摘要：
In this work, the effect of Bi/Ag double quantum dots on plasmon resonance and PMS activation was investi-gated. Bi/Ag double quantum dots were generated in situ on hollow Bi2MoO6 microspheres by stepwise irra-diation using a high-energy & beta; electron beam. The formation of Bi/Ag DQDs greatly optimized the drawbacks of Bi2MoO6 in terms of light absorption. Synergistic introduction of DQDs greatly reduced the band gap from 2.72 eV to 2.12 eV. The Bi-Ag@Bi2MoO6 -400/PMS system degraded ciprofloxacin with kinetic constants 10 and 12 times higher than those of the Bi@Bi2MoO6/PMS and Bi2MoO6/PMS systems. The formation of an electron transfer path from Ag QDs to Bi QDs enhanced the SPR effect of Bi QDs.& BULL;O2- and 1O2 played a major role in the CIP degradation process. This study will provide a new strategy for enhancing the Bi plasmon resonance effect and provide a technical method to the efficient degradation of antibiotics in water.
摘要：
Bird diversity plays an important role in ecological balance, and bird song identification is of great practical significance. The spectrum generated by feature extraction shows good performance on classification. However, the information extracted by the filter in the process of spectrogram generation can cause information loss, which limits the learning ability of birdsong recognition. This study proposes a feature fusion network (MFF-ScSEnet) to solve this problem. The audios of the birdsong extracted the Mel-spectrogram with low-frequency feature advantage by the Mel-filter, and the Sinc-spectrogram with timbral feature advantage by the Sincnet-filter, respectively, and perform the early fusion strategy. The ScSEnet attention module is introduced into the backbone network ResNet18 to enhance the sound ripple information of the spectrogram, reduce the influence of spectrogram noise information on the recognition and improve the recognition performance of the network. Based on the feature fusion network MFF-ScSEnet in this paper, the accuracy of the experimental results on the self-built birdsong dataset (Huabei_dataset), the public datasets of Urbansound8K and Birdsdata reached 96.28%, 98.34%, and 96.66%, respectively. The results indicated that the method proposed in this paper is superior to the recent and latest birdsong recognition method.
期刊：
JOURNAL OF ORGANIC CHEMISTRY,2023年88(23):16196-16215 ISSN：0022-3263
通讯作者：
Xiong, BQ;Xiong, Biquan;Wong, WY;Yin, SF
作者机构：
[Liu, Yu; Tang, Ke-Wen; Xu, Weifeng; Shang, Wenli; Xiong, Biquan; Zhu, Longzhi] Hunan Inst Sci & Technol, Dept Chem & Chem Engn, Yueyang 414006, Peoples R China.;[Li, Zikang; Wong, Wai-Yeung; Xiong, Biquan] Hong Kong Polytech Univ, Dept Appl Biol & Chem Technol, Hung Hom, Hong Kong 999077, Peoples R China.;[Li, Zikang; Wong, Wai-Yeung; Xiong, Biquan] Hong Kong Polytech Univ, Res Inst Smart Energy, Hung Hom, Hong Kong 999077, Peoples R China.;[Qian, Peng-Cheng] Wenzhou Univ, Inst New Mat & Ind Technol, Coll Chem & Mat Engn, Key Lab Environm Funct Mat Technol & Applicat Wenz, Wenzhou 325035, Peoples R China.;[Yin, Shuang-Feng; Yin, SF] Hunan Univ, Coll Chem & Chem Engn, Adv Catalyt Engn Res Ctr, Minist Educ,State Key Lab Chemo Biosensing & Chemo, Changsha 410082, Peoples R China.
通讯机构：
[Xiong, BQ; Xiong, BQ ; Wong, WY ; Yin, SF ] H;Hunan Inst Sci & Technol, Dept Chem & Chem Engn, Yueyang 414006, Peoples R China.;Hong Kong Polytech Univ, Dept Appl Biol & Chem Technol, Hung Hom, Hong Kong 999077, Peoples R China.;Hong Kong Polytech Univ, Res Inst Smart Energy, Hung Hom, Hong Kong 999077, Peoples R China.;Hunan Univ, Coll Chem & Chem Engn, Adv Catalyt Engn Res Ctr, Minist Educ,State Key Lab Chemo Biosensing & Chemo, Changsha 410082, Peoples R China.
