CERAMICS INTERNATIONAL
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2024
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IF 5.1
Yushi Qi,Jiangfan Xu,Yanhan Fei,Lanjun Du,Yan Ren,Wenbo Han,Gang Chen,Zhiming Du
This study investigated the preparation of SiC porous ceramics using an organic foam impregnation-high temperature sintering process. To address the poor wettability of SiC ceramics when used as the reinforcement phase, the surface of SiC porous ceramics was modified with Al 2 O 3 . SiC-Al 2 O 3 /2A50 co-continuous composites were then fabricated by infiltrating 2A50 aluminum alloy into the SiC-Al 2 O 3 porous ceramics under pressure. Microstructural observations, along with friction, wear performance, and thermal stability test, demonstrated that Al 2 O 3 surface modification significantly enhances the friction and wear performance as well as the thermal stability of the co-continuous composites. The prepared SiC-Al 2 O 3 /2A50 co-continuous composite exhibited excellent wear resistance, good thermal stability and stable bonding at heterogeneous interfaces. Compared to 38CrSi steel, the SiC-Al 2 O 3 /2A50 co-continuous composite not only offers the advantage of reduced weight but also shows a significantly lower wear rate of 9.3 × 10 −5 mm 3 /N·min under a 50 N load. These findings suggest that the SiC-Al 2 O 3 /2A50 co-continuous composite has the potential to replace 38CrSi steel as a wear-resistant material.
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WATER ENVIRONMENT RESEARCH
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2024
·Vol. 96
·期 10
·e11146
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IF 2.5
Wenquan Sun,Yiming Xie,Ming Zhang,Jun Zhou,Yongjun Sun
In this work, a Co–Ce@RM ozone catalyst was developed using red mud (RM), a by-product of alumina production, as a support material, and its preparation process, catalytic efficiency, and tetracycline (TCN) degradation mechanism were investigated. A comprehensive assessment was carried out using the 3E (environmental, economic, and energy) model. The optimal production conditions for Co–Ce@RM were as follows: The doping ratio of Co and Ce was 1:3, the calcination temperature was 400°C, and the calcination time was 5 h, achieving a maximum removal rate of 87.91% of TCN. The catalyst was characterized using different analytical techniques. Under the conditions of 0.4 L/min ozone aeration rate, with 9% catalyst loading and solution pH 9, the optimal removal rates and chemical oxygen demand by the Co–Ce catalytic ozonation at RM were 94.17% and 75.27%, respectively. Moreover, free radical quenching experiments showed that superoxide radicals (O 2 − ) and singlet oxygen (1O 2 ) were the main active groups responsible for the degradation of TCN. When characterizing the water quality, it was assumed that TCN undergoes degradation pathways such as demethylation, dehydroxylation, double bond cleavage, and ring-opening reactions under the influence of various active substances. Finally, the 3E evaluation model was deployed to evaluate the Co–Ce@RM catalytic ozonation experiment of TCN wastewater. Practitioner Points The preparation of Co–Ce@RM provides new ideas for resource utilization of red mud. Catalytic ozonation by Co–Ce@RM can produce 1 O 2 active oxygen groups. The Co–Ce@RM catalyst can maintain a high catalytic activity after 20 cycles. The degradation pathway of the catalytic ozonation of tetracycline was fully analyzed. Catalytic ozone oxidation processes were evaluated by the “3E” (environmental, economic, and energy) model.
