ChemElectroChem
·
2017
·Vol. 5
·期 2
·242-246
·
IF 4.136
Mei Guo,Chaochao Qiu,Yu Li,Xiuyan Jin,Guoxin Zhang,Xiaoming Sun
Herein, defect-rich graphene oxide with a crumpled form was fabricated through the fast thermal expansion of H 2 SO 4 -intercalated graphite oxide. The fast removal of intercalated H 2 SO 4 molecules and by-product gases result in the formation of crumpled edges, whereas the partial reduction of H 2 SO 4 leads to a large amount of defects and minor S doping (ca. 0.55 at%). The expanded graphene oxide with a crumpled form and rich defects was used as electrode materials for the oxygen reduction reaction (ORR), and a very high ORR performance was observed in 0.1 mol L −1 KOH, exhibiting an onset potential of 0.92 V, a half-wave potential of 0.83 V, and a roughly 5.68 mA cm −2 limiting current density with catalyst loading of 0.1274 mg cm −2 . Our work provides reliable GO-based catalyst materials for the ORR; moreover, it will expand the knowledge one type of high-activity site for the ORR: defects on crumpled edges. Graphical In a crump : Defect-rich crumpled graphene oxide (CGO) is fabricated by using a modified Hummers method, followed by fast thermal treatment. Abundant defective and doping sites are created, presenting on the crumpled edges. Highly comparable oxygen reduction reaction performance of the CGO is demonstrated relative to commercial Pt/C.
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高影响因子
RENEWABLE ENERGY
·
2024
·
IF 9
Ying Xu,Dongling Wang,Bowen Luo,Xiaodong Zhang,Yuanbo Huang,Huanghuang Zhuang,Riyang Shu
An efficient hydrogenolysis for organosolv lignin was proposed by using Co/C coupled with NaOH catalyst in this work. A boosted aromatic monomer yield was achieved, which was superior to the noble metal-based catalysts. The optimal 15%Co/C catalyst coupled with NaOH exhibited the best hydrogenolysis performance, with lignin conversion of 94.5 % and aromatic monomers yield of 43.4 %. Wherein, the product of benzyl alcohols showed the highest yield 23.5 %. The recycling performance of 15%Co/C catalyst was outstanding, with lignin conversion above 92.8 % after three runs and the yield of aromatic monomer slightly dropped to 38 %. The hydrogenolysis reaction pathway was also investigated based on the β-O-4 dimer model compound study. 2-(2-methoxyphenoxy)-1-phenyl ethanol was selected as lignin β-O-4 dimer model compound, and the hydrogenolysis reaction was conducted efficiently at 160 °C under the synergistic catalysis effect of metal sites and base sites. NaOH promoted the initial depolymerization of lignin through protonation, which improved the accessibility of lignin product to Co/C catalyst, and thus enhanced the reactivity of catalytic hydrogenolysis. NaOH also facilitated the etherification of intermediate products with solvents. And the presence of Co metal site stabilized free radicals and inhibited monomer product etherification. This catalytic system provides a potential strategy for the large-scale lignin utilization, with the advantage of high efficiency and handleability.
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Journal of Materials Chemistry A
·
2016
·Vol. 5
·期 3
·952-957
·
IF 8.262
Kui Zhou,Bibimaryam Mousavi,Zhixiong Luo,Shophot Phatanasri,Somboon Chaemchuen,Francis Verpoort
A novel Zn/Co zeolitic imidazolate framework (ZIF) has been constructed by an easy and straightforward room temperature technique. Several characterization techniques such as SEM, TEM-EDX, single-crystal XRD and ICP have been applied to confirm that the structure formed is a sodalite (SOD) cage type structure. The Zn/Co-ZIF possesses a high nano-crystallinity and porosity with a large surface area. By tuning the amount of Co and Zn in the Zn/Co zeolitic imidazolate framework, the physical and chemical properties have been improved compared with those of the single metal frameworks (ZIF-8 and ZIF-67). Consequently, the Zn/Co-ZIF was investigated for two different applications; gas adsorption (CO2, CH4 and N2) and catalysis (CO2 conversion to cyclic carbonates) and the obtained results were compared with the performance of previously reported single metal frameworks (ZIF-8 and ZIF-67). Additionally, hydrolytic stability tests under ambient conditions and immersed in water at 75 °C were performed and pointed out that Zn/Co-ZIF exhibits a higher stability. Moreover, based on these results, the Zn/Co-ZIF demonstrates better properties compared with ZIF-8 and ZIF-67.
