SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Haiyan Wang,Peizeng Yang,Yiqian Song,Deyang Kong,Junhe Lu
UV-based treatment technologies have been widely applied in wastewater treatment plants due to its high efficiency in deactivating pathogens and degrading organic contaminants. However, this study demonstrates that N -nitrosodimethylamine (NDMA), a probable human carcinogen, can be generated during UV treatment of dimethylamine (DMA) pollutants of concern, for example isoproturon (IPU), in the presence of nitrite (NO 2 – ). Quenching tests have identified that in addition to direct photolysis, hydroxyl radicals (HO • ) and nitrogen oxide radicals (NO • and NO 2 • ) generated from NO 2 – photolysis play a crucial role in the reaction. They can react with IPU, leading to hydroxylated and nitrated products. More importantly, NO 2 • couples with a NO • or another NO 2 • to form N 2 O 3 and N 2 O 4 , respectively. As nitrosating agents, N 2 O 3 and N 2 O 4 directly attack the released DMA during IPU degradation, yielding NDMA. At IPU initial concentration of 50 μM, the highest concentration of NDMA was 5.62 μg/L in 2.5 h by UV/NO 2 – , corresponding to the molar yield of 0.22%. This study further reveals that other dimethylamine compounds, such as diuron, imipramine, and tetracyclines, can also serve as NDMA precursors during UV disinfection with NO 2 – present. Given that many environmental contaminants contain DMA moieties and NO 2 – is ubiquitously present in wastewaters, formation of NDMA during UV disinfection is probably a common but overlooked problem, which deserves emerging concern.
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NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Yuancheng He,Zhimeng Shen,Shujun Zhang,Gaobo Chang,Cheng Huang,Zhong Li,Hanqing Zhao
The addition of carbon nanotubes (CNTs) and graphene (G) to nitrogen-doped carbon nanofibers (N–C/CNFs) greatly improves their performance as sodium ion battery anodes. However, there is currently limited research on whether the introduction of nanocarbon materials will affect the surface functional groups, defects, and material structure. Herein, the classical G and CNT were introduced into the N–C/CNFs. And the addition of G promotes the transformation of nitrogen-containing functional groups (NFGs), resulting in a substantial pore structure and an enlarged interlayer distance, which enhances the macroscopic electrochemical performance significantly. The nitrogen-doped graphene/carbon composite nanofibers (N–G/CNFs) exhibit superior electrochemical performance compared to N–C/CNFs and nitrogen-doped carbon nanotube/carbon composite nanofibers (N–CNT/CNFs). After 200 cycles, the N–G/CNFs demonstrate a reversible capacity of 295 mA h g−1 at 0.05 A g−1, significantly higher than the capacities of N–C/CNFs (193 mA h g−1) and N–CNT/CNFs (237 mA h g−1). The Na3V2(PO4)3@C//N–G/CNFs exhibit promising energy and power densities.
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JOURNAL OF MOLECULAR STRUCTURE
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2024
·
IF 4
Yanping Dong,Xiqiang Tian,Hongji Zhao
Highly efficient synthesis of valuable furfuryl alcohol by furfural hydrogenation is still a challenge for Pt-based catalysts under mild conditions. Herein, we report the synthesis of N-doped TiO 2 nanosheets (N–TiO 2 –ST) by a simple one-step hydrothermal method. Subsequently, platinum catalysts were loaded onto N-doped TiO 2 nanosheets using a simple impregnation method followed by reduction with sodium borohydride (NaBH 4 ). The resulting catalysts exhibited excellent catalytic performance in the hydrogenation of furfural. Especially, the turnover frequency (TOF) of Pt/N–TiO 2 –ST reached 694 h -1 , much higher than that of Pt/TiO 2 -ST (565 h -1 ). Furthermore, the structure and surface properties of as-prepared samples was characterized with the combination of XRD, Raman, N 2 adsorption-desorption, SEM, TEM, XPS, CO chemisorption and CO-FTIR. The excellent catalytic performance of Pt/N–TiO 2 –ST can be ascribed to higher surface area and surface defects (oxygen vacancies) on the N-TiO 2 nanosheets, which improves the diffusion of Pt species on the support surface and forms ultrafine Pt particles to expose more active sites (Pt 0 species) for selective adsorption and activation of C O groups of furfural. The results show that Pt/N–TiO 2 –ST is a viable and promising catalyst for furfural hydrogenation.
