APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Xiaoyu Li,Yujia Han,Yike Huang,Jian Lin,Xiaoli Pan,Ziang Zhao,Yanliang Zhou,Hua Wang,Xiaofeng Yang,Aiqin Wang,Lin Li,Botao Qiao,Xiaodong Wang
Selective methanation of CO (SMET) is promising for deep removal of low-concentration CO in excess H 2 . However, the development of suitable catalysts applied in practical conditions remains a great challenge. Here we report a general strategy to develop highly efficient SMET catalysts by using hydrogenated TiO 2 (H-TiO 2 ) as support. The H-TiO 2 supported Ru catalysts can remove CO to below 10 ppm with greater than 50 % selectivity in a wide temperature range of 200−265 °C, with a good long-term stability. Detailed characterizations including operando spectroscopy and in-situ XPS combined with DFT calculation revealed that the lowered Ru valance on H-TiO 2 strengthens CO adsorption on both metal surface and metal-support interface which improved CO activation and inhibited CO 2 hydrogenation, respectively, leading to enhancement of both activity and selectivity.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Xinyue Ma,Jianjun Du,Hao Sun,Fenghui Ye,Xin Wang,Pengfei Xu,Chuangang Hu,Lipeng Zhang,Dong Liu
Efficient and cost-effective electrocatalysts for CO 2 reduction with high selectivity are desirable but remain challenging. Herein, a low-cost and efficient electrocatalyst composed of boron, nitrogen co-doped mesoporous carbon (BNMC) for CO 2 reduction reaction (CO 2 RR) along with the catalytic mechanism are reported. The resultant BNMC (i.e., BNMC-1000) exhibits good CO 2 RR activity with high Faradaic efficiency (FE, 95%) towards CO at low overpotential (423 mV). It is demonstrated that the codoping of nitrogen and boron atom, and the mesopore structure are favorable to the excellent catalytic activity of CO 2 RR. The doped boron atom cooperate with nitrogen atom could adjust the projected density of states of the carbon active site generating a proper adsorbed energy of *COOH and *CO on the carbon surface. This work offers a basic guide for developing metal-free carbon-based CO 2 RR electrocatalysts with high-performance.
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高影响因子
Molecular Catalysis
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2021
·
IF 5.062
Jing Cao,An Li,Yicen Zhang,Linchao Mu,Xi Huang,Yankun Li,Tao Yang,Cen Zhang,Congshan Zhou
To prepare catalyst with high activity, high selectivity and good stability remains the biggest challenge in the hydrodeoxygenation (HDO) of phenols by adopting MoS 2 -based sulfides as catalysts. Herein, we report a simple hydrothermal method to synthesize highly-dispersed nano-MoS 2 with abundant defects and some curved slabs. All these advantages enable nano-MoS 2 to provide a large number of coordination unsaturated sites to anchor Co atoms. The unsupported Co-doped catalyst with an optimal Co/(Co + Mo) molar ratio of 0.3 exhibited excellent performance in the HDO of p -cresol with conversion of 98.7 % and toluene selectivity of 98.9 % at 220 °C. Moreover, the optimized Co/MoS 2 -0.3 catalyst had a good stability after reaction of 72 h. The excellent HDO performance was attributed to the formation of abundant Co-Mo-S active sites which optimize the electrical structure of nano-MoS 2 by Co promoter.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Xiangdong Kong,Jingwen Ke,Zhiqiang Wang,Yan Liu,Yibo Wang,Weiran Zhou,Zhengwu Yang,Wensheng Yan,Zhigang Geng,Jie Zeng
A typical mode of CO 2 activation is that d electrons at the d orbital of transition metals transfer to the unoccupied π * orbital of CO 2 . Thus the exploration of the relationship between d -electron behaviors and CO 2 activation is of great importance. Herein, we demonstrate that high-spin state of 3 d electrons in Co 2+ facilitated the activation of CO 2 over Co-salophen-X (X represents to Cl, Br, or I). Among these catalysts, Co-salophen-Br exhibited the highest Faradaic efficiency for CO. Notably, the Faradaic efficiency for CO over Co-salophen-Br reached 98.5 % at −0.70 V versus reversible hydrogen electrode, which was 1.5 and 1.2 times as high as those over Co-salophen-Cl (64.8 %) and Co-salophen-I (81.8 %), respectively. Density functional theory calculations revealed that high-spin state of Co sites decreased the reaction energy barrier for the formation of CO. Based on the analysis of electronic state, the ratio of high-spin state was 65.6 % for Co-salophen-Br, which was the highest among the three Co-based molecules. The Co sites with high-spin state promoted the electron transfer from high-energy 3 d orbital (3 d z2 and 3 d x2-y2 ) of Co to the unoccupied π * orbital of CO 2 , improving catalytic performance.
