FUEL
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2023
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IF 7.4
Haoyue Fu,Weixin Qian,Haitao Zhang,Hongfang Ma,Weiyong Ying
Unmodified Cr/Al 2 O 3 and Cr/Al 2 O 3 doping with different alkali metals (Li, Na, K) were prepared by the incipient wetness impregnation method. The surface elements of all the catalysts are evenly distributed and well loaded, and the addition of alkali metals does not change the crystal structure and surface texture. Both Cr 6+ and Cr 3+ species exist on all catalysts, and the addition of alkali metals can increase the amount of Cr 6+ species, and Cr 6+ species are basically converted into active Cr 3+ species in the reaction thus increasing the initial propane conversion in the reaction. The addition of alkali metals reduced the amount of total acid sites and the strong acid sites of the catalyst, thus inhibiting the occurrence of side reactions and the formation of carbon deposition , and reducing the deactivation rate of the catalyst. Cr-0.5Na/Al 2 O 3 exhibited the best catalytic performance and the lowest carbon deposition.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
Analytical Methods
·
2019
·Vol. 11
·期 29
·3727-3735
·
IF 2.378
Jing Lu,Ling Wang,Xia Xu,Xiangxiang Qin,Xia Qiu,Zhu Yinggui
In this work, the electrogenerated chemiluminescence (ECL) behavior of a lanthanide Tb(III) complex was studied using thiophene carboxylic acid (3-thiophenecarboxylic acid, 3-TCA) as the ligand and triethanolamine (TEOA) as the co-reactant. The spectral features of the ECL and fluorescence (FL) of the Tb(III) complex were analyzed. The complexes were characterized by FT-IR and elemental analyses. The effects of TEOA concentration, pH, and scan rate on the ECL intensity were studied in detail. Furthermore, a simple ECL platform was reported for the sensitive and selective detection of Cr6+ based on quenching after the addition of Cr6+. A method for the detection of Cr6+ with high sensitivity was established, and the limit of detection was determined as 0.064 nM. It is anticipated that these complexes can be a new class of promising materials for fabricating ECL sensors to detect Cr6+ readily in environmental and practical samples.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
Chemical and Biological Technologies in Agriculture
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2026
·Vol. 13
·期 1
·1
·
IF 5.2
Meng Lifen,Ding Pengpeng,Ou Meiya,Zhang Yu
Background CQDs are an ideal platform material that integrates excellent optical properties, superior biosafety, flexible, and adjustable chemical properties. They serve as a bridge connecting nanotechnology with fields such as life sciences, environmental energy, and more. Methods In this study, Hc -DES-CQDs based on natural deep eutectic solvents and Houttuynia cordata were successfully prepared. Results The prepared Hc -DES-CQDs exhibits strong blue fluorescence and excellent photostability. The detection of trace Cr 6+ under acidic and alkaline conditions can be realized by Hc -DES-CQDs, and also successfully applied to practical environmental water samples. Spectral analysis reveals that Hc -DES-CQDs exhibits emission behavior related to excitation, with a quantum yield of approximately 17.3%. The Hc -DES-CQDs demonstrated excellent antibacterial and free radical scavenging effects (such as DPPH, ·OH). Conclusions Therefore, the Hc -DES-CQDs has potential applications in the analysis and combating of cellular oxidative stress. Graphical abstract
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高影响因子
Materials
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2019
·Vol. 12
·期 3
·468
·
IF 2.972
Chengkang Chang,Jian Dong,Li Guan,Dongyun Zhang
Li1.27Cr0.2Mn0.53O2layered cathodic materials were prepared by a nanomilling-assisted solid-state process. Whole-pattern refinement of X-ray diffraction (XRD) data revealed that the samples are solid solutions with layered α-NaFeO2structure. SEM observation of the prepared powder displayed a mesoporous nature composed of tiny primary particles in nanoscale. X-ray photoelectron spectroscopy (XPS) studies on the cycled electrodes confirmed that triple-electron-process of the Cr3+/Cr6+redox pair, not the two-electron-process of Mn redox pair, dominants the electrochemical process within the cathode material. Capacity test for the sample revealed an initial discharge capacity of 195.2 mAh·g−1at 0.1 C, with capacity retention of 95.1% after 100 cycles. EIS investigation suggested that the high Li ion diffusion coefficient (3.89 × 10−10·cm2·s−1), caused by the mesoporous nature of the cathode powder, could be regarded as the important factor for the excellent performance of the Li1.27Cr0.2Mn0.53O2layered material. The results demonstrated that the cathode material prepared by our approach is a good candidate for lithium-ion batteries.Keywords:cathode material;X-ray diffraction;Cr3+/Cr6+redox pairs;specific capacity;cycling performance
研究领域:
材料科学
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电化学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Ling Yu,Hui Wang,Qi Huang,Hainan Liu,Qingkong Chen,Bojie Yuan,Qi Li,Xiaofei Zhao,Junwang Tang,Deqiang Zhao
A series of BiVO 4 /InVO 4 composites were synthesized by one-pot microwave method based on the ratio regulation of Bi/In. Consequently, the as-fabricated BiVO 4 /InVO 4 photocatalysts performed higher photocatalytic activities (100%) than pure InVO 4 and BiVO 4 . The prepared photocatalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), UV–vis diffuse reflection spectroscopy (UV–vis DRS) and Fourier transform infrared spectra (FTIR). The results indicate the formation of BiVO 4 /InVO 4 and it possesses enhanced solar light absorption. The enhanced reduction rate is ascribed to the efficient separation of photogenerated charge carriers due to the heterojunction formed between BiVO 4 and InVO 4 . The possible photocatalytic mechanism of BiVO 4 /InVO 4 composite was also discussed in detail.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
