CHEMOSPHERE
·
2023
·
IF 8.8
Qingyi Zeng,Liu Yang,Qingyan Zhang,Tao Cai,Yumei Wang,Yuhan Cao,Junwen Lv,Zhu Xiong,Suqing Wu,Rena Oh
The utilization of bio-wastes, such as shaddock peels, is of great significance for sustainable development. Combined with the potential of peroxymonosulfate (PMS) based advanced oxidation process (AOP) in wastewater treatment , a highly efficient functional catalyst, derived from shaddock peels biochar (SPC) and embedded with CoO@Co nanoparticles , i.e. Co-SPC-x(y), was prepared using a facile impregnation-calcination method and used for refractory organics degradation with PMS. The decoration amount of Co and annealing temperature were optimized, and the effects of various reaction factors were investigated. The results indicated that the optimized sample of Co-SPC-10 (900) consisted of multilayer biochar with curly edges and highly dispersed CoO@Co nanoparticles in the range of 20–200 nm, which is in cubic metallic Co and CoO. Moreover, it also possessed a specific surface area of 248.6 m 2 /g, and exhibited excellent PMS activation ability with ∼100% chlortetracycline hydrochloride (CTC) removal ratio within only 12 min of operation. The Co-SPC-10 (900)/PMS system showed relatively high tolerance for HPO 4 2− , NO 3 − and SO 4 2− , while the Cl − and HA had considerable effects on it. Mechanism exploration results revealed that both radical and non-radical pathways existed in the Co-SPC-10 (900)/PMS system, in which the multilayered biochar functioned as an electron transfer carrier to facilitate the continuous cycle of Co 2+ /Co 3+ in the CoO@Co nanoparticles by reacting with the absorbed CTC and PMS, resulting in the production of •OH, SO 4 •− , O 2 •− and 1 O 2 . Additionally, the Co-SPC-10 (900) also showed good stability and catalytic oxidation performance for various refractory organics.
研究领域:
环境科学
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材料科学
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污水处理
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DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yao Liang,Hongzhong Cai,Jiushuai Deng,Yiqi Cui
The regulation of the electrocatalytic activity of an iridium surface using a plasma activation treatment process has been studied experimentally and using first-principles calculations. The microstructures and catalytic properties were investigated using scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, cyclic voltammetry and CO-stripping voltammograms. The results show that the plasma activation treatment process can promote the surface energy of iridium particles, thereby increasing their surface activity as a catalyst. Furthermore, the current density of Ir/C-Plasma is 1.46 times higher than that of Ir/C, indicating that the electrocatalytic activity is significantly increased upon increasing the number of surface-active sites. More importantly, the mechanism of the surface activity sites that improves the catalyst performance of the iridium surface was illustrated using first-principle calculations. We also find that CH3OH molecules form chemical bonds with the dangling bonds localized on the iridium atoms around the vacancies and that these sites have the lowest adsorption energy (–0.578 eV). Meanwhile, the TS results indicate that the dissociation of CH 3 OH on a non-vacancy surface was more difficult than on the one-vacancy surface. In addition, the charge transfer further confirms that the vacancies on the iridium surface can provide a large number of active sites for chemical adsorption/desorption, which can promote CO anti-poisoning processes. This study not only reveals the CH 3 OH adsorption/desorption reaction mechanism of Ir/C-Plasma, but also provides effective guidance toward improving the catalyst performance of noble metal catalysts.
研究领域:
材料科学
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电化学
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理论计算
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DOI
高影响因子
ACS Applied Nano Materials
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2018
·
IF 0
Jing Qiao,Dongmei Xu,Longfei Lv,Xue Zhang,Fenglong Wang,Wei Liu,Jiurong Liu
In this work, hollow ZnO/Co hybrid nanotubes are prepared by electrospinning followed by calcination and hydrogen reduction process for electromagnetic wave absorption. The texture and electromagnetic wave absorption performance of ZnO/Co hybrid nanotubes with different Co contents are thoroughly investigated. Among the studied hybrid nanotubes, ZnO/Co hybrid nanotubes with the same molar concentrations exhibit superb electromagnetic wave absorbing property. The maximum reflection loss reaches −68.4 dB at 11.4 GHz with a matching thickness of 3.0 mm and the maximum effective absorption (reflection loss ≤ −10 dB) bandwidth is up to 5.9 GHz (9.5–15.4 GHz) with a matching thickness of 2.6 mm. The superior property could be attributed to the favored impedance matching performance and various loss pathways including natural resonance, interfacial polarizations, dipole polarization, and conductive loss. The unique three-dimensional network structure formed by nanotubes further contributes to the loss performance. The hollow ZnO/Co hybrid nanotubes can be utilized as an ideal candidate for lightweight and high-efficiency electromagnetic wave absorption materials.