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Fashion and Textiles
·
2021
·Vol. 8
·期 1
·1-12
·
IF 2.2
Chen Yuanli,Fan Hui,Zha Xinlin,Wang Wenwen,Wu Yi,Xiong Yi,Yan Kun,Wang Yuedan,Wang Dong
High efficiency and anti-pollution oil/water separation membrane has been widely explored and researched. There are a large number of hydroxyl groups on the surface of silica, which has good wettability and can be used for oil-water separation membranes. Hydrophilic silica nanostructures with different morphologies were synthesized by changing templates and contents of trimethylbenzene (TMB). Here, silica nanospheres with radical pores, hollow silica nanospheres and worm-like silica nanotubes were separately sprayed on the PVA -co- PE nanofiber membrane (PM). The abundance of hydroxyl groups and porous structures on PM surfaces enabled the absorption of silica nanospheres through hydrogen bonds. Compared with different silica nanostructures, it was found that the silica/PM exhibited excellent super-hydrophilicity in air and underwater “oil-hating” properties. The PM was mass-produced in our lab through melt-extrusion-phase-separation technique. Therefore, the obtained membranes not only have excellent underwater superoleophobicity but also have a low-cost production. The prepared silica/PM composites were used to separate n-hexane/water, silicone oil/water and peanut oil water mixtures via filtration. As a result, they all exhibited efficient separation of oil/water mixture through gravity-driven filtration.
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Catalysis Science & Technology
·
2021
·Vol. 11
·期 10
·3422-3427
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IF 6.119
Yuqing Shao,Xinkui Wang,Zhaolin Dou,Xiaoyu Liang,Xinxin Zhang,Min Pang,Qiang Xu,Min Ji,Min Wang
Solar-driven CO2 conversion into fuels and sustainable energy has attracted increasing attention around the world. However, the efficiency of the transformation remains relatively low due to the rapid recombination of photogenerated charge carriers. In this work, we prepared a ZnIn2S4–ZnAlOx nanocomposite for visible light driven CO2 reduction. The thin layered structure facilitated the photoinduced charge carrier separation and transfer, and also gave excellent adsorption ability towards CO2 molecules. Such a nanocatalyst exhibited excellent activity in visible-light driven CO2 reduction with a CO optimal formation rate of 1100 μmol g−1 h−1, which is 5 times that over bulk ZnIn2S4, and the CO/H2 ratio was increased from 0.2 over bulk ZnIn2S4 to 1.5 over the ZnIn2S4–ZnAlOx composite. In situ FT-IR experiments indicated that CO2 was reduced on ZnIn2S4–ZnAlOx following a COOH* pathway. This work gives insights into the mechanism of the photocatalytic CO2 reduction reaction and inspiration to construct novel heterostructure materials for application in energy and environmental catalysis.
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JOURNAL OF MATERIALS SCIENCE
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2021
·Vol. 56
·期 23
·13023-13030
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IF 4.22
Bian Kan,Li Xiuxiu,Wang Yiping,Li Xiongjie,Sun Sheng,Feng Shuo,Yang Ying
Pb(Zr, Ti)O 3 (PZT)-based piezoelectric ceramics and Al 2 O 3 -based structural ceramics were cast and co-fired to prepare a layered piezoelectric ceramic/structural ceramic composite. Considering the significant differences in sintering characteristics of PZT- and Al 2 O 3- based ceramics, control of the sintering temperature and the dependence of the linear shrinkage on the solid content of the tape-casting films were systematically conducted at first. The sintering density and the interface bonding properties of the prepared composites were then investigated. The results of electrical and mechanical properties of the composite ceramics indicate: By using sintering aids, Al 2 O 3 ceramic could be fully densified and co-fired with PZT ceramic at 1150 °C. Shrinkage matching during sintering was achieved by adjusting the solid contents to 45 vol.% and 65 vol.% for PZT and alumina tape-casting films. In the layered composites, Al 2 O 3 structural ceramic presents an excellent mechanical property with HV hardness of 667, while the PZT functional ceramic presents d 33 , ε r and tanδ of 259 pC/N, 965 and 0.37%, respectively.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yiwei Han,Yichen Zhang,Shuai Wu,Mohammed Jalalah,Saeed A. Alsareii,Yongmei Yin,Farid A. Harraz,Genxi Li
The structures assembled by peptides have attracted great attention due to their unique physicochemical properties. Moreover, the co-assembly of peptides with additional components can endow the structures with extended functions. In this work, we have explored the co-assembly of peptides and carbon nanodots (CNDs) by taking advantage of their non-covalent binding; thus, the obtained structure may show both the recognition capability of peptides and the catalytic activity of CNDs. Therefore, we have further used the assembled structure for the sensitive analysis of transglutaminase 2 with a low detection limit of 0.25 pg/mL. By simply replacing the peptide sequences or the nanomaterials, the strategy proposed in this work can be developed as a universal model to build the co-assemblies of peptides and nanomaterials, thus leading to their broader applications in biological and biomedical research.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Yuxin Bi,Mingliang Ma,Zijian Liao,Zhouyu Tong,Yan Chen,Rongzhen Wang,Yong Ma,Guanglei Wu
