WATER SCIENCE AND TECHNOLOGY
·
2021
·Vol. 83
·期 4
·841-853
·
IF 1.915
Li Dongmei,Li Wenjie,Zhang Quan,Wang Yizhi,Lin Hongyu,Feng Li,Li Shaoxiu,Deng Yue,Xiao Qiurong,Chen Jiongxi,Dong Qi
The promising synergistic electrocatalytic system of phosphate (PO 4 3− ) with the mediator cobalt(II) (for short E-Co(II)-PO 4 3− ) was employed to degrade cationic dye methylene blue (MB). The exploration in the electrocatalytic process revealed that the main intermediate active oxidation products were Co(III), accompanied with hydroxyl radicals and peroxodiphosphates (P 2 O 8 4− ). Their synergistic electrocatalytic degradation rate to MB and total organic carbon (TOC) was up to 100 and 60% in 40 min, respectively, which was 5 times and 2.6 times that in a direct electrocatalytic system, correspondingly. The degradation process of the E-Co(II)-PO 4 3− system on MB started with the bond being broken at the N-C junction of the MB molecule and intermediate active oxidation substances being generated, such as phenothiazine, 2-amino-5-(N-methylformamide) benzene sulfonic acid and N 1 ,N 1 -dimethyl-1,4 diaminobenzene. Then, the intermediates were degraded into aniline, phenol and benzene sulfonic acid, and eventually decomposed into inorganic substances like CO 2 and water. The electrocatalytic degradation mechanism of E-Co(II)-PO 4 3− system on MB was the combination of indirect oxidation of the intermediate oxidants like Co(III), P 2 O 8 4− and the hydroxyl radical with direct electrocatalysis on the platinum titanium electrode, where the electrocatalytic oxidation of Co(III) was dominant. Active Co(III) and peroxodiphosphate generated in a novel electrocatalytic system have synergistic electrocatalytic effect. MB removal rate reached 100% in 40 min in the novel electrocatalytic system with phosphate and the mediator cobalt(II). Co(III) is the dominant active oxidation substance in MB oxidation and mineralization.
研究领域:
环境化学
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电催化
·
环境污染与控制
·
高级氧化技术
·
环境功能材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Peidong Hong,Zijian Wu,Dandan Yang,Kaisheng Zhang,Junyong He,Yulian Li,Chao Xie,Wu Yang,Ya Yang,Lingtao Kong,Jinhuai Liu
Singlet oxygen ( 1 O 2 ) is an electrophilic species that has great selectivity for breaking down electron-rich refractory organic pollutants. However, in most cases, 1 O 2 plays a minor role in the Fenton-like process due to its low yield, the contributions of which are usually covered by free radicals. Here, we provide the first report on a type of hollow amorphous Co/C composites prepared for the efficient generation of 1 O 2 to degrade oxytetracycline (OTC) selectively in the Fenton-like system. The optimized Co/C samples (Co/C-3) obtained the best degradation performance of OTC near to 100% under neutral conditions, along with satisfactory reusability and stability. Additionally, it exhibited a high anti-interference capacity for inorganic anions and natural organic matter s in the different water qualities. XPS spectrum revealed that the electron cycle of ≡Co 2+ -O-C/H and ≡Co 3+ -O-C/H played a vital effect on the formation of 1 O 2 . Quenching experiments and EPR testing further verified that 1 O 2 converted from ·O 2 – was the dominant oxidative species, and no hydroxyl radical (·OH) appeared in this reaction. Moreover, the results of the Fukui function and T.E.S.T (Toxicity Estimation Software Tool) analysis provided significant assistance in the exploration of degradation pathways and ecological risks of OTC and its intermediates.
研究领域:
环境科学
·
材料科学
·
污染控制
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DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2016
·
IF 1.299
Yangyi Chen,Jie An,Qi Zhong,Peter Müller-Buschbaum,Jiping Wang
The smart control of cotton fabric comfort by cross-linking thermo-responsive random copolymer is investigated. The monomers 2-(2-methoxyethoxy) ethoxyethyl methacrylate (MEO2MA) and ethylene glycol methacrylate (EGMA) with a molar ratio of 17:3 are selected to synthesize the thermo-responsive random copolymer poly(2-(2-methoxyethoxy) ethoxyethyl methacrylate-co-ethylene glycol methacrylate), abbreviated as P(MEO2MA-co-EGMA). By using citric acid as a cross-linking agent, the obtained P(MEO2MA-co-EGMA) is successfully immobilized onto cotton fabrics. Smart control is achieved from the thermo-responsive behavior of the copolymer. Cross-linked P(MEO2MA-co-EGMA) will collapse when the ambient temperature exceeds its transition temperature. Therefore, the formerly compact P(MEO2MA-co-EGMA) layer will switch to a porous structure, and the air/moisture permeability of the textiles is enhanced. As the comfort of the textiles is closely related to the air/moisture permeability, a smart control of the cotton fabric comfort can be realized. In addition, the softness of cotton fabrics with and without thermo-responsive polymers does not show a prominent change, even when the applied solution concentration is as high as 16% (wt%). On the contrary, the stiffness of the cotton fabric coated with poly(N-isopropylacrylamide) (PNIPAM) is significantly higher than the original cotton fabric, indicating that homo PNIPAM is less suitable for textiles used in daily lives. Moreover, the whiteness and mechanical properties are studied and stay unchanged after cross-linking. As a consequence, the introduction of P(MEO2MA-co-EGMA) into textiles can provide textiles with smart control of cotton comfort, and it will not influence the wearabilities of the textiles.