研究领域:
材料科学
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物理学
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DOI
APPLIED CATALYSIS A-GENERAL
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2021
·
IF 5.706
Chenglin Feng,Xiaolong Liu,Tingyu Zhu,Yutao Hu,Mengkui Tian
Anatase TiO 2 loaded with 0.1wt.% Pt catalyst (0.1Pt/TiO 2 -A) was prepared via the impregnation method, and its CO catalytic oxidation activity was investigated. Noteworthy, introduction of H 2 O into the reaction atmosphere apparently facilitated the catalytic oxidation of CO. Besides, introduction of SO 2 inhibited the catalytic oxidation of CO. In presence of H 2 O and SO 2 , 0.1Pt/TiO 2 -A showed outstanding catalytic stability, and X-ray photoelectron spectroscopy (XPS) and thermogravimetric (TG) characterizations suggested that the amount of sulfate species deposited on the 0.1Pt/TiO 2 -A treated at 230 °C did not increase with time extension, which might be an important reason for the high sulfur resistance of 0.1Pt/TiO 2 -A. XPS results also demonstrated that the dissociation of H 2 O led to considerably increase of hydroxyl groups over the catalyst surface. H 2 18 O isotope-labeling experiments unambiguously showed that C 16 O 18 O was the main product accounting for 88.9%, revealing that the other oxygen atom in the product CO 2 was mostly from H 2 O. Consequently, based on previous researches and our experimental results, the mechanism of H 2 O promoting CO oxidation on 0.1Pt/TiO 2 -A catalyst was proposed.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
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2016
·Vol. 67
·期 10
·1034-1041
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IF 1.45
L.T. Shi,J. Hu,L. Fang,F. Wu,X. L. Liao,F. M. Meng
Ternary Ni-Co-P/TiN (20 nm) nanocomposite coatings with Co content in the range of 0–23 wt% were successfully co-deposited on Al alloys by electroless plating. The morphology, composition, microstructure, micro-hardness, wear behavior, and corrosion properties of the coatings were tested using SEM, EDS, XRD, Vickers hardness, ball-on-disc wear tester, and electrochemical workstation, respectively. The effect of Co content on the tribological and corrosion properties of Ni-Co-P/TiN coatings was studied. It is found that all the coatings have a compact and rough granular structure with sub-micro globules non-uniformly distributed on the surface. The grain size and the content of Ni and P decrease, but the micro-hardness, adhesion force, friction coefficient, and corrosion resistance correspondingly enhance with the increase of Co content in Ni-Co-P/TiN coatings. The improved corrosion resistance of Ni-Co-P/TiN coating is due to the passivation behavior and small grain caused by the introduction of Co. Based on the excellent properties on the wear and corrosion resistance, ternary Ni-Co23-P/TiN coating with high Co content, may be applied as an optimum protective coating for Al alloys.
