MATERIALS CHEMISTRY AND PHYSICS
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2023
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IF 4.6
Li Zheng,Song Luo,Sijie Yang
Carbon steel is a widely used metallic material. It is prone to corrosion. In this study, we designed and fabricated a superhydrophobic layer with corrosion resistance for protection of carbon steel substrate. Multiple layers were formed that acted as barriers to protect the substrate from corrosion. This superhydrophobic layer reduced the contact area between the substrate and the corrosive medium owing to the superhydrophobicity. The experimental results showed that a copper layer uniformly covered the carbon steel substrate, and the outer surface of the copper layer was converted into copper oxide , which had a multi-scale structure. The Cu/CuO double layer was modified with stearic acid (SA) to form a Cu/CuO@SA superhydrophobic layer. The superhydrophobic layer exhibited a high water contact angle (up to 160°) and a low sliding angle (<3°). The superhydrophobic layer also exhibited repulsive effect to salt, acidic and alkaline solutions. Atmospheric stability test and UV irradiation test were conducted and the results indicated that the superhydrophobic layer was stable throughout the test period. The corrosion potential of the superhydrophobic sample was −0.18 V and the corrosion current density was 7.72 × 10 −7 A cm −2 , which was one order of magnitude lower than that of the carbon steel substrate. These results indicate that the superhydrophobic sample had a low corrosion tendency and corrosion rate. The polarization resistance and impedance modulus of the superhydrophobic sample were two orders of magnitude higher than the bare steel sample, indicating corrosion resistance and effective protection to the carbon steel substrate.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Lu Cui,Di Wu,Xiaomei Liu,Yang Li,Xiaobin Fan,Fengbao Zhang,Guoliang Zhang,Wenchao Peng
In this study, free-standing Co 3 O 4 -CuO/CF electrodes are synthesized via an electrodeposition-annealing process and then protected by dip-coated carbon nanotubes (CNTs). The obtained Co 3 O 4 -CuO@CNTs/CF is employed as cathode to activate peroxymonosulfate (PMS) for the degradation of Bisphenol A (BPA) in an electrochemical system. The electrochemical assistant (EA) plays a critical role to accelerate metal redox by donating electrons sustainably, and the fast regeneration of Co 2+ /Cu + could be achieved to promote chemical-catalysis for PMS activation, which is proved via the pre-electroreduction treatment. The rate constant of Co 3 O 4 -CuO@CNTs/CF/PMS system with EA is ∼ 4.4 times compared to the system without EA. It also exhibits an excellent stability, which could still remove over 90% of BPA after eight cycles in 45 min. In addition, the coating of CNTs could decrease leaching of metals effectively. According to quenching tests and electron spin-resonance spectroscopy (ESR), the presence of EA could enhance the radical route by producing more SO 4 •− and •OH greatly, which is also proved by much faster degradation of carbamazepine (CBZ) and atrazine (ATZ) than that without EA. This work reveals activation mechanism of PMS in the electrochemical system, and provides an effective strategy to achieve the fast metal redox cycle for effective and long-term pollutant degradation.
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高影响因子
FUEL
·
2023
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IF 7.4
Xinjian Zhou,Ruixuan Xu,Hongqi Nie,Qilong Yan,Jun Liu,Yunlan Sun
Burning rate modulation is a crucial but challenging technology for designing solid propellants. The core–shell structured Al@AP and Al@AP/CuO were prepared and their thermal reaction properties were investigated at different pressures. The precise catalytic mechanism of doped CuO in oxidizer and the key reason for its burning rate modulating effect on solid propellants were elucidated by combining DFT calculations. The *NH 4 ClO 4 on the CuO (1 1 1) surface is more likely to undergo a dehydrogenation reaction first. The large difference in activation energy between *NH 4 ClO 4 →*NH 3 +*ClO 4 +*H and *NH 4 ClO 4 → NH 3 + HClO 4 explains the reasons that CuO can reduce the ignition delay of the Al@AP. CuO promotes the decomposition of the AP@Al at the low- and high-temperature decomposition (LTD and HTD) stage. For the Al@AP-CuO, the temperature of the high-temperature decomposition peak (THTD) does not shift to the lower temperature range with increasing pressure. These results are responsible for a reduction of pressure exponent in the presence of minor CuO as reported in the literature. CuO can facilitate the transformation process *NH 3 →*NH 2 on the CuO (1 1 1) surface at low-temperature and low-pressure conditions. However, at high-temperature and high-pressure conditions, it can inhibit the reaction *NH 2 →*NH→*N, so the burning rate of solid propellants can be controlled.
