ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 6
·15991-16002
·
IF 5.19
Zhang Xueying,Liu Yonggang,Yu Yonghao,Wang Lifen,Lin Yinjun
Here, we report a simple and efficient strategy for evenly in situ growth of Cu 2 (OH) 3 F nanosheets on BiVO 4 spheres as a novel photo-Fenton-like catalyst using hydrothermal method. The Cu 2 (OH) 3 F/BiVO 4 composite catalysts showed great performance for the organic pollutants degradation under visible light irradiation due to the efficient electron transfer and copper species transformation. The synergetic between Cu 2 (OH) 3 F and BiVO 4 not only promoted the separation of electrons and holes but also enhanced the Cu 2+ reduction, thus produced more strong oxidative radicals under a wide pH value range. The activity of Cu 2 (OH) 3 F/BiVO 4 composite for methylene blue degradation was 6.03 and 5.47 times more than that of pristine Cu 2 (OH) 3 F and BiVO 4 , respectively. The composite catalysts were characterized with various methods and their stability and adaptability were also evaluated. Finally, a possible photo-Fenton-like reaction mechanism was also proposed based on the band structure/position and reaction species.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 10
·1-13
·
IF 6.408
Wang Fang,Shi Fengna,Chen Cheng,Huang Kexin,Chen Naipin,Xu Ziqi
Cobalt hydroxide nanoparticles (Co(OH) 2 NPs) were uniformly deposited on flexible carbon cloth substrate (Co(OH) 2 @CC) rapidly by a facile one-step electrodeposition, which can act as an enzyme-free glucose and uric acid sensor in an alkaline electrolyte. Compositional and morphological characterization were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS), which confirmed the deposited nanospheres were Co(OH) 2 nanoparticles (NPs). The electrochemical oxidation of glucose and uric acid at Co(OH) 2 @CC electrode was investigated by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), differential pulse voltammetry (DPV), and chronoamperometry methods. The results revealed a remarkable electrocatalytic activity toward the single and simultaneous determination of glucose and uric acid at about 0.6 V and 0.3 V (vs. Ag/AgCl), respectively, which is attributed to a noticeable synergy effect between Co(OH) 2 NPs and CC with good repeatability, satisfactory reproducibility, considerable long-term stability, superior selectivity, outstanding sensitivity, and wide linear detection range from 1 uM to 2 mM and 25 nM to 1.5 uM for glucose and UA, respectively. The detection limits were 0.36 nM for UA and 0.24 μM for glucose (S/N = 3). Finally, the Co(OH) 2 @CC electrode was utilized for glucose and uric acid determination in human blood samples and satisfying results were obtained. The relative standard derivations (RSDs) for glucose and UA were in the range 6 to 14% and 0 to 3%, respectively. The recovery ranges for glucose an UA were 97 to 103% and 95 and 101%, respectively. These features make the novel Co(OH) 2 @CC sensor developed by a low-cost, efficient, and eco-friendly preparation method a potentially practical candidate for application to biosensors. Graphical abstract
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DYES AND PIGMENTS
·
2022
·
IF 5.122
Lili He,Rui Liu,Chunhua Ge,Chunxue Ma,Li Yang,Xiangdong Zhang
Recently, carbon dots (CDs) have gained much attention in optoelectronic fields on account of their superior optical and environmentally friendly properties. Nevertheless, aggregation-induced quenching (AIQ) effect of solid-state CDs and thermal quenching caused by high temperatures severely hinders their further development. Herein, a novel wCDs/BNNS-OH hybrid nanostructure was synthesized by combining blue CDs (bCDs) and yellow CDs (yCDs) to the hydroxylated boron nitride nanosheets (BNNS–OH) surface. The uniform dispersion of CDs in BNNS-OH effectively alleviates the undesirable AIQ effect, and enables CDs/BNNS-OH composites to have color-tunable fluorescence characteristics. The wCDs/BNNS-OH/PVA composite film was obtained by encapsulating wCDs/BNNS-OH into polyvinyl alcohol (PVA). The film exhibits excellent luminescence stability in the air, ultraviolet light , water, and high-temperature environment. Meanwhile, since wCDs/BNNS-OH establishes an effective heat transfer channel in the PVA matrix, the working temperature of CDs in the wCDs/BNNS-OH/PVA film is greatly reduced. Moreover, the prepared wCDs/BNNS-OH/PVA film is flexible enough to retain the photoluminescence intensity unchanged after thousands of bending cycles. This high stability and heat dissipation wCDs/BNNS-OH/PVA composite film will facilitate the application of CDs in flexible and foldable lighting devices.