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CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Ying Chen,Minghua Lin,Zihang Peng,Yumei Shu,Minhua Ai,Li Wang,Xiangwen Zhang,Ji-Jun Zou,Lun Pan
Homojunction is a viable alternative strategy to realize excellent charge separation for enhancing photoelectrocatalytic performance. However, the feasible regulation of the homojunction interface remains challenging. Herein, a ZnO n-p homojunction with the piezotronic effect is constructed via an in-situ solvothermal method for enhancing photoelectrocatalytic activity. ZnO nanorods are transformed from n-type to p-type ZnO nanoparticles with zinc vacancies, leading to the n-p homojunction. The optimal NPZ-36 exhibits a superior photocurrent density of 1.56 mA/cm 2 at 1.23 V vs. RHE and a high incident photon to current conversion efficiency of 75 % at 360 nm. Impressively, with the merits of inherent piezoelectric and photocatalytic properties of wurtzite ZnO, the piezoelectric-enhanced photoelectrochemical activity originates from the simultaneous promotion of bulk charge transfer and interfacial charge separation in ZnO n-p homojunction. The photocurrent density of NPZ-36–900 can reach to 2.02 mA/cm 2 under the stirring rate of 900 rpm, which is 2.1 times higher than that of pure ZnO photoanode.
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NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Bin Li,Aolin Wu,Mengjing Zhou,Ying Wang,Zhigang Hu,Lihua Su
In this paper, nitrogen-doped carbon quantum dots (N-CQDs) were prepared by using citric acid as a carbon source and ethylenediamine as a nitrogen source. Then, N-CQDs were added into a deep eutectic solvent (DES) synthesized from acrylamide (AM), urea (U), and choline chloride (ChCl). The N-CQDs/P(AM-U-ChCl) composite hydrogels were prepared by light polymerization. The chemical composition and microstructure of N-CQDs/P(AM-U-ChCl) composite hydrogels were characterized in detail using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). This article further explored the influence of the content of N-CQDs on the mechanical properties, adsorption properties, and detection performance of the composite hydrogel. The results showed that the composite hydrogels exhibited the best mechanical properties when N-CQDs' content was 0.3 wt%. The adsorption performance of N-CQDs/P(AM-U-ChCl) composite hydrogels for Fe3+ was significantly enhanced due to the carboxyl groups contained in N-CQDs. In detecting tert-butylhydroquinone (TBHQ), the composite hydrogel showed a good linear correlation in the concentration range of 0–200 mg L−1, and the detection limit of TBHQ reached 0.849 mg L−1. This study provides a new idea for preparing composite hydrogel materials with excellent mechanical properties and functionality. Also, it demonstrates their potential application value in heavy metal ion adsorption and organic molecule detection.