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ChemistrySelect
·
2024
·Vol. 9
·期 44
·e202403927
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IF 1.9
Hui Han,He Cui,Jiabo Wang,Kai Ge,Yongfang Yang
Graphical In this paper, 2D MOF-Co, 2D MOF-Co/Cu, and 2D MOF-Co/Cu/Fe are designed and prepared using 1,4-benzendicarboxylic acid (1,4-BDC) as organic ligands. Their charge transfer, separation efficiency, and effects on photocatalytic CO 2 reduction are studied. The results show that 2D multimetallic MOF-Co/Cu/Fe has better photocatalytic CO 2 reduction activity, so it has higher research value and development prospect in the field of photocatalytic CO 2 reduction. In this study, 2D multimetallic MOFs combined with the advantages of 2D nanosheets, with the synergetic effect of multimetallic nodes, exhibited good photocatalytic activity for reduction of CO 2 . Herein, a 2D MOF-Co/Cu/Fe were successfully prepared via one-pot stirring of the solutions of multimetal salts and organic ligands at room temperature. Introduction of the second and third metal (Cu and Fe) into MOF-Co does not change the 2D morphology of MOFs, although it improved the photocatalytic CO 2 reduction performance by broadening the light absorption range of 2D MOF-Co, accelerating the separation efficiency and transfer rate of photogenerated carriers. Upon irradiation with full-spectrum light, the average CO yield of 2D MOF-Co/Cu/Fe achieved 17.06 µmol·g −1 ·h −1 , being about 1.8 and 1.2 times that of 2D MOF-Co and 2D MOF-Co/Cu. This work provides an insight into 2D multimetallic MOFs-based photocatalysts in catalytic CO 2 reduction.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Qiqi Zhou,Qi Chen,Wangjie Xu,Feng Wang,Xiaoqing Du,Yufan Zhou,Yulin Zhan,Man Jiang
Carbon electrode material is crucial for the development of electric double-layered supercapacitor in clean energy storage and rechargeable aspects. Although lignin consists the promising biomass based carbon resource for containing higher carbon atom ratio than 60 %, it is still the difficult challenge to precisely tailoring the porous structure characteristics and surface property to facilitate the electrolyte penetration and rapid ion transportation. Herein, the lignin nanotubes (LNT) were successfully synthesized in a convenient molecular self-assembly way, which were subsequently carbonized and activated, with introduction of melamine as nitrogen doping agent, into hetero-atom doped lignin carbon nanotubes (LCNT) as electrode material for supercapacitor. The resultant LCNT exhibit excellent pore structure , and high degree of graphitization. At a current density of 0.5 A/g, the as high specific capacitance as 391.4 F/g was achieved. Furthermore, under symmetric double-layered capacitor electrode systems, the as prepared N, S co-doped LCNT electrode demonstrated a specific capacitance of 28.6 F/g at a high current density of 20 A/g, which presented a practically applicable energy storage efficiency. It has convincingly demonstrate the substantial potential of LCNT as biomass derived carbon materials for electrochemical energy storage devices, positioning them as a promising and competitive candidate for electrode materials.
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LANGMUIR
·
2025
·
IF 3.9
Junsheng Wang,Gege He,Jinke Shen,Xiaozhen Lv,Hongyu Mi,Shun Lu
Transition metal and nitrogen codoped graphitic carbon materials with Co–N bonds serve as key non-noble-metal catalysts for the oxygen evolution reaction (OER). To enhance catalytic efficiency, we explore the anchoring of Co–N bonds on nitrogen-doped graphitic carbon (NC) substrates with varied phosphorus content. The catalyst is synthesized through a straightforward sintering and phosphating process of ZIF@DCA in a tube furnace. X-ray photoelectron spectroscopy (XPS) demonstrated that the Co–N bonds effectively formed an efficient charge transfer channel, removing the barrier that separated the Co–N active site from the work electrode surface. Phosphorus is uniformly distributed across the Co–N substrate, ensuring the exposure of most Co–N active sites during the electrochemical reaction. With favorable structural and electronic attributes, P/Co–N-2 showcases the lowest overpotentials at 10 and 300 mA cm–2, which are 200 and 300 mV, respectively. Additionally, it demonstrates stable performance over 100 h in 1 M KOH, outperforming other similar materials and RuO2. This study offers critical insights for the rational design of Co–N structures, exploring the interplay between structure, composition, and activity in electrochemical reactions.
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Journal of Energy Chemistry
·
2024
·
IF 14
Shilin Fan,Bin Zhu,Xiao Yu,Yang Gao,Weiping Xie,Yong Yang,Jian Zhang,Chunlin Chen
Biomass, derived from plant photosynthesis that captures carbon dioxide to form carbohydrates, offers vast renewable reserves. The electrooxidation of biomass, coupled with the hydrogen evolution reaction, enables the simultaneous production of biomass-based plastic monomers and green hydrogen, attracting significant scholarly interest. However, ambiguity remains regarding the adsorption mechanism at the catalyst surface (Langmuir-Hinshelwood or Eley-Rideal) and the adsorbed substrate groups. To address this, we prepared a Ni/Co electrode for the electrooxidation of 5-hydroxymethylfurfural (HMF) into 2,5-furandicarboxylic acid (FDCA) through a corrosion reaction and electro-reduction pathway. HMF conversion reached 100.00%, FDCA yield reached 96.82%, and Faradic efficiency (FE) reached 92.14%. Meaningfully, utilizing in-situ spectroscopy and electrochemical methods, this work provided valuable insights into active sites and catalyst surface adsorption.