研究领域:
材料科学
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电化学
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表面工程
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DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-11
·
IF 4.011
Li Junchao,Li Xuhua,Han Jindong,Meng Fansheng,Jiang Jinyuan,Li Jiao,Xu Chunlian,Li Yun
Mesoporous bimetallic Fe/Co was prepared as a Fenton-like catalyst to degrade the tetracycline hydrochlorides (TC). The nanocasting strategy with KIT-6 as a hard template was carried out to synthesize the mesoporous bimetallic catalyst. The mesoporous bimetallic Fe/Co catalyst was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption-desorption isotherms, and Brunauer-Emmett-Teller (BET) method. The results showed that the catalyst has significant nanofeatures; the surface area, pore size, and particle size were 113.8 m 2 g −1 , 4 nm, and 10 nm, respectively. In addition, the effects of the operating parameters, such as the iron-to-cobalt ratio, pH, H 2 O 2 , and initial TC concentrations on its catalytic performance were investigated. The best operating parameters were as follows: iron-to-cobalt ratio = 2:1 to 1:1, pH = 5–9, H 2 O 2 : 30 mmol, initial TC less than 30 mg/L. Furthermore, the mesoporous bimetallic Fe/Co showed a good performance for degrading TC, achieving a removal rate of 86% of TC after 3 h under the reaction conditions of H 2 O 2 = 30 mmol, mesoporous bimetallic Fe/Co = 0.6 g/L, TC = 30 mg/L, pH = 7.0, and temperature = 25.5 °C. The mesoporous bimetallic Fe/Co catalyst shows good stability and reusability. This work demonstrated that mesoporous bimetallic Fe/Co has excellent catalytic efficiency, smaller amounts of leached ions, and wider pH range, which enhance its potential applications.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Shuaipeng Wang,Li Xu,Weixin Lu
Non-noble metal catalysts with high-performance are intensively exploited toward water electrolysis. Herein, we fabricate a novel Ni 3 S 2 @Co(OH) 2 heterostructure with a tentative method combining hydrothermal method with electrodeposition, in which the Ni 3 S 2 nanosheets are evenly integrated with Co(OH) 2 nanoparticles. Electrochemical tests reveal preeminent catalytic activities and durability on this heterostructure for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). It presents high catalytic activities of 110 and 257 mV at 10 mA cm −2 for HER and OER, respectively, in 1.0 M KOH solution. Moreover this bifunctional electrode requires only 1.61 V to reach 10 mA cm −2 and shows excellent durability when assembled as an electrolyzer, superior than that of Pt-C||IrO 2 . The promoted activities are benefited from the interfacial cooperation and synergistic effect between Ni 3 S 2 and Co(OH) 2 , because of which the charge-transfer ability is enhanced and surface reactivity is of furtherance. This work is of very profound significance on electrocatalysts for water splitting, specific performances: (1) This heterostructure is synthesized based on interface engineering. (2) The promoted performance is due to the synergistic effect of two onefold-components. (3) The catalysis activities for HER and OER can synchronously reach ideal states when it is used as bifunctional catalyst.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Weiwei Guo,Yuting Shuai,Xuecheng Liu,Jie Zhang,Jiang Wang,Khaled H. Mahmoud,Zeinhom M. El-Bahy,N.M. Mubarak
N-butanol, a poisonous and flammable liquid, has great threat to human life and property security, which is of importance to monitor n-butanol in the environment. In this paper, the pure and Co-doped BiVO 4 polyhedrons are successfully synthesized by hydrothermal method . A series of characterizations, such as XRD , XPS, SEM, UV, and EIS, etc., are used to analyze the crystal structure, morphology, element compositions , optical and electrochemical properties of the as-prepared samples. The optimal sample (3Co-BiVO 4 ) exhibits high gas response (51.65) toward 100 ppm n-butanol, which is around four times higher than that of pure BiVO 4 at 300 °C. In addition, the 3Co-BiVO 4 also has fast response-recovery time, good humidity resistance, favorable selectivity to n-butanol, etc. Based on the above characterizations and gas sensing test results, the enhanced gas sensing mechanism for 3Co-BiVO 4 is proposed. This work provides a feasible strategy to fabricate BiVO 4 polyhedron by doping Co to greatly enhance the gas sensing properties for n-butanol.
研究领域:
材料科学
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环境监测
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Bo Zhang,Jing Bai,Yan Zhang,Changhui Zhou,Pengbo Wang,Lina Zha,Jinhua Li,Abdolreza Simchi,Baoxue Zhou
H2S and CO2 are the main impurities in raw natural gas, which needs to be purified before use. However, the comprehensive utilization of H2S and CO2 has been ignored. Herein, we proposed a fully resource-based method to convert toxic gas H2S and greenhouse gas CO2 synchronously into CO and elemental S by using a novel electrochemical reactor. The special designs include that, in the anodic chamber, H2S was oxidized rapidly to S based on the I–/I3– cyclic redox system to avoid anode passivation. On the other hand, in the cathodic chamber, CO2 was rapidly and selectively reduced to CO based on a porous carbon gas diffusion electrode (GDE) modified with polytetrafluoroethylene and cobalt phthalocyanine (CoPc). A high Faraday efficiency (>95%) toward CO was achieved due to the enhanced mass transfer of CO2 on the GDE and the presence of the selective CoPc catalyst. The maximum energy efficiency of the system was more than 72.41% with a current density of over 50 mA/cm2, which was 12.5 times higher than what was previously reported on the H2S treatment system. The yields of S and CO were 24.94 mg·cm–2·h–1 and 19.93 mL·cm–2·h–1, respectively. A model analysis determined that the operation cost of the synchronous utilization of H2S and CO2 method was slightly lower than that of the single utilization of H2S in the existing natural gas purification technology. Overall, this paper provides efficient and simultaneous conversion of H2S and CO2 into S and CO.
