ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Hui Zhang,Ziqi Wang,Yahui Ji,Feifei Chen,Fei Wang,Gen Liu
Background Glutathione (GSH) serves as a pivotal antioxidant within biological systems. Dysregulated GSH levels are associated with a spectrum of pathologies, including carcinogenesis, hepatic dysfunction, and neurodegenerative disorders. Developing robust GSH detection methodologies is essential for assessing cellular health, facilitating early diagnosis of disease states, and tracking therapeutic efficacy. Electrochemiluminescence (ECL), which integrates electrochemical reactions with luminescent output, offers low background noise, making it highly suitable for biomolecule analysis. ECL-based GSH assays employing advanced nanomaterials are anticipated to amplify signals at low GSH concentrations, thereby playing a critical role in clinical diagnostics and biochemical research. Results This study presents a novel ECL sensor for the ultrasensitive detection of GSH, utilizing chromium/g–C 3 N 4 –loaded carbon nanospheres (CNs@Cr/g-C 3 N 4 ) composites. Carbon spheres (CNs) and chromium (Cr) can improve the ECL properties of g-C 3 N 4 . However, the ECL signal of CNs@Cr/g-C 3 N 4 is quenched (off-state) due to complex formation with Cu 2+ . Upon GSH addition, the higher coordination affinity between GSH and Cu 2+ partially restores the ECL signal of g-C 3 N 4 (on-state), allowing for quantitative GSH detection. Under optimized conditions, the linear detection range for GSH extends from 5.0 × 10 −9 to 1.0 × 10 −4 M with a limit of detection (LOD) of 3.3 × 10 −10 M (S/N = 3), alongside high selectivity, stability, and reproducibility. More notably, the as-proposed ECL sensor was successfully applied to the quantification of GSH in real drug samples with excellent recovery rates. Signifiance In contrast to traditional techniques for GSH detection, our approach involves a one-time chemical modification of the electrode, eliminating the need for complex probe immobilization steps and streamlining the detection process. Besides, this “off-on” ECL sensing strategy, leveraging Cu 2+ and CNs@Cr/g-C 3 N 4 , offers an innovative approach for developing advanced sensing systems. And this method is user-friendly, cost-effective, holding significant potential for applications in clinical diagnostics and pharmaceutical analysis.
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Frontiers of Chemical Science and Engineering
·
2021
·Vol. 15
·期 5
·1185-1196
·
IF 4.204
Liu Wanyue,Liu Xiaoqin,Chang Jinming,Jiang Feng,Pang Shishi,Gao Hejun,Liao Yunwen,Yu Sheng
The magnetic nitrogen-doped carbon (MNC) was prepared from polypyrrole by a simple high temperature calcination process in this paper. The structure and properties of MNC were analyzed by scanning electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction, Brunner-Emmet-Teller, vibrating sample magnetometer, and X-ray photoelectron spectroscopy. The capacity of MNC to adsorb Cr(VI) and Pb(II) was evaluated. The effects of the initial pH, dosage, concentration and temperature on the adsorption capacity of MNC were measured. MNC had a large specific surface area and a special porous structure. Its nitrogen and carbon sources were rich, and the ratio of carbon to nitrogen was fixed. The maximum Cr(VI)-adsorption capacity and maximum Pb(II) adsorption capacity of MNC could reach 456.63 and 507.13 mg·g −1 at 318 K, respectively. The pseudo-second-order model was used to describe the adsorption kinetics of MNC, and the Freundlich model was employed to discuss its isotherms. The adsorption process was affected by the electrostatic force, the reducing reaction, pores and chelation. The results of this study suggest that MNC is a material with superior performance, and is very easily regenerated, reused, and separated in the adsorption process.
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Nanoscience and Nanotechnology Letters
·
2019
·Vol. 11
·期 2
·229-233
·
IF 0
Zhao Tian,Yu Jun,He Ziyu,He Nongyue,Dong Ming,Chen Zhu,Chen Hong
The well investigated chromium-benzenedicarboxylate metal-organic framework (MOF), nano-sized MIL-101(Cr), was synthesized in this study by using tetramethylammonium hydroxide (TMAOH) or acetic acid (HAc) as modulator. The addition of TMAOH/HAc played a crucial role on particle size
and morphology of MIL-101(Cr). The obtained MIL-101(Cr) had average diameter of about ∼90 nm in selected condition, and possessed relatively high porosity (the BET surface area can up to 3500 m2/g). Furthermore, compared to bulk phase MIL-101(Cr), the nano-MIL-101(Cr) presented
significant improvement of catalytic activity in oxidation of indene.