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2026
·
IF 6
Mufan Niu,Qiyu Sun,Chongbin Wei,Fubin Peng,Xiaohe Huang,Han Yang,Ying Cui,Shenyong Ren,Chunming Xu,Baojian Shen
To elucidate the active sites and reaction mechanism of CrO x /ZrO 2 catalysts in CO 2 -assisted oxidative dehydrogenation (CO 2 -ODH) of ethane, a combination of multiple characterization techniques, DFT calculations, and in situ FTIR spectroscopy was employed. Results reveal the coexistence of isolated and polymeric Cr 6+ species on the catalyst surface, with catalytic activity exhibiting a strong positive correlation with the content of polymeric Cr 6+ , confirming its role as the key active component. Further investigation uncovers a distinct and strong electronic interaction between CrO x and ZrO 2 that facilitates the formation and stabilization of polymeric Cr 6+ . This interaction is absent in CrO x /CeO 2 and CrO x /TiO 2 systems, offering a theoretical rationale for the rational design of catalyst supports. Mechanistically, CO 2 plays a dual role: it participates in both ethane ODH and the RWGS reaction, and reoxidizes coordinatively unsaturated Cr 3+ to Cr 6+ , thereby enhancing reaction stability. This work elucidates the CO 2 -ODH pathway and the regulatory role of CO 2 , offering new insights into the design of active sites in CrO x -based catalysts. However, pronounced catalyst deactivation currently limits industrial application, highlighting the need for future efforts to focus on improving catalyst stability.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Shuying Gao,Lingling Pan,Weiguo Kong,Li Zhou,Jian Wu,Shijian Zhou,Weilong Shi,Fu Yang,Yan Kong
In this study, an energetic materials (EM) deflagration process coupled with a gas-shocking exfoliation strategy was proposed for the in-situ introduction of a π-electron-conjugated structure into ultrathin g-C 3 N 4 nanosheets. The optimal 2C-CNS sample was endowed with a porous-ultrathin-nanosheets morphology (3–4 nm thickness), larger exposed surface area (144.1 m 2 /g), and significant pore volume (0.51 cm 3 /g). Using urotropin-deflagration and gas-shocking-driven processes, the precursors were dissociated and copolymerized in an aqueous solution into g-C 3 N 4 nanosheets chemically modified with conjugated carbon moieties. Most importantly, an expanded π-electron conjugated system was successfully constructed between the carbon moieties that interacted with the ultrathin g-C 3 N 4 (2C-CNS), which endowed its with a faster electron-hole separation efficiency and enhanced visible-light harvesting ability. The H 2 evolution rate and Cr 6+ reduction efficiency for 2C-CNS reached 2360 μmol h −1 g −1 for k = 0.0301 min −1 , which was almost 25.8/23 times higher than that of bulk g-C 3 N 4 (Bu-CN, 91.2 μmol h −1 g −1 , k = 0.0013 min −1 ). Also, 2C-CNS showed 2.8/2.4 times higher performance than the g-C 3 N 4 ultrathin nanosheets without a carbon-section modification (0C-CNS, 853 μmol h −1 g −1 , k = 0.0125 min −1 ).
研究领域:
材料科学
·
光催化
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产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2016
·
IF 3.719
Jie Cai,Miao Lei,Qian Zhang,Jing-Ren He,Tian Chen,Shuang Liu,Si-Han Fu,Tian-Tian Li,Gang Liu,Peng Fei
Considerable interest has been devoted to developing nanoscale biomass materials as adsorbents for wastewater treatment. A facile route was proposed to prepare cellulose-based composite nanofibers via electrospinning of cellulose acetate with organically modified montmorillonite , followed by deacetylation. The composite nanofibers are suitable for metal adsorption given their reasonably high selectivity in removing Cr 6+ ions from aqueous solution. The effects of experimental parameters, including solution pH, temperature, and contact time, on the removal of Cr 6+ ions were determined in a batch system to optimize the adsorption conditions. Results from this study may provide a promising biosorbent that can be used as an emerging material in large-scale adsorption of heavy metal ions.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2026
·
IF 6
Shujing Pan,Kaiming Kan,Mengyu Zhang,Wenzhi Su,Yong Zou,Shoujun Ding
Long-wave-pass (LWP) optical filters based on single crystals offer superior thermal stability and high-power handling capability compared to conventional thin-film systems. In this work, high-quality Cr 6+ -doped Li 2 MoO 4 single crystals with varying dopant concentrations were successfully grown by the Czochralski method. Structural characterization confirms that the crystals retain a trigonal phase, with Cr ions predominantly substituting for Mo sites in the lattice in the +6 oxidation state. Optical measurements reveal that the absorption cutoff wavelength can be continuously tuned from 300 to 530 nm by adjusting the Cr 6+ concentration, while maintaining high transmittance in the long-wavelength region. First-principles calculations demonstrate that the incorporation of Cr 6+ introduces localized Cr-3d states within the bandgap, leading to effective bandgap narrowing and tunable optical response. In addition, the crystals exhibit favorable thermal conductivity and mechanical properties, supporting their suitability for high-power optical applications. These results establish Cr 6+ -doped Li 2 MoO 4 single crystals as promising candidates for thermally robust and spectrally tunable LWP optical filters.
