MOLECULES
·
2019
·Vol. 24
·期 17
·3041
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IF 3.06
Yanqing Liu,Gengxin Hu,Hongwu Wang,Su Yao,Yinjian Ye
A hybrid nanocomposite consisting of hydroxylated multi-walled carbon nanotubes (MWCNTs−OH) and cube mesoporous carbon (CMK−8) was applied in this study to construct an MWCNT−OH/CMK−8/gold electrode (GE) electrochemical sensor and simultaneously perform the electro-reduction of olaquindox (OLA) and carbadox (CBX). The respective peak currents of CBX and OLA on the modified electrode increased by 720- and 595-fold relative to the peak current of GE. The performances of the modified electrode were investigated with electrochemical impedance spectroscopy, cyclic voltammetry, and differential pulse voltammetry. Then, the modified electrodes were used for the individual and simultaneous determination of OLA and CBX. The fabricated sensor demonstrated a linear response at 0.2–500 nmol/L in optimum experimental conditions, and the detection limits were 104.1 and 62.9 pmol/L for the simultaneous determination of OLA and CBX, respectively. As for individual determination, wide linear relationships were obtained for the detected OLA with levels of 0.05–500 nmol/L with LOD of 20.7 pmol/L and the detected CBX with levels of 0.10–500 nmol/L with LOD of 50.2 pmol/L. The fabricated sensor was successfully used in the independent and simultaneous determination of OLA and CBX in spiked pork samples.Keywords:CMK−8;MWCNTs−OH;electrochemical sensor;differential pulse voltammetry;simultaneous determination;carbadox;olaquindox
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Ruixia Yuan,Jincheng Liu,Zhijun Li,Yanguang Chen,Zhaohui Wang,Zhanjian Liu,Guolin Jing,Yanji Zhu,Huaiyuan Wang
Single-stage oil/water separation membranes usually suffer from weak chemical stability, susceptible mechanical damage and relatively low permeating flux, and the sophisticated preparation processes also limit their massive utilization. In this work, Cu(OH) 2 nanoneedles coated copper mesh (CM) is prepared by simple and eco-friendly anodic oxidation at a current density of 4 mA/cm 2 for 6 min, which is the most efficient route reported so far. The mesh exhibits outstanding superhydrophilicity and underwater superoleophobicity towards various oils with contact angles up to 164.9°, achieving superior oil/water separation efficiency of above 99.5% and ultrahigh permeating flux of 191 160 L·m −2 h −1 solely driven by gravity. Impressively, the Cu(OH) 2 /CM demonstrates excellent chemical stability and anti-fouling performance when exposed to acidic and strongly alkaline solutions, saturated NaCl solution and various organic solvents . High durability to withstand mechanical challenges, e.g. high-power sonication and sand abrasion, is experimentally confirmed owing to strong cohesional strength of Cu(OH) 2 nanoneedles on CM surface. Importantly, the Cu(OH) 2 /CM exhibits favorable long-term recyclability with stable microstructure morphologies even after 50 cycles. These distinct advantages endow the Cu(OH) 2 /CM to be an ideal candidate to efficiently separate oil pollutants from water. The oil/water separation mechanisms are proposed based on the concept of intrusion pressure.
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ACS Catalysis
·
2018
·
IF 11.384
Cheng Liang,Qiyi Ma,Haoran Yuan,Yongtao Wang,Jianyong Mao,Zhirong Chen,Jia Yao,Haoran Li
An investigation of aerobic oxidation of 2-methoxy-4-methylphenol to vanillin catalyzed by a number of cobalt salts, complexes, oxides, and hydroxides in alkaline solutions is reported. A good yield of vanillin (90%) was obtained when CoCl2 was used as the catalyst, while a poor yield (6%) was obtained with Co3O4. Unexpectedly, however, the Co3O4 catalytic activity was restored after heating in an alcoholic solution of NaOH for 24 h, producing a good yield of vanillin (85%). The recovered catalytic activity of Co3O4 indicated a conversion of inactivated heterogeneous particles to activated particles. In addition, precipitates were generated when “homogeneous” CoCl2 was employed as a catalyst, making us wonder about the true nature of the catalyst in this reaction. A series of experiments are described, including kinetic studies, filtration tests, centrifugation tests, dynamic light scattering, transmission electron microscopy, X-ray photoelectron spectroscopy, and powder X-ray diffraction, for the investigation of the true catalyst under catalytic conditions. The key observations led to the conclusion that the cobalt salts and complexes act as precatalysts that transform to cobalt oxide/hydroxide [CoOx(OH)y] nanoparticles, which is responsible for the benzylic C(sp3)–H oxyfunctionalization of 2-methoxy-4-methylphenol. Additionally, the size of the particles is decisive for catalyst performance. The nature of the active nanoparticles was also studied. With regard to the identification of homogeneous or heterogeneous catalysis, this study provides a complement to existing catalytic reaction types.