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CATALYSIS TODAY
·
2013
·
IF 2.98
Xuefeng Hu,Huanhuan Ji,Fei Chang,Yongming Luo
In this study, a rapid reduction of Cr(VI) and degradation of 2,4,6-trichlorophenol (2,4,6-TCP) in a simultaneous manner was reported through the catalysis of g-C 3 N 4 under visible light ( λ > 420 nm) irradiation. The effects of initial concentration of reactants, dissolved O 2 and pH value were investigated systematically. It indicated that, under the optimized concentration, the Cr(VI) reduction and 2,4,6-TCP oxidation could be accomplished in couple of hours in the presence of g-C 3 N 4 . And also, the O 2 involvement and low pH value were able to significantly improve the removal rate of Cr(VI) and 2,4,6-TCP. In addition, the reaction mechanism was investigated through monitoring the reduced states of Cr(VI) and active oxygen intermediates formed during photoreaction by ESR and XPS, as well as determining the degradation products of 2,4,6-TCP by HPLC–MS. The results supported that the redox reactions of Cr(VI) and 2,4,6-TCP can be performed simultaneously via a synergistic oxidation–reduction mechanism in the presence of g-C 3 N 4 under visible light irradiation.
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CHEMOSPHERE
·
2018
·
IF 4.427
Peng Liu,Xiangyu Wang,Jun Ma,Huiling Liu,Ping Ning
To provide superior substrates and determine the specific species of immobilized nano zero-valent iron (NZVI) system, polyacrylonitrile (PAN) membrane was functionalized by bio-inspired polydopamine (PDA) and poly( l -DOPA) (PDOPA) for efficient immobilization of NZVI. The synthesized composites were denoted as PAN/PDA-NZVI (PPN) and PAN/PDOPA-NZVI (PON), respectively. Analyses of XRD, SEM/EDS and XPS show that the aggregation and release of iron nanoparticles had been successfully controlled by improving membrane hydrophilcity and iron-chelating capacity via the graft of functionalized groups (i.e. OH and COOH) of PDA and PDOPA on PAN membrane. Both PPN and PON composites exhibited superior reactivity for Cr(VI) removal (Cr(VI) removal efficiency and reaction rate were 2.21–2.22 and 9.90–10.14 times higher than that of bare NZVI, respectively). The stability and recyclability of PPN and PON composites could be maintained over repeated cycles. Further analyses indicate that PON is more capable for Cr(VI) elimination than PPN due to the proprietary carboxyl of l -DOPA. With the addition of 1,10-phenanthroline, membrane-chelated Fe(II) was determined to be the major species in Cr(VI) removal system, accounting for 56.9% and 53.8% with regard to PPN and PON composites, and Fe 0 was responsible for the reduction of residual Cr(VI). Analyse of reacted composites revealed that Cr(VI) was completely converted into Cr(III), followed by formation of dominant Cr(III)/Fe(III) (oxy)hydroxides and partial desorption from NZVI reactive sites. This study suggested that both synthesized PPN and PON composites have potentials for Cr(VI)-contaminated wastewater treatment .
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Fanglin Ming,Jingzhou Hou,Changjun Hou,Mei Yang,Xianfeng Wang,Jiawei Li,Danqun Huo,Qiang He
A novel, simple and low-cost nitrogen doped carbon dots (N-CDs) fluorescent sensor for sensitive detection of Cr (VI) was developed via one-step hydrothermal method using thymidine as carbon source. As-prepared N-CDs exhibited the ability of sensitive and selective detection of Cr (VI) through the inner filter effect (IFE). The performances of N-CDs were investigated with the characterization methods of transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Under the optimized conditions, a good logarithm correlation between the fluorescence intensity of N-CD S and the concentration of Cr (VI) was obtained ranging from 0.1 μM to 430 μM (R 2 = 0.992), with a low detection limit (LOD; S/N = 3) of 1.26 nM. The fluorescent sensor showed good repeatability, reproducibility and stability. Furthermore, N-CDs fluorescent sensor had a good applicability for Cr (VI) detection in real water samples with acceptable recoveries, and the detection results were consistent with the inductively coupled plasma mass spectrometry (ICP-MS) results, indicating this fluorescent sensor has a great potential for the environmental monitoring.
