RSC Advances
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2024
·Vol. 14
·期 49
·36181-36192
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IF 3.9
Bo Zhang,Chaoqi Li,Shasha Liu,Lixuan Zhuang,Weiqi Zhang,Limei Huang,Zhenzhen Jia,Dongdong Chen,Xiang Li
A CaMnO3/g-C3N4 heterostructure, demonstrating promising photocatalytic performance for tetracycline (TC), was successfully synthesized using a straightforward calcination approach in this study. A series of characterization methods were employed to assess the physicochemical properties and visible-light responsiveness of the synthesized photocatalysts. The photocatalytic degradation rates of TC for the three prepared samples were evaluated. The results indicate that the CaMnO3/g-C3N4 composite exhibits the highest photocatalytic activity under visible-light irradiation, surpassing that of the individual components. Specifically, the degradation rate of CaMnO3/g-C3N4 is 0.031 min−1, which is 2.07 and 2.82 times greater than that of the pristine g-C3N4 and CaMnO3, respectively. Our findings highlight the significant potential of eco-friendly perovskites in developing visible-light-activated g-C3N4-based heterostructures for practical photocatalytic applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2024
·
IF 5.2
Xin Xu,Bolin Xia,Amirreza Gholivand,Xiaoyu Zhang,Yunpeng Zhang,Linhui Liu,Daiqi Ye,Peirong Chen
Selective dissolution is highly promising for tailoring the structures and functions of metal oxides toward various applications. Here, we demonstrate a successful fabrication of porous γ-MnO 2 by selectively dissolving Ca in a CaMnO 3 perovskite (CMO) via dilute HNO 3 treatment. The perovskite-derived γ-MnO 2 (denoted as CMO-72 h) outperformed drastically the pristine CaMnO 3 and a commercial γ-MnO 2 in the catalytic oxidation of NH 3 and NO, two representative gaseous pollutants in the atmosphere. Physicochemical characterization by X-ray photoelectron spectroscopy and temperature-programmed techniques (including H 2 -TPR, O 2 -TPD and NH 3 -TPD) suggests that the excellent catalytic performance of CMO-72 h is associated with its low–temperature reducibility and abundant surface–active oxygen species. Specifically, acid treatment led to the oxidation of Mn 3+ to Mn 4+ on the surface, increasing significantly the Mn 4+ /Mn 3+ ratio from 0.76 (for CMO) to 1.45 (for CMO-72 h) and, meanwhile, generating additional surface oxygen vacancies . As a result, O 2 molecules can be easily adsorbed and activated on the CMO-72 h, leading to improved performance in NH 3 and NO oxidation. This study may offer new opportunities in the synthesis of high-performance Mn oxide catalysts for environmental applications.
研究领域:
环境科学
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材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Ying Wang,Xinyue Cao,Xiaoyan Li,Liang Chen,Meiqi Chang,Yu Chen,Bingcang Huang
Catalytic nanoenzyme-mediated therapy with reactive oxygen species generation feature and tumor microenvironment regulation characteristic has demonstrated high therapeutic efficacy in oncological field, whereas its low enzyme-mimicking reaction efficacy typically results in dissatisfied therapeutic effect and outcome. Herein, an ultrasensitive CaMnO 3 (CMO) nanoenzyme has been rationally designed and engineered for enzyodynamic-calcium overload synergistic tumor therapy. CMO nanoenzyme with oxidase (OXD)-, peroxidase (POD)- and glutathione peroxidase (GPx)-mimic activities is responsible for the generation of reactive oxygen species, the consumption of intra-tumor glutathione and mitochondrial damage. For the evaluation of OXD and POD-mimicking activities, CMO with ultra low concentration (1 μg ml −1 ) can rapidly catalyze the color reaction of 3,3′,5,5′-tetramethylbenzidine (TMB) hydrochloride and reach the reaction termination in a very short time (1 s). Moreover, the release and overload of Ca 2+ strengthen the tumor cell death. Exogenous ultrasound stimulation further amplifies the enzyodynamic-Ca 2+ overload synergistic tumor-therapeutic efficacy. In vitro and in vivo results affirm the transcendent antineoplastic outcomes of CMO. Meanwhile, the existence of Mn 2+ endows nanoenzyme with T 1 -weighted MR imaging capacity. This work provides new strategies for efficient enzyme-mimicking activity and tumor synergistic treatment based on new perspectives on the engineering of multifunctional therapeutic nanomedicine.