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ACS Omega
·
2023
·
IF 4.1
Yanghao Meng,Hongbiao Du,Shuai Lu,Yanwei Liu,Jinglai Zhang,Hualong Li
Hydrothermal liquefaction (HTL) is one of the most promising technologies for biofuel production. The preparation and application of catalysts for HTL have been the research focus in recent years. In this study, a new synergistic catalytic process strategy is proposed. CuO–CeO2/γ-Al2O3 was used as an in situ hydrogen donor catalyst and Ni–Co/SAPO-34 was synthesized for hydroprocessing to improve bio-oil production process. The results of XRD and XPS demonstrated that the metal components were well supported on the catalyst. When the two catalysts were mixed, the yield of bio-oil increased from 51.00% to 64.51%, the carbon recovery rate raised from 69.53% to 88.18%, the energy recovery rate grew from 63.42% to 80.22%, and the S content is relatively reduced by 83.3%. Also, TG analysis showed that the content of light components in bio-oil increased. Moreover, the hydrocarbons and alcohols were observed to a higher proportion from the GC-MS analysis. This new method still has high catalytic activity after repeated use for five times. This study provides a new idea for preparing higher yield and superior quality bio-oil.
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高影响因子
Catalysts
·
2022
·Vol. 13
·期 1
·70
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IF 4.501
Wei Chen,Huan Shen,Xiaoxiao Zhu,Guoli Liu,Chuanqi Pan,Fajun Huang,Yarong Fang,Yanbing Guo,Zhu Luo
In this study, CuO loaded on anatase TiO2catalysts (CuO/anatase) with oxygen vacancies was synthesized via reduction treatments by NaHB4and H2(CuO/anatase-B, CuO/anatase-H), respectively. The characterizations suggest that different reduction treatments bring different concentration of oxygen vacancies in the CuO/anatase catalysts, which finally affect the CO catalytic performance. The CuO/anatase-B and CuO/anatase-H exhibit CO conversion of 90% at 182 and 198 °C, respectively, which is lower than what occurred for CuO/anatase (300 °C). The XRD, Raman, and EPR results show that the amount of the oxygen vacancies of the CuO/anatase-H is the largest, indicating a stronger reduction effect of H2than NaHB4on the anatase surface. The in situ DRIFTS results exhibit that the Cu sites are the adsorption sites of CO, and the oxygen vacancies on the anatase can active the O2molecules into reactive oxygen species. According to the in situ DRIFTS results, it can be concluded that in the CO oxidation reaction, only the CuO/anatase-H catalyst can be carried out by the Mvk mechanism, which greatly improves its catalytic efficiency. This study explained the reaction mechanisms of CO oxidation on various anatase surfaces, which offers detailed insights into how to prepare suitable catalysts for low-temperature oxidation reactions.Keywords:CuO/anatase;H2reduction treatment;oxygen vacancies;CO catalytic oxidation;CO reaction mechanism
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
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IF 3.141
Hongqin Ma,Xiao Sun,Meijie Wang,Jiasheng Zhang
This research focused on the removal of dibenzothiophene (DBT) from model diesel oil using CuO-loaded γ-Al2O3–reduced graphene oxide (CuO/γ-Al2O3–RGO) as an adsorbent, which possesses the highest adsorption capacity among reported regenerable graphene-related materials. The boehmite–RGO supports were synthesized using a one-pot hydrothermal synthesis method. As the RGO sheet surfaces are completely covered and isolated by boehmite nanorods formed via hydroxyl condensation of [Al(OH)x](3–x)+ or Al(OH)3 and the −OH of graphene oxide (GO), the specific surface area of boehmite–RGO increased to 378 m2/g, which is 20.8% higher than that of RGO (313 m2/g). CuO/γ-Al2O3–RGO adsorbents with different CuO contents were prepared, and their DBT adsorption desulfurization properties were evaluated. With a 2% mass ratio of CuO to boehmite–RGO, CuO/γ-Al2O3–RGO displays the highest DBT adsorption capacity (6.0 mg S/g) under ambient conditions, which improved by 53.8% in comparison with that of pure RGO (3.9 mg S/g). Moreover, the regeneration of the CuO/γ-Al2O3–RGO adsorbent is much more practical than that of the pure RGO adsorbent.
