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Yuzhong Lu; Yanqi Sun
Kybernetes, 2024 53 (1) - EI SCIE

摘要 : Purpose This study examined the influence of corporate governance (CG) in relation to venture capital (VC) investment on invested firm's corporate social responsibility (CSR) performance in the Chinese context. More specifically, this paper examined the mediation of the proportion of independent directors (INDD), management shareholding (MSH) and executives' political connections (POLC) in the above-mentioned relationship. Design/methodology/approach This empirical study performed multiple mediation testing and bootstrap mediation robustness test on data from Chinese A-class shares IPO companies between 2010 and 2018. Findings The results of direct relationship analysis showed that VC support is detrimental to firm' CSR performance, consistent with previous research studies. The indirect effect analysis showed that VC reduced firm' CSR through reduction of INDD on board and increased MSH. Conversely, VC contributed to firm's CSR through higher POLC, which confirmed the significance of the joint mediation model. Practical implications This study offers stakeholders the opportunity to develop a deeper understanding of the role of VC institutions, independent directors and executives, in terms of firm's CSR, as well as provides insights on control rights allocation and policy drafting on independent directors when considering accessing VC support. Originality/value By analyzing the mediation model of the VC–CSR relationship, this paper provides evidence to enrich the debate on the role of CG in the relation between VC and firm's CSR.

Qianmin Fan; Zhaochao Yan; Jiangshan Li; Xianqiang Xiong; Kai Li; Guoliang Dai
Applied Surface Science, 2024 663 - EI SCIE

摘要 : Manipulating charge transfer pathways in Type-I heterojunctions is essential to address the mismatched energy bands and the often-neglected internal electric field (IEF). This study reports the successful engineering of a Type-I FeIn 2 S 4 @ZnIn 2 S 4 heterojunction exhibiting an ohmic-like charge transfer mechanism, driven by the IEF arising from considerable Fermi level differences. The ohmic-like Type-I junction facilitates efficient electron transfer from ZnIn 2 S 4 to FeIn 2 S 4 and preserves the oxidizing holes in ZnIn 2 S 4 for effective scavenger oxidation. This unique feature prevents the inefficient charge separation commonly observed in conventional Type-I heterojunctions. Due to the advantageous ohmic-like electron transfer, an optimized composition of FeIn 2 S 4 @ZnIn 2 S 4 with a weight percentage of 10 % FeIn 2 S 4 achieves a notable hydrogen evolution rate of 4.21 mmol g -1 h −1, six times higher than isolated ZnIn 2 S 4 . Furthermore, the validation of the ohmic-like charge transfer mechanism is supported by theoretical analyses and advanced characterization techniques, including in-situ X-ray photoelectron spectroscopy (XPS), Kelvin probe force microscopy (KPFM), and surface photovoltage (SPV) measurements. This present study introduces a pioneering prototype that shows the successful incorporation of the desired charge transfer pathway in a Type-I heterojunction through the implementation of an IEF regulation strategy.

Bo Qin; Bin Wang; Jiang Li; Tao Wang; Xiaoyi Xu; Li'an Hou
Separation and Purification Technology, 2024 342 - EI SCIE

摘要 : Non-radical catalytic oxidation processes can eliminate refractory pollutants from wastewater containing complex substrates such as dissolved organic matter, but the production of selective non-radicals is challenging during the activation of peroxymonosulfate (PMS). Herein, a novel magnetic carbon-based catalyst (Fe 3 O 4 @CD-8, where 8 represents an annealing temperature of 800 °C) with N and Fe species as catalytic active sites was fabricated to remediate sulfamethoxazole (SMX)-containing water. It showed excellent SMX removal efficiency and facilitated singlet oxygen ( 1 O 2 ) production. The characterization results revealed that Fe 3 O 4 @CD-8 had a microscopically hierarchical pore structure and an overall core–shell-like structure. Due to its large specific surface area, N-containing species, and Fe nanoparticles, 0.1 g/L Fe 3 O 4 @CD-8 removed almost 100% SMX (24 min) and achieved a 44.1% mineralization (40 min) efficiency in the presence of 0.5 mM PMS. This catalytic system also maintained its removal performance in the presence of inorganic anions and humic acids and over a wide pH range of 3–11, showing good tolerance to various environmental factors. 1 O 2 was confirmed to be the predominant active species for SMX degradation using the Fe 3 O 4 @CD-8/PMS system. Density functional theory (DFT) calculations, intermediate monitoring, and toxicity evaluation demonstrated that SMX was transformed into low-toxicity molecules and completely mineralized into CO 2 and H 2 O. The addition of Fe nanoparticles enhanced PMS adsorption and facilitated the Fe(III)/Fe(II) redox cycle to accelerate the activation of PMS. This study provides new insights and strategies for the controlled production of non-radicals for remediating antibiotic-containing wastewater.

