ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Jitong Deng,Yanan Zhang,Hongjing Han,Yongjun Zhang,Haiying Wang,Xuzhong Gong,Yanguang Chen
The chemical looping conversion of CH4 has been one of the most promising technologies for achieving the “two-carbon” strategy. Fe2O3 oxygen carrier cannot maintain the excellent release performance of lattice oxygen at high temperature due to the sintering and carbon deposition. Therefore, quaternary La1–xSrxFe1–y CoyO3 perovskite was selected as the transfer support of oxygen ions. By using the MOF precursor method, ternary La0.8Sr0.2FeO3 was prepared via the introduction of metal Sr into the binary LaFeO3. The adsorption energy of CH4 on the La0.8Sr0.2FeO3 was the lowest (−0.054 eV), compared with separate Fe2O3 and LaFeO3, and the adsorption energy of free H at the adjacent Fe site was the lowest (1.650 eV). Furthermore, the La1–xSrxFe1–yCoyO3 perovskite was successfully synthesized by the doping of Co into the ternary La0.8Sr0.2FeO3. La0.8Sr0.2Fe0.8Co0.2O3 was chosen to composite Fe2O3 oxygen carrier. As m(Fe2O3):m(La0.8Sr0.2Fe0.8Co0.2O3) = 1:1, the lattice oxygen conversion rate was less than 47% and the selectivity of CO2 reached 99.5% through the synergistic effect of lattice oxygen and oxygen vacancies. Fe2O3–La0.8Sr0.2Fe0.8Co0.2O3 increased the lattice oxygen conversion by 17.6%, compared with Fe2O3–La0.8Sr0.2FeO3. After the CH4 chemical looping conversion cycles five times, Fe2O3–La0.8Sr0.2Fe0.8Co0.2O3 still had favorable structural stability and oxidation performance, and the lattice oxygen conversion rate still reached >95%.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2022
·
IF 2.719
Peng Yong,Sheng Wang,Xu Zhang,Haibo Pan,Shuifa Shen
Shape controlled preparation and doping are important means to improve the gas sensitivity of metal oxide semiconductor materials. In this work, pure and Co-doped In 2 O 3 porous hollow hexagonal cylinders were successfully prepared using metal–organic frameworks (MOFs) MIL-68(In) as self-sacrificial template. The size of the MIL-68(In) hexagonal cylinder is uniform, and the In 2 O 3 obtained after pyrolysis better inherits the shape of the MIL-68(In), but becomes hollow, and the cylinder surfaces are porous. The product has a large specific surface area (46.52 m 2 /g), and the doping of Co significantly increases the oxygen vacancy of the material. The Co-doped sample obtained by pyrolysis at 500℃ has excellent gas sensing performances to ethanol gas, its sensitivity to 100 ppm ethanol gas at 210 ℃ is 14.6, response/recovery time is 21 s and 107 s, and the sensing selectivity to ethanol is also good.
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
CHEMOSPHERE
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2022
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IF 8.943
Hanlin Wang,Haibo Liu,Xuehua Zou,Fuwei Sun,Luyao Wang,Jingchao Hu,Dong Chen,Meng Liu,Jianfei Shen,Tianhu Chen
In this work, the effect of Co substitution in the Fe 1-x S (CSP) on the activation of H 2 O 2 to degrade tetracycline (TC) is investigated. A series of CSP samples with different Co content are synthesized via a high-temperature sulfidation method and characterized by XRD , XPS , SEM, and electrochemical analysis . The result showed that low Co content (≤1%) promotes the catalytic activity of Fe 1-x S, while excessive Co (1%﹤x ≤ 3%) inhibits its catalytic activity. The investigation of Behnajady-Modirshahla-Ghanbery kinetic model (BMG) showed that the maximum initial degradation rate of TC over 1.0% CSP/H 2 O 2 was 1.6 times than that of in CSP/H 2 O 2 system. The Box-Behnken with Response Surface Methodology was employed to verify optimum condition for TC degradation. The quenching experiments and ESR determined that ·OH, ·O 2 − and 1 O 2 were involved in TC degradation with the treatment of 1.0% CSP/H 2 O 2 system. Electrochemical analysis, ·OH quantification, and metal ion concentrations measure reveal that Co substitution accelerates electron transfer efficiency and Fe 2+ regeneration. Furthermore, nine intermediates are identified and the possible degradation pathway of TC is proposed. The unique effect of Co provides novel insight and efficient strategies for improving the reactivity of iron sulfide.
