Frontiers in Microbiology
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2024
·
IF 4
Liu Chenglong,Wen Xueer,Pan Huiqiao,Luo Ying,Zhou Junyang,Wu Yuzhe,Zeng Zhiyong,Sun Ting,Chen Jun,Hu Zhangli,Lou Sulin,Li Hui
Cobalt pollution is harmful to both the aquatic ecosystem and human health. As the primary producer of aquatic ecosystems in hypersaline environments, unicellular planktonic Dunaliella microalgae is considered to be a low-energy and eco-friendly biosorbent that removes excess cobalt and enhances the vitality of coastal and marine ecosystems. In this study, we found that the halotolerant microalga named Dunaliella sp. FACHB-558 could grow under a salinity condition with 0.5–4.5 M NaCl. A phylogenetic analysis based on the rbcL gene revealed that Dunaliella sp. FACHB-558 is a close relative of Dunaliella primolecta TS-3. At lab-scale culture, Dunaliella sp. FACHB-558 exhibited high tolerance to heavy metal stresses, including cobalt, nickel, and cadmium. Treatment with 60 μM cobalt delayed its stationary phase but ultimately led to a higher population density. Furthermore, Dunaliella sp. FACHB-558 has the ability to adsorb the cobalt ions in the aquatic environment, which was evidenced by the decreased amount of cobalt in the culture medium. In addition, the tolerance of Dunaliella sp. FACHB-558 to cobalt stress was correlated with enhanced nitric oxide content and peroxidase activity. The autophagy inhibitor 3-MA enhanced nitric oxide burst, increased peroxidase activity, and accelerated the bioremoval of cobalt, suggesting that the autophagy pathway played a negative role in response to cobalt stress in Dunaliella sp. FACHB-558. In summary, our study identified a novel microalga possessing high cobalt tolerance and provided a promising natural biosorbent for the research and application of heavy metal bioremediation technology.
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高影响因子
ChemCatChem
·
2025
·
IF 3.9
Yuwen Wang,Xuan Zhang,Yajuan Wei,Jingbo Zhang
Cu-based tandem catalysts have been widely studied due to their excellent performance in electrocatalytic reduction of carbon dioxide (CO2RR) to produce C2+ products. However, during the CO2RR process, Cu atoms face the issue of dynamic restructuring, resulting in relatively poor stability and single-product selectivity. Herein, Cobalt phthalocyanine (CoPc) was integrated with Cu nanoparticles (NPs) to prepare a tandem catalyst (Cu/CoPcx) by in-situ growth method, significantly enhancing the selectivity of Cu-based catalysts for C2+ products. The optimal material, Cu/CoPc0.004, achieved a Faradaic efficiency (FE) of 73.17% for C2+ products, with a C2+ product current density exceeding 377 mA/cm2. More importantly, tandem catalyst Cu/CoPc0.004 exhibits high selectivity for ethylene, achieving a FE of 52.35% at -1.26 V (versus reversible hydrogen electrode) with a high ethylene current density (270 mA/cm2). The experimental results indicate that the interaction between CoPc and Cu NPs introduces numerous oxygen vacancies and stabilizes the presence of Cu+. Moreover, the unique structure of the cascade catalyst enables CoPc to provide a large amount of CO intermediates for Cu active sites, thus promoting C-C coupling and facilitating the formation of C2+ products.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Zijun Sun,Zhen Li,Yi Kuang,Chunrong Su,Shuangwei Yu,Yujing Wang,Xiong He,Jinghua Liu
Severe charge recombination and poor surface water oxidation kinetics are key restrictions of BiVO 4 photoanode for efficient photoelectrochemical (PEC) water oxidation. In order to overcome this issue, we introduce Co@β-cyclodextrin (Co@β-CD) supramolecule as oxidation evolution catalyst (OEC) into BiVO 4 photoanode for the first time via a facile two-step immersion method. The optimal Co@β-CD/BiVO 4 photoanode displays a remarkable photocurrent density of 5.3 mA cm −2 at 1.23 V RHE , which is ca. 3.5 times as high as that of pristine BiVO 4 photoanode. Further analyses indicate that photogenerated holes could quickly transfer from BiVO 4 to Co sites through β-CD, thereby suppressing charge recombination. Moreover, due to the spatial confinement effect of β-CD, the dispersed Co sites in Co@β-CD are considered to possess the high catalytic activity in similar with single-atom catalyst, which accelerates the surface water oxidation kinetics. This work not only demonstrates the superiority of supramolecule/semiconductor composite photoanode, but also provides a facile preparation route for the large-scale preparation of high-performance photoanodes.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Shuqing Ma,Chunyan Ding,Zhuoyang Li,Yu Ma,Xiaozhen Ren,Songsong Wu,Shan Gao,Chuncheng Wei,Weiwei Zhou,Guangwu Wen,Xiaoxiao Huang