研究领域:
纺织科学
·
聚合物化学
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材料科学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Bingjie Wang,Jun Li,Jianqiang Zhang,Huyan Li,Peng Chen,Qun Gu,Zongbao Wang
Acetylated chitin nanocrystals were prepared through surface modification, and biodegradable poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)/chitin nanocrystals films were produced via solution-casting method. Transmission electron microscopy observations and X-ray diffraction profiles revealed that the rod-like morphology and crystal structure of chitin nanocrystals were maintained. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy results showed that the hydroxyl groups were partly replaced by the acetyl groups on the surface of chitin nanocrystals. The hydrophobic performance of the acetylated chitin nanocrystals was significantly increased according to the contact angle measurements. Differential scanning calorimeter results indicated that the influence of chitin nanocrystals on the crystallization behaviors of PHBV matrix was changed from suppression to assistance after the surface modification. Tensile test showed that the tensile strength and Young's modulus of PHBV/acetylated chitin nanocrystals composites were improved by 44% and 67%, comparing to the improvement of 24% and 43% for PHBV/chitin nanocrystals composites with the addition of 5.0 wt.% nanocrystals into PHBV.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 10
·4439-4448
·
IF 2.817
Huang Xiangjin,Li Jianwen,Xie Chunsheng,Zhang Huasheng,Wei Shoulian,Lai Wenfeng,Xian Shaoling,Huang Sicong
Herein, a nanocomposite comprising polyvinyl pyrrolidone (PVP) and cobalt(II) hydroxide (Co(OH) 2 ) nanoparticles (PVP–Co(OH) 2 ) was synthesized via a hydrothermal method and used for detection of Cu(II) ions. Using PVP grafted nanosized Co(OH) 2 as a surfactant could decrease the aggregation and reduce the particle size. The conducted morphology investigations showed that PVP–Co(OH) 2 nanocomposite was composed of small spherical particles with a diameter of 40–80 nm that could accelerate mass diffusion and favor the deposition-stripping process of Cu(II) ions. High catalytic activity of Co(OH) 2 and good affinity of PVP to Cu(II) ions synergistically enhances sensing performance of the PVP–Co(OH) 2 nanocomposite-modified electrode than Co(OH) 2 - and PVP-modified electrodes. A linear response was obtained for Cu(II) ion concentration over a range of 1.0–90.0 μg/L, with a detection limit of 0.26 μg/L (S/N = 3). The proposed electrode exhibited good performance in terms of selectivity, stability, and reproducibility. It was also employed to detect Cu(II) ions in water and food samples, and the results were in good agreement with those obtained by graphite furnace atomic absorption spectrometry.
研究领域:
分析化学
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环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2025
·
IF 13.1
Jinshi Dong,Ting Li,Shengtong Li,Panpan Chang,Qianqian Jin,Jiaqiang Yang,Zhuangzhuang Lai
CO and C3H8, as typical inorganic and organic gaseous pollutants, respectively, require distinct oxidation catalysts for efficient conversion due to their unique properties. In this work, Pt catalysts with different crystal phases of TiO2 (anatase and rutile) as supports were fabricated and investigated for CO oxidation and C3H8 combustion. The surface nature of TiO2 dramatically affects the local environment and electronic properties of supported Pt. Pt-TiO2(R) exhibited superior activity for CO oxidation, whereas Pt-TiO2(A) showed higher reactivity for C3H8 total oxidation. It is concluded that Pt-TiO2(R) contains more oxygen vacancies at the interfacial Pt perimeter sites than Pt-TiO2(A) after reduction pretreatments, which facilitates CO oxidation through the Mars–van Krevelen (MvK) mechanism. The electron-deficient Pt in Pt-TiO2(A) promotes the adsorption and activation of C3H8, and the amount of charge transfer between Pt and adsorbate intermediates during C3H8 oxidation determines the preference of C-C cleavage or dehydrogenation. Lower charge transfer in Pt-TiO2(A) makes C–C cleavage more efficient and contributes to the total oxidation of C3H8. This work emphasizes the importance of engineering material’s local environment and electronic structure to design high-performance oxidation catalysts.