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Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 11
·3057-3062
·
IF 5.934
Weixuan Zeng,Sheng Cao,Lulu Qiao,Anquan Zhu,Quanyin Ma,Xiewen Xu,Yi Chen,Jun Pan
In the present study, we report a one-step hydrothermal synthesis of visible-light response Cr-doped Sr2Ta2O7 nanosheets for photocatalytic hydrogen generation. It is discovered that the Cr ion is successfully doped into the Sr2Ta2O7 nanosheet crystal lattice and uniformly distributed without changing the crystal structure and morphology of the Sr2Ta2O7 host. Compared to pristine Sr2Ta2O7, the as-prepared Cr-doped Sr2Ta2O7 photocatalysts show enhanced photocatalytic activity for hydrogen generation under visible-light irradiation. The spectroscopy and Mott–Schottky results reveal that proper Cr doping can narrow the band gap of Sr2Ta2O7 as well as facilitate the separation of photo-generated electrons and holes, thus enhancing the photocatalytic performance under visible-light irradiation. This work provides a simple approach to fabricate visible-light active tantalum-based oxide photocatalysts.
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WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 237
·期 6
·331
·
IF 3
Chen Xinyu,Shen Xudong,Hua Yu,Lian Jianjun,Kong Qiaoping,Ye Tianran,Chen Bo,Wang Xinyang
The lignocellulosic biorefinery sector holds significant potential to play a pivotal role in advancing global carbon neutrality goals. However, the efficient utilization of waste lignin remains a critical bottleneck, severely impeding the sustainable development of this industry. This study used a two-step method to prepare zinc and nitrogen activated lignin (Zn/N-lignin), and investigated its removal performance, influencing factors, and potential mechanisms for hexavalent chromium Cr(VI) in water. Results indicated that Cr(VI) removal process conformed to the Langmuir adsorption isotherm model and pseudo-second-order kinetic model. At an initial Cr(VI) concentration of 10 mg·L −1 and an adsorbent dosage of 400 mg·L −1 , the maximum adsorption capacity at 298 K was 284.61 mg·g −1 . Low concentrations (less than 0.1 mmol·L −1 ) of cations Ca 2+ and Mg 2+ , as well as competitive anions H 2 PO 4 − and NO 3 − , have little effect on the removal of Cr(VI). Zn/N-Lignin possessed a good regeneration performance, and the removal efficiency still reached more than 80% after five adsorption and desorption times. Spectral analysis and density functional theory calculations indicated that the main mechanisms of Zn/N-Lignin for removing Cr(VI) from water were electrostatic adsorption, hydrogen bonding and chemical reduction. In order to investigate the environmental impact of the preparation process of Zn/N-Lignin, a life cycle assessment (LCA) was conducted and the contribution of each component to the production of Zn/N-Lignin was analyzed. These results show that Zn/N-Lignin is not only an effective pathway for lignin resource utilization, but also an economically efficient adsorbent for Cr(VI) removal. Graphical
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WATER RESEARCH
·
2025
·
IF 12.4
Huajing Zhou,Kun Wang,Liang He,Zilian Liu,Dianchao Kong,Qiang Zhang,Song Jin,Ying Han,Qingqing Guan,Guoping Sheng
Groundwater remediation presents significant challenges, while microbial electrocatalytic remediation is promising but suffers from low efficiency due to low periplasmic electron transfer. Unlike traditional methods, which involve directly improving the conditions for electron transfer, herein, we first developed an electron-enhanced proton motive force (PMF) strategy for effective Cr(VI) removal. The proton is used as a new mutagenic source to mutate microorganisms by coupling with a micro-electric field. Interestingly, the dominant bacterial species of Rhizobium can directly capture protons (H + ) and electrons from the cathode as energy sources, resulting in greater than 97% reduction and immobilization of Cr(VI) in groundwater. Since the increase in the proton concentration gradient across the cytoplasmic membrane is due to the free diffusion of protons through new proton transfer channels, the extracellular electron transfer (EET) process is accelerated significantly, and Cr(VI) can also shuttle inside the cell to be reduced. 13 C isotope tracer technology and genetic volcano maps were used to further monitor the active transmembrane ETC transport pathway. The accumulated H + transfers electrons through reduced coenzymes, such as glycoside hydrolases (GH3, GH13-40, and GH5-15) and beta-galactosidase (CBM43), establishing a new transmembrane transfer pathway in the periplasmic space. In addition, unlike conventional bioremediation techniques, the proton gradient intensifies the motive force (PMF-H + ) to accelerate the synthesis of adenosine triphosphate, which provides energy for the bioremediation of Cr(VI), leading to a high bioelectrocatalytic rate. The new PMF-H + strategy successfully restored Cr(VI)-contaminated groundwater in situ to meet the water quality standard, indicating great potential for groundwater remediation.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Hongxiang Chen,Zhilong Zhang,Xiaochun Wen,Ze Zhang,Fa Chang,Jianeng Huang,Yunfeng Su,Hengzhong Fan,Bing Xiao,Yongsheng Zhang