Three-dimensional (3D) porous carbon has sufficient specific surface area and anchor positioning points. The pore structure facilitates uniform charge distribution, and buffers volume changes during stripping. However, single carbon materials have limited theoretical capacity and short cycle life. Here, 3D porous carbon material BCN/Mn-6 (B,N and Mn co-doped porous carbon with 6 mmol Mn content) co-doped with manganese, boron and nitrogen was synthesized by heat treatment. Affective modulation of the material structure and surface functional groups was achieved by adjusting the amount of manganese doping. The metal element doping can promote the diffusion of lithium ions , and the formed vacancies and defects can be used as lithium storage sites. Nitrogen doping can improve the dispersion and stability of metals and oxides , and regulate the redox capacity. Co-doping of metals and heteroatoms synergistically improves electrical conductivity . Thus, BCN/Mn-6 exhibits excellent cycling stability (99.60 % Coulombic efficiency after 300 cycles) and specific capacity (779.9 mAh/g), and shows capacity rise. This study provides a new direction for the preparation of carbon-based electrode materials doped with heteroatoms and the study of capacitive energy storage mechanisms.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shaodong Xu,Yuan Yu,Dongfeng Sun,Yanning Qu,Linyin Huang,Yuhao Fan,Nandong Li,Pengpeng Qiang,Qingmei Su,Xiaodong Hao,Gaohui Du,Kai wang,Bingshe Xu
High reflection loss and wide absorption bandwidth materials are in great demand to prevent electromagnetic pollution and military applications. The composites prepared by combining different components with good dielectric and magnetic losses are expected to achieve ideal absorbing performance. In this study, a composite of cobalt nanoparticles enveloped in nitrogen-doped bamboo-like carbon nanotubes (Co@N-CNTs) was prepared by one-step annealing the mixture of melamine and cobalt nitrate at 800 °C in a mixed atmosphere of hydrogen and argon. Co nanoparticles derived from the reaction between H 2 and cobalt nitrate during the sintering process were used as catalysts to prompt the carbonization of melamine and the formation of the bamboo-shaped N-doped carbon nanotubes, thus forming the composite structure of bamboo-shaped N-doped carbon nanotubes encapsulated with Co nanoparticles. This Co@N-CNTs composite not only had an excellent dielectric loss and magnetic loss but also greatly improved its impedance matching, thus having good electromagnetic wave absorption performance. The coating made from the Co@N-CNTs composite had a maximum reflection loss (RL) of −35.89 dB at only 1.8 mm thickness at 14.1 GHz and possessed an effective absorption bandwidth of up to 4.91 GHz (12.35–17.26 GHz), suggesting it a high-performance and wide-absorption bandwidth composite material.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Zhiang Hou,Jinzhu Yue,Hao Chen,Jinnan Wang,Aimin Li,Philippe François-Xavier Corvini
Endocrine disrupting chemicals (EDCs) interfere with the normal secretion, transport and metabolism of human hormones, thus affecting neurological, reproductive and immune functions. Photocatalysis is regarded as a facile organic degradation technique. The construction of heterojunctions can modulate the reactive oxygen species and enhance the photocatalytic performance of semiconductors. However, poor contact interfaces still severely limit carrier separation and transfer. Herein, we have doped Co to modulate the band structure of Bi 2 O 2 CO 3 while facilitating the in situ growth of BiOI on its surface via shared Bi atoms. This approach led to the development of a 2D/2D Co-Bi 2 O 2 CO 3 /BiOI (Co-BOC/BiOI) S-scheme heterojunction characterized by atomically close contact interfaces. Furthermore, the photo-electrochemical characterization results indicate that the light adsorption capacity, carrier separation and transport efficiency of the optimized Co-BOC/BiOI-3 are greatly improved. This system demonstrates almost 100% removal rate for three typical EDCs within 60 min. The degradation kinetic constants show an improvement by an order of magnitude compared to single BiOI and Bi 2 O 2 CO 3 . More importantly, O 2 •﹣ , which is produced from O 2 reduction on high negative conduction band, can be subsequently oxidized into 1 O 2 by photogenerated hole. Electron paramagnetic resonance and quenching experiments indicate that the organics degradation process is dominated by 1 O 2 . This work offers new insights into the construction of high-quality S-scheme heterojunction interfaces for modulation of reactive oxygen species.