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xinyu Huo,Jinxing Gu,Baomin Luo,Fengyun Su,Yezhen Zhang,Dan Zhang,Ruili Shi,Bingxuan Qiao,Yixin Wang
Direct ethanol fuel cells (DEFCs) have received widespread attention due to their simple construction, low operating temperature, high conversion efficiency, high energy density, and being free of pollution. The sluggish kinetics, low C 1 pathway selectivity, and poor resistance to CO poisoning, however, remain great challenges for their development. In this work, porous PtBiTe nanoplates (PtBiTe NPs) with an average lateral size of 309.5 nm and an average thickness of 14.6 nm were facilely synthesized in aqueous solution at room temperature by using Bi 2 Te 3 nanoplate templates. The twodimensional porous structure exposes a large number of Pt active sites and has excellent structural stability. The introduction of Bi and Te modifies the electronic structure of Pt, weakens the energy barrier of the potential-determining step of the C 1 pathway, reduces the energy barrier of CO oxidation, and decreases the number of oxidized Pt atoms. PtBiTe NPs show excellent activity and stability, high C 1 pathway selectivity, and robust resistance to CO poisoning toward ethanol oxidation reaction in alkaline electrolyte, much superior to the commercial Pt/C catalysts.
研究领域:
电化学
·
纳米催化
·
能源材料
·
表面科学
·
燃料电池
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 23
·2300106
·
IF 13.3
Ziqin Liu,Xin Dong,Jing Wen,Pu Hu,Chaoqun Shang
The high reactivity of Li metal and the inhomogeneous Li deposition leads to the formation of Li dendrites and “dead” Li, which impedes the performance of Li metal batteries (LMBs) with high energy density. The regulating and guiding the Li dendrite nucleation is a desirable tactic to realize concentrated distribution of Li dendrites instead of completely inhibiting dendrite formation. Here, a Fe-Co-based Prussian blue analog with hollow and open framework (H-PBA) is employed to modify the commercial polypropylene separator (PP@H-PBA). This functional PP@H-PBA can guide the lithium dendrite growth to form uniform lithium deposition and activate the inactive Li. In details, the H-PBA with macroporous structure and open framework can induce the growth of lithium dendrites via space confinement, while the positive Fe/Co-sites lowered by polar cyanide (−CN) of PBA can reactivate the inactive Li. Thus, the Li|PP@H-PBA|Li symmetric cells exhibit long-term stability at 1 mA cm −2 for 1 mAh cm −2 over 500 h. And the Li-S batteries with PP@H-PBA deliver favorable cycling performance at 500 mA g −1 for 200 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Haihua Wu,Zhihua Wei,Junying Yin,Sen Jiang,Jiahao Wu,Shuanghao Zheng,Jinpeng He,Xin Xu,Yunfang Gao
Bimetallic sulfides have been suggested as a novel class of electrode materials for supercapacitors (SCs) due to their high conductivity, rich redox active sites and wide operating potential window. To improve the property, tremendous efforts have been devoted to controlling the morphology, structure and size of bimetallic sulfides. We report here a strategy to achieve Ni-Co sulfide hollow nanoboxes with rich lattice interfaces and widespread mesopores via ion-exchange process. The lattice interfaces in the nanoboxes play a key role in improving the performance by developing more active sites. The thin nano-shell with porous structure makes it highly permeable for efficient ion diffusion, yet shortens the electron transport pathway. Such synergistic effects endow the Ni-Co sulfide hollow nanoboxes with high specific capacity of 789.0 C g − 1 at 1 A g − 1 and excellent rate capability of 82.1% capacity retention at 20 A g − 1 . Quantitative analysis of capacitive contribution sheds light on the rapid charge-discharge kinetics. Additionally, the as-fabricated hybrid SC , using optimized Ni-Co sulfide (Ni/Co molar ratio: 1/1) as anode and active rice husk carbon as cathode, exhibits a high energy density of 46.7 Wh kg −1 at power density of 400 W kg −1 and remarkable cycling stability of 82.7% at 5 A g − 1 after 10,000 cycles, demonstrative of potential application for high-performance SCs.
