ChemCatChem
·
2022
·Vol. 14
·期 21
·e202200762
·
IF 5.497
Mingyue Liao,Yingying Chen,Minmin Chen,Kang Hui Lim,Ziwei Li,Hong Wu,Xiong He,Qiao Zhou,Sibudjing Kawi
Graphical Reforming of methane : A series of CeO 2 nanorod@Ni phyllosilicate (CeO 2 @NiPhy) catalysts with good sintering resistance of both Ni and CeO 2 were designed for CO 2 reforming of methane (DRM) reaction. With the NiPhy shell thickness of 9 nm, CeO 2 @NiPhy-9 shows stable performance for DRM. In-situ diffuse reflectance infrared Fourier transform spectra result demonstrates that DRM reaction takes place with a bi-functional mechanism on CeO 2 @NiPhy. Preventing the sintering of nano-catalyst is crucial to maintain their performance especially for high-temperature reactions such as CO 2 reforming of methane (DRM) reaction. In this paper, we design CeO 2 nanorod@Ni phyllosilicate (CeO 2 @NiPhy) catalysts with different NiPhy shell thickness to simultaneously preserve the morphology of CeO 2 nanorod and prevent the sintering of Ni. Compared with Ni/CeO 2 supported catalyst, CeO 2 @NiPhy core-shell catalyst with a shell thickness of 9 nm exhibits much better performance for DRM with stable CH 4 and CO 2 conversions of 75 % and 80 % respectively and lower carbon deposition due to high Ni sintering resistance and higher thermal stability of CeO 2 during calcination and DRM reaction thereby higher oxygen vacancies concentration. In-situ diffuse reflectance infrared Fourier transform spectra result demonstrates that DRM reaction takes place with a bi-functional mechanism on CeO 2 @NiPhy. This design strategy can be applied to prepare other nano-catalysts with high sintering resistance of both active metal and catalyst support for high-temperature applications.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Sheng Wu,Renlu Han,Yuyan Yan,Wei Chen,Wenqing Gao,Yafei Hou,Keqi Tang
Recently, catalytic therapy on the basis of Fenton reaction represents a very promising paradigm for potential cancer therapy, which has inspired great research interest and got fast progress. Nevertheless, it remains challenging to fabricate nanocatalytic systems that can precisely perform catalytic activity in tumor tissues without causing toxicity to adjacent normal tissues. Herein, we designed and fabricated a porous CeO 2 nanorods that can selectively perform therapeutic activity in the weakly acidic tumor microenvironment via converting H 2 O 2 into •OH to kill cancer cells, meanwhile, the normal tissues are protected by decomposing H 2 O 2 into O 2 in the physiological environment. Specifically, benefiting from the porous structure, such CeO 2 nanorods could be loaded with Indocyanine green (ICG) that could both contribute itself to generate singlet oxygen ( 1 O 2 ) and convert near-infrared (NIR) light to hyperthermia. Once exposed to NIR light, on the one hand, the catalytic activity of CeO 2 was significantly enhanced by photothermal effect of ICG for highly efficient tumor catalytic therapy; on the other hand, the generated hyperthermia and 1 O 2 by ICG can further synergistically enhance the therapy efficiency via directing killing cancer cells. The current study provides a proof-of-concept demonstration of tumor-specific therapy with minimal non-targeted toxicity.
研究领域:
癌症治疗
·
纳米技术
·
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Yongjin Ma,Yuan Bian,Yi Liu,Anquan Zhu,Hong Wu,Hao Cui,Dewei Chu,Jun Pan
Photocatalytic hydrogen evolution from water splitting is a promising approach in energy conversion and storage. Here, the 0D/1D CdS quantum dots (QDs)/CeO2 nanorods heterojunction was designed and fabricated by a facile two-step method. The optimum photocatalytic H2 evolution activity for CeO2-based composites with 3 at. % CdS QDs (101.12 μ mol h–1 g–1) was 45 times as high as that of pure CeO2 nanorods (2.25 μ mol h–1 g–1) under light irradiation. Meanwhile, the photocurrent response intensity increased 17.75 times higher than pure CeO2 nanorods. Furthermore, the 0D/1D CdS QDs/CeO2 heterojunctions exhibited enhanced photocatalytic stability for long lifetime (60 h). The reasons that dramatically enhanced photocatalytic performance could be the improved light harvesting, enhanced photoresponse and stronger electronic conductivity while the CdS QDs was loaded in CeO2 nanorods to form the 0D/1D heterojunctions CdS QDs/CeO2 nanocomposites. What’s more, the remarkably increased photocatalytic performance of CdS QDs/CeO2 composites was mainly attributed to the Z-scheme between CdS QDs and CeO2 nanorods, which was confirmed by the PL (photoluminescence) method. Therefore, the proposed system is highly promising for large scale photocatalytic hydrogen evolution.
研究领域:
材料科学
·
纳米技术
·
可再生能源
·
催化
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 27
·70731-70741
·
IF 5.8
Lin Ruixi,Li Jiarong,Jing Xuequan,Guo Meina,Ren Guoqing,Qin Haonan,Yao Zhangwei,Wan Yinhua,Song Weijie,Zeng Huifeng,Yang Feifei,Zhao Da,Hu Kang
Adsorption of vanadium from wastewater defends the environment from toxic ions and contributes to recover the valuable metal. However, it is still challenging for the separation of vanadium (V 5+ ) and chromium (Cr 6+ ) because of their similar properties. Herein, a kind of CeO 2 nanorod containing oxygen vacancies is facilely synthesized which displays ultra-high selectivity of V 5+ against various competitive ions (i.e., Fe, Mn, Cr, Ni, Cu, Zn, Ga, Cd, Ba, Pb, Mg, Be, and Co). Moreover, a large separation factor ( SF V/Cr ) of 114,169.14 for the selectivity of V 5+ is achieved at the Cr 6+ /V 5+ ratio of 80 with the trace amount of V 5+ (~ 1 mg/L). The results show that the process of V 5+ uptake is the monolayer homogeneous adsorption and is controlled by external and intraparticle diffusions. In addition, it also shows that V 5+ is reduced to V 3+ and V 4+ and then formation of V–O complexation. This work offers a novel CeO 2 nanorod material for efficient separation of V 5+ and Cr 6+ and also clarifies the mechanism of the V 5+ adsorption on the CeO 2 surface.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Kirill A. Alferov,Zhongwei Fu,Shuxian Ye,Dongmei Han,Shuanjin Wang,Min Xiao,Yuezhong Meng
A new one-pot synthesis method of dimethyl hexane-1,6-diyldicarbamate (HDC), a potential intermediate compound in the synthesis of polyurethanes, from CO2, methanol, and 1,6-hexanediamine (HDA) is disclosed. The starting materials are renewable, stable, easily available, and cheap. The process was implemented in 1-methyl-2-pyrrolidinone (NMP) solvent over CeO2 catalysts. Three different CeO2 catalysts (commercial nanospheres, CeO2(c) obtained by direct calcination of (NH4)2Ce(NO3)6, and CeO2 nanorods) were tested in this reaction and their micromorphology and physical–chemical properties were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and N2 adsorption. CeO2 nanorods proved to be the most active catalytic material. The influence of different parameters on reaction outcome was studied. The yield of HDC was about 80% under optimized reaction conditions. Experiments for better understanding of reaction mechanism were also performed.
研究领域:
化学工程
·
催化
·
材料科学
·
有机化学
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Bio Materials
·
2020
·
IF 0
Hao Liu,YanLei He,Ning Li,Zhenxue Liu,Xianxi Zhang,Xiao Zhang,Qingyun Liu
N,N′-Dicarboxy methyl perylene diimide-coated CeO2 nanorods (PDI/CeO2 NR) were synthesized via an ultrasonic-assisted method. PDI/CeO2 exhibits the superb mimic peroxidase functions confirmed by the catalyzed oxidation of TMB by hydrogen peroxide in less than 60 s along with color transformation from colorless to blue. The catalytic mechanism was confirmed to be an electronic transfer mechanism by fluorescence experiment. Thus, a visual colorimetric sensor was constructed for hydrogen peroxide detection with a low detection limit (LOD = 2.23 μM). Comparing the inhibition effects of l-cysteine (Cys), ascorbic acid (AA) and glutathione (GSH) on the catalytic oxidation of TMB, it can be found that they possessed different types of inhibition on the oxidation of TMB by H2O2 using PDI/CeO2, and AA has better antioxidant effect, followed by Cys and GSH. On the basis of the excellent antioxidant effect of AA, a low-cost colorimetric sensor was also used to detect AA, and a lower LOD value (0.68 μM) was obtained in the linear range of 5.0–30 μM.
研究领域:
材料科学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
International Journal of Nanomedicine
·
2023
·
IF 8
Ying Zhang,Xiaowen Wu,Chenxi Hou,Kun Shang,Kui Yang,Zhimin Tian,Zhichao Pei,Yongquan Qu,Yuxin Pei
Objective The aim was to produce the first report of assembling degradable stimuli-responsive dithio-polydopamine coating with a cancer target unit for synergistic and targeted drug delivery.Methods A multifunctional drug delivery system was constructed by coating a dual-responsive dithio-polydopamine (PDS) on porous CeO2 nanorods and subsequent conjugation of lactose derivative, where the PDS was formed by self-polymerization of dithio-dopamine (DOPASS).Results The multifunctional drug delivery system displayed excellent cancer targeted ability resulting from the conjugation of lactose derivative, which could specifically recognize the overexpressed asialoglycoprotein receptors on the surface of HepG2 cells. It also showed a dual-responsive property of glutathione and pH, achieving controllable drug release from the cleavage of disulfide bond and