The conductive networks for electron hopping and migration constructed by one-dimensional (1D) composite absorbers are highly desirable to improve the electromagnetic (EM) wave attenuation capacity. Herein, the Ni@Co/C@polypyrrole (PPy) composites integrating the advantages of component and microstructure were fabricated. The addition of Co/C and PPy effectively optimized the impedance matching and improved the EM attenuation. Under the comprehensive impacts of multiple reflections/scattering, conduction loss and interface polarization, the Ni@Co/C@PPy composites showed superior EM wave absorption with the reflection loss (RL) value of −48.76 dB and the effective absorption bandwidth (EAB) of 5.10 GHz at a corresponding thickness of 2.0 mm. The largest EAB could reach 5.54 GHz (7.24–12.78 GHz) at the thickness of 2.2 mm. This work provides a great reference for fabricating 1D novel EM wave absorption materials.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xingcen Liu,Jin Yuan,Zhuo Zhang,Zhaohui Huang,Jingcheng Hao
The construction of peptide and metal nanoparticles hybrid is attractive to explore their synergistic properties and applications extensively. However, it remains a challenge to fabricate a well-defined and size-controllable short peptide/Au nanoparticles hybrid. Here, we report a facile and flexible co-assembly strategy for the construction of tripeptide coated Au nanorods (AuNRs). The tripeptide (Phe-Phe-Cys, FFC) grows via covalently crosslinking to form spheres. The size of the core@shell nanospheres can be controlled by modulating the amount or size of AuNRs. Especially, the concentration of AuNRs fixes the amount of seeds, which further affect the local concentration of FFC on the surface of AuNRs seed, leading to a narrower diameter of hybrid compared to FFC spheres. Moreover, owing to their synergistic effects, this hybrid exhibits a good adsorption capacity of Hg 2+ from aqueous solutions by electrostatic interaction and forming into Au/Hg amalgam . This strategy could be extended to the fabrication of other biomolecules and metal nanoparticle hybrids with diverse functions.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Zhihao Sun,Zhaoqian Yan,Anran Li,Kaicheng Yue,Lanling Zhao,Lei Qian
In this paper, the modulation of microwave absorption performance through diatomic co-doping was systematically investigated. N, S co-doped reduced graphene oxide (NS-rGO) and S, B co-doped rGO (SB-rGO) were obtained by one-pot hydrothermal reaction and freeze-drying. The experimental results and theoretical calculations suggested that the charge distribution of N, B and S heteroatoms with adjacent C atoms obviously changed, which effectively regulated the electronic transmission and polarization state, and accordingly affected the dielectric response. Besides, compared to N-rGO and B-rGO, impedance matching characteristics and electromagnetic attenuating capability of NS-rGO and SB-rGO were significantly enhanced due to the synergistic regulation of pyrrolic N, pyridinic N, -CBO 2 -, B-C 3 and -C-SO 2 -C- bonds. NS-rGO exhibited the minimum reflection loss (RL min ) of −52 dB at 10 GHz under an ultra-low loading of 2 wt%, and its effective absorption bandwidth (EAB, below −10 dB) ranged from 7 GHz to 18 GHz in the thickness of 2.0–3.8 mm. SB-rGO also exhibited the RL min of −54.2 dB at 11.8 GHz under an ultra-low loading of only 1.5 wt%, and the EAB of 12 GHz (6–18 GHz) in the thickness of 2.0–3.8 mm. This work offers a deep insight into the relationship among dual atoms co-doping, dielectric performance and microwave absorption property.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-9
·
IF 4.38
Dong Wenjing,Song Erqun,Song Yang
The acute liver injury (ALI) and hepatic fibrosis caused by the co-treatment of lipopolysaccharide (LPS)/ d -galactosamine (D-GalN) have been extensively studied. However, whether LPS/D-GalN are genotoxic has been left unknown. In this study, male mice were divided into eight groups with eight animals in each group. For acute challenge of LPS/D-GalN, the mice in each group received a combination of LPS/D-GalN via intraperitoneal injection at the dose of 25 μg/kg/250 mg/kg, 25 μg/kg/500 mg/kg, or 50 μg/kg/500 mg/kg body weight. An additional group for chronic administration of test compounds was conducted by i.p. injection of LPS/D-GalN (10 μg/kg/100 mg/kg) every other day for 8 weeks. Saline solution (0.9%) and cyclophosphamide (CTX) (50 mg/kg body weight) given by i.p. injection was used as the negative and positive control, respectively. The results of single cell gel electrophoresis (SCGE) assay indicated that acute exposure of the mice to LPS/D-GalN caused severe DNA damage in hepatic cells, but not in the brain, sperm or bone marrow cells, which evidenced the genotoxicity of LPS/D-GalN administrated in combination. Interestingly, the chronic administration of LPS/D-GalN triggered significant genotoxic effects not only in hepatic but also in brain cells, with negative results in sperm and bone marrow cells. Histopathological examination in the liver and brain tissues revealed changes consistent with the SCGE results. The present study indicates genotoxic potential of LPS/D-GalN co-administered in mice, which may serve as an in vivo experimental model for relevant genotoxic study.
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高影响因子
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