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
ACS Applied Nano Materials
·
2022
·
IF 6.14
Luyao Wang,Zhe Bai,Xiangwen Zhang,Guozhu Li
Hydrodesulfurization (HDS) is an important technique that is widely adopted in the petroleum industry to remove harmful sulfur compounds for environmental protection. MoS2 is the most commonly employed HDS catalyst but tends to stack due to its high surface energy. Active MoS2 nanosheets are anticipated to be well supported for preventing aggregation and increasing accessibility. In the current study, two-dimensional Ti3C2 MXene is utilized as a novel support to controllably anchor MoS2 nanosheets for efficient HDS. The composite of Ti3C2-supported CoMoS2 (CoMoS2/Ti3C2) with a 3D interconnected network was successfully constructed by a facile, one-step hydrothermal method. Detailed characterizations showed that MoS2 nanosheets vertically grew in situ on and between the layers of Ti3C2 MXene. CoMoS2/Ti3C2 possesses a well-defined open structure with a larger specific surface area and a higher proportion of CoMoS active phase compared with unsupported CoMoS2. As catalyzed by CoMoS2/Ti3C2, the reaction rate constant was effectively increased to 2.8 times that on CoMoS2 for the HDS of dibenzothiophene. CoMoS2/Ti3C2 also showed good stability in a harsh high-temperature reaction environment.
研究领域:
材料科学
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催化化学
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能源化工
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2024
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IF 6.9
Dawei Lan,Huiwen Zhu,Jianwen Zhang,Fan Wang,Yueying Zheng,Zeyu Guo,Gang Yang,Mengxia Xu,Tao Wu
Metal-organic frameworks (MOFs) is a promising material that can be used in many fields, including environmental remediation. In this work, a novel adsorbent was successfully prepared by doping the Co element into the framework of UiO-66 with an in-situ oil bath synthesis. This modification ensured that the materials retained relatively good crystallinity. The Co-doping process had a major impact on the particle size and morphology of the original MOFs. The CoUiO-2 exhibited larger surface area and pore size than pristine UiO-66. Accordingly, the maximum adsorption amount of malachite green (MG) on CoUiO-2 (628.93 mg/g) was significantly larger compared with UiO-66 (343.64 mg/g), which was due to more active adsorption sites. In addition, the CoUiO-2 also showed a superior adsorption capacity on rhodamine B (RhB) (1106.22 mg/g). The adsorption process was well described by both the pseudo-second order and Langmuir models, indicating it was dominated by chemisorption and the adsorbent had a homogeneous surface area for adsorption. Therefore, the CoUiO-2 material could be a promising adsorbent for wastewater treatment . This work can provide an important insight into the modification of MOF materials and identify further opportunities to promote the adsorption performance in environmental remediation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Ning Zhang,Zhuhe Zhai,Yueru Yan,Xuejiao Feng,Shengqiang Chen,Yafei Zhao,Bing Zhang
Rationally designing heterostructured photocatalysts to expedite the separation/transfer of photoinduced electrons/holes is regarded as an exceptionally efficient and simple strategy for promoting the photocatalytic hydrogen production from water splitting. To this end, an effective photocatalyst (Co-MoS 2 /ZIS) was constructed via in-situ growth of two-dimensional (2D) ZnIn 2 S 4 (ZIS) nanosheets on 2D Co doped MoS 2 (Co-MoS 2 ) nanoplates to obtain 2D/2D heterostructure. The optimized 5 wt% 20-Co-MoS 2 /ZIS photocatalyst displays a remarkably higher photocatalytic water splitting performance with hydrogen generation rate of 2405.34 μmol g -1 h −1 than that of pure ZIS (419.69 μmol g -1 h −1 ). Additionally, it also demonstrates good stability and reusability with unconspicuous and insignificant decrease of activity after eight cycles and 24 h. The improved photocatalytic hydrogen production performance may be attributed to the extraordinary heterostructure of Co-MoS 2 /ZIS, the doping of Co in MoS 2 and the thick/flat surface of Co-MoS 2 , which provide large close contact interface and plentiful active sites, and prevent the aggregation of ZIS and Co-MoS 2 , thus shortening the transport distance, improving the light absorption and accelerating the separation/transfer of the photoinduced electrons/holes. This work offers a rational and feasible method for coupling 2D ZIS nanosheets with other 2D nanoplates for enhanced photocatalytic hydrogen generation from water splitting.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
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IF 5.5
Juanjuan Yang,Dandan Shao
CO2 to methanol is considered a promising method for CO2 conversion and utilization, yet achieving desirable selectivity remains a significant challenge. Herein, efficient CO2 hydrogenation to methanol is achieved by synthesizing Co0.7ZnO with abundant oxygen vacancies (Ov) through the incorporation of a portion of Co into nanoscale ZnO. By tuning the molar ratio of Co/(Co+Zn) in CoxZnO to increase the Ov content to 71%, CO2 adsorption and activation to form formate (COOH*) are enhanced, thereby reducing the CO selectivity. The efficiency of the hydrogenation of CO2 to methanol was optimized with Co0.7ZnO, which exhibited an impressive methanol formation rate of 2.1 mmol/(g h) and a selectivity of up to 96.7%. The unique structure of incorporating partial Co into nanoscale ZnO to increase the level of Ov not only reduces the level of CO selectivity but also inhibits methane formation, thereby contributing to the high methanol selectivity. This study presents an innovative strategic design through partial doping, which is essential for controlling the selectivity of target products in the CO2 hydrogenation.