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JOURNAL OF MATERIALS RESEARCH
·
2015
·Vol. 30
·期 10
·1639-1647
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IF 1.647
Xueming Liu,Chunge Niu,Xinping Zhen,Jide Wang,Xintai Su
A phase transfer method was developed to prepare Mg(OH)2 nanosheets and a subsequent adsorption–calcination process was followed to obtain lamellar MgO nanostructures. The as-prepared MgO nanosheets also showed a superior adsorption property of Congo red. Transmission electron microscopy and x-ray diffractometer results indicated that the as-obtained Mg(OH)2 was plate-shaped with a hexagonal crystal structure where MgO possessed a lamellar structure with a cubic phase. The maximum adsorption capacities of Mg(OH)2 and MgO were reached up to 1820 and 2650 mg g−1, respectively. The high adsorption capacity might be related to the particle geometry and large surface area (87.97 m2 g−1 for Mg(OH)2 and 132.31 m2 g−1 for MgO). The adsorbents can be easily regenerated for five times without any significant loss in their adsorption property. The adsorption behaviors of the Mg(OH)2 and MgO adsorbents showed that the adsorption kinetics and isotherms were in good agreement with pseudo-second-order rate equation and Freundlich adsorption model.
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IONICS
·
2015
·Vol. 22
·期 4
·573-579
·
IF 1.754
Ma Wenle,Xue Junying,Cui Hongtao
Hexagonal β-Ni(OH) 2 nanosheets with thickness of ∼12 nm were synthesized by a hydrothermal method at 150 °C using nickel chloride as nickel source and morpholine as alkaline. Electrodes for application in pseudocapacitor were assembled through a traditional technique: pressing a mixture of β-Ni(OH) 2 nanosheets and acetylene black onto nickel foam. Due to the hexagonal shape of rigid β-Ni(OH) 2 nanosheet and the mediation of surface-modified glycerol during electrochemical charge–discharge cycles, a nanostructure of electrode material with facile interior pathway for the transfer of electrolyte was formed. As a result, the as-formed electrodes presented high specific capacitance of 1,917 F g −1 at current density of 1.6 A g −1 in 3 mol L −1 KOH solution. At high charge and discharge current density of 31.3 A g −1 , the electrodes still remained a high specific capacitance of 1,289 F g −1 . The interesting results obtained from this investigation may provide a new insight for the synthesis of electrode materials with high electrochemical performance.
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LANGMUIR
·
2025
·
IF 3.9
Denghui Huang,Xiaolan Fu,Kaixin Wang,Zicheng Zheng,Liyuan Zhang,Zhizhen Ye,Jie Jiang,Zhong-kang Han,Liping Zhu
Oxygen vacancies play a crucial role in charge transport and surface states in semiconductor metal oxides, significantly influencing various research fields, such as photocatalysis and gas sensor. Developing effective strategies to generate oxygen vacancies and thereby enhance device performance is highly desirable. In this study, we proposed a water-based one-step electrospinning method to introduce hydroxyl groups, leading to the synthesis of Pt-decorated WO3 nanofibers (Pt-WO3(H2O)) with increased oxygen vacancies. Density functional theory calculations revealed that the dissociation energy of W–OH is lower than that of the W–O bonds, promoting the formation of oxygen vacancies via W–OH bond cleavage. These vacancies reduced the adsorption energy of acetone on the WO3 surface, enhancing surface interactions. Consequently, the Pt-WO3(H2O) sensor exhibited an ultrahigh response of 82 to 1.8 ppm acetone at 300 °C, which was about 1 order of magnitude higher than the one fabricated by conventional electrospinning. These findings indicate that water-based electrospinning is an effective technique for generating oxygen vacancies in metal oxide nanofibers. Our high-performance acetone sensor, capable of detecting low concentrations, holds great potential for applications in noninvasive health screening.
