Journal of the Australian Ceramic Society
·
2022
·Vol. 59
·期 1
·179-185
·
IF 1.741
Liu Yupu,Wang Shu,Yin Jianan,Li Xin
Based on the construction of type II heterojunction, the one-pot hydrothermal method was employed to synthesize Fe 2 O 3 /WS 2 composites with flower-like structures, which performed significant photocatalytic activities compared with the bare components. The systemic characterizations were employed to reveal the type II heterojunction photogenerated electron transfer mechanism and they further illustrated the path for electron–hole transfer and separation under the effect of heterojunction. Afterward, the photocatalytic properties of the catalysts were evaluated by degrading organic methylene blue and toxic Cr (VI) under simulated solar-driven irradiation. Among those, the best high-efficiency Fe 2 O 3 /WS 2 photocatalyst (2WF) displayed significant photocatalytic properties on pollution degradation in detail, with the Cr (VI) photoreduction rate of 0.35 μmol·min −1 ·g −1 cat. and the MB photooxidation rate of 0.27 μmol·min −1 ·g −1 cat. , respectively. The designed photocatalysts have integrated the three aspects of photocatalytic efficiencies, including the visible light response, prolonged photogenerated carrier lifetime, and sufficient surface active sites due to the amount of surface defects, therefore, this work provides more insights into the utilization of green energy for environmental treatment by heterostructured catalysts.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 14
·21279-21290
·
IF 0
Xiong Ling,Zhang Fen,Yang Yanan,Ding Yuqing,Chen Shaohua
A novel adsorbent, deposited PPy on the DMI (PPy/DMI) composite, was successfully synthesized for Cr(VI) removal from aqueous solution. PPy/DMI composite was characterized by BET, SEM, TEM, XRD, and XPS. The SEM and TEM analyses revealed that DMI can greatly reduce the aggregation of PPy and significantly enhance its adsorption performance. The Cr(VI) removal was highly pH dependent. The high selectivity of PPy/DMI composite for Cr(VI) removal was found even in the presence of co-existing ions. The adsorption kinetic process followed the pseudo-second-order equation, demonstrating that the Cr(VI) adsorption behavior onto PPy/DMI is chemisorption. Furthermore, the intra-particle diffusion model implied that the adsorption was controlled by both liquid membrane diffusion and internal diffusion. The adsorption isotherm data fitted well with the Langmuir model with the maximum adsorption capacity (406.50 mg/g at 323 K) which was considerably higher than that of other PPy-based adsorbents. The Cr(VI) adsorption onto PPy/DMI composite was endothermic. The main mechanisms of Cr(VI) removal are involved in adsorption through electrostatic attractions, ion exchange, and in situ reduction. The results suggested that PPy/DMI composite could be a promising candidate for efficient Cr(VI) removal from aqueous solution. Graphical
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Jianshuai Mu,Aizhu Peng,Xinran Wang,Jin Wang,Zengjiao Hong,Danna Guo,Shulai Lei,Jiajun Wang,En-Cui Yang
Designing low-cost and environmentally friendly oxygen evolution reaction (OER) electrocatalysts to enhance the electrocatalytic water decomposition to produce hydrogen still faces great challenges. In this work, a feasible strategy for metallic/nonmetallic elements co-doping to boost the OER catalytic properties of iron oxyhydroxide is proposed. A series of S and Cr co-doped iron oxyhydroxides nanoarrays loaded on nickel foam (Sx,Cr-FeOOH/NF) were prepared by an electrodeposition–hydrothermal method. The optimized S0.1,Cr-FeOOH/NF exhibits a superior electrocatalytic OER performance with low overpotential (235 mV at 100 mA cm–2), highly outperforming commercial RuO2. Meanwhile, the overpotential of S0.1,Cr-FeOOH/NF increases by only 4 mV after 70 h of stability testing at 100 mA cm–2, demonstrating its durability. The nanoarray with ultrathin nanosheets of S0.1,Cr-FeOOH/NF regulated by S and Cr co-doping can offer abundant active sites and also facilitate mass transportation. The density functional theory (DFT) calculation results show that S and Cr co-doping modifies the electronic structure of S0.1,Cr-FeOOH/NF, which thus optimizes the adsorption energy toward the OER intermediates, promotes the transformation of *O to *OOH (rate-determining step), and thus accelerates the OER kinetics.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Lina Chen,Rui Yao,Yijie Zhang,Wei Li,Jinping Li,Guang Liu
The development of efficient oxygen evolution (OER) catalysts in neutral media is crucial for the production of biomixed fuels and chemicals. The unique reaction environment makes the reaction kinetics sluggish and poses significant challenges for catalyst design. Therefore, this study presents the synthesis of W, Cr-Co 3 O 4 electrocatalysts using the hydrothermal calcination method for neutral OER. The doping of W and Cr modulates the electronic structure of Co 3 O 4 and enhances electrical conductivity. Moreover, the double doping of W and Cr accelerates the catalyst's reconstruction, thereby improving catalytic activity. The optimized W, Cr-Co 3 O 4 demonstrates efficient OER catalytic performance in 1 M phosphate buffer solution, with an overpotential of 347 mV at a current density of 10 mA cm −2 and stable operation for over 100 h. This work deepens the understanding of the reconstruction mechanism of OER catalysts in a neutral environment and provides valuable insights for the design of stable and efficient catalysts.