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Analytical Methods
·
2024
·
IF 2.7
Yuchen Zhou,Wanchun Chen,Guangyuan Wang,Zhenfeng Lei,Mei Zhang,Yanxia Li
A label-free immunosensor based on N-doped laser direct graphene (N-LIG)/Au electrode was proposed for H1N1 influenza virus detection. By utilizing the instantaneous high temperature of laser irradiation, N atoms generated by the decomposition of melamine dripped onto the surface of LIG electrode to obtain N-LIG with higher conductivity. The doping of N atoms provides a large number of active sites for LIG microelectrodes. Combined with the electrodeposition of Au NPs, and covalently crosslinking antibodies, a simple, highly sensitive and stable immunosensing interface is constructed. The proposed H1N1 influenza virus immunosensor has a detection range of 0.01 fg mL-1 to 10 ng mL-1 with a detection limit as low as 0.004 fg mL-1. The constructed sensor has ultra-high sensitivity, good selectivity, and can be used for complex biological sample analysis, with potential application prospects in preventing the large-scale spread of influenza. Taking advantage of N-LIG electrode’s properties will provide opportunities for developing portable electrochemical biosensors for health and environmental applications.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Lingjia Ma,Jiongliang Yuan,Zhaotao Liu,Yiqing Luo,Yuning Su,Kunye Zhu,Zefeng Feng,Huihua Niu,Shuaishuai Xiao,Jianjun Wei,Xu Xiang
The electrocatalytic synthesis of high-value-added urea by activating N2 and CO2 is a green synthesis technology that has achieved carbon neutrality. However, the chemical adsorption and C–N coupling ability of N2 and CO2 on the surface of the catalyst are generally poor, greatly limiting the improvement of electrocatalytic activity and selectivity in electrocatalytic urea synthesis. Herein, novel hierarchical mesoporous CeO2/Co3O4 heterostructures are fabricated, and at an ultralow applied voltage of −0.2 V, the urea yield rate reaches 5.81 mmol g–1 h–1, with a corresponding Faraday efficiency of 30.05%. The hierarchical mesoporous material effectively reduces the mass transfer resistance of reactants and intermediates, making it easier for them to access active centers. The emerging space-charge regions at the heterointerface generate local electrophilic and nucleophilic regions, facilitating CO2 targeted adsorption in the electrophilic region and activation to produce *CO intermediates and N2 targeted adsorption in the nucleophilic region and activation to generate *N ═ N* intermediates. Then, the electrons in the σ orbitals of *N ═ N* intermediates can be easily accepted by the empty eg orbitals of Co3+ in CeO2/Co3O4, which presents a low-spin state (LS: t2g6eg0). Subsequently, *CO couples with *N ═ N* to produce the key intermediate *NCON*. Interestingly, it was discovered through in situ Raman spectroscopy that the CeO2/Co3O4 catalyst has a reversible spinel structure before and after the electrocatalytic reaction, which is due to the surface reconstruction of the catalyst during the electrocatalytic reaction process, producing amorphous active cobalt oxides, which is beneficial for improving electrocatalytic activity.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yujie Cheng,Binbin Wang,Yueyue Lv,Xiaokang Zhang,Yue Han,Yaowu Wang,Shilong He,Yao Li,Lingwei Xue
The electron transport layer (ETL) is a major component of inverted perovskite solar cells (PSCs). It is an effective method for preparing efficient and stable organic ETLs to solve problems such as poor interface contact, adverse energy-level matching, and the lack of a significant passivation effect on perovskites. In this work, two structurally similar n-type branched shoulder-chain small molecules, CY3 and CY4, incorporating [6,6]-phenyl C61-butyric acid methyl ester (PCBM), were established as ETLs for inverted PSCs. The results of experimental tests showed that CY3 and CY4 could effectively passivate electron vacancy defects in perovskites, optimize the energy level alignment between the layers of the PSCs, and significantly improve the interface contact between the ETL and the perovskite layer. Consequently, the PSCs with PCBM:CY4 as the ETL achieved a high power conversion efficiency (PCE) of 19.80% and a stability of 760 h in an air atmosphere, compared to PCBM:CY3 (18.78%, 620 h). Our results provide theoretical guidance and a foundation for constructing high-performance ETLs.
