process was needed for test strip before and after recovering. Benefiting from sufficient amide groups in PA6 for anchoring Eu/Tb-MOF particles, the test strip showed satisfactory stability in cycling experiments. This work will provide a new insight into the development of fluorescent test strip based on electrospun MOF NFM for quantitatively monitoring the reaction process.
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