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高影响因子
JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Somboon Chaemchuen,Xuan Xiao,Marzieh Ghadamyari,Bibimaryam Mousavi,Nikom Klomkliang,Ye Yuan,Francis Verpoort
A robust catalyst generated from the pyrolysis of bimetallic Zn/Co-ZIF comprising magnetic properties demonstrated to be an effective heterogeneous catalyst system for CO 2 conversion reaction without the need of co-catalyst and solvent. Controllable pyrolysis under various conditions resulted in a unique active structure composed of metallic particles stabilized in a nitrogen-doped carbon matrix. The metallic particles acting as acid sites are dispersed in a nitrogen-doped porous carbon-wall which provides the basic sites. These sites are created during the pyrolysis process of Zn/Co-ZIF used as a special template under a controlled atmosphere. The resulting material possessing both, acid and basic sites, showed an excellent catalytic performance for the cycloaddition of CO 2 into epoxides as these sites correspond to the active sites in the catalytic cycle. Additional, the pyrolysis conditions indicated to play an important role in the properties of the resulting materials and in parallel with the catalytic performance. The catalytic material proved to be very robust and maintained high activities for at least eleven cycles using the optimized reaction condition. Moreover, the magnetic property of the resulting catalyst is advantageous especially for the separation from the reaction mixture.
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OPTICAL MATERIALS
·
2020
·
IF 2.779
Yingying Wei,Lin Chen,Junli Wang,Xuguang Liu,Yongzhen Yang,Shiping Yu
In order to avoid the interference of autofluorescence and improve tissue penetration capability of carbon quantum dots (CQDs) in biological imaging, the synthesis of long-wavelength emission CQDs was achieved in this work. Boron and nitrogen co-doped CQDs (BN-CQDs) were synthesized by one-step microwave assisted hydrothermal method with o -phenylenediamine as carbon and nitrogen source, boric acid as boron source. The BN-CQDs (QY = 13.79%) synthesized under the optimal conditions exhibit excitation independence, a large Stoke shift, satisfactory fluorescent stability, good biocompatibility and low toxicity, which can meet the basic requirements as cell imaging agent. Cell imaging measurements prove their increased intracellular accumulation with the extension of incubation time with HeLa cells, and clearly observable BN-CQDs imaging for cell morphology. Hence BN-CQDs can be used as a good cell imaging agent.
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OPTICAL MATERIALS
·
2026
·
IF 4.3
Qingyuan Niu,Penghui Ma,Feng Luo,Xingyu Liu,Shuxin Yin,Xin Huang,Yumin Song
Red fluorescent powder has important applications in various fields such as display and lighting. In this paper, Eu 3+ /Nb 5+ co-doped SrTiO 3 fluorescent material was synthesized by hydrothermal method, and its phase structure, microstructure, luminescence properties, thermal stability and luminescence dynamic characteristics were systematically characterized. The results showed that under 395 nm near-ultraviolet excitation, the material emitted high-purity Eu 3+ characteristic red light at 612 nm; when the Eu 3+ doping content was 7 mol% and Nb 5+ was 3.5 mol%, the luminescence intensity was increased by 259% compared with single-doped Eu 3+ ,and the absolute quantum efficiency increased. Nb 5+ plays a dual role in this process, namely charge compensation and energy transfer modulation: On one hand, it inhibits the formation of lattice defects through charge balance between sites; on the other hand, it constructs an efficient light absorption center, enabling ultrafast energy transfer from the matrix to Eu 3+ . This material has stable color properties within the temperature range of 303-463 K, with no obvious color shift, and the thermal quenching activation energy is 0.34 eV, showing excellent thermal stability. This efficient and stable red fluorescent powder prepared by the Eu 3+ /Nb 5+ co-doping strategy has broad application prospects in near-ultraviolet excitation high color rendering index white LED and anti-counterfeiting encryption fields.