摘要：
A simple and efficient method for the ruthenium-catalyzed 1,6-hydroalkylation of para-quinone methides (p-QMs) with ketones via the in situ activation of C(sp(3))-H bonds has been disclosed. Without the need for preactivation of the substrates and oxidant, a broad range of p-QMs and ketones are well tolerated, producing the expected 1,6-hydroalkylation products with moderate to good yields. Step-by-step control experiments and DFT calculation were conducted systematically to gain insights for the plausible reaction mechanism. This finding may have potential application in the selective diarylmethylation of ketones at the α-C position in organic synthesis.
摘要：
Eu3+-doped Ca2InTaO6 phosphors were synthesized by a high-temperature solid-state reaction. Their crystal structure, composition, phase purity, photoluminescence (PL) properties, and thermal quenching me-chanism were investigated in this experiment. The band gap of Ca2InTaO6 (3.87 eV) classifies it as an in-direct band gap material. X-ray diffraction results confirm the good phase purity of the synthesized material has good phase purity. The Ca2InTaO6 lattice has an orthorhombic structure, which includes the Pnma(No. 62) space group. After being excited at 395 nm, Ca2InTaO6:0.40Eu3+ phosphor showed a red emission peak at 613 nm (5D0 -> 7F2 transition). The optimal doping concentration of Ca2InTaO6:xEu3+ phosphor is x = 0.40. Moreover, Ca2InTaO6:0.40Eu3+ phosphor has a color purity of 99.9%, an internal quantum efficiency (IQE) of up to 90.69% and a thermal activation energy (Ea) of 0.36 eV. The prepared white light-emitting diode (w -LED) possesses satisfactory color rendering index (Ra = 88.3), correlation color temperature (CCT = 5748 K), and Commission International de L ' Eclairage (CIE) coordinates (0.327, 0.339). The levelsI-III characteristics of the latent fingerprint (LFP) created by Ca2InTaO6:Eu3+ phosphor can also be clearly reflected. These ex-perimental results show that Ca2InTaO6:Eu3+ phosphor can be applied in w-LED production and LFP de-tection.(c) 2023 Elsevier B.V. All rights reserved.
期刊：
Process Safety and Environmental Protection,2023年173:452-460 ISSN：0957-5820
通讯作者：
Tao Xu
作者机构：
[Zhang, Xueyuan; Ou, Jinhua; Xu, Tao; Yu, Gang; Zhou, Tengfei] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Peoples R China.;[Ou, Jinhua; Hu, Bonian] Hunan Inst Technol, Sch Mat Sci & Engn, Hengyang 421008, Peoples R China.;[Xu, Tao] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;[Zhou, Yihui; Lei, Xiping] Aerosp Kaitian Environm Technol Co Ltd, Changsha 410100, Peoples R China.
通讯机构：
[Tao Xu] C;College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China<&wdkj&>College of Science, Central South University of Forestry and Technology, Changsha 410004, China
摘要：
A novel process and method for treating ciprofloxacin (CIP) antibiotic wastewater using pulsed electrooxidation at boron-doped diamond (BDD) electrodes have been developed to address the issues of low efficiency and high energy consumption associated with traditional electrochemical oxidation methods. The effects of pulsed direct current (PDC), pulsed alternating current (PAC), and direct current (DC) on chemical oxygen demand (COD) removal were studied. It was found that complete degradation of CIP could be achieved within 45 min using PAC. COD removal reached 92.4% after 90 min of PAC electrooxidation for 90 mg center dot dm(-3) CIP wastewater under optimized conditions of current density (j) = 30 mA center dot cm(-2) , initial pH (pH(0)) = 3, sodium sulfate concentration (c(Na2SO4)) = 50 mmol center dot dm(-3), and frequency (f) = 100 Hz. The electrical energy consumption (EEC) was found to be 35 W center dot h center dot dm(-3). The CIP degradation followed a quasi-first order kinetic law. The degradation pathway was found to involve hydroxylation of the quinolone moiety, cleavage of the piperazine ring, and fluorine substitution (OH/F substitution). The results showed that PAC electrochemical oxidation at all-BDD electrodes exhibited the highest removal efficiency and lowest EEC for CIP removal. This study provides a novel and effective approach for the efficient treatment of CIP antibiotic wastewater using bidirectional pulse current at all-BDD electrodes.