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ChemElectroChem
·
2022
·Vol. 9
·期 15
·e202200522
·
IF 4.782
Liying Ming,Xiao-Yuan Wu,Sa-Sa Wang,Weiming Wu,Can-Zhong Lu
Graphical Methanol to formate : Selective electrooxidation of methanol for the production of formate with high Faradic efficiency was easily implemented in a two-electrode configuration at high current densities, in which Co 2+ -doped Ni(OH) 2 nanosheets were facilely grown on Ni foam and were used as efficient porous electrodes. Co 2+ -doped Ni(OH) 2 nanosheets were grown on porous Ni foam by a simple electrodeposition method. The obtained samples were used as porous electrodes for selective electrocatalytic oxidation of methanol to formate in NaOH aqueous solution. The results indicated the oxidizing abilities of the as-prepared electrodes could be regulated by the doping content of Co 2+ for the electrooxidation of methanol, in which the electrode with a Co 2+ doping content of 10 mol % required a lowest potential of ∼1.32 V vs . RHE to achieve a current density of 100 mA cm −2 as compared with other electrodes. And the doping of Co 2+ helped boosting the Faradic efficiency for the electrocatalytic oxidation of methanol. Moreover, the electrooxidation of methanol for the production of formate (Faradic efficiency ≥96.5 %) with the simultaneous generation of hydrogen was easily implemented in a two-electrode configuration at high current densities (100–500 mA cm −2 ). The results of the durability test further revealed that the 10 mol % Co 2+ -doped Ni(OH) 2 electrode exhibited an outstanding stability for the electrocatalytic oxidation of methanol in the present system.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Gaiqin Miao,Lifei Liu,Xia An,Xu Wu
In this work, a high-performance CuNiAl-LDHs catalyst was innovatively synthesized for electrochemical carbon dioxide reduction (CO 2 RR) of methanol (CH 3 OH) through the modulated synthesis of Cu-based layered double hydroxide (LDHs). It was found that the optimal CuNiAl-LDHs has superior CH 3 OH selectivity compared to CuAl-LDHs and CuMgAl-LDHs, with the Faraday efficiency (FE) of 76.4% for CH 3 OH generation at −1.2 V. And their FE and current density (4.8 mA·cm −2 ) remained stable during up to 24 h of electrolysis. Meanwhile, this study confirms the significant performance advantages of CuNiAl-LDHs over their derived composite oxides. Series characterization further proves that the excellent catalytic performance of CuNiAl-LDHs is importantly associated with their richness in Cu + and hydroxyl group (—OH). The research expands the application fields of LDHs compounds. Meanwhile, the series of discoveries provide a new insight for the preparation of CH 3 OH by constructing CO 2 RR.
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MOLECULES
·
2023
·Vol. 28
·期 16
·6103
·
IF 4.6
Lanlan Wei,Yanan Chen,Dongliang Shao,Jingjun Li
In this work, a sensitive analytical method based on packed-nanofiber solid-phase extraction (PFSPE), after derivatization with trichloroacetic acid and high-performance liquid chromatography with a fluorescence detector (HPLC-FLD), has been established for the determination of aflatoxins (AFs) in milk. Polystyrene polymeric multi-walled carbon nanotube (PS-MWCNT/OH) composite nanofibers were fabricated by electrospinning and used to prepare homemade extraction columns. The extraction efficiency of the HPLC-FLD analysis method was sufficiently investigated and validated. After the implementation of optimal conditions, all of the analytes were separated efficiently and the components of the milk matrix did not disturb the determination. The obtained linear ranges of the calibration curves were 0.2–20 ng/mL for AFTB1 and AFTG2, 0.1–10 ng/mL for AFTB2, and 0.4–40 ng/mL for AFTG1. The recoveries ranged between 80.22% and 96.21%. The relative standard deviations (RSDs) for the intra-day and inter-day results ranged from 2.81–6.43% to 3.42–7.75%, respectively. Generally, 11 mg of sorbent and 200 μL of elution solvent were used to directly extract all of the AFs from the milk matrix. Reported herein is the first utilization of PS-MWCNT/OH-PFSPE HPLC-FLD to simultaneously analyze the occurrence of aflatoxins in milk.Keywords:aflatoxins;packed-nanofiber solid-phase extraction (PFSPE);sample preparation;polystyrene polymeric multi-walled carbon nanotube (PS-MWCNT/OH);milk