研究领域:
环境科学
·
能源化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Yang Wang,Lei Zhang
In order to eliminate multiple coexisting pollutants in environmental wastewater, a magnetic three-dimensional hierarchical porous flower-like N, Co-doped graphitic carbon nano-polyhedra decorated NiCo-layered double oxides (N-Co@C/NiCo-LDOs) adsorption material was synthesized, which consisted of two-dimensional LDOs nanosheets with functionalized surfaces (N, Co-doped graphitic carbon loaded on both sides of NiCo-LDOs nanosheets). The adsorption properties of N-Co@C/NiCo-LDOs for five types of typical pollutants (cationic dyes: rhodamine b, methylene blue ; pesticides: ethofenprox, bifenthrin ; anionic dyes: methyl orange, congo red; inorganic cations : Cr 2+ , Cd 2+ , Pb 2+ , Zn 2+ , inorganic anions : Cr 2 O 7 2− , AsO 3 3− ) were investigated systematically in single and coexisting systems. Combined with the results of FTIR and zeta potential , the adsorption mechanism was discussed. By virtue of its hierarchical porous architecture and the combined effect of functionalized surfaces and LODs supporter, the as-prepared N-Co@C/NiCo-LDOs demonstrates excellent adsorption performance towards five types of typical pollutants with fast adsorption rate, high adsorption capacity and good co-adsorption performance. More importantly, the N-Co@C/NiCo-LDOs showed satisfactory removal efficiency, stability and reusability in model wastewater. The broad-spectrum, rapid, easily separable, and reusable adsorption properties make N-Co@C/NiCo-LDOs promising for highly efficient wastewater treatments . This work also provides a feasible way for the preparation of adsorption materials for the treatment of complex wastewater systems.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Weiwei Zhang,Shengsong Du,Baosong Li,Tianyong Mei,Yicheng Miao,Hongqiang Chu,Jiajia Wang
In the present work, TiN nanoparticle reinforced Ni-Co alloy coatings have been synthesized by pulse current electrodeposition under the assistance of magnetic and ultrasonic agitation. Various analytical techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), atomic force microscope (AFM), X-ray photoelectron spectroscopy (XPS) were used to explore the effects of current densities and agitation modes on the coating composition, morphology and structure of the electrodeposits. The corrosion resistance of the composite coating was examined by electrochemical impedance spectroscopy (EIS) in 3.5 wt% NaCl solution. The electrodeposits prepared under magnetic stirring exhibit nodular-protrusion morphology. The ultrasonic-assisted electrodeposited Ni-Co/TiN coatings are flatter, finer, and denser compared to that of magnetic stirring. The agitation mode affects the Co and TiN content in the composite coatings. The preferred orientation was (111) texture, which was gradually changed to (200) plane as the current density increased. The crystallite size was 14–17 nm, 11–14 nm for the magnetic and ultrasonic-assisted electrodeposited Ni-Co/TiN coatings, respectively. The roughness of the samples prepared under ultrasonic agitation was lower than that of magnetic stirring. EIS measurements show that the composite coating prepared at 6 A dm −2 under ultrasonic assistance exhibits the best corrosion resistance with maximum R ct during the whole immersion period. The ultrasonic-assisted electrodeposited Ni-Co/TiN coating has a denser structure and better corrosion resistance than that prepared under mechanical stirring.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 150
·期 1
·178-184
·
IF 2.372
Li Zhi-Xin,Wei Xian-Yong,Yang Zheng,Zhang Min,Meng Xing-Long,Niu Shuo,Zhang Di,Zong Zhi-Min
Abstract Highly selective hydrogenation of furfural to furan-2-ylmethanol (FM) in isopropanol was achieved over a novel magnetic Cu–Co/C derived from zeolitic imidazolate frameworks prepared by galvanic replacement reaction. Furfural conversion and FM selectivity (FMS) are 100% and 97.2%, respectively, at 200 °C. FMS was held around 95% after 5-times recycle of the Cu–Co/C. In addition, cinnamaldehyde was completely converted with 96.8% of phenylpropanol selectivity over the Cu–Co/C at 150 °C. Graphic Abstract
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）