研究领域:
材料科学
·
纳米技术
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 12
·期 3
·737-749
·
IF 6.119
Zhicheng Xu,Yuran Li,Yuting Lin,Bin Wang,Panting Gao,Tingyu Zhu
The reduction of NO by CO was proposed to be applied for regeneration gas to remove NOx from industrial flue gas with activated carbon purification technology. To improve the activity and sulfur resistance for the reduction of NO by CO in regeneration gas, Cu and Fe modifications on activated carbon were investigated. And various samples were characterized by XRD, XPS, TPD, H2-TPR, in situ DRIFTS and DFT calculations to explain the reaction mechanism and poisoning mechanism. The synergistic effects of oxygen-containing functional groups and metal sites show that –COOH acts as an anchor site for metals and that C–O–C acts as a protective site for Fe3+ under a SO2 atmosphere. Cu2+ sites have a high activity at low temperatures due to the large amount of adsorbed NO and the intermediate NOx− participating in the reaction with the NOx− pathway. Fe3+ sites have a high activity at high temperatures due to the high N–O dissociation activity with the *N pathway and –NCO pathway. DFT calculations proved that the binding Cu2+ and Fe3+ sites have higher activity than free Cu2+ and Fe3+ sites. A high content of SO2 exhibits various poisoning effects, mainly including the sulfation of metal sites, deposition of S, and consumption of CO. AC-Fe-H exhibits excellent resistance and stability against SO2 and H2O due to less S deposition caused by consumption through the S–CO reaction, slight sulfation caused by the protective effect of Fe2+ and C–O–C on Fe3+ sites and better hydrophobicity.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 33
·22472-22481
·
IF 4.123
Jiying Liang,Xue Yu,Tiangang Yang,Menglu Li,Li Shen,Yue Jin,Hongyun Liu
In this paper, poly(N-isopropylacrylamide-co-3-aminophenylboronic acid) (P(NIPAM-co-APBA)) copolymer films were successfully electropolymerized on the Au electrode surface. The electroactive probe ferrocene carboxylic acid (FCA) in solution showed reversible thermal-, glucose- and pH-responsive on–off cyclic voltammetric (CV) behaviors at the film electrodes. The comparative experiments demonstrated that the thermo-responsive property of the film electrode was ascribed to the PNIPAM component of the films, whereas the glucose- and pH-sensitive behaviors came from the PAPBA constituent. The reduced form of nicotinamide adenine dinucleotide (NADH) could be electrocatalytically oxidized by FCA at the film electrodes, which would greatly amplify the multi-responsive CV signal difference between the on and off states. On the basis of these results, a binary 4-input/4-output logic circuit was fabricated with temperature, glucose, pH and NADH as inputs and the CV responses at 4 different levels as outputs. Moreover, a ternary CONSENSUS logic circuit was established on the same platform, which was the first report on the combination of ternary logic gate and bioelectrocatalysis without using enzymes. This work provided a novel idea for constructing complicated biocomputing systems by increasing the number of inputs/outputs with multi-sensitive interfaces and by designing new types of multi-valued logic gates on the basis of bioelectrocatalysis.
研究领域:
生物计算系统
·
生物电化学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER
·
2021
·
IF 4.43
Lu Shi,Wei Liu,Yanhu Xue,Mei Hong,Xiangling Ji
Temperature Rising Elution Fractionation (TREF) is effective for separating polyolefin resins according to crystallizability. A relatively low isothermal crystallization temperature is necessary to fractionate poly(1-butene) (PB-1) resin because of its slow crystallization kinetics . This study aims to investigate the influence of isothermal crystallization temperature of TREF on the fractionation and chain microstructure of eluted fractions for one poly(1-butene-co-ethylene) with 5.8 mol% ethylene. The resin is fractionated using P-TREF under four different isothermal crystallization temperatures, i.e. 0 °C, −5 °C, −10 °C, and −30 °C, and then the fractions are characterized by high-temperature gel permeation chromatography (HT-GPC), 13 C nuclear magnetic resonance spectroscopy ( 13 C NMR), and differential scanning calorimetry (DSC) to acquire their chain microstructure information. The isothermal crystallization temperature significantly affects the nucleation and growth of the crystals, which consequently results in differences in the relative content of eluted fractions. With the decrease of isothermal crystallization temperature from 0 °C to −30 °C, the copolymer is fractionated more effectively since fractions are more evenly distributed among elution temperatures rather than concentrated at lower elution temperatures. Furthermore, the isothermal crystallization temperature influences the chain microstructure of fractions obtained at the same elution temperature, which are different in ethylene content, isotacticity, and average sequence length. The distribution of ethylene content and isotacticity becomes broader with the decrease in isothermal crystallization temperature. Lower isothermal crystallization temperature is conducive to effective separation of the fractions with weak crystallizability. These results are of great significance for the selection of fractionation conditions and chain microstructure analysis of poly(1-butene-co-ethylene) resins.
研究领域:
高分子化学
·
材料科学
·
聚合物表征
·
热分析
·
核磁共振波谱学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）