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Jialu Huang,Chengwei Deng,Yue Liu,Tingting Han,Feng Ji,Yuehua Zhang,Hongbin Lu,Ping Hua,Bowei Zhang,Tao Qian,Xiaolei Yuan,Yaoyue Yang,Yong Yao
Palladium (Pd) is supposed to be one of the most promising catalytic metals towards ethanol (C 2 H 5 OH) oxidation reaction (EOR). However, Pd electrocatalysts easily suffer from the poisoning of the intermediates (especially CO), resulting in the quick decay of EOR catalysis. Herein, inspired by the Brønsted-Lowry acid-base theory, a “attraction–repulsion” concept is proposed to guide the surface structure engineering toward EOR catalysts. Specifically, we induce Bi(OH) 3 species as Brønsted base onto PdBi nanoplates to effectively repel the adsorption of CO intermediates. The PdBi-Bi(OH) 3 nanoplates show an impressive mass activity of 4.46 A mg Pd -1 during the EOR catalysis and keep excellent stability. Both the stability and enhanced performance are attributed by the interfacial Brønsted base Bi(OH) 3 which can selectively attract and repel reactants and intermediates, as evidenced from in situ measurements and theoretical views.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Jia Cheng,Xiaoyang Yue,Caixia Chen,Xiaoping Shen,Shiping Zeng,Zhenyuan Ji,Aihua Yuan,Guoxing Zhu
Developing highly efficient, low-cost and stable electrocatalysts for oxygen evolution reaction (OER) is momentous to achieve the conversion and storage of sustainable energy. Herein, the CoFe(OH) x / GO composites with accordion-like CoFe(OH) x nanosheets clusters dispersed on graphene oxide (GO) sheets are prepared via a template-assisted route. It is found that the OER performance of the CoFe(OH) x / GO composites strongly depends on the content of GO and the mole ratio of Co/Fe. The optimized CoFe(OH) x / GO composites exhibit remarkably enhanced OER electrocatalytic activity in 1 M KOH with a low overpotential of 294 mV at 10 mA cm −2 and a small Tafel slope of 63.4 mV dec −1 , which are far superior to the corresponding Co(OH) 2 / GO and bare CoFe(OH) x . The enhanced electrocatalytic activity can be ascribed to the regulated electronic structure surrounding the active metal sites by introducing Fe, the improved conductivity by GO for faster charge transfer, and the accordion-like hierarchical structure with increased accessible active sites. This work demonstrates a comprehensive strategy to improve the electrocatalytic performance of transition metal hydroxide based OER catalysts.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2026
·
IF 3.3
Ma Yong-hu,Ma Fu,Zhao Tiao-bin,Gao Zi-yi,La Ying-hong,Zhao Hong-jian
Limited interfacial charge separation efficiency and insufficient redox capacity severely hinder the practical application of conventional Bi 2 WO 6 -based photocatalysts. To address these issues, a novel Bi(C 2 O 4 )OH/Bi 2 WO 6 heterojunction was constructed via a facile room-temperature one-pot liquid-phase deposition method. Multiple characterizations confirm the intimate interfacial contact between Bi(C 2 O 4 )OH nanorods and uniformly anchored Bi 2 WO 6 nanoparticles, accompanied by the introduction of abundant oxygen vacancies. On the basis of radical trapping experiments, EPR measurements, and electrochemical tests, an S-scheme charge-transfer model is proposed. This model retains the strong redox potentials of both semiconductors, while oxygen vacancies are speculated to act as efficient interfacial charge-trapping and transfer sites to synergistically promote the migration and separation of photogenerated carriers. The optimized 7%Bi(C 2 O 4 )OH/Bi 2 WO 6 composite achieves an RhB removal efficiency of 97.6% within 60 min for 50 mL of RhB solution (30 mg·L -1 ) under 5-W LED lamp irradiation. Radical trapping and EPR tests confirm that ·O 2 - , h⁺, and ·OH are the dominant active species. This work presents a facile and efficient room-temperature fabrication strategy for Bi-based heterojunctions and systematically elucidates the synergistic promotion mechanism between oxygen vacancies and the proposed S-scheme charge-transfer pathway, offering new insights for designing high-performance photocatalysts for organic wastewater remediation.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 48