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SEMICONDUCTOR SCIENCE AND TECHNOLOGY
·
2025
·Vol. 40
·期 3
·035006
·
IF 2.1
Xingyu Zhang,Lingling Wang,Yawei Wang,Xiangyang Zhao,Rong Fang,Rui Guo,Yue Zhou,Xintong Zhang,Yichun Liu
Modifying the back contact interface plays a key role in improving the efficiency of Cu2ZnSn(S,Se)4 (CZTSSe) solar cells. Aiming at the phase decomposition and carrier recombination issues in the CZTSSe/Mo back contact interface, an ultra-thin Mg(OH)2 intermediate layer was introduced between the Mo substrate and the CZTSSe absorber layer. The Mg(OH)2 intermediate layer effectively suppressed the interface phase decomposition reactions and inhibited the generation of interface secondary phases. Meanwhile, during the high-temperature selenization process, the Mg2+ doped into CZTSSe at the back contact interface, reducing the defects and band offset at the CZTSSe/Mo interface. The performance of the device was improved, with a significant increase in efficiency compared to the control device. This work highlights the modification effect of Mg(OH)2 for improving back contact and also provides an easy-handling method to achieve high-performance CZTSSe solar cells.
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Journal of Coatings Technology and Research
·
2025
·
IF 2.8
Wang Mingwu,Zhong Fei,Chen Chunlin,Wang Xinyi,Bai Xinyu,Liu Long
Graphitic-phase carbon nitride (CN) is a potential flame retardant due to its unique two-dimensional structure and thermal properties. Here, hexachlorocyclic triphosphate was grafted onto CN to form organic–inorganic crosslinked nanosheets (CPH) through the abundant reactive groups of polydopamine. Then the nickel hydroxide nanosheets were loaded onto the surface of CPH to obtain CPH@Ni(OH) 2 hybrids. The combination of Ni(OH) 2 and CPH can achieve multiple flame-retardant effects with excellent catalytic char formation and gas-phase flame-retardant properties. The results show that CPH@Ni(OH) 2 /EP has the highest residual char (30.2%) in the thermogravimetric experiments, which lays the foundation for its high adiabatic properties. Compared with other samples, the CPH@Ni(OH) 2 /EP sample exhibits the largest expansion height (24.1 mm), the largest expansion rate (18.83), and the smallest smoke density (38.6%), which indicates a significant increase in the expansion height and smoke suppression properties. The SEM reveals a denser and more complete residual char layer for the CPH@Ni(OH) 2 /EP samples. Some metal oxides were embedded in the residual char, which was essential for improving the heat resistance and strength of the char layer. Evidently, CPH@Ni(OH) 2 can effectively improve the flame-retardant properties of epoxy coatings.
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Journal of Energy Storage
·
2024
·
IF 8.9
Jing Sun,Jing Li,Yuanyuan Liu,Kaihua Liu,Meiri Wang,Hongtao Cui
Ni(OH) 2 is a typical battery-type material with high theoretical specific capacity. Its two inherent disadvantages, namely slow electrochemical dynamics and extremely poor cycling life, have become stumbling blocks for its application in supercapacitors (SCs). The hitherto slow advancement in the electrochemical performance of Ni(OH) 2 implies a misunderstanding of its electrochemical mechanism and inappropriate building strategies of the structure. In this work, we build a structure of porous carbon-confined α-Ni(OH) 2 using Mg-MOF-74 as a sacrificial template. The carbon matrix acts as the conductive network and the porous substrate for self-healing the damaged structure caused by the dissolution-precipitation of α-Ni(OH) 2 and suppressing the dissolution-recrystallization behavior of β-Ni(OH) 2 transformed from α-Ni(OH) 2 . Due to the thin sheet morphology and the retention of this morphology throughout cycling, the porous carbon-confined Ni(OH) 2 demonstrates excellent high-rate performance, and an ultra-long cycling life comparable to the carbon materials of electrical double layer capacitors (EDLCs). The assembled SCs also exhibit a high power density of 10.8 kW kg −1 and an energy density of 40.9 Wh kg −1 . The positive result in this work may offer a promising strategy for obtaining SCs with both high energy and power densities.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Fenglong Wu,Xiao Tian,Jin Song,Ying Zhang,Wei Li