The discovery of out-of-plane ordered (o-MAX) phases has been largely confined to Al-containing systems, leaving a critical gap in understanding chemical ordering mechanisms across other A-element families. Meanwhile, the 413-type Ge-based MAX phases in bulk form are still lacking. Here, we report the first synthesis of bulk Ge-based 413-type MAX phases: Cr 2 Ti 2 GeC 3 , (Cr 1/3 Ti 1/3 Mo 1/3 ) 4 GeC 3 , and (CrTiVMo)GeC 3 , thereby expanding both structural complexity and chemical ordering paradigms in nanolaminate ceramics, and introducing the second series of o-MAX phases. Through combined Rietveld refinement and atomic-resolution elemental mapping, we demonstrate robust Ti-Cr out-of-plane chemical ordering in these phases, with Ti preferentially occupying the inner metal layers adjacent to Ge atoms and Cr populating the outer layers. This chemical ordering pattern is preserved even in quaternary metal compositions. In contrast, the introduced Mo and V are distributed almost randomly at both sites. First-principles calculations demonstrated the thermodynamic stability and electronic structure, and quantified the mechanical properties of Ge-based 413 phases, revealing enhanced mechanical moduli and tunable ductility through V/Mo incorporation. This work expands the o-MAX family beyond Al-based systems, establishing Ge-containing high- n phases as a platform for designing chemically ordered nanolaminates with tailored stiffness-ductility balance.
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Inorganics
·
2022
·Vol. 10
·期 3
·33
·
IF 3.149
Tian Zhao,Hexin Zhu,Ming Dong,Minmin Zou,Songfan Tang,Mingliang Luo,Xianggang Li
The chromium-benzenedicarboxylate metal–organic framework (MOF), MIL-101(Cr), is one of the most well-investigated and widely used prototypical MOFs. Regarding its synthesis, the use of a toxic modulator (usually HF) and high reaction temperature (220 °C) are the main factors hindering its further expansion of production and utilization. In fact, high quality MIL-101(Cr) crystals can be prepared at a much lower temperature (160 °C) with spherical morphology via an additive-free approach. Compared to traditional octahedral MIL-101(Cr), the spherical MIL-101(Cr) possesses higher adsorption performance toward dye molecules, including methyl orange (MO) and rhodamine B (RB). The results suggest that toxic additives and high reaction temperatures are not essential in the synthesis of MIL-101(Cr), and the fabrication of spherical MIL-101(Cr) may offer a facile and effective pathway for the large-scale industrial application of MIL-101(Cr).
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高影响因子
MOLECULES
·
2017
·Vol. 22
·期 4
·572
·
IF 2.861
Yun Zheng,Zihao Yu,Feng Lin,Fangsong Guo,Khalid A. Alamry,Layla A. Taib,Abdullah M. Asiri,Xinchen Wang
As a promising conjugated polymer, binary carbon nitride has attracted extensive attention as a metal-free and visible-light-responsive photocatalyst in the area of photon-involving purification of water and air. Herein, we report sulfur-doped polymeric carbon nitride microrods that are synthesized through thermal polymerization based on trithiocyanuric acid and melamine (TM) supramolecular aggregates. By tuning the polymerization temperature, a series of sulfur-doped carbon nitride microrods are prepared. The degradation of Rhodamine B (RhB) and the reduction of hexavalent chromium Cr(VI) are selected as probe reactions to evaluate the photocatalytic activities. Results show that increasing pyrolysis temperature leads to a large specific surface area, strong visible-light absorption, and accelerated electron-hole separation. Compared to bulk carbon nitride, the highly porous sulfur-doped carbon nitride microrods fabricated at 650 °C exhibit remarkably higher photocatalytic activity for degradation of RhB and reduction of Cr(VI). This work highlights the importance of self-assembly approach and temperature-control strategy in the synthesis of photoactive materials for environmental remediation.Keywords:carbon nitride;self-assembly;photocatalysis;pollutant degradation;Cr(VI) reduction
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