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高影响因子
TALANTA
·
2015
·
IF 3.545
Fang Yang,Cheng-Xiong Yang,Xiu-Ping Yan
Effective separation of tocopherols is challenging and significant due to their structural similarity and important biological role. Here we report the post-synthetic modification of metal–organic framework (MOF) MIL-101(Cr) with pyridine for high-performance liquid chromatographic (HPLC) separation of tocopherols. Baseline separation of four tocopherols was achieved on a pyridine-grafted MIL-101(Cr) packed column within 10 min using hexane/isopropanol (96:4, v/v) as the mobile phase at a flow rate of 0.5 mL min −1 . The pyridine-grafted MIL-101(Cr) packed column gave high column efficiency (85,000 plates m −1 for δ-tocopherol) and good precision (0.2–0.3% for retention time, 1.8–3.4% for peak area, 2.6–2.7% for peak height), and also offered much better performance than unmodified MIL-101(Cr) and commercial amino-bonded silica packed column for HPLC separation of tocopherols. The results not only show the promising application of pyridine-grafted MIL-101(Cr) as a novel stationary phase for HPLC separation of tocopherols, but also reveal a facile post-modification of MOFs to expand the application of MOFs in separation sciences.
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DOI
PubMed
高影响因子
PLoS One
·
2012
·Vol. 7
·期 8
·e43328
·
IF 4.092
Shangkun Li,Xiaofeng Lu,Yanpeng Xue,Junyu Lei,Tian Zheng,Ce Wang
In this paper, we report on the simple, reliable synthesis of polypyrrole (PPy)/graphene oxide (GO) composite nanosheets by using sacrificial-template polymerization method. Herein, MnO 2 nanoslices were chosen as a sacrificial-template to deposit PPy, which served as the oxidant as well. During the polymerization of pyrrole on surface of GO nanosheets, MnO 2 component was consumed incessantly. As a result, the PPy growing on the surface of GO nanosheets has the morphology just like the MnO 2 nanoslices. This method can provide the fabrication of PPy nanostructures more easily than conventional route due to its independence of removing template, which usually is a complex and tedious experimental process. The as-prepared PPy/GO composite nanosheets exhibited an enhanced properties for Cr(VI) ions removal in aqueous solution based on the synergy effect. The adsorption capacity of the PPy/GO composite nanosheets is about two times as large as that of conventional PPy nanoparticles. We believe that our findings can open a new and effective avenue to improve the adsorption performance in removing heavy metal ions from waste water.
