ENVIRONMENTAL TECHNOLOGY
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2021
·
IF 3.247
Donghai Yuan,Wanxia Liu,Jiazhuo Wang,Jun Cui,Liansheng He,Chenling Yan,Yingying Kou,Junqi Li
In this study, an efficient adsorption and reusable magnetic ligand material (Fe3O4@Chitosan-EDTA) was synthesized by binding EDTA dianhydride onto magnetic chitosan, and it was employed in removal of Co(II) from aqueous solution. The maximum adsorption capacity of Co(II) onto Fe3O4@CS-EDTA was 48.78 mg/g at pH = 5 (303 K), which is much higher than that of Fe3O4@Chitosan as well as chitosan. The kinetics of Co(II) on the Fe3O4@CS-EDTA was consistent with the pseudo-second-order model. The equilibrium data were better fit with the Langmuir isothermal model than with the Freundlich isothermal model, suggesting that the adsorption mechanism was chemical monolayer homogeneous adsorption. The thermodynamic data showed that the sorption of Co(II) was spontaneous. Furthermore, after four cycles, the adsorption capacity of Co(II) onto the Fe3O4@CS-EDTA still retained 84.5% of the capacity of the fresh adsorbent, indicating that Fe3O4@CS-EDTA can be considered a promising recyclable adsorbent to remove heavy-metal ions from wastewater.
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PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2021
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IF 3.498
Yajun Ji,Yanping Xie,Lingyun Zheng,Feiya Xu
Sulfate radical-based advanced oxidation technology has been considered one of the most effective methods to remove organic pollutants from water. In this study, porous Co-doped LaFeO 3 catalysts were synthesized by the sol-gel method and applied in peroxymonosulfate (PMS) activation for organic pollutants degradation. The effects of catalyst dosage, PMS concentration, initial pH of the solution and radical scavenger on the degradation of Acid Red G (ARG) were systematically studied. The porous LaFeO 3 showed higher specific surface area (27.62 m 2 /g) and pore volume (0.15 cm 3 /g) than the traditional LaFeO 3 (7.83 m 2 /g and 0.11 cm 3 /g), resulting in higher activity. After doping Co, more oxygen vacancies generated. The catalytic activity of LaFe 1-x Co x O 3 was remarkably enhanced. ARG could be completely degraded in LaFe 0.90 Co 0.10 O 3 /PMS system within 10 min. The degradation rate was 51 times higher than that in the porous LaFeO 3 /PMS system. The superior activity can be attributed to the oxygen vacancies and synergistic effect of Co and Fe, which facilitated the activation of PMS and generated SO 4 •- and HO•. It was SO 4 •- that mainly contributed to the degradation of ARG. The detailed degradation pathway was proposed, according to the intermediate products of ARG degradation. Besides, the degradation rate of ARG by the as-prepared catalyst exceeded 80% even after using for 5 times.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Huixin Wang,Wenshen Wang,Chengpan Li,Ao Xu,Bensheng Qiu,Fenfen Li,Weiping Ding
Microneedles (MNs) are an attractive strategy for the efficient, painless transdermal delivery of drugs with low systemic toxicity. In this work, a novel near-infrared (NIR) light-triggered separable microneedle system was fabricated to supply controlled chemo-thermal therapy to superficial tumors by co-loading a self-developed NIR-II fluorescence fluorophore Flav7 and the antitumor drug doxorubicin (DOX) in phase-change polycaprolactone (PCL) arrowheads on a soluble base. For the MNs we proposed, Flav7 offers MNs with NIR light-triggered heating generation and drug release properties as well as a NIR-II imaging ability for guiding combined chemo-thermal therapy, and the soluble supporting base ensures that the needle arrows are embedded in the skin after insertion and endows the MNs with a separation ability to reduce the contact time of the MNs with the skin. In vitro studies showed that Flav7 + DOX-loaded MNs exhibited adequate insertion abilities, stable thermal properties, and desirable light-activated melting effects and drug release capabilities. In vivo studies showed that the Flav7 + DOX-loaded MNs presented a remarkable NIR-II imaging ability, a good biosafety to the major organs, and a strong tumor-killing ability. It is worth noting that all of the treated breast cancer mice survived for 50 days without tumor recurrences or major organ damage. This study presented a promising MN system loaded with the multipurpose small molecule Flav7 that can be used for high-efficiency light-activated drug release for chemotherapy and high-performance light-controlled thermotherapy of tumors and also for remarkable NIR-II fluorescence imaging to guide chemo-thermal therapy.
