APPLIED SURFACE SCIENCE
·
2021
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IF 6.707
Xin Jiang,Sanmei Liu,Wen Wang,Shunli Shi,Zhenxing Zeng,Chao Chen
Photocatlytic water disinfection for pathengenic miroorgasnisms removal is of great importance to public health safety, however the photocataltyic performance is unsatisfactory due to the low reactive oxygen species (ROS) generation. In this work, an innovative energy-transfer-mediated oxygen activation system on PCN-224-Zn is proposed for selective singlet oxygen generation without the need of electron-hole separation. The as-prepared PCN-224-Zn exhibits remarkable singlet triggered photocatalytic E-coli inactivation and organic pollutant degradation performance. The enhanced photocatalytic activity is attributed to the introduction of Zn into the metal-organic frameworks (MOFs) that facilitates the transformation of electron-hole couple from singlet to triplet state for selective singlet oxygen generation with high efficiency. This work provides a new oxygen activation pathway for efficient and selective ROS generation without the need of electron-hole separation.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Qingwu Wang,Qiaoyi Han,Xin Xu,Xu Ding,Xiaojuan Nie,Xiaodong Xu,Xia Liu,Chunhong Zhang,Junqing Li,Qiang Shi
Herein, a novel bioinspired radial porous zinc-based metal-organic framework (Zn-MOF) doped sodium alginate/chitosan derivatives/pullulan-based SA/PSCS/Pul/Zn-MOF (SPCP/Zn) composites sponge with excellent antioxidant and antibacterial properties was fabricated by the ice-templating method. Boric acid (BA) and Ca 2+ , which were respectively used as hydrogen- and ionic- bonding cross-linkers, provided strong mechanical properties for sponge matrix composed of SA, PSCS, and Pul. The obtained SPCP/Zn sponge exhibited uniform porous morphology, proper hydrophilicity , and admirable biocompatibility. In addition, the SPCP/Zn sponge achieved a sustained release of Zn 2+ and gallic acid , which displayed powerful antibacterial and antioxidant activities . Importantly, the SPCP/Zn sponge exhibited shorter rapid hemostasis (20.4 ± 2.9 s) and lower blood loss (19.8 ± 4.3 mg). The SPCP/Zn sponge also showed faster wound closure ratio for the rat full-thickness skin defect model. It was revealed that SPCP/Zn sponge could significantly accelerate and enhance wound healing through downregulating inflammatory cytokines (TNF-α, IL-6) and increasing the expression of growth factors (VEGF). Due to its excellent properties, the SPCP/Zn sponge may have promising potential in wound healing applications.
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Journal of Energy Chemistry
·
2023
·
IF 13.1
Katam Srinivas,Zhuo Chen,Anran Chen,Fei Ma,Ming-qiang Zhu,Yuanfu Chen
The development of efficient single-atom catalysts (SACs) for the oxygen reduction reaction (ORR) remains a formidable challenge, primarily due to the symmetric charge distribution of metal single-atom sites (M-N 4 ). To address such issue, herein, Fe-N x sites coupled synergistic catalysts fabrication strategy is presented to break the uniform electronic distribution, thus enhancing the intrinsic catalytic activity. Precisely, atomically dispersed Fe-N x sites supported on N/S-doped mesoporous carbon (NSC) coupled with FeS@C core-shell nanoparticles (FAS-NSC@950) is synthesized by a facile hydrothermal reaction and subsequent pyrolysis. Due to the presence of an in situ-grown conductive graphitic layer (shell), the FeS nanoparticles (core) effectively adjust the electronic structure of single-atom Fe sites and facilitate the ORR kinetics via short/long-range coupling interactions. Consequently, FAS-NSC@950 displays a more positive half-wave potential ( E 1/2 ) of 0.871 V with a significantly boosted ORR kinetics (Tafel slope = 52.2 mV dec −1 ), outpacing the commercial Pt/C ( E 1/2 = 0.84 V and Tafel slope = 54.6 mV dec −1 ). As a bifunctional electrocatalyst, it displays a smaller bifunctional activity parameter (Δ E ) of 0.673 V, surpassing the Pt/C-RuO 2 combination (Δ E = 0.724 V). Besides, the FAS-NSC@950-based zinc-air battery (ZAB) displays superior power density, specific capacity, and long-term cycling performance to the Pt/C-Ir/C-based ZAB. This work significantly contributes to the field by offering a promising strategy to enhance the catalytic activity of SACs for ORR, with potential implications for energy conversion and storage technologies.