Qiulin Li; Yajing Cui; Yuxin Xiao; Zhexuan Ni; Shanrong Dai; Feng Chen
Talanta, 2024 275 - EI SCIE

摘要 : Three-dimensional sponge-architecture covalent organic frameworks (COFs)-aerogel was successfully designed and synthesized via a freeze-drying template approach, and utilized as an efficient sorbent in solid-phase extraction (SPE). A method for selective enrichment of pharmaceutical contaminants including tetracycline, chlortetracycline, methacycline and oxytetracycline in the environment and food samples was proposed by combining with high performance liquid chromatography (HPLC). To understand the adsorption mechanism, selectivity test and molecular dynamics (MD) simulated calculation were both carried out. The experimental and in-silico results demonstrated that the COFs-aerogel possessed high selectivity for contaminants with H bond acceptors/donors and good efficiency with maximum adsorption capacity up to 294.1 mg/g. The SPE-based HPLC method worked well in the range of 8–1000 ng/mL, with the need of little dose of adsorbent and sample volume while no need of spectrometer, outgoing the reported adsorbents. Under the optimized conditions, the intra-day and inter-day relative standard deviations (RSD) of repeatability were within 2.78–6.29 % and 2.44–8.42 % (n = 5). The results meet the current detection requirement for practical applications, and could be extended for further design of promising adsorbents.

Rubei Hu; Yiming Chen; Chunmei Zhang; Shaohua Jiang; Haoqing Hou; Gaigai Duan
Progress in Materials Science, 2024 144 - EI SCIE

摘要 : High-performance porous polyimide (PI) monoliths, including PI aerogels, sponges, and foams, have become one of the hotspots in both researching and applications due to their superior properties such as high porosity, outstanding mechanical and thermal stability, low dielectric constant and thermal conductivity. Up to now, various fabricating methods and applicating situations for PI porous monolith materials have been reported. From the viewpoint of molecular chemistry, porous structure construction, as well as the functional modification, the property optimization and adjustment are feasible, endowing PI monoliths with promising potential for different practical applications ( e.g. sensors, low-k materials, thermal management, energy field and utilization, absorption and filtration, photonic utilization, etc.). In this review, the recent progress of porous PI monoliths was summarized in detail based on the fabrication methods, functional modifications, as well as multi-functional applications. Besides, the future perspectives of this field were also provided for reference. Apart from presenting an overview of progress made in the field of PI porous monoliths, this review could also be meaningful for those researching topics which have similarity within.

Wenting Li; Mengdi Chen; Ganwei Zhang; Weicai Chen; Lei Zhang; Shusu Shen
Desalination, 2024 582 - EI SCIE

摘要 : The DCMD technology for wastewater treatment is very promising. However, it is easily suffered by membrane fouling and wetting. In this study, a Janus membrane was fabricated by coating polyvinylamine (PVAM) and gallic acid (GA) onto one side of a PVDF composite membrane, which another side is covered with POTS-SiO 2 . The PVAM and GA side could bind water to form a hydration layer, thus repel the contaminants. The POTS-SiO 2 side was superhydrophobicity and prevented the membrane wetting. Finally, The Janus membrane presented exceptional performance in separating salt containing emulsified oil by DCMD. It kept a stable flux of 17.0 ± 0.2 Kg·m −2 ·h −1 and a low level conductivity of 0.60 ± 0.02 μS/cm in the cold side during the 36 h DCMD procedure, compared with the pristine PVDF membrane and the PVDF/POTS-SiO 2 membrane. The results presented simultaneously antifouling and antiwetting properties of the Janus membrane. While the Janus membrane can be well used in desalination of emulsified oil containing salt, it has a great potential for application to treat other complex wastewater.

Zhen Fang; Jiani Hu; Meng-Yuan Xu; Shan-Wei Li; Chunmei Li; Xiangtong Zhou
Bioelectrochemistry, 2024 158 - EI SCIE

摘要 : Bidirectional electron transfer is about that exoelectrogens produce bioelectricity via extracellular electron transfer at anode and drive cytoplasmic biochemical reactions via extracellular electron uptake at cathode. The key factor to determine above bioelectrochemical performances is the electron transfer efficiency under biocompatible abiotic/biotic interface. Here, a graphene/polyaniline (GO/PANI) nanocomposite electrode specially interfacing exoelectrogens ( Shewanella loihica ) and augmenting bidirectional electron transfer was conducted by in-situ electrochemical modification on carbon paper (CP). Impressively, the GO/PANI@CP electrode tremendously improved the performance of exoelectrogens at anode for wastewater treatment and bioelectricity generation (about 54 folds increase of power density compared to blank CP electrode). The bacteria on electrode surface not only showed fast electron release but also exhibited high electricity density of extracellular electron uptake through the proposed direct electron transfer pathway. Thus, the cathode applications of microbial electrosynthesis and bio-denitrification were developed via GO/PANI@CP electrode, which assisted the close contact between microbial outer-membrane cytochromes and nanocomposite electrode for efficient nitrate removal (0.333 mM/h). Overall, nanocomposite modified electrode with biocompatible interfaces has great potential to enhance bioelectrochemical reactions with exoelectrogens.