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ENVIRONMENTAL TECHNOLOGY
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2018
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IF 1.666
Xiaojing Zhang,Yue Zhou,Nan Zhang,Siyu Zhao,Han Zhang,Hanfei Zhai,Jie Zhang
Completely autotrophic nitrogen removal over nitrite (CANON) process was an innovative technology for nitrogen removal from wastewater. It is necessary to clear the impact of CuO nanoparticles (CuO NPs) on CANON process since the widespread utilize increased their opportunity for entering into wastewater. In this study, the short-term and long-term effects of CuO NPs on the ammonia removal and extracellular polymeric substance (EPS) secretion were analyzed in the presence of nitrite, with the CuO NPs of 0, 5, 10, 20, 50, 100, 200, and 500 mg L−1, respectively. Results suggested that low concentration of CuO NPs could enhance the ammonia removal. The inhibition threshold of CuO NPs on CANON sludge within short-term exposure was 20 mg L−1, while that of long-term exposure was 10 mg L−1. Both short-term and long-term exposure within CuO NPs significantly impacted the ammonia removal, and both the nitrite and CuO NPs influenced the EPS secretion.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
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IF 7.65
Huiyu Liang,Ke Xiao,Liyan Wei,Bo Yang,Gang Yu,Shubo Deng,Huabo Duan,Caizhen Zhu,Juying Li,Junmin Zhang
A novel CuO-CeO 2 -CoO x nanocatalyst was prepared for heterogeneous Fenton-like reaction to break the Ni 2+ -chelate into free Ni 2+ in electroless nickel plating wastewater, followed by separation of Ni 2+ in an insoluble form. The composite nanocatalysts prepared by co-precipitation method were characterized by XRD, TEM, and XPS, et al. Its catalytic activity as Fenton-like reagent was evaluated by the removal efficiency of Ni(II)-citrate after decomplexation and postprecipitation treatment. Subsequently, the effects of operating parameters on the decomplexation efficiency of the nanocatalysts were investigated including calcination temperature of catalysts, H 2 O 2 concentration, catalyst dosage, initial pH and reaction temperature. Under optimized condition, the Ni(II)-citrate complexes ( C 0 = 1.0 mM) achieved the complete decomplexation (>99.9%) within 60-min reaction using 0.3 g/L of CuO-CeO 2 -CoO x calcined at 450 °C and 75 mM of H 2 O 2 at pH 3.0 under 50 °C of reaction. Then, Ni 2+ after decomplexation could be completely removed by the subsequent precipitation at pH 11.0. In addition, the life test of CuO-CeO 2 -CoO x catalyst indicated that, after recycled 10 times, its activity for decomplexation of Ni(II)-citrate decreased no more than 8%. As a result, this new heterogeneous Fenton-like process is promising for decomplexation and purification of electroless nickel plating wastewater as a sludge reduction technology.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuan Zhang,Dong Wang,Gaili Liu,Kun Wang,Shaomin Shuang,Chuan Dong
2-Mercaptobenzothiazole (MBT), commonly employed in the rubber and metal industries, poses a significant environmental hazard, detrimental effects on aquatic ecosystems and potential carcinogenicity in humans. Urgent measures are warranted to develop practical strategies for MBT analysis and mitigation. This study introduces a novel nanozyme sensor, orderly consistent with dendritic mesoporous silica nanoparticle (DMSN), CuO nanoparticle cargo, and MnO 2 shell (designated as DMC), engineered for both MBT detection and degradation. By harnessing oxidase-like MnO 2 and peroxidase-like CuO mediated singlet oxygen ( 1 O 2 ), superoxide anion radicals (O 2 •- ), and hydroxyl radicals (•OH) generation, combining with the MBT-triggered colorimetric change of 3,3′,5,5′-tetramethylbenzidine (TMB), the absorbance and colorimetric methods with a broad linear detection range spanning 0.25 to 30 μM and 122 nM limit of detection are established. Furthermore, leveraging the evident ROS production by the nanozymes, DMC exhibits the advanced capability to modulate MBT levels and notably mitigate its biotoxicity oxidatively due to the ultrahigh reactive •OH from CuO nanoparticle compare with the MnO 2 . This research presents a facile and cost-effective approach for MBT detection while contributing positively to MBT management and environmental preservation efforts.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Na Li,Shixu Chen,Cong Zhang,Haiyan Zhao,Min Cui,Bao Sun