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Bioactive Materials
·
2023
·
IF 18.9
Zhenbao Zhang,Aobo Liu,Jiadong Fan,Menglin Wang,Jiabao Dai,Xiang Jin,Huanze Deng,Xuan Wang,Yijie Liang,Haixia Li,Yantao Zhao,Peng Wen,Yanfeng Li
Zinc (Zn) alloy porous scaffolds produced by additive manufacturing own customizable structures and biodegradable functions, having a great application potential for repairing bone defect. In this work, a hydroxyapatite (HA)/polydopamine (PDA) composite coating was constructed on the surface of Zn–1Mg porous scaffolds fabricated by laser powder bed fusion, and was loaded with a bioactive factor BMP2 and an antibacterial drug vancomycin. The microstructure, degradation behavior, biocompatibility, antibacterial performance and osteogenic activities were systematically investigated. Compared with as-built Zn–1Mg scaffolds, the rapid increase of Zn 2+ , which resulted to the deteriorated cell viability and osteogenic differentiation, was inhibited due to the physical barrier of the composite coating. In vitro cellular and bacterial assay indicated that the loaded BMP2 and vancomycin considerably enhanced the cytocompatibility and antibacterial performance. Significantly improved osteogenic and antibacterial functions were also observed according to in vivo implantation in the lateral femoral condyle of rats. The design, influence and mechanism of the composite coating were discussed accordingly. It was concluded that the additively manufactured Zn–1Mg porous scaffolds together with the composite coating could modulate biodegradable performance and contribute to effective promotion of bone recovery and antibacterial function.
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Small
·
2023
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IF 13.3
Qiusheng Zhou,Min Min,Minmin Song,Shiqiang Cui,Nan Ding,Mingyuan Wang,Shuangying Lei,Chuanyin Xiong,Xinwen Peng
The rational design of bifunctional oxygen electrocatalysts with unique morphology and luxuriant porous structure is significant but challenging for accelerating the reaction kinetics of rechargeable Zn–air batteries (ZABs). Herein, zinc-mediated Fe, N-codoped carbon nanocages (Zn-FeNCNs) are synthesized by pyrolyzing the polymerized iron-doped polydopamine on the surface of the ZIF-8 crystal polyhedron. The formation of the chelate between polydopamine and Fe serves as the covering layer to prevent the porous carbon nanocages from collapsing and boosts enough exposure and utilization of metal-based active species during carbonization. Furthermore, both the theoretical calculation and experimental results show that the strong interaction between polyhedron and polydopamine facilitates the evolution of high-activity zinc-modulated FeNx sites and electron transportation and then stimulates the excellent bifunctional catalytic activity for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). As expected, the Zn–air battery with Zn-FeNCNs as an air cathode displays a superior power density (256 mW cm −2 ) and a high specific capacity (813.3 mA h gZn −1 ), as well as long-term stability over 1000 h. Besides, when this catalyst is applied to the solid-state battery, the device exhibited outstanding mechanical stability and a high round-trip efficiency under different bending angles.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
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IF 19
Peng-Fang Zhang,Jia-Hui Li,Shao-Jian Zhang,Da-Cheng Li,Su-Yuan Zeng,Shu-Ling Xu,Qing-Xia Yao,Ling-Yang Liu,Lei Ding,Heng-Xiang Li,Yi-Yang Hu,Jun-Tao Li,Yao Zhou
Zn–iodine (I 2 ) battery, as a promising energy storage device, especially under high I 2 loading, is harassed by the shuttle effect of the soluble polyiodide intermediates. Herein, the bifunctional role of 2D carbon nanosponge with rich P-dopant (4.2 at%) and large specific surface area (1966 m 2 g −1 ) in anchoring I 2 /I x − ( x = 1, 3 or 5) and catalyzing their mutual conversion is reported. Both experiment and computational results reveal the transfer of electrons from the P-doped site to iodine species, showing strong interfacial interaction. When being used as a host, it possesses high specific capture capacity for I 2 (3.34 g iodine g −1 or 1.6 mg iodine m −2 ) and I x − (6.12 g triiodide g −1 or 3.1 mg triiodide m −2 ), which thus effectively suppresses the shuttle effect, supported by in situ UV–vis and Raman spectra. In addition to the strong interfacial interaction that favors iodine conversion, the P-doped sites can also catalyze the conversion of I 5 − to I 2 , which is the rate-determining step. Consequently, Zn–I 2 batteries under a high I 2 content (70 wt%) deliver high specific capacity (220.3 mAh g −1 ), superior Coulombic efficiency (>99%), and low self-discharge rate; moreover, they can also operate steadily at 2 A g −1 with ignorable capacity decay for 10 000 cycles.