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DOI
高影响因子
ACS Applied Nano Materials
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2025
·
IF 5.5
Qianyi Wu,Mohammed Kamruzzaman
The detection of mercury(II) (Hg2+) and chromium(VI) (Cr6+) is of significant importance due to their high toxicity and harmful effects on the environment and human health. Conventional detection methods are often expensive and time-consuming, highlighting the need for efficient alternatives. Nanozyme-based detection systems have emerged as promising solutions, offering high sensitivity, stability, and cost-effectiveness. However, many existing nanozymes contain toxic components, limiting their practical application in environmental and food safety monitoring. This study reported the development of an organic polymer-based C-A-Fe nanozyme, synthesized via a simple self-assembly chelation process and exhibiting peroxidase-like activity. This nanozyme enabled an effective colorimetric sensing approach for Hg2+ and Cr6+ detection. This nanozyme enables highly sensitive and selective colorimetric detection of Hg2+ and Cr6+ with the assistance of glutathione (GSH) and 8-hydroxyquinoline (8-HQ), achieving detection limits as low as 9.65 nM for Hg2+ and 4.13 nM for Cr6+. Moreover, the system demonstrated high recovery rates in tap water, cod, and spinach samples, confirming its potential for real-world applications in environmental and food safety monitoring.
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Ruoyao Zhang,Yi Zheng,Qiuya Zhang,Zelin Wu,Lei Wang,Juan Zhang,Hongwei Ren,Erhong Duan
Hexavalent chromium is the main compound in industrial wastewater, which is highly toxic and seriously pollutes the environment and endangers human health. The excellent fluorescence performance of carbon quantum dots (CQDs) is widely used to detect heavy metal ions. However, the quantitatively structure of CQDs is different to control in the formation due to the uncertain-complex of biomass-based materials. In this work, nitrogen-rich CQDs (N-CQDs) based on 4-A-1,2,4-TZ and glycerol deep eutectic solvents (DESs) was prepared by one-step hydrothermal method. The prepared N-CQDs exhibited excellent fluorescence stability. The response of the N-CQDs to Cr 6+ was linear in the range of 5-100 μM and a detection limit of 0.7043 μM. The results show that N-CQDs can achieve the detection of Cr 6+ well. Satisfactory recovery of Cr 6+ was also obtained by measuring in the wastewater.
研究领域:
环境科学
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Qi Zhu,Fei Feng,Zhong-er Long,Yunhong Huang,Haiyan Ni,Xueqin Fu,Longhai Dai,Long Zou
Microbial reduction is an economical and environmentally benign route to deal with high-toxic Cr 6+ widely present in aquatic environments, but faces major challenges such as cytotoxicity and insufficient organic electron donors. Herein, we propose a route for the removal of Cr 6+ from water using a ternary FeS/reduced graphene oxide/ Shewanella oneidensis MR-1 (FeS/rGO/MR-1) hybrid with external electricity supply at an electrode potential of −0.36 V. The biohybrid with excellent redox activity is in-situ biosynthesized by virtue of the versatile metabolic pathway and powerful extracellular electron transfer ability of MR-1 cells without the need of organic carbon sources. The biohybrid is directly used to remove Cr 6+ under the condition of continuous electricity input, the removal rate is negatively correlated with the applied electrode potential. Compared with binary FeS/MR-1 and rGO/MR-1 counterpart, the FeS/rGO/MR-1 hybrid achieves an improved ability to remove Cr 6+ at an initial concentration of 20 mg L −1 in three consecutive batches due to the synergistic effect. The FeS is the main active component for rapid chemical reduction of Cr 6+ because of its highly reducible Fe 2+ and S 2- , and rGO acts as the bridge to accelerate electron transfer from the applied electrode to MR-1 cells. Then, the MR-1 cells use the obtained electrons for FeS regeneration, which in turn reduces Cr 6+ again, resulting in the precipitation of less toxic Cr 3+ [Cr(OH) 3 and Cr 2 O 3 ] in the biohybrid. This study provides a feasible route for removal of toxic Cr 6+ from water lacking organic electron donor by in-situ synthesis of biohybrid with external electricity supply.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
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