期刊：
Biosensors and Bioelectronics,2023年222:114981 ISSN：0956-5663
通讯作者：
Xie, Lianwu;Shi, SY;Guo, Y
作者机构：
[Shi, SY; Shi, Shuyun; Xie, Lianwu; Peng, Yuqing; Tong, Xia] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.;[Shi, Shuyun; Wang, Tongtao; Zhu, Yongfeng; Tong, Chaoying; Tong, Xia; Cai, Guihan] Cent South Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;[Tong, Xia] Shanxi Med Univ, Shanxi Acad Med Sci, Hosp 3, Shanxi Bethune Hosp, Taiyuan 030032, Shanxi, Peoples R China.;[Guo, Ying; Guo, Y] Cent South Univ, Xiangya Hosp, Dept Clin Pharmacol, Hunan Key Lab Pharmacogenet, Changsha 410078, Hunan, Peoples R China.
通讯机构：
[Shi, SY ; Xie, LW; Guo, Y ] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Hunan, Peoples R China.;Cent South Univ, Xiangya Hosp, Dept Clin Pharmacol, Hunan Key Lab Pharmacogenet, Changsha 410078, Hunan, Peoples R China.
关键词：
Background-free analysis;Organophosphorus pesticide;Ratiometric fluorescent system;Threaded 3D microfluidic paper device;Visual detection
摘要：
With the increasing concerns of food safety and environmental protection, it is desirable to develop reliable, effective, and portable sensors for detection of organophosphorus pesticides (OPs). Here, a cascade reaction system integrated with threaded 3D microfluidic paper analytical device (3D μPAD) was firstly developed for background-free and visual detection of OPs in agricultural samples. Butyrylcholinesterase (BChE) hydrolyzed acetylcholine into thiocholine (TCh), which reduced MnO(2) nanosheets into Mn(2+). With addition of OPs, BChE activity was irreversibly inhibited, and the generation of TCh and the reduction of MnO(2) nanosheets were prevented. Then the remaining MnO(2) nanosheets oxidized o-phenylenediamine into 2,3-diaminophenazine with yellow-emission fluorescence, which quenched the fluorescence intensity of red-emission carbon dots (RCDs) via inner-filter effect. Based on above mechanism, a ratiometric fluorescent system was established for OPs detection. Threaded 3D μPAD consisted of 4 layers, which allowed to load and/or add reagents to trigger the cascade reaction system for OPs detection. The fluorescent images presented distinguishable color variations from red to yellow with dichlorvos concentrations ranging from 2.5 to 120μgL(-1), and the limit of detection was 1.0μgL(-1). In the practical samples testing, threaded 3D μPAD can eliminate background influence on fluorescent signal for OPs detection. Threaded 3D μPAD integrated with ratiometric sensing platform has merits of accuracy response, facile operation, and background-free detection, which supplies a new alternative approach for on-site pesticide detection.
摘要：
Novel red-emitting phosphors, Sr3LaTa3O12:Eu3+ (SLTO:Eu3+), have been successfully synthesized for use in white light-emitting diodes (w-LEDs) and latent fingerprint (LFP) visualization applications. The crystalline structure, bandgap, and photoluminescence (PL) of the SLTO:Eu3+ phosphors were thoroughly investigated. Under 395 nm excitation, SLTO:Eu3+ phosphors emitted orange-red light at the wavelength of 616 nm due to the D-5(0)-F-7(2) transition of Eu3+ ions. The optimal doping concentration of the phosphor is x = 0.30 and the neighbor ions interaction is the most critical factor in the concentration quenching mechanism of the SLTO:Eu3+ phosphor. Furthermore, the SLTO:0.30Eu(3+) phosphor exhibit higher thermal stability compared to the conventional red phosphor (Sr2Si5N8:Eu2+). The packaged w-LED showed a correlated color temperature (6887 K), excellent color rendering index (95), and Commission International de l'Eclairage (CIE) coordinates of (0.305, 0.334). The SLTO:0.30Eu(3+) phosphor effectively detected level 1-3 structures of LFPs under ultraviolet irradiation, and ultimately detected LFPs in various daily life circumstances. These findings indicate that the SLTO:0.30Eu(3+) phosphor might be a viable option for w-LED lighting applications and LFPs visualization.