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NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 45
·期 36
·16705-16713
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IF 3.591
Xue Meng,Li Yan,Maobin Wei,Tao Wang,Ting Xu,Yongsheng Yan,Shihan Cheng
The developed peroxydisulfate (PDS) activation for removing pollutants is a significant technology. Here, a Co(OH)2/Cu2O composite was synthesized and used to activate PDS for tetracycline (TC) degradation. Covering the surface of Cu2O with Co(OH)2 could improve the stability of the material, reactive active sites, and electron transfer efficiency of the catalyst. Thus, Co(OH)2/Cu2O composite exhibited excellent performance in terms of degrading the TC pollutant, and in the Co(OH)2/Cu2O/PDS system, the removal rate of TC could reach 98% within 30 min. Moreover, the effect of pH value, PDS dosage, and TC concentration on the degradation efficiency of TC was systematically studied. According to free radical quenching experiments, the possible mechanism of TC degradation over the Co(OH)2/Cu2O/PDS system was proposed. This work provided a research basis for the use of metal oxides for PDS activation in environmental treatment.
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RSC Advances
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2021
·Vol. 11
·期 42
·26319-26325
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IF 3.361
Xin Hao
High-efficiency, porous and renewable magnetic microwave absorbing (MA) materials have been enthusiastically pursued due to their suitable impedance matching, light weight, strong multiple scattering and the synergy effect of dielectric and magnetic loss. Herein, a three-dimensional (3D) Co@C/ANF aerogel, composed of magnetic MOF derivatives embedded in biomass aramid nanofiber (ANF), was prepared for the first time through a directional-freezing method followed by an annealing process. To evaluate their MA attenuation performance, the electromagnetic parameters of Co@C/ANF composites with different component ratios were measured at 2–18 GHz. Profiting from the preserved porous structure of MOF derivatives, the construction of multiple heterogeneous interfaces and suitable electromagnetic parameters, Co@C/ANF 2 : 1 exhibited a good MA performance of RLmin = −64.3 dB (indicating more than 99.99996% microwaves were absorbed) and EABmax = 6.8 GHz. Considering the admirable overall performance, the Co@C/ANF aerogel is deemed to be a promising candidate for the next-generation of lightweight, reproducible, and high-performance MA materials.
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PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Zhi Shen,Qiang Zhao,Hai-Quan Xie,Yu-Quan Feng,Shu-Yang Chen,Zhuo Shi
In this study, a multiple binding sites ligand, 5-(4-carboxyphenoxy)nicotinic acid ligand (H 2 cpna), was used to construct metal complexes with Zn 2+ , Cd 2+ , Mn 2+ and Co 2+ by solvothermal reaction, and four new complexes were constructed, namely, [Zn (cpna)•H2O]n (1)，[Cd (cpna) (CH 3 CN)·2H 2 O] n ( 2 ), [Mn (cpna)•2H 2 O] n ( 3 ) and Co(cpna)•2H 2 O] n ( 4 ); All the complexes were characterized by single crystal X-ray diffraction, elemental analysis and infrared analysis in the solid state; Single crystal x-ray diffraction analyses reveal that complexes 1 and 2 have two-dimensional network structures, complexes 3 and 4 have three-dimensional structures. In addition, Luminescence behavior of complex 1 and 2 was investigated and magnetic properties of complex 3 and 4 were studied. The fluorescent test results show that the fluorescence intensity of complex 1 is higher than that of ligand and emission band can be considered as LLCT emission of ligand; The Magnetic results indicate weak ferromagentic interactions in complex 3 and χ m T value rises slowly and then decreases sharply from 300 K to 2 K. However, magnetic results indicate antiferromagentic interactions in complex 4 and χ m T value can be divided into three parts with the change of temperature from 300 K to 2 K.