Ming Li; Youxin Qiu; Guoxing Liu; Yu Xiao; Ye Tian; Song Fang
Food Chemistry, 2024 448 - EI SCIE

摘要 : G-quadruplexes (G4) have received significant attention in the field of aptasensors owing to their unique physicochemical characteristics. A dual-mode, protein-free and label-free aptamer sensor based on plasmonic colorimetry and G4 fluorescence (PC@GF-aptasensor) was proposed for ochratoxin A (OTA). Colorimetry mode was achieved through the surface plasmon resonance (SPR) effect, which related to the OTA-Apt-based G4–OTA. The fluorescence mode was reflected by the insertion of thioflavin T (ThT) into G4–OTA. The OTA could be interpreted via three readouts: (1) naked eye (LOD of 2.0 ng mL −1 ), (2) smartphone (LOD of 1.65 ng mL −1 ), and (3) spectrofluorometer (LOD of 0.93 ng mL −1 ). The PC@GF-aptasensor exhibited several advantages, such as a standardised recognition group, simplified operation, low background signal, and practicality. The proposed PC@GF-aptasensor integrated SPR-based multicolour interpretation and ThT-inserted fluorescence reflection to obtain a dual-mode optical biosensor, which may provide valuable insights for the development of other targets with G4-based aptamers.

Yuxiang Tang; Yake Yuan; Yuxue Mo; Haotian Tang; Mianze Wei; Haiqing Zhou
Materials Today Physics, 2024 46 - EI SCIE

摘要 : Lithium-sulfur (Li–S) batteries with high theoretical specific capacity of 1675 mAh g −1 and energy density of 2600 Wh kg −1 are considered as a promising candidate for energy conversion and storage devices in future. However, some critical dilemmas such as low real energy density, high solubility of ether-based electrolytes and slow redox kinetics of long-chain polysulfides remain unsettled hindering their development. Here we design and propose a high-performance sulfur host material constructed by growing CoN/Co 9 S 8 nanoparticles enclosed in reduced graphene oxide (RGO) and Co 9 S 8 modified separator to enhance the electrochemical performance of Li–S batteries. The results of first principal calculations confirm that the calculated adsorption energies of Li 2 S 8, Li 2 S 6, Li 2 S 4 and Li 2 S 2 on the Co 9 S 8 (111) surface are lower than that of the CoN (111) surface, indicating that the Co 9 S 8 has stronger adsorbing effect with polysulfides. Furthermore, the catalytic effect in Li 2 S 6 symmetric batteries and the nucleation of the Li 2 S tests display that the CoN/Co 9 S 8 @RGO has a fast conversion reaction kinetics and catalytic effect of polysulfides, thereby inhibiting the leakage of the polysulfides. Consequently, the S@CoN/Co 9 S 8 @RGO cathode with Co 9 S 8 layer represents a high discharge capacity of 1367.7 mAh g −1 at 0.1C and a prolonged lifespan over 700 cycles at 1 C with an extremely low decay rate of 0.06 % per cycle and high cycling stability.

Xuejian Yao; Xingchi Lu; Quansheng Jiang; Yehu Shen; Fengyu Xu; Qixin Zhu
Advanced Engineering Informatics, 2024 61 - EI SCIE

摘要 : Real industrial scenarios struggle with the issues of a limited number of labeled samples and difficulty in accessing, which results in deep learning-based fault diagnosis models having poor generalization capabilities and decreased diagnostic accuracy. To address this problem, a semi-supervised prototype enhancement network (SSPENet) is proposed for rolling bearing fault diagnosis in this study. Firstly, a dual pooling attention residual network is proposed to be used in the feature extraction module. The goal is to efficiently extract the hidden features within rolling bearings, thus enabling the accurate classification of different sample categories. Subsequently, the Hungarian algorithm is utilized to design a strategic approach to update prototypes with pseudo-labels, which achieves the effect of augmenting prototypes by accurately adjusting the prototype position of each class of limited labeled samples through unlabeled samples, to improve the discriminative ability of the network model for fault classes. Finally, validation and experimental analysis are carried out on two bearing datasets, which achieve the average diagnostic accuracy of the proposed model to be above 90 % for both 1-shot and 2-shot cases, obtaining more satisfactory diagnostic results.