Vanillic acid is a phenolic compound which has antioxidant properties and plays an essential role in the prevention of several degenerative diseases, including cancer and atherosclerosis. This work reports the development and application of a electrochemical sensor for vanillic acid detection by a composite material (Cu 2 O-CuO-W 3 O-W 2 C) using polyoxometal-based metal–organic frameworks (POMOFs) as precursor through thermal decomposition. The synthesized Cu 2 O-CuO-W 3 O-W 2 C have high electrical conductivity and excellent electrocatalytic performance. The electrochemical sensor displays a linear response between the current density and concentration of vanillic acid (50–1100 μM) with a lowest detection limit of 1.439 μM under optimal conditions. The sensor was also demonstrated for the determination of vanillic acid in different real samples (fruit juice and fruit peel) and satisfactory results were obtained.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xike Tian,Lin Liu,Yong Li,Chao Yang,Zhaoxin Zhou,Yulun Nie,Yanxin Wang
Detection of pesticides in ground water has become a very important and crucial research area due to the rapid expansion of agriculture and stringent environmental protection acts. In this paper, the as-prepared CuO-TiO 2 hybrid nanocomposites were decorated on the glass carbon electrode as the nonenzymatic electrochemical nanosensor for the sensitive and selective detection of methyl parathion. The electrochemical behavior of the modified electrode was investigated by cyclic voltammetry, showing that the modified electrode can be used for methyl parathion detection. Differential pulse voltammetry was applied to evaluate methyl parathion detection ability under optimized experimental conditions, and found the modified electrode can detect methyl parathion sensitively in a wide dynamic detection range from 0 ppb to 2000 ppb with a lower limit of detection (LOD) of 1.21 ppb. In addition, other interfering materials have no any influences on the detection of methyl parathion. Furthermore, the modified electrode has also been used for methyl parathion detection in the actual ground water samples, and showed efficient sensing ability. The electrochemical sensor developed would have great potentiality for methyl parathion sensing and provide new insights into the detection of other organophosphorous pesticides in the ground water.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Chaofan Ma,Qun Yang,Huiyu Su,Huimin Yang,Xiaoxia Wang,Dawen Zeng
P-type semiconductors [copper oxide (CuO) and cuprous oxide (Cu2O)] have been widely researched as good gas sensing materials due to their unique oxygen adsorption properties. In this work, C-doped CuO/Cu2O hollow nano-octahedrons have been prepared by thermal decomposition of the Cu-based metal–organic framework ([Cu3(BTC)2]n). The CuO and Cu2O nanoparticles form nano-octahedron heterojunctions by a close packing mode. A large number of active heterojunction sites were exposed, which significantly increased the adsorbed oxygen (O2–) content. Meanwhile, doping C in the lattice of the heterojunction effectively reduces the band gap of CuO/Cu2O and promotes the chemical reaction of the target gas on the surface of the material. Density functional theory calculations indicate that the CuO/Cu2O heterojunction has strong adsorption ability for NO2. Electrochemical impedance spectroscopy further reveals that C-doped CuO/Cu2O hollow nano-octahedrons-40 min heterojunction has the best electron transport performance. The sensors have good gas sensing response (22.88–50 ppm) and selectivity to nitrogen dioxide (NO2) at room temperature (28 °C). In addition, the sensor has extremely low detection, which can detect parts per billion level NO2 (20.50% to 100 ppb). It is expected to provide a reference for the development of a room-temperature NO2 sensor.
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