作者机构：
[Guangming Yuan; Yao Yuan] College of Science, Central South University of Forestry and Technology, Changsha 410004, China;College of Horticulture, Hunan Agricultural University, Changsha 410128, China;Author to whom correspondence should be addressed.;[Fuxiang Cao] College of Science, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>College of Horticulture, Hunan Agricultural University, Changsha 410128, China<&wdkj&>Author to whom correspondence should be addressed.
通讯机构：
[Fuxiang Cao] C;College of Science, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>College of Horticulture, Hunan Agricultural University, Changsha 410128, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
Amino acid is the main transport form of reduced nitrogen in plants. To investigate the uptake and source–sink translocation process of plants to help understand their physiological roles and transport mechanisms, we designed and synthesized three fluorescent-dye-labeled amino acids as tools to visualize amino acid transportation in Arabidopsis thaliana; these amino acids consist of amino acids linked to the fluorophore nitrobenzoxadiazole (NBD) with excellent optical properties. Furthermore, we incubated Arabidopsis thaliana with these NBD fluorescent-dye-labeled amino acids for real-time imaging along with fluorescence enhancement for 24 h. The results showed that Arabidopsis thaliana could absorb them directly from the roots to the leaves. Therefore, our fluorescent-dye-labeled amino acids provide a de novo tool and strategy for visualizing amino acid absorption and transportation in plants.
作者机构：
[Gong, Huilin; Tan, Zhi; Zhong, Honghua] Cent South Univ Forestry & Technol, Sch Life Sci & technol, Changsha 410004, Peoples R China.;[Gong, Huilin; Tan, Zhi; Zhu, Bo; Hu, Shufang; Zhong, Honghua] Cent South Univ Forestry & Technol, Inst Math & Phys, Changsha 410004, Peoples R China.
通讯机构：
[Honghua Zhong] S;School of Life science and technology, Central South University of Forestry and Technology, Changsha, China<&wdkj&>Institute of Mathematics and Physics, Central South University of Forestry and Technology, Changsha, China
摘要：
We study construction and dynamics of two-dimensional (2D) anisotropic vortex-bright (VB) soliton in spinor dipolar Bose-Einstein condensates confined in a 2D optical lattice (OL), with two localized components linearly mixed by the spin-orbit coupling and long-range dipole-dipole interaction (DDI). It is found that the OL and DDI can support stable anisotropic VB soliton in the present setting for arbitrarily small value of norm N. We then present a new method via examining the mean square error of norm share of bright component to implement stability analysis. It is revealed that one can control the stability of anisotropic VB soliton only by adjusting OL depth for a fixed DDI. In addition, the dynamics of the anisotropic VB soliton was studied by applying the kick to them. The mobility of the single kicked VB soliton is Rabbi-like oscillation. However, for the collision dynamics of two kicked anisotropic VB solitons, their properties mainly depend on their initial distance and OL, and they can realize the transition from the bright component to the vortex component. Our work may provide a convenient way to prepare and manipulate anisotropic VB soliton in high-dimensional space.
通讯机构：
[Jia, SS ] S;[Guo, X ] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;Sichuan Agr Univ, Coll Forestry, Chengdu 611130, Peoples R China.
关键词：
Wood;Adsorption;Photocatalysis;Quantum dots
摘要：
To address chromium pollution in water resources, a novel photocatalytic adsorbent, CdS quantum dots/nano-TiO2 incorporated wood (QNIW), was synthesized for efficient removal of Cr(VI), which displayed both long-term stability and easy separability. We extensively analyzed QNIW using a range of analytical techniques to investigate its morphology, structure, optical characteristics, as well as adsorption and photocatalytic properties. The adsorption experiments revealed QNIW's remarkable capacity for Cr(VI) adsorption in the absence of light, reaching a maximum value of 482.1 mg/g calculated using the Langmuir model. This value was 8.4 times greater than that of natural wood. The outcomes of adsorption and photocatalytic experiments showcased QNIW's superior performance. Specifically, the photocatalytic reaction rate coefficient of QNIW was measured to be 0.0661 +/- 0.0078 min(-1) under specific conditions: UV light intensity of 500 mW/cm(2), adsorbent concentration of 0.25 g/L, pH of 2, initial Cr(VI) concentration of 20 mg/L, and temperature of 20 degree celsius. Remarkably, this coefficient exceeded that of pure nano-TiO2 by an impressive factor of 6.2. Importantly, QNIW exhibited exceptional stability, preserving 92.2 % of its initial removal efficiency after twelve weeks storage and maintaining 83.4 % efficiency even after undergoing five consecutive adsorption-desorption cycles. Thus, this study offers valuable insights into the progress of photocatalytic adsorbents characterized by high efficiency, enduring stability, and facile separability from treated wastewater.