研究领域:
化学工程
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材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 27
·10609-10617
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IF 8.262
Dewei Liang,Shouliang Wu,Jun Liu,Zhenfei Tian,Changhao Liang
Morphology control and impurity doping are two widely applied strategies to improve the electrochemical performance of nanomaterials. Herein, we report an environmentally friendly approach to obtain Co-doped Ni(OH)2 nanosheet networks using a laser-induced cobalt colloid as a doping precursor followed by an aging treatment in a hybrid medium of nickel ions. The shape and specific surface area of the doped Ni(OH)2 can be successfully adjusted by changing the concentration of sodium thiosulfate. Furthermore, a Co-doped Ni(OH)2 nanosheet network was further converted into Co-doped NiO with its pristine morphology retained via facile thermal decomposition in air. The structure and electrochemical performance of the as-prepared samples are investigated with scanning and transmission electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, Fourier transform infrared spectroscopy, the nitrogen adsorption–desorption isotherm technique, and electrochemical measurements. The Co-doped Ni(OH)2 electrode shows an ultrahigh specific capacitance of 1421 F g−1 at a current density of 6 A g−1, and a good retention level of 76% after 1000 cycles, in sharp contrast with only a 47% retention level of the pure Ni(OH)2 electrode at the same current density. In addition, the Co-doped NiO electrode exhibits a capacitance of 720 F g−1 at 6 A g−1 and 92% retention after 1000 cycles, which is also superior to the corresponding values of relevant pure NiO electrodes. The Co2+ partially substitutes for Ni2+ in the metal hydroxide and oxide, resulting in an increase of free holes in the valence band, and, therefore, enhancement of the p-type conductivity of Ni(OH)2 and NiO. Moreover, such novel mesoporous nanosheet network structures are also able to enlarge the electrode–electrolyte contact area and shorten the path length for ion transport. The synergetic effect of these two results is responsible for the observed ultrahigh pseudocapacitor performance.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Yinyin Zhang,Fangzhong Liu,Ting Song,Yong Pei,Xianyou Wang,Xiongwei Wu,Manjun Xiao,Qi Deng,Bei Long
The electrochemical performances of LiNi 0.5 Mn 1.5 O 4 (LNMO) materials are strongly correlated with the ratio of disordered to ordered phases. Nevertheless, there are few reports on the adjustment of ordered and disordered phase ratio. In this paper, the ratio of ordered to disordered phases in LNMO is successfully adjusted by using a quaternary molten salt, which is proven by XRD refinement, FT-IR, and XPS. Reductive quaternary molten salt and Co doping are favorable for Ni/Mn cation disorder, leading to the increased disordered phase. LNMO with an appropriate ratio of ordered to disordered phases can exhibit enhanced electronic/ionic transfer rate and structural stability, revealed by electrochemical tests and ex situ characterizations. Therefore, the optimized material delivers a reversible capacity of 121 mA h g −1 at 20 mA g −1 and a long cyclic life with 61 mA h g −1 at 1000 mA g −1 over 1200 cycles. The present work offers a new idea for achieving a regulated ratio of ordered to disordered phases in LNMO.