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Molecular Catalysis
·
2024
·
IF 3.9
Xing Gao,Ying Ma,Yingying Ruan,Wenna Zhang,Shihao Zhang,Wenxue Xiong,Dong Tian,Shiliu Yang,Pei Fan,Yanhui Yang,Yihu Dai
Non-noble metal-catalyzed selective C O hydrogenation of α,β-unsaturated aldehydes to corresponding alcohols is chemically atom economic and practically feasible. This work reports hydrotalcite-derived Co-based catalysts for catalyzing aqueous phase selective hydrogenation reaction of cinnamaldehyde to cinnamyl alcohol. The structure characterizations demonstrate the phase transition from hydrotalcite to co-existed CoO x and metallic Co 0 in the optimal Co 2 Al-H 2 -400 catalyst. It exhibits superior catalytic activity and selectivity relative to other as-obtained Co catalysts, because of the synergy effect of Co 2+ sites to promote the adsorptive activation of C O group and small-size Co 0 sites to facilitate the activating dissociation of hydrogen. Furthermore, the catalytic role of water has also been explored. Adopting water as pure solvent and partially adding water into organic solvent can both effectively enhance the activity and selectivity. Such reaction environment may induce creation of more intermolecular hydrogen bonds for promoting the hydrogen transfer and thus boosting the hydrogenation reaction.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2025
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IF 6.1
Weishou Shen,Yang Wu,Futao Li,Shirui Zhang,Hongmei Jin,Bei Gao
Microplastics, as emerging contaminants, can absorb antibiotics, and their coexistence in soil ecosystems poses serious threats to soil health. While previous studies have primarily focused on the individual effects of microplastics or antibiotics, the interactions between these pollutants in soil environments remain poorly understood. In this study, we investigated the combined effects of sulfonamide antibiotics and microplastics—both non-degradable low-density polyethylene and degradable polylactic acid—on soil microbiota and physicochemical properties. Our findings revealed significant changes in soil properties under co-exposure conditions. Dissolved organic carbon emerged as the most influential factor affecting bacterial and fungal diversity. Co-exposure altered the composition of bacterial and fungal communities at both the phylum and genus levels, with soil bacteria showing stronger responses than fungi. Importantly, co-exposure exacerbated the ecological risks associated with individual contaminants. We also observed differences in how non-degradable and degradable microplastics impacted the stability and complexity of microbial community networks. Notably, co-exposure to degradable microplastics and sulfonamides led to a significant increase in the expression of antibiotic resistance genes ( sul1 and int1 ). These findings enhance our understanding of the combined effects of microplastics and antibiotics on soil ecosystems and underscore the need for further research into their ecological risks.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Hongyue Li,Jun Yao,Zhiqiang Peng,Mengyun Yang,Taotao Zhao,Peng Wang,Yupei Zhao
As is well known that, transition metal sulfides often face challenges such as excessive intermediate adsorption and poor electrical conductivity, which greatly limits their use in large-scale water electrolysis. Herein, we prepare a Fe-Co bimetallic synergistic catalyst based on solvothermal method. This catalyst ((FeCo) 9 S 8 /C-1) exhibits excellent oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performance due to multiple synergistic effects. For instance, low overpotentials of 284.7 mV for OER and 310 mV for HER at 10 mA·cm −2 could be reached in 1 M KOH, while the electrochemical active surface area reaches 40.25 m 2 ·g −1 , which is twofold compared to bare Co 9 S 8 . Density Functional Theory (DFT) calculations further reveal the strong charge transfer between Fe and Co would reduce the energy barriers for the rate-determining steps, enhancing the desorption of *OOH and *H intermediates, as well as improving the electrocatalytic efficiency. This study opens new avenue for designing other dual-transition metal sulfides for water splitting with high-performance.