作者机构：
[Chen, Jianghua; Chen, Zhaoqun; Lai, Yuxiang] Hunan Univ, Coll Mat Sci & Engn, Ctr High Resolut Electron Microscopy, Changsha 410082, Hunan, Peoples R China.;[Liu, Linghong] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;[Liu, Ziran] Hunan Normal Univ, Dept Phys, Changsha 410081, Peoples R China.;[Liu, Ziran] Hunan Normal Univ, Key Lab Low Dimens Struct & Quantum Manipulat, Minist Educ, Changsha 410081, Peoples R China.
通讯机构：
[Yuxiang Lai] C;[Ziran Liu] D;Center for High-Resolution Electron Microscopy, College of Materials Science & Engineering, Hunan University, Changsha, China<&wdkj&>Department of Physics and Key Laboratory for Low-Dimensional Structures and Quantum Manipulation (Ministry of Education), Hunan Normal University, Changsha, China
期刊：
Science of The Total Environment,2023年890:164314 ISSN：0048-9697
通讯作者：
Wang, Wenlei
作者机构：
[Wang, Wenlei; Yang, Junhui; Zhang, Huidi; Wang, Jing] College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;[Xiao, Hongbo; Yin, Jinglin; Deng, Yao; Wang, Lizhi] College of Science, Central South University of Forestry and Technology, Changsha 410004, China;[Xiao, Hongbo; Wang, Lizhi] Institute of Chemical Disposal and Resource Utilization of Hazardous Wastes, Central South University of Forestry and Technology, Changsha 410004, China;[Zhang, Cuihong] Institute of Chemical Disposal and Resource Utilization of Hazardous Wastes, Central South University of Forestry and Technology, Changsha 410004, China;[Wang, Wenlei] College of Science, Central South University of Forestry and Technology, Changsha 410004, China
通讯机构：
[Wenlei Wang] C;College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>College of Science, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Institute of Chemical Disposal and Resource Utilization of Hazardous Wastes, Central South University of Forestry and Technology, Changsha 410004, China
摘要：
In this study, MnPc intercalated Zn/Fe layered double hydroxides (MnPc/ZF-LDH) were synthesized by pillared intercalation modification with different MnPc intercalation amounts and used for the selective transformation and removal of As(III) from the arsenate-phosphate mixed solution. Fe-N bonds were constructed by the complexation of MnPc and iron ions on the Zn/Fe layered double hydroxides (ZF-LDH) interface. The DFT calculation results show that the binding energy of Fe-N bonded to arsenite (-3.75eV) was higher than that of phosphate (-3.16eV), resulting in MnPc/ZnFe-LDH exhibiting high As(III) selective adsorption performance and anchoring it rapidly in the arsenite -phosphate mixed solution. The maximum adsorption capacity of 1MnPc/ZF-LDH for As(III) could reach 180.7mg·g(-1) under dark conditions. MnPc also acts as a photosensitizer to provide more active species for the photocatalytic reaction. A series of experiments demonstrated that MnPc/ZF-LDH exhibits high As(III) selective photocatalytic performance. A total of 10mg·L(-1) of As(III) was completely removed in the reaction system within 50min in a single As(III) environment. In an environment with As(III) and PO(4)(3-), it achieved 80.0% removal efficiency of As(III) and showed a good reuse effect. The introduction of MnPc could improve the utilization of visible light by the MnPc/ZnFe-LDH. The singlet oxygen generated from photoexciting MnPc leads to abundant ZnFe-LDH interface OH. In addition, MnPc/ZnFe-LDH shows good recyclability, making it a promising multifunctional material for the purification of arsenic-polluted sewage.
通讯机构：
[Yongfeng Luo] H;Hunan Province Key Laboratory of Materials Surface & Interface Science and Technology, College of Science, Central South University of Forestry and Technology, Changsha, Hunan 410004, PR China