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Progress in Natural Science-Materials International
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2024
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IF 4.8
Ping-an Yang,Rui Cai,Haibo Ruan,Nanqing Zhang,Xin Huang,Rui Li,Yuxin Zhang,Yi Lu,Zhihao Zhou
Controlled fabrication of materials by surface modification techniques has been a hot research topic. In this paper, one-dimensional (1D) core-shell structure Fe@Co nanowires (NWs) were successfully prepared by anchoring 0-dimensional (0D) Co nanoparticles on 1D Fe NWs based on the in situ reduction method. The electromagnetic parameters of the specimens at a filler mass fraction of 25 wt% were tested and the microwave loss mechanism was deeply analyzed. Binary magnetic metals in a core-shell structure have excellent multi-band microwave absorption capability (S-band, X-band and Ku-band). This is due to the heterogeneous interface and magnetic coupling effects tuning the dielectric and magnetic loss. This study offers a workable plan for creating effective multi-band magnetic metal-based microwave absorbers.
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JOURNAL OF HAZARDOUS MATERIALS
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2025
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IF 11.3
Dianji Ding,Jiao Fei,Yong Yao,Yanji Jiang,Huimin Sun,Xianqiang Yin
Quantum dots (QDs), emerging semiconductor nanomaterials, have been detected in various environmental media and can adsorb co-existing contaminants (e.g., Pb 2+ ). Surface modifications aimed at enhancing the performance of QDs can significantly affect their physicochemical properties, but their effects on QDs environmental behavior remain unclear. Herein, we investigated the adsorption and co-transport behaviors of aminated (NQD), hydroxylated (OQD), and carboxylated cadmium sulfide QDs (CQD) with Pb 2+ via batch adsorption and quartz sand column experiments. The influence of ionic strength (IS) and cation valence on the co-transport of QDs and Pb 2+ was examined. Our experimental findings revealed that Pb 2+ inhibited the mobility of OQD and CQD but enhanced the transport of NQD due to the surface complexation and cation bridging effects. This promoting effect was weakened with increasing IS and cation valence, indicating the involvement of non-Derjaguin-Landau-Verwey-Overbeek forces. Furthermore, OQD and CQD with high mobility and strong affinity to Pb 2+ effectively promoted the transport of Pb 2+ , with CQD exhibiting a more pronounced effect than OQD. Conversely, NQD reduced Pb 2+ efflux due to their lower mobility and stronger adsorption to Pb 2+ . These results provide valuable insights into the role of surface modifications on QDs and their interactions with co-existing contaminants in subsurface environments.
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高影响因子
Energy Technology
·
2024
·Vol. 12
·期 7
·2400062
·
IF 3.6
Demin Jiang,Huina Chen,Liangjuan Zhu,Wei Wang,Yuqiao Wang
Biofouling of air cathode surface decreases the electricity generation performance of membrane-free microbial fuel cells (MFCs). Ag@Co/Zn N-doped carbon (Ag@Co/Zn-NC) is designed as an antibacterial oxygen reduction reaction (ORR) catalyst to inhibit biofouling on the cathode surface. The Co/Zn-NC active component promotes ORR catalytic activity through the advantages of well-distributed Co nanoparticles and numerous active sites. Superficial Ag nanoparticles act as antibacterial active species to inhibit bacterial proliferation and suppress biofilm growth. Ag@Co/Zn-NC catalyst prevents bacterial adhesion and biofilm formation, effectively preventing excessive biofouling on the cathode surface. The antibacterial catalyst maintains a high catalytic activity and good ion diffusion properties without the adverse effects of biofouling, resulting in enhanced ORR durability of the air cathode. The assembled MFCs achieve high electricity generation during long-term cyclic operation. The maximum power density retention percentage (82.6%) is higher than that of Co/Zn-NC MFC (65.3%) and Pt/C MFC (52.4%) after continuous operation for 1200 h. Excellent operational durability is revealed for the air-cathode MFCs assembled with the antibacterial ORR catalyst during the cyclic process. The novelty of this study is that the design of antibacterial catalysts inhibits the excessive growth of the cathode biofilm to improve the cyclic electricity generation performance of MFCs.