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CONSTRUCTION AND BUILDING MATERIALS
·
2026
·
IF 8.9
Shibo Zhang,Jun Xie,Shaopeng Wu,Sihui Peng,Derun Zhang,Fusong Wang
The rapid elimination of free calcium oxide (f-CaO) is critical for the large-scale utilization of steel slag (SS). To address this, an acrylic acid-vinyl phosphonic acid copolymer (AA-co-VPA) with high Ca²⁺ chelating capacity was utilized in this study. The chelation mechanism of AA-co-VPA with f-CaO and the modification mechanism regarding the microscopic properties and volume stability of SS were systematically investigated via SEM-EDS, XPS, FTIR, and CT scanning. On this basis, a systematic performance validation was conducted, spanning from aggregates and asphalt mastic to the asphalt mixture. The results indicated that AA-co-VPA exhibited exceptional Ca²⁺ chelation performance attributed to its unique bifunctional molecular structure, achieving a chelation capacity of 375 mg/g. At the optimal modification concentration of 1.0%, the immersion expansion rate of the AA-co-VPA modified steel slag (AAVPA-SS-1.0) significantly decreased from 3.76% for unmodified SS to 0.37%, and its f-CaO content was lowered to 0.44%. Microstructural analysis revealed that the proportion of micropores smaller than 100 μm in AAVPA-SS-1.0 was reduced by approximately 90%, leading to synchronous improvements in water absorption and mechanical properties. Rheological tests demonstrated that substituting mineral fillers with the filler (AAVPA‑SSP) prepared from AAVPA‑SS‑1.0 significantly enhanced the elastic recovery and high-temperature resistance to permanent deformation of the asphalt mastic. Finally, the resulting modified steel slag asphalt mixture (AAVPA-SSAM) exhibited excellent pavement performance, with an immersion expansion ratio of only 0.51%, far lower than the 2.82% of the asphalt mixture with unmodified steel slag (SSAM). While effectively addressing the volume stability issue, its water stability and high-temperature rutting resistance were superior to those of both the basalt asphalt mixture (BAM) and SSAM, and its low-temperature cracking resistance met specification requirements.
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Yang Wang,Cuilian Sun,Tianxing Wu,Xiujing Xing,Wei Xiong,Hao Li
The electrocatalytic nitrite reduction reaction (NO 2 RR) converts harmful nitrite in aqueous media into high value-added ammonia (NH 3 ) under mild conditions, representing a promising technology that integrates environmental remediation and green NH 3 synthesis. However, the NO 2 RR undergoes a complex process involving multi-electron/proton transfer steps. Cu-based catalytic systems are universally plagued by the inherent bottleneck of insufficient activity and selectivity, and these dual constraints can hardly be simultaneously overcome by single-element doping alone. Herein, we fabricated fluoride and cobalt co-doped Cu 2 (OH) 2 CO 3 nanosheet catalysts via a one-step hydrothermal method, where the synergistic effect between anionic and cationic dopants enables the simultaneous tailoring of the electronic structure and active site distribution of the material. Electrochemical test results demonstrate that F and Co co-doping can significantly boost the NO 2 RR catalytic performance of Cu 2 (OH) 2 CO 3 . The optimal F-3 sample achieves the highest NH 3 Faradaic efficiency (FE) of 96.47% with an NH 3 yield rate of 28.55 mg h −1 mg cat -1 at −0.8 V (vs. RHE) in 0.15 M NaNO 2 neutral electrolyte, showing a nearly 2-fold performance improvement over the undoped counterpart and outperforming most reported non-noble metal NO 2 RR electrocatalysts. This work provides a high-performance NO 2 RR electrocatalyst for neutral aqueous systems, and demonstrates that anion-cation synergistic doping can break the intrinsic performance bottleneck of Cu-based hydroxyl compounds, offering a valuable modification strategy for rational catalyst design towards electrocatalytic nitrogen-containing pollutant conversion.
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APPLIED CLAY SCIENCE
·
2026
·
IF 5.2
Yi Wei,Lu Chen,Yichun Wang,Yanqi Xu,Linjiang Wang,Wenbin Yu,Cunjun Li
The low bioavailability of nutraceuticals, due to chemical instability and non-targeted release, remains a major delivery challenge. To address this, biodegradable core-shell hydrogel microspheres with controllable diameters ranging from 800 to 2850 μm were fabricated via an extrusion method for the co-delivery of hydrophilic and hydrophobic nutraceuticals. These microspheres employ Fe 2 O 3 -loaded montmorillonite (Fe Mt) as the reinforcing scaffold, sodium carboxymethyl cellulose (CMC) as the core, and chitosan (CS) as the shell. They were co-loaded with hydrophilic l -glutamine (L-Gln) and hydrophobic curcumin (Cur) as model nutraceuticals. The incorporation of Fe Mt overcomes the low encapsulation efficiency and mechanical weakness of polymer microspheres. Meanwhile, at Fe Mt contents of 6.00 wt% (for L-Gln) and 5.00 wt% (for Cur) relative to the CMC weight, the encapsulation efficiencies reach up to 75.42% and 63.16%, respectively. The CS shell thickness increases from 10.83 to 16.05 μm as the CS concentration rises from 10.0 to 25.0 g/L. This thickness governs the release kinetics and pH-responsive behavior, wherein the microspheres contract in acidic environments and swell under neutral/alkaline conditions to facilitate targeted delivery in the gastrointestinal tract. In simulated digestion, cumulative release of nutraceuticals from the microspheres was 93.02% for L-Gln and 88.37% for Cur within 12 h. Additionally, the microspheres exhibited good storage stability (ca. 1.03% loss after 45 days). This work presents a highly promising and versatile platform for the co-delivery of hydrophilic and hydrophobic nutraceuticals with controlled release profiles.