The activation of the water molecule (H₂O) serves as the rate-determining step for hydrogen (H 2 ) evolution from the photo-assisted hydrolysis of ammonia borane (NH₃BH₃). Therefore, developing a low-cost efficient catalyst that can expedite the cleavage of O H bonds in H₂O is needed for improving hydrogen production efficiency in practical applications. Here, we prepared a supported non-noble metal catalyst (Co/Mo@MoO 2 –200) with a large number of active sites, comprising ultrathin low-crystalline cobalt (Co) nanosheets grown on amorphous molybdenum oxide (MoO 2 )-coated molybdenum (Mo) nanoparticles (Mo@MoO 2 –200), which serves as a high-performance non-noble metal catalyst to accelerate the activation of O H bonds in H 2 O. Notably, visible light irradiation facilitates the formation of ultrathin Co nanosheets by inducing the localized surface plasmon resonance of MoO 2 , as verified by transmission electron microscopy (TEM) images. Moreover, X-ray absorption near-edge structure (XANES) and X-ray photoelectron spectroscopy (XPS) spectra confirm the electron transfer from Co nanosheets to O sites in Mo@MoO 2 –200, establishing robust interfaces. Co/Mo@MoO 2 –200 exhibits high catalytic performance with the turnover frequency (TOF) value of 110.8 min −1 under visible light irradiation, which is greater than that of Co/Mo by 1.21 times and most of the reported Co-based catalysts. DFT calculations reveal that the Mo@MoO 2 –200 support in the catalyst can promote the Co-adsorption of NH 3 BH 3 and H 2 O, while facilitating H 2 desorption. Particularly, the Co/Mo@MoO 2 –200 can significantly decrease the activation energy barrier of the O H bond in H 2 O, compared with pristine Co and Mo@MoO 2 –200. This paper presents a flexible catalyst design strategy for NH 3 BH 3 hydrolysis and other H 2 O-associated catalytic reactions.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Lei Zhao,Zilong Zhang,Tianyuan Zhang,Xiang Wang,Huanjun Peng,Jingdong Peng
The Fenton reaction in advanced oxidation processes is an ideal pathway for the generation of highly reactive hydroxyl radicals (•OH). However, its application in organic wastewater treatment is limited due to the requirement for acidic pH conditions and the additional introduction of H2O2 and Fe2+. In this study, FeOOH–CN/Ni(OH)2 composites were constructed as photocatalysis-self-Fenton catalysts by the amorphous FeOOH, which was uniformly anchored onto the surface of pure g-C3N4 (carbon nitride (CN)), and Ni(OH)2 was assembled on top. In this process, FeOOH–CN/Ni(OH)2 achieved self-sufficiency in H2O2 production while enabling efficient degradation of tetracycline hydrochloride (TCH) over a wide pH range, with a degradation ratio of up to 98.82%, and a first-order reaction rate constant (k) was determined to be 0.04925 min–1, representing a 10.15 times enhancement compared to the pristine CN. A reasonable S-scheme heterojunction charge migration mechanism was demonstrated based on valence-band X-ray photoelectron spectroscopy (VB-XPS), atomic force microscopy (AFM) equipped with a Kelvin probe force microscope, and density functional theory (DFT) theoretical calculations. Furthermore, degradation experiments demonstrated that the catalyst possesses remarkable degradation efficiency for other contaminants as well. On one hand, this significant improvement can be attributed to the formation of an S-scheme heterojunction between Ni(OH)2 and CN, which not only increased the specific surface area of the composite but also remarkably enhanced the separation and transfer efficiency of photogenerated charges. On the other hand, the synergistic effect between Ni and Fe effectively facilitated the activation of H2O2 and promoted the cycling of Fe3+/Fe2+. This study provided an efficient visible-light-driven photocatalysis-self-Fenton system, offering novel perspectives for enhancing Fenton-based processes and advancing the application of Fenton reactions in the treatment of organic wastewater.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Lu Li,Shiyu Ma,Huimin Liu,Zixuan Zeng,Qijie Li,Chunlin Song,Jingang Yang
Ammonia borane (NH 3 BH 3 ) as a solid chemical hydrogen storage material with a high hydrogen content can be hydrolyzed under mild conditions to release hydrogen. In this work, Fe–Ni–B/Cu(OH) 2 –Cu foam was synthesized by combining in situ growth and electroless plating. Compared with the binary Fe–B/Cu(OH) 2 –Cu foam and Ni–B/Cu(OH) 2 –Cu foam prepared by the same method, the ternary Fe–Ni–B/Cu(OH) 2 –Cu foam has superior catalytic performance. The Fe–Ni–B/Cu(OH) 2 –Cu foam catalyst was able to achieve a maximum hydrogen production rate of 5.6 ml min −1 cm −2 at 298 K with an activation energy as low as 46.3 kJ mol −1 . And more importantly, its catalytic efficiency has hardly decayed after ten cycles. These excellent properties are due to its low activation energy and the large specific surface, multi–site Cu(OH) 2 –Cu–foam carrier.
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