研究领域:
材料科学
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电化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Leyao Bi,Boyan Fu,Jiahui Lin,Junsheng Wen,Jiaxing Fu,Binglin Zou,Ningning Su,Chunjie Wang,Yue Wang
Acetylacetone gas is a flammable, explosive, and toxic volatile compound with a pungent odor that can contaminate the atmospheric environment and pose a risk to human health. Consequently, establishing effective detection methods for acetylacetone is imperative. In this study, Co-doped ZnO (ZOC) were synthesized via a hydrothermal method with varying Co concentrations from 0 to 15 %, and used for the detection of acetylacetone for the first time. The sample with an 8 % Co/Zn mass ratio (8-ZOC) exhibits optimal gas sensing performance for acetylacetone. At a working temperature of 260 °C, the response to 100 ppm acetylacetone reaches up to 557.25, with a rapid response time of 6 s. Compared to pure ZnO, the response of 8-ZOC is increased by 5.9 times, and both the recovery time and the optimum operating temperature are reduced by 154 s and 40 °C, respectively. When exposed to UV light, the response value of 8-ZOC further improves to 682.49. Moreover, the underlying mechanisms of the enhanced gas sensing properties are also explored in detail. This research provides essential insights for the development of acetylacetone gas sensors.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Ye Zhaochun,Yao JiaCheng,Zheng Wen,Yuan Wenhui,Guan Jianyu,Li Li,Xiao Hong
Octafluoropropane (C 3 F 8 ) is a kind of super greenhouse gas, and the low concentration of octafluoropropane makes it difficult to be adsorbed and removed. In this study, a series of Co-doped MOFs (Co x Cr-MIL-101) have been successfully synthesized using a hydrothermal method without the addition of strong acids such as HF. The structural properties of the prepared Co x Cr-MIL-101 are characterized using SEM, XRD, nitrogen adsorption desorption test, etc. The adsorption properties of C 3 F 8 are measured by single-component isothermal adsorption experiments and fixed bed adsorption breakthrough experiments. The adsorption mechanism was investigated via the adsorption theory models. The results show that the introduction of cobalt ions can effectively improve the adsorption capacity of MIL-101, among which the Co 0.2 Cr-MIL-101 exhibits the best adsorption performance. The C 3 F 8 equilibrium adsorption capacity reaches 0.077 mmol/g at 298 K and 180 Pa, which is 3.03 times that of the pristine MIL-101 and the dynamic adsorption capacity is 20.710 mmol/g (298 K, 1.2 L/min), which is 9.37 times that of the pristine MIL-101. Inspiringly, the IAST separation selectivity of C 3 F 8 /N 2 at 100 kPa is up to 146.7, which is 14.3 times that of the pristine MIL-101. More importantly, the co-modified adsorbent showed better thermal stability and cyclic stability. In addition, Co 0.2 Cr-MIL-101 fits the Freundlich isothermal adsorption model, and the adsorption mechanism analysis shows that the high adsorption capacity of Co 0.2 Cr-MIL-101 benefits from the unique pore structure and abundant active sites of the modified MOFs.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 8
·5041-5052
·
IF 3.553
Hu Leqi,Jia Fuchao,Wang Shuo,Shao Xingyan,Wang Xiaomei,Sun Yuping,Yin GuangChao,Zhou Tong,Rajan Ramachandran,Feng Zhenyu,Liu Bo
In the present study, the nano-composite of Co-doped g-C 3 N 4 and ZnO (Co–C 3 N 4 /ZnO) sensor was successfully prepared by using solid-phase precursor synthesis method. The crystalline phases were analyzed by X-ray diffraction (XRD), the microstructure of Co–C 3 N 4 /ZnO sensor was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the chemical bonding states were analyzed by X-ray photoelectron spectroscopy (XPS). The gas sensing performance of Co–C 3 N 4 /ZnO sensor was systematically studied and compared with other sensors at the operating temperature of 200–370 °C, and the highest response was observed at 370 °C. Interestingly, Co–C 3 N 4 /ZnO sensor exhibited better response to o-xylene, m-xylene and p-xylene compared with other BTEX gases tested in this study; especially about 11 times higher response was observed against p-xylene compared with pure ZnO sensor at 370 °C. In addition, this sensor showed good stability and repeatability even after 14 weeks with a response/recovery time of 2 s/2 s. The improved gas sensing performance of this sensor was attributed to the formation of more active sites and more number of active oxygen species on the surface of ZnO. Based on these results, it could be ideal to explore Co–C 3 N 4 /ZnO sensor for the rapid detection of BTEX gases, specifically for p-xylene, in the surrounding environment.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）