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PubMed
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 22
·4399
·
IF 4.6
Yu Luo,Xunxian Chen,Zhen Wan,Yingming Chen
As a cost-effective and environmentally benign photocatalyst, hydrothermal carbonation carbon (HTCC) has been extensively studied in the fields of resource utilization and environmental remediation. In this study, HTCC photocatalysts with efficient photocatalytic performances were prepared from straw using acid modification under hydrothermal conditions. The as-prepared HTCC photocatalysts were applied to the degradation of microcystin-LR and the reduction of aqueous Cr(VI). The critical role of acid modification in the photocatalytic performances of the HTCC photocatalysts was systematically investigated. The results demonstrated that acid-modified photocatalysts exhibited a significantly enhanced removal efficiency for Cr(VI) and microcystin-LR under visible light irradiation. A series of characterization techniques, including Raman spectroscopy and N2adsorption–desorption analysis, revealed that the superior photocatalytic activities of acid-modified HTCC could be attributed to its higher aromatization level, enhanced light-harvesting ability, and increased concentration of active sites compared with pristine HTCC. Furthermore, electron spin resonance (ESR) and trapping experiments indicated that hydrogen radicals (·H) served as the primary active species in the photocatalytic Cr(VI) reduction of straw-based HTCC. This work provides both practical and theoretical insights into the resource utilization of agricultural waste and the remediation of environmental pollution.
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PubMed
高影响因子
Metals
·
2025
·Vol. 15
·期 12
·1320
·
IF 2.5
Xinyi Yuan,Rongcheng Sheng,Yizhe Du,Dengfu Chen,Mujun Long,Huamei Duan
To address the demands of modern high-speed and high-quality continuous casting production, depositing high-performance coatings on the surface of mold copper plates is critically important for extending the service life of continuous casting molds. To this end, a Ni-Co-Cr/SiC nanocomposite coating was developed, and cryogenic treatment was applied to further improve its hardness and wear resistance. This work systematically investigates the microstructural evolution and performance enhancement of the Ni-Co-Cr/SiC nanocomposite coating under different cryogenic treatment parameters, with special emphasis on the effects of treatment temperature on the coating’s microstructure, hardness, wear resistance, and adhesion to the substrate. The results demonstrate that decreasing the cryogenic treatment temperature and extending the holding time effectively refine the grains of the coating while simultaneously promoting the accumulation of microstrain and dislocation density. These changes lead to significant improvements in hardness, wear resistance, and interfacial bonding performance. Specifically, after direct immersion at −196 °C for 16 h, the coating reached a hardness value of 946.5 HV, and the wear rate was reduced to 0.032 mm3·(N·m)−1, representing only 54.6% of that of the untreated coating. The dominant wear mechanism transitioned to a mixed mode of abrasive wear and oxidative wear. Moreover, the cryogenic treatment enhanced the stability of the coating-substrate adhesion.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yong Zhang,Yuchang Qing,Junjie Yang,Chuanyang Jiang
SiC, with outstanding oxidation stability and tunable dielectric property, has been regarded as a promising microwave absorption material for high-temperature applications. However, the application of pristine SiC is restricted by its inadequate dielectric response and weak loss capability. Herein, a novel strategy is proposed to construct Cr-Si-C conductive shell on SiC surface via molten salt method is proposed to introduce heterogeneous interfaces and enhance dielectric loss. The optimal SiC@Cr-Si-C core-shell sample achieves a minimum reflection loss (RL m ᵢ n ) of −36.7 dB at a matching thickness of 1.4 mm. Meanwhile, it exhibits an effective absorption bandwidth (EAB) of 2.41 GHz. Notably, even after heat treatment at 600 °C in air for 5 h, the core-shell absorber maintains an intact core-shell structure and its RL m ᵢ n remains as high as −34.4 dB, demonstrating superior high-temperature stability. This work provides an effective method for high-performance microwave absorption materials targeted at high-temperature applications.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Duogui Wu,Rong Li,Yunlong Shi,Yun Li,Mei Yang,Yanyue Xiao,Meiyao Wu,Chunhua Wang,Changjiang Yu,Shuwen Wang