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Journal of Energy Storage
·
2025
·
IF 9.8
Lu Zhong,Yuejia Qin,Zenan Zhou,Lianyun Zhong,Jietian Liang,Shaohui Hu,Qifan Liu,Yanfei Zeng,Shunmin Yi,Hui You,Shengkui Zhong,Dongliang Yan
Olivine-type lithium iron phosphate (LFP) serves as a prominent cathode material for Li-ion batteries, attributed to its natural abundance, remarkable cycling stability, eco-friendliness, and cost-effectiveness. Nonetheless, its additional utilization has been constrained by its inherent low conductivity and sluggish lithium-ion diffusion rate. Incorporation of heteroatom-doped carbon coatings serves as an effective method to enhance the electrochemical properties of LFP, leading to a notable improvement in both the electronic and ionic conductivity of the material. At present, however, the preparation of heteroatom-doped carbon cladding layer is mostly done by secondary sintering method, which is too cumbersome. In this paper, lithium iron phosphate containing N- and S-element doped carbon layers is synthesized by a simple one-step ball milling method using zein as a source of carbon layers and heteroatoms. The results show that the N- and S-doped carbon-coated lithium iron phosphate prepared from zein has lower polarization by enhancing the diffusion kinetics of the lithium-ion battery. NS/C15@LFP shows an initial discharge specific capacity of 155.97 mAh·g −1 at 0.1C and still shows 84.06 mAh·g −1 at 20C. After returning to 0.1C, there is still a discharge capacity of 161.4 mAh·g −1 . The capacity retention rate is 87 % after 500 cycles at 1C and 89 % after 500 cycles at the high current density of 5C, suggesting its excellent electrochemical performance. This work shows that lithium iron phosphate coating N- and S-doped carbon synthesized by using zein as the carbon source and heteroatom donor is a simple and low-cost strategy that gives LFP excellent electrochemical performance.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Xinghao Liu,Nan Li,Xugui Lv,Jingjing Wang,Qingyu Ma,Zheng Xie
Two-dimensional (2D) materials consist of either a single layer or just a few layers of atoms or molecular layers, and their exceptional optoelectronic properties including high carrier mobility, wide spectral absorption range, and optical response from the number of layers. Graphene quantum dots (GQDs) as a small-sized 2D material exhibited unique physical and chemical properties at the quantum scale. In this study, he N, S-doped GQDs (named as Y-GQDs) were synthesized through straightforward solvothermal process using 2,2'-dithiobenzoic acid and o-phenylenediamine as the precursors. The distribution of the prepared GQDs sample was uniform, with height varying between 0.6 and 0.8 nm. The excellent optical properties of Y-GQDs were attributed to the high crystalline graphene structure and rich functional groups including -C-SO 3 -C-, -C-SO 4 -C-, C-N, etc . The optimal excitation and emission wavelengths of Y-GQDs were 380 nm and 535 nm, respectively. Additionally, the multi-color and tunable luminescence characteristics could be achieved by excitation wavelength, solvent, and concentration. Gratifyingly, the N, S-doped GQDs were successfully used to build white light emitting devices via a sol-gel process. The color rendering index reached 83.7 with color temperature of 5306 K, and the GQDs exhibited good optical stability under different driving currents and UV light. This study underscored the significant potential of GQDs in creating promising phosphors for superior lighting applications.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 1
·1-10
·
IF 5.3
Yang Dou,Shao Tong,Wang Xiaoshuang,Hong Min,Li Rui,Li Chenzhong,Yue Qiaoli
New portable hydrogel sensors for Al 3+ and Fe 3+ detection were designed based on the aggregation-induced emission (AIE) and color change of N-doped carbon dots (N-CDs). N-CDs with yellow fluorescence were prepared by a one-pot hydrothermal method from 2,5-dihydroxyterephthalic acid and acrylamide. The fluorescence of N-CDs was enhanced by Al 3+ about 20 times and quenched by Fe 3+ . It was interesting that although Fe 3+ showed obvious quenching on the fluorescence of N-CDs it did not cause a noticeable change in the fluorescence of N-CDs + Al 3+ . The colorless solution of N-CDs appeared blue in the presence of Fe 3+ without the influence of Al 3+ . Therefore, the turn-on fluorometry and colorimetry systems based on N-CDs were constructed for the simultaneous detection of Al 3+ and Fe 3+ . Furthermore, the portable sensing of Al 3+ and Fe 3+ was realized with the assistance of hydrogel, filter paper, cellulose acetate, and cellulose nitrate film. The proposed approach was successfully applied to the detection of Al 3+ and Fe 3+ in food samples and cell imaging. Graphical Abstract
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CNS Neuroscience & Therapeutics
·
2025
·Vol. 31
·期 1
·e70197
·
IF 5
Weiwei Rong,Xunjia Qian,Yujian Yin,Yipeng Gu,Weiyi Su,Jie‐Jia Li,Yue Xu,Hongyan Zhu,Junxu Li,Qing Zhu
NDSM demonstrates good analgesic efficacy in preclinical pain models with fewer side effects than sinomenine. The analgesic effects of NDSM are mediated primarily by GABRA2 and partially by GABRA3. NDSM shows promise as a novel analgesic candidate for chronic pain management.
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