研究领域:
纳米技术
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生物医学工程
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癌症治疗
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Tian Wang,Xufang Qian,Dongting Yue,Xuan Yan,Hiromi Yamashita,Yixin Zhao
Perovskite oxides ABO 3 with unique structure showed promising performance on persulfates activation. Previous research works mainly focused on Co-based or rare earth metal (La, Sr)-based perovskite oxides for peroxymonosulfate (PMS) activation. Here, we firstly studied perovskite CaMnO 3 metal oxide composed with the low cost and eco-friendly Ca and Mn elements for PDS activation. Perovskite CaMnO 3 metal oxide achieve the superior catalytic activity for reactive oxygen species generation than the regular Mn oxides (β-MnO 2 and Mn 2 O 3 ) and other types Ca x Mn y O z (spinel-type CaMn 2 O 4 and Ca 2 MnO 4 ) solid solution due to the tolerance of Mn multivalence and defects in the perovskite structure and the excellent Mn 3+ /Mn 4+ redox capacity in CaMnO 3 . The CaMnO 3 /PDS system could be applied at a wide pH range from 4 to 12, and exhibited better performance in basic conditions. Different active species including SO 4 − , OH reactive radicals and singlet oxygen 1 O 2 were found and responsible for effective pollutants degradation. Our study shows eco-friendly perovskites possess great potential in the refractory organic pollutants removal by catalytic activation of PDS.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
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2025
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IF 5.5
Ruiqing Zhang,Guanyu Li,Shiyi Chen,Wenguo Xiang
The successful commercialization of concentrated solar power (CSP) plants necessitates the development of efficient energy storage systems to ensure the on-demand power generation during solar transients. In recent years, the redox cycling of doped CaMnO3−δ has emerged as a promising approach for thermochemical energy storage (TCES) in CSP applications. This study aims to enhance the thermochemical energy storage capability of CaMnO3−δ by co-doping with Sr and Co at the A- and B-sites, respectively, forming (SrxCa1–x)(CoxMn1–x)O3–δ. Two doping levels (x = 0.05 and 0.10) were investigated. XRD and SEM–EDS analyses confirmed that Sr and Co were homogeneously incorporated into the perovskite lattice, yielding porous microstructures in both compositions. Notably, evaluation of the thermochemical energy storage (TCES) densities of these codoped perovskites under diverse thermal energy storage conditions revealed that although the two materials exhibited different heat storage processes, comparable TCES densities were ultimately achieved. In particular, under favorable thermochemical energy storage conditions (1100 °C, pO2 = 10–5 atm), the thermochemical energy storage densities of Sr0.05Ca0.95Co0.05Mn0.95O3–δ and Sr0.10Ca0.90Co0.10Mn0.90O3–δ achieved 459 kJ/kgABO3 and 470 kJ/kgABO3, respectively. However, in the subsequent redox cycle tests, Sr0.10Ca0.90Co0.10Mn0.90O3–δ demonstrated a stronger reoxidation capability compared to Sr0.05Ca0.95Co0.05Mn0.95O3–δ. Compared to the undoped material, both co-doped samples exhibited significant improvements in the TCES density and thermal stability. Moreover, the isothermal redox reaction rate measurements and the analysis revealed the rapid redox reaction rate in both materials, providing valuable insights for the development of advanced perovskite-based thermochemical energy storage systems.
研究领域:
材料科学
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能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2025
·Vol. 23
·期 1
·e70126
·
IF 2.3
Shuhui Chen,Qinxing Xie
Ca 1- x Y x MnO 3 and Ca 1- x Y x Mn 1- y Nb y O 3 (0 ≤ x , y ≤ 0.07) thermoelectric ceramics were fabricated via microwave-assisted calcination followed by conventional sintering. The effects of substituting Ca with Y and Mn with Nb on the microstructure and power factor ( PF ) were systematically investigated. The results indicate that the crystal structure of CaMnO 3 remains unchanged upon doping. Electrical conductivity increases, while the absolute value of the Seebeck coefficient decreases with increasing dopant concentration in both series of compounds. Consequently, the PF for Ca 1- x Y x MnO 3 increases continuously within the range of doping amount (0 ≤ x ≤ 0.07), whereas that of Ca 1- x Y x Mn 1- y Nb y O 3 initially increases with x = y ≤ 0.02, and then decreases for 0.02 < x = y ≤ 0.06. In addition, the PF increases for all samples as the temperature increases. The maximum PF achieved are 127 µW m −1 K −2 for Ca 1- x Y x MnO 3 ( x = 0.07), and 154 µW m −1 K −2 for Ca 1- x Y x Mn 1- y Nb y O 3 ( x = y = 0.02). These results demonstrate that the co-doping of CaMnO 3 with Y/Nb is more effective in improving the electronic transport characteristics than single Y-doping.
研究领域:
材料科学
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热电学
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陶瓷
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固态化学
✓ 已验证
产品关联
DOI
高影响因子
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