In the present study, sodium alginate (SA) was employed as the precursor and cross-linked with Fe3+ ions to form an SA–Fe3+ hydrogel. In an alkaline Na2S solution, the prepared hydrogel gradually released Fe3+ ions, which subsequently reacted with S2− ions to produce a uniformly dispersed alginate-FeS/S hybrid sol (denoted as SA-FeS/S). The SA-FeS/S sol was then converted into an FeS/FeSn carbon cryogel (BC@FeS/FeSn-T, where BC stands for biochar) through sequential freeze-drying and pyrolysis. The microstructure and composition of the resulting BC@FeS/FeSn-T cryogel were systematically characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The performance for the adsorption of Cr(VI) and the corresponding reaction mechanism of BC@FeS/FeSn-700 were thoroughly investigated. Moreover, BC@FeS/FeSn-700 exhibited superior Cr(VI) removal efficiency over a wide pH range, making it a highly promising candidate for remediating Cr(VI)-contaminated soils. The adsorption process proceeded via five distinct pathways: (i) Cr(VI)'s reduction by Fe2+ and HS− species released from FeS; (ii) direct electron transfer from FeS; (iii) redox reactions with various iron sulfides (FeS2, Fe3S4, and Fe1−xS); (iv) reduction by sulfite ions; and (v) surface adsorption onto biochar or metal oxides.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2018
·
IF 6.434
Qiaoping Kong,Jingyue Wei,Yun Hu,Chaohai Wei
In order to increase the density and quantity of functional groups on adsorbent, three terminal amino hyperbranched polymer modified graphene oxide adsorbents including GO-HBP-NH 2 -DETA, GO-HBP-NH 2 -TETA and GO-HBP-NH 2 -TEPA with N-containing functional group density of 7.21 wt%, 10.20 wt% and 12.43 wt%, respectively, were prepared and used for the adsorption and reduction of toxic hexavalent chromium Cr(VI) to less toxic Cr(III). The morphology and structure of obtained adsorbents were characterized by FT-IR, SEM, XRD, Raman, BET, XPS and zeta potential. The density of receptor sites (N m ) of the three adsorbents calculated from statistical physics model with one energy site were found to be 456.62, 604.54 and 636.03, respectively. Adsorption experiments demonstrated that the high adsorption capacities of the three adsorbents obtained from Langmuir isotherm model towards Cr(VI) were 245.01, 257.26 and 300.88 mg/g, respectively, suggesting that GO-HBP-NH 2 -TEPA had better adsorption ability. The density functional theory calculation (DFT) indicated that GO-HBP-NH 2 -TEPA was more likely to adsorb HCrO 4 − rather than Cr 2 O 7 2− at lower pH conditions. A possible adsorption mechanism was also proposed where electrostatic interaction between Cr(VI) (HCrO 4 − or Cr 2 O 7 2− ) and the N functional group (+) on GO-HBP-NH 2 -TEPA dominated the adsorption of Cr(VI) and reduction mechanism dominated the reduction of Cr(VI)–Cr(III).
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高影响因子
AQUATIC TOXICOLOGY
·
2016
·
IF 3.557
Hongxing Chen,Lei Mu,Jinling Cao,Jingli Mu,Paul L. Klerks,Yongju Luo,Zhongbao Guo,Lingtian Xie
Chromium (Cr) is an essential metal and a nutritional supplement for both human and agricultural uses. It is also a pollutant from a variety of industrial uses. These uses can lead to elevated Cr levels in aquatic environments, where it can enter and affect aquatic organisms. Its accumulation and subsequent effects in fish have received relatively little attention, especially for chronic exposure. In the present study, Japanese medaka were chronically exposed to dissolved or dietary Cr(VI) for 3 months. Cr accumulation in liver, gills, intestine, and brain was evaluated. Effects on the antioxidant system, nervous system (acetylcholinesterase, AChE), digestive system (α-glucosidase, α-Glu), and tissue histology (liver and gills) were also assessed. Cr accumulation was observed in the intestine and liver of fish exposed to Cr-contaminated brine shrimp. However, chronic dissolved Cr exposure led to significant Cr accumulation in all organs tested. Analysis of the subcellular distribution of Cr in medaka livers revealed that 37% of the Cr was present in the heat stable protein fraction. The dissolved Cr exposure had pronounced effects on the antioxidant system in the liver, with an elevated ratio of reduced glutathione/oxidized glutathione (GSH/GSSG) and decreases in GSH and glutathione S -transferase (GST). The α-Glu activity in the intestine was significantly inhibited. In addition, Cr exposure caused histopathological alterations in the gills and liver. In general, the effects of dietary Cr were relatively minor, possible due to the much lower accumulation in the fish. Our results imply that Japanese medaka accumulate Cr mainly via uptake of dissolved Cr(VI).
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高影响因子
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