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INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
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2021
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IF 2.583
Weirui Sun,Yinchun Hu,Yizhu Cheng,Sen Yang,Zhiqin Kang
Both physical and chemical cross-linking methods can improve the mechanical properties of hydrogel by increasing the cross-link density. In this study, a series of polyvinyl alcohol/polyacrylamide-co-polyacrylic acid (PVA/PAM-co-PAA)-based hydrogels were prepared by using Fe3+ as physical cross-linking agent and N,N’-methylenebisacrylamide (MBA) as chemical cross-linking agent. The stress relaxation experiments of PVA/PAM-co-PAA-based hydrogels and nonlinear fitting analysis were performed to study the effects of cross-linking methods on stress relaxation behavior of hydrogels. Furthermore, the four-element generalized Maxwell model succeeded in simulating stress relaxation behavior of hydrogels. When Fe3+ was used as the cross-linking agent of Fe3+/PVA/PAM-co-PAA hydrogel, it took a long time of 199.9 s when the structural units began to move. However, when MBA was used as the cross-linking agent of PVA/PAM-MBA-PAA hydrogel, the time was shortened significantly. Compared with PVA/PAM-co-PAA hydrogel, the initial and equilibrium stress of Fe3+/PVA/PAM-co-PAA and PVA/PAM-MBA-PAA hydrogel significantly increased. When Fe3+ and MBA were used as the cross-linking agent of Fe3+/PVA/PAM-MBA-PAA hydrogel together, the network structure became looser. The initial and equilibrium stress were 0.04 and 0.015 MPa, respectively.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 23
·13678-13687
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IF 12.732
Dan Wang,Hao Xu,Peixia Yang,Xiangyu Lu,Jingyuan Ma,Ruopeng Li,Lihui Xiao,Jinqiu Zhang,Maozhong An
Compared to individual metal sites, e.g. Fe–N4 sites, the synergistic effect of dual-metal sites can further adjust the interaction of reactants or intermediates with active sites, which is beneficial for boosting the oxygen reduction reaction (ORR) in Zn–air batteries. However, developing a simple and direct method instead of complicated procedures and post-treatment to realize well-defined dual-metal sites is still a grand challenge. Herein, a facile one-step impregnation-pyrolysis route without any post-treatment is developed to controllably synthesize Fe and Co dual-metal sites embedded in hierarchical N-doped carbon from metal–organic frameworks. X-ray absorption spectra coupled with density functional theory calculations demonstrate that the Fe–N4 and Co–N4 dual sites can synergistically enhance the ORR activity. Impressively, the well-controlled FeCo–N–C catalyst exhibits excellent ORR performance, with half-wave potentials (E1/2) of 0.807 and 0.904 V in 0.1 M HClO4 and 0.1 M KOH, respectively. Benefiting from the highly active dual-metal sites and desired porous structure, FeCo–N–C serving as a cathode catalyst achieves an uplifting peak power density of 196.3 mW cm−2 and a remarkable specific capacity of 728.6 mA h gZn−1 at a discharge current density of 20 mA cm−2 in a practical liquid Zn–air battery. Besides this, such superb battery performance is demonstrated in an all-solid-state Zn–air battery.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Lei Xue,Aiai Zhang,Jinfang Wu,Qi Wang,Yang Liu,Yuansong Zhao,Shangpeng Liu,Ze Liu,Ping Li,Shanghong Zeng
Surface chemistry can be modified by introducing another component on the surface of catalyst due to the regulation of configuration and electronic properties. Herein, the nanostructured ZnO hollow microspheres were fabricated for selective CO 2 reduction to CO. The addition of CuO weakens the strength of adjacent Zn-O bond and improves the formation of more zero-valence Zn. Small CuO entities can provide the active sites for CO 2 adsorption, and the presence of surface defects due to Zn 2+ reduction could enhance initial dissociation from CO 2 to CO. More interestingly, the 3CuO/ZnO catalyst underwent reconstruction during electrocatalysis , and multi-shelled hollow spheres evolved into a thin flaky structure. The extended surface area of flaky morphology enhances the catalytic stability despite the occurrence of ZnO reduction. This study highlights the importance of surface modification for CO 2 selective reduction to CO but also provides some insights on reconstruction during electrochemical reduction of CO 2 .