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JOM
·
2023
·Vol. 75
·期 11
·4808-4818
·
IF 2.6
Zhang Feng,Sun Wei,Zhang Hongliang,Chen Daixiong,Li Songjiang,Chen Jianhua,Zhang Chenyang
In this study, selective adsorption mechanism of zinc ions on the surfaces of galena and sphalerite in the flotation separation of Pb-Zn was comprehensively explored by flotation tests, Zeta potential measurements, Fourier transform interferometric radiometer (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) analysis, and density functional theory (DFT) calculations. Microflotation test showed that the use of ZnSO 4 in alkaline pulp could selectively separate galena from sphalerite better than that without ZnSO 4 . Zeta potential test results showed that ZnSO 4 could significantly increase the Zeta potential of sphalerite under alkaline conditions, but had little effect on galena. The results of FTIR test showed that xanthan characteristic peak appeared in xanthate-treated galena at pH = 10, while sphalerite treated with xanthate did not. XPS and DFT calculation results showed that sphalerite had stronger adsorption capacity for hydroxyl ions than galena. DFT calculation further confirmed that Zn(OH) 2 could be adsorbed on the surface of hydroxylated sphalerite instead of hydroxylated galena and formed a new interface microstructure of sphalerite (Zn surf -O-Zn-O-H), resulting in the inhibition of sphalerite. This paper further deepened the selective adsorption mechanism of zinc ions on the surface of sphalerite in the flotation separation of Pb-Zn under alkaline conditions.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2023
·
IF 2.9
Zhan Ke,Du Yongkun,Liu Qingqing,Cui Chenxu,Xing Guangxu,Li Shanshan,Ren Hongtao,Wang Fan,Xu Chao,Wang Na
Wheat gliadin is thought to be the main cause of wheat allergy leading to celiac disease. In this study, we reported an electrochemical immunosensor based on AuNPs/Zn/Ni-ZIF-8-800@graphene for simple, efficient, and sensitive detection of gliadin. A monoclonal antibody against gliadin were prepared by hybridoma technique. Zn/Ni-ZIF-8-800 with high stability was prepared by using zinc–nickel bimetallic organic framework MOFs, and graphene and gold nanoparticles with large surface area and excellent conductivity were introduced. Chitosan was used as a binder to fixed the composite on the surface of glassy carbon electrode. The fabricated materials and the corresponding sensors were comprehensively characterized by X-ray diffractometer, scanning electron microscope, transmission electron microscopy, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller, and cyclic voltammetry analyses. Under the optimal conditions, the linear range of the electrochemical immunosensor was 0.1–100 μg mL −1 , and the detection limit was 0.950 μg mL −1 . In addition, the fabricated sensor exhibited high selectivity and long-term stability. The recovery test showed that the prepared sensor was suitable for the detection of gliadin in real food and feed, exhibiting great promising of the developed sensor in practical application. Graphical abstract
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FUEL
·
2023
·
IF 7.4
Shiqin Sun,Yanshun Li,Ruixiang Sun,Luzhen Jiao,Shiwei Liu,Shitao Yu
A novel Zn-based acidic functionalized deep eutectic solvent (DES) catalyst were prepared by a “tailoring” mixing procedure of Brønsted acidic hydrogen bond donors (HBD) and Lewis acidic hydrogen bond acceptor (HBA). It is found that the hydrogen bonded cluster with thermal stability and adjustable acidity has an excellent flexible hydrogen bond “assembly mode”, providing a suitable coordination microenvironment for Zn active center. The functionalized DESs were investigated to produce caprolactam from cyclohexanone oxime. The results showed that DES [ZnCl 2 ][ChCl][TCA] 2 had an excellent catalytic performance for the reaction with 100% cyclohexanone oxime conversion and ε-caprolactam 99.4% selectivity at 80 °C for 1.5 h, attributing to the strong complexing ability of Zn active center and the synergistic effect of BrØnsted and Lewis acid sites of DES, which also decreased the energy barriers of the intermediates and transition states, thus reducing the reaction energy ( E a = 29.22 kJ mol −1 and Δ G = –32.8 kJ mol −1 ). Otherwise, the recovered DES [ZnCl 2 ][ChCl][TCA] 2 was reused seven times with no significant decrease in its catalytic performance. The advantages of this method, such as high yield, short reaction time, and easy catalyst recovery, make the DES catalytic system a potential method for Beckmann rearrangement.