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JOURNAL OF FLUORESCENCE
·
2026
·
IF 3.4
Liu Xiujin,Lai Gengneng,Shu Zongcheng,Li Wei,Ke Fang
Thyroid-associated ophthalmopathy (TAO) is a complex autoimmune inflammatory disease. There is an urgent clinical need for highly sensitive and minimally invasive biomarkers to enable early diagnosis and dynamic disease monitoring. Among them, miR-320a has been confirmed to be closely associated with oxidative stress regulation, fibroblast activation, and fibrosis progression. However, current detection methods, especially those based on real-time quantitative polymerase chain reaction (RT-qPCR), still suffer from cumbersome procedures, high instrumentation costs, and limited adaptability for rapid point-of-care diagnostics. To address this, we developed a nanozyme-assisted colorimetric biosensing platform integrating target-triggered probe hybridization with Co-g-C 3 N 4 , which exhibits enhanced peroxidase-like activity and stability. The method involves Co-g-C 3 N 4 synthesis, probe-nanozyme interface construction, catalytic optimization, and colorimetric detection via TMB oxidation, validated in spiked serum and with smartphone readout. The platform achieves sensitive miR-320a detection down to picomole levels with excellent linearity and specificity. In spiked human serum analysis, it reliably quantifies endogenous miR-320a with strong recovery rates (94.6-108.9%). However, we acknowledge that direct clinical validation using confirmed TAO patient samples is required for full diagnostic implementation, and this represents a limitation of the current study. Generally speaking, this work provides a portable, cost-effective, amplification-free colorimetric nanozyme platform for miRNA detection, requiring only basic laboratory equipment, and holding significant promise for point-of-care precision diagnostics in autoimmune and fibrotic diseases.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Tianyu Li,Mengna Zhan,Rongkun Jiang,Yiqing Zeng,Shule Zhang,Zhaoxiang Zhong
CuO-based catalysts have garnered significant attention for CO oxidation reaction, while their susceptibility to sulfur poisoning limits their practical application in industrial flue gas treatment. In this study, three CuTi oxide catalysts with distinct CuO-TiO 2 heterointerfaces were prepared by sol-gel, impregnation, and mechanical mixing methods to investigate the influence of interfacial structure on CO oxidation activity and SO 2 tolerance. Catalytic performance and characterization show that a high-density CuO-TiO 2 heterointerface can induce the formation of strong Cu Ti interactions and improve the dispersion of copper species. These effects facilitate CO adsorption and increase oxygen vacancy concentration, thereby enhancing the low-temperature CO oxidation activity. Although the high-density heterointerface enhances SO 2 adsorption capacity, the accompanying strong Cu Ti interaction reduces the stability of copper sulfate (Cu-O-S) species. This promotes the decomposition of copper sulfate and helps preserve active sites, thus improving SO 2 tolerance. This work offers new insights into the rational design of sulfur-tolerant CuO-based catalysts for CO oxidation.
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高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2026
·
IF 2.5
Renfan Chen,Zhen Wang,Wenpu Zhang,Weilong Wu,Kunxi Huang,Hongbin Wang,Yaohui Yang,Kaile Zhao
The efficient recovery of strategic cobalt (Co) and nickel (Ni) from complex secondary resources is crucial for resource security. This study addresses a key bottleneck hindering short-process all-flotation routes: the difficulty in direct separation of reagent-coated sulfur-cobalt bulk concentrate derived from pre-concentrated vanadium titanomagnetite tailings. A synergistic reagent system featuring a calcium-based composite modifier (CCM) and a mercapto-based depressant (3-MP) was developed, enabling flotation separation of industrial reagent-laden sulfide feed without any pretreatment. In laboratory closed-circuit tests, a Co-Ni concentrate assaying 2.16% Co and 4.95% Ni was produced from 0.35% Co feed, with 80.82% Co and 79.65% Ni recoveries and a Co/S selectivity coefficient of 5.9, which compares favorably with traditional pretreatment-dependent processes. The process was scaled up to a 30,000 tonne per annum industrial production line. Stable operation yielded a Co-Ni concentrate (1.82% Co, 4.35% Ni), salable sulfur concentrate with sulfur content of no less than 30%, and confirmed simultaneous copper recovery. This work offers a practically and industrially tested framework for short-process clean recovery of critical metals from sulfide ores.
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