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Materials Today Chemistry
·
2025
·
IF 6.7
Yuansen Xiao,Huimin Li,Zheng Wang,Zhihan Liu,Chenyang Li,Bin Wu,Longfei Yan,Huidong Zheng,Fuweng Zhang
Borneol synthesis faces challenges from co-generated impurities (isoborneol/camphor) and competing dehydration/dehydrogenation during isomerization. Here, Co/TiO 2 is demonstrated as a selective catalyst for isoborneol-to-borneol isomerization, effectively suppressing structural degradation. Controlled acidity and cobalt dispersion are identified as critical factors: TiO 2 's moderate acidity promotes isomerization, while strongly acidic supports (e.g., Mordenite) favor dehydration to camphene. Reduced cobalt particle size enhances active-site accessibility, lowering activation energy and boosting borneol yield. A one-pot two-step process achieves >62 % borneol content with <0.5 % camphor, meeting ChPC purity standards. This strategy bypasses traditional purification bottlenecks, offering a scalable route for high-purity borneol synthesis. The mechanistic insights into acid strength and metal dispersion provide a framework for rational catalyst design in industrial isomerization applications.
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Bioactive Materials
·
2025
·
IF 20.3
Zaiyan Wang,Jianxiang Zhu,Bobin Mi,Ming Ni,Yuming Xue,Yiling Deng,Lu Chen,Xiangyang Xu,Xiaoyan Li,Guohui Liu,Tao Yu
The high invasiveness and metastatic potential of breast cancer increase the risk of postoperative recurrence. To address this issue, a composite hydrogel drug delivery system based on sodium alginate (SA) has been developed for the in situ release of carbon monoxide (CO) at the tumor resection site. This system aims to enhance the effectiveness of chemotherapy and improve the clearance of residual tumor cells after surgery, thereby preventing tumor recurrence and metastasis. A gold nanoparticle-modified g-C 3 N 4 nanophotocatalyst (C 3 N 4 /Au) has been designed to convert CO 2 within the tumor into CO under visible light irradiation. The C 3 N 4 /Au is loaded into an SA hydrogel and applied to the postoperative incision in a spray form. The rapid crosslinking reaction between SA and Ca 2+ forms a network structure, enabling precise drug delivery. CO is generated in situ in the postoperative tumor tissue under light stimulation and is combined with folic acid (FA) modified doxorubicin (DOX) micelles (FA@DM) to achieve effective synergy between CO therapy and chemotherapy. The composite hydrogel drug delivery system not only increases the concentration of CO within the tumor and reduces systemic toxicity but also enhances the effectiveness of chemotherapy by increasing oxidative stress within tumor cells. It provides a new and safe strategy for efficient and precise postoperative tumor treatment, reducing the risk of tumor recurrence and metastasis.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Xiangzhi Wang,Jing Wang,Zelong Li,Muhan Yang,Arbaz Rehman
Pharmaceuticals and personal care products (PPCPs), known for their severe ecological risks, are frequently detected in coastal waters worldwide. However, the environmental fate in marine systems remains poorly understood. This study investigated the co-metabolic degradation mechanism of a typical PPCP, sulfamethoxazole (SMX), by a marine consortium SAB using alginate—a natural organic matter—as a co-substrate, aiming to elucidate the biodegradation process of PPCPs in actual marine environments. An integrated approach, including metagenomic sequencing (with binning), RT-qPCR, molecular docking, metabolic modeling, and metabolomics, was employed. Results demonstrated that the SAB consortium efficiently degraded SMX at concentrations from 50 μg/L to 10 mg/L, achieving over 96% removal within 24 h. SMX degradation was achieved through metabolic cross-feeding of alginate by key species within the SAB consortium. Specifically, alginate is initially converted by Vibrio into the central metabolite 2-keto-3-deoxy-D-gluconate (KDG). KDG is subsequently metabolized by Tritonibacter , Halopseudomonas , and Vibrio , generating key metabolites such as acetyl-CoA, serine, cysteine, and guanine. These metabolites support microbial growth and induce production of SMX-degrading enzymes, such as threonine dehydratase, cysteine S-conjugate β-lyase, and guanine deaminase, leading to SMX cleavage and mineralization. Additionally, acetyl-CoA provides acetyl groups for arylamine N-acetyltransferase-mediated SMX acetylation. These processes collectively drive the co-metabolic degradation of SMX. Overall, this study provides critical insights into PPCPs' fate in marine environments.
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