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ENERGY & FUELS
·
2021
·
IF 3.605
Zhaogen Zhu,Jinming Zhang,Xiaomin Peng,Yiyi Liu,Tianlun Cen,Zhifeng Ye,Dingsheng Yuan
Developing efficient bifunctional electrocatalysts with excellent oxygen reduction and evolution reaction (ORR/OER) activity to meet practical demands in Zn–air batteries (ZABs) is highly crucial and challenging. Herein, a simple hydrothermal one-step method is exploited to successfully synthesize Co3O4–NiCo2O4 anchored on N-doped reduced graphene oxide nanosheets (Co3O4–NiCo2O4/N-RGO). The active sites present in Co3O4–NiCo2O4/N-RGO and the synergy between N-RGO and Co3O4–NiCo2O4 accelerate the charge transfer and transport rate during the electrochemical course, which improves the ORR/OER activities of the Co3O4–NiCo2O4/N-RGO electrocatalyst. As expected, the Co3O4–NiCo2O4/N-RGO exhibits a better half-wave potential in the ORR and a lower Tafel slope during the OER process. A ZAB with optimal Co3O4–NiCo2O4/N-RGO as the cathode gives a higher open-circuit voltage (1.49 V), larger power density (97 mW cm–2), and better stability (180 h).
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
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IF 7.46
Runmin Huang,Dan Liao,Zhenhua Liu,Jingang Yu,Xinyu Jiang
Construction of high-sensitive analytical platform to monitor organic pollutants in the environment is of significance. Nitrophenol is toxic organic pollutant, causing serious damage to biosphere. Herein, a simple self-assembled method was proposed to design a novel heterostructure (MXene/ ZIF) composed of Nb 2 CT X and Zn-Co-ZIFs derived bimetallic Zn, Co embedded N-doped carbon (Zn-Co-NC) nanocage. The Nb 2 CT X / Zn-Co-NC composite modified electrodes were applied for the electrochemical detection of 4-nitrophenols (4-NP). SEM images revealed that the insertion of Zn-Co-NC can effectively avoid Nb 2 CTx from restacking. EDS and XPS demonstrated the successful synthesis of bimetallic Zn, Co embedded N-doped carbon nanocage. Excellent conductivity and large specific surface area of Nb 2 CTx as well as superior catalytic activity of Zn-Co-NC nanocage enhance the electrochemical performance of Nb 2 CTx/ Zn-Co-NC sensor. Under optimal conditions, the achieved wide linear range was 1 μM to 500 μM. The low detection limit of 0.070 μM with high sensitivity of 4.65 μA μM −1 cm -2 was obtained. Furthermore, the Nb 2 CTx/ Zn-Co-NC sensor holds outstanding selectivity and stability. Therefore, the innovative structure and excellent properties of MXene/ ZIF make them alternative materials for various electrochemical sensors for the detection of other toxic organic pollutants.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Kai Peng,Weiqi Zhang,Narayanamoorthy Bhuvanendran,Qiang Ma,Qian Xu,Lei Xing,Lindiwe Khotseng,Huaneng Su
Pt-based alloy nanomaterials with nanodendrites (NDs) structures are efficient electrocatalysts for methanol oxidation reaction (MOR), however their durability is greatly limited by the issue of transition metals dissolution. In this work, a facile trace Ir-doping strategy was proposed to fabricate Ir-PtZn and Ir-PtCu alloy NDs catalysts in aqueous medium, which significantly improved the electrocatalytic activity and durability for MOR. The as-prepared Ir-PtZn/Cu NDs catalysts showed distinct dendrites structures with the averaged diameter of 4.1 nm, and trace Ir doping subsequently improved the utilization of Pt atoms and promoted the oxidation efficiency of methanol. The electrochemical characterizations further demonstrated that the obtained Ir-PtZn/Cu NDs possessed enhanced mass activities of nearly 1.23 and 1.28-fold higher than those of undoped PtZn and PtCu, and approximately 2.35 and 2.67-fold higher than that of Pt/C in acid medium. More excitingly, after long-term durability test, the proposed Ir-PtZn and Ir-PtCu NDs still retained about 88.9% and 91.6% of its initial mass activities, which further highlights the key role of Ir-doping in determining catalyst performance. This work suggests that trace Ir-doping engineering could be a promising way to develop advanced electrocatalysts toward MOR for direct methanol fuel cell (DMFC) applications.
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