·18342-18353
·
IF 4
Minghao Dou,Mengjie Yao,Kai Ding,Yuye Cheng,Hongyu Shao,Shenjie Li,Yanyan Chen
Heterostructures formed by combining semiconductor materials with different band structures can provide work functions, d-band positions and electronic properties different from bulk materials and are considered as an effective strategy to improve the catalytic activity through electronic modification. In this study, an efficient MoS2/Fe-Ni3S2/NF heterojunction material was prepared by a two-step hydrothermal method. With the help of flake Ni(OH)2 synthesized in the first step, growth sites were provided for flake Ni3S2. The electronic structure of Ni3S2 was optimized by Fe doping, while the construction of the MoS2/Fe-Ni3S2 heterostructure allowed the catalyst to expose more active sites. MoS2/Fe-Ni3S2/NF exhibited a small charge transfer resistance and excellent electrocatalytic performance. At a current density of 10 mA cm−2, only low overpotentials of 148 mV and 118 mV were required for the oxygen precipitation reaction (OER) and hydrogen precipitation reaction (HER), respectively. Notably, when MoS2/Fe-Ni3S2/NF is used as the anode and cathode for overall hydrolysis, only 1.51 V is required to reach a current density of 10 mA cm−2, demonstrating its great potential for application in hydrolysis. This work provides a feasible idea for the rational construction of non-precious metal bifunctional electrocatalysts with excellent performance.
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Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 2
·1003-1011
·
IF 11.9
Zhili Chang,Boyong Ye,Zixin Zhong,Songlin Wang,Han Wang,Weichen Du,Zhaoyin Hou
The synthesis and fabrication of new layered double hydroxide (LDH) materials are of great importance because of their versatility in catalysis, biosensors, supercapacitors, drug delivery and adsorption. In this work, Cu1Mg3Sc2(OH)12CO3 LDH and its derived Cu1/Mg3Sc2O6 catalyst with Sc3+ as the trivalent ion were synthesized for the first time. The composition and fine structure of Cu1Mg3Sc2(OH)12CO3 LDH and Cu1/Mg3Sc2O6 catalysts were characterized in detail. It was found that Cu1Mg3Sc2(OH)12CO3 LDH possesses larger cell parameters a (0.3170 nm) and c (2.3073 nm) than Cu1Mg3Al2(OH)12CO3. And the final Cu1/Mg3Sc2O6 catalyst possesses an enlarged surface area (260.8 m2 g−1), enhanced basicity (550 μmol g−1) and weaken acidity compared with those of Cu1/Mg3Al2O6. Finally, the Cu1/Mg3Sc2O6 catalyst was tested in the hydrogenation of waste polyethylene terephthalate (PET) derived dimethyl 1,4-cyclohexanedicarboxylate (DMCD) to 1,4-cyclohexanedimethanol (CHDM). It was found that the Cu1/Mg3Sc2O6 catalyst was highly active and selective for the conversion of DMCD to CHDM with 96.3% yield under mild conditions (250 °C, 2 MPa and WHSVDMCD = 0.49 h−1). And it can retain its performance for 300 h.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Qinglin Sheng,Duo Liu,Jianbin Zheng
In this paper, a sensitive novel non-enzymatic nitrite electrochemical sensor based on Pt nanoparticles loaded Ni(OH) 2 /Multi-Walled Carbon Nanotubes nanocomposites (Pt/Ni(OH) 2 /MWCNTs) was described. The composition and morphology of the Pt/Ni(OH) 2 /MWCNTs were characterized by transmission electron microscope and investigated energy dispersive X-ray spectra respectively. Results showed that the Pt nanoparticles could be anchored on the surface of the Ni(OH) 2 /MWCNTs uniformly through a simple reduction process. The electrochemical investigation of the sensor revealed that the Pt/Ni(OH) 2 /MWCNTs exhibited remarkable electrocatalytic performance toward nitrite oxidation , with a sensitivity of 145 μA mM − 1 cm − 2 and a low detection limit of 0.13 mM. Moreover, the obtained Pt/Ni(OH) 2 /MWCNTs modified GCE with excellent reproducibility and selectivity also allows for practical application. It is expected that the combination of noble metal with Ni(OH) 2 /MWCNTs could be expanded to enhance the catalytic performances of nanocomposites and used for the construction of high-sensitive electrochemical sensors.
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