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Catalysis Science & Technology
·
2024
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IF 4.4
Huangdong Wang,Zhihua Guo,Heng Zhang,Lin Jia,Min Sun,Lifeng Han,Haorun Li,Yan Guo,Shanghong Zeng
Arranging the active ingredients on the support surface at the molecular or atomic scale to create high-selectivity sites for the electrocatalytic CO2 reduction reaction (CO2RR) holds great promise, which is highly challenging. In this study, we report a strategy for constructing a bimetallic Ag–Ni electrocatalyst with Ni nanoparticles for H2O dissociation, as well as Ni atoms in the carbon skeleton and Ag nanoparticles on the surface for the CO2RR. These sites synergistically enable high selectivity for improving the conversion of CO2 to CO. Specifically, the FECO reaches 99.3% on Ag–Ni/CB at −0.8 V vs. RHE, and its FECO can be maintained over 95.8% in the potential range from −0.8 to −1.1 V vs. RHE. Our research presents an approach for alignment of bifunctional two-component active sites on the surface of a carbon support.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2012
·
IF 4.054
Ying Liu,Dong-Ping Wang,Yu-Xiang Yu,Wei-De Zhang
Functional carbon nanotubes (CNTs) were incorporated into Ti-doped Fe 2 O 3 thin films by a facile, one-step co-electrodeposition method. The films were characterized by X-ray diffraction, scanning electron microscopy, UV–visible absorption, and X-ray photoelectron spectroscopy. The introduction of CNTs results in a better absorption in visible region and greatly enhances the photoelectrochemical properties of the Ti–Fe 2 O 3 films. The improved photoelectrochemical properties of the CNTs and Ti co-doped Fe 2 O 3 films are due to the charge equilibration which interplays between the Ti–Fe 2 O 3 and CNTs. The effect of CNTs to mediate fast charge transfer and to retard charge recombination rate in the composites is also demonstrated by kinetics analysis and electrochemical impedance spectroscopy . The influence of different groups-modified CNTs and different content of CNTs was also studied. The highest photocurrent is 4.5 mA/cm 2 at 1.23 V (vs. RHE) obtained by incorporating 0.10 mg/mL amino-group modified CNTs in the Ti–Fe 2 O 3 film. The amino-functionalized CNTs doped film exhibits the highest photoelectric response compared with those doped by the pristine and acid-treated CNTs under the same conditions, which can be ascribed to the better hydrophilicity and dispersibility of the amino-functionalized CNTs.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2011
·Vol. 124
·期 6
·4678-4685
·
IF 1.24
Ying Chen,Yongbing Chen,Jingya Nan,Chunpeng Wang,Fuxiang Chu
A convenient approach has been developed for the preparation of microsize hydrogels composed of crosslinked poly(acrylic acid) (PAA) and poly( N -isopropylacrylamide) (PNIPAm). First, semi-interpenetration polymer networks of hydropropylcellulose (HPC) and PNIPAm- co -PAA copolymer are formed through the copolymerization and crosslinking of monomer acrylic acid and N -isopropylacrylamide in HPC aqueous solution. After the selective removal of HPC from networks due to ionization of PAA units and disruption of hydrogen bonding with increasing pH, PNIPAm- co -PAA microgels are obtained, whose volume is confirmed to be responsive to both temperature and pH. Doxorubicin hydrochloride (Dox) can be encapsulated in PNIPAm- co -PAA microgels with high drug loading driven by the electrostatic interaction, and a sustained-release characteristic of Dox from the microgels is observed under physiological pH value and temperature. In vitro cell experiments, the drug-loaded microgels can be taken up by LoVo cells and release their payload in cell cytoplasm without loss of drug efficacy. This indicates that PNIPAm- co -PAA microgels might be a potential drug delivery carriers especially for water-soluble or polypeptide drugs. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
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