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Ping Ma,Xianliang Li,Yuchi Zhang,Le Han,Yan Xu
In this work, hierarchical spinel-type semiconductors MGa 2 O 4 (M = Ni, Co) were successfully synthesized via a facile hydrothermal method and a subsequent calcination strategy. The phase compositions, microstructures, as well as the gas sensing performances of these isostructural corn-like MGa 2 O 4 (M = Ni, Co) architectures were comparatively and systematically investigated. The experimental results showed that the hierarchical corn-like NiGa 2 O 4 spinel exhibited the optimum selective triethylamine (TEA) sensing performance with a gas response value (R g /R a ) of 7.60 at 270 °C, and excellent long-term stability for at least one month. The TEA gaseous sensing properties of these materials were significantly influenced by the transition metal M(II) ions dominated at the octahedral sites of spinel, and the sensing mechanism involving the surface redox reactions between the active oxygen species and TEA gases, as well as the charge carrier hopping process and changes of conductivity were discussed. This work not only demonstrated the facile preparation of hierarchical corn-like spinel-based gas sensors with rich active sites, we also discovered that the gas sensing performances of MGa 2 O 4 (M = Ni, Co) can be decisively modulated by the transition metal M(II)-ions.
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JOURNAL OF CATALYSIS
·
2021
·
IF 7.92
Xiaoqing Gao,Shanhui Zhu,Mei Dong,Weibin Fan
Highly efficient conversion of carboxylic acids to valuable alcohols is a great challenge for easily corroded non-noble metal catalysts. Here, a series of few-layer graphene encapsulated metastable hexagonal closed-packed (hcp) Co nanoparticles were fabricated by reductive pyrolysis of metal-organic framework precursor. The sample pyrolyzed at 400 °C (hcp-Co@G400) presented outstanding performance and stability for converting a variety of functional carboxylic acids and its turnover frequency was one magnitude higher than that of conventional facc-centered cubic (fcc) Co catalysts. In situ DRIFTS spectroscopy of model reaction acetic acid hydrogenation and DFT calculation results confirm that carboxylic acid initially undergoes dehydroxylation to RCH 2 CO* followed by consecutive hydrogenation to RCH 2 CH 2 OH through RCH 2 COH*. Acetic acid prefers to vertically adsorb at hcp-Co (0 0 2) facet with a much lower adsorption energy than parallel adsorption at fcc-Co (1 1 1) surface, which plays a key role in decreasing the activation barrier of the rate-determining step of acetic acid dehydroxylation.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Yang Ren,Haiyan He,Yunwei Wang,Ying Gong,Gaoyang Zhao
In this study, the F–Nb co-doped TiO 2 films (TFNO) were prepared on soda lime glass using the sol-gel method. Multielement doping was carried out to further improve the conductivity of Nb-doped TiO 2 (TNO) thin films by increasing the carrier concentration. The effect of fluorine doping on the microstructure, chemical composition, and optoelectronic properties of the TFNO films was investigated. The results show that the obtained films are polycrystalline with an anatase structure. Both niobium and fluorine are present in the TiO 2 films (as Nb 5+ and F − ). With increasing fluorine doping, the visible-light transmittance of the film increases slightly, and the carrier concentration continues to increase until saturation. However, the carrier mobility decreases gradually. The TFNO film exhibits the optimal optoelectronic properties, when the F:Ti atomic ratio is 0.5:1, reaching a resistivity of 0.02 Ω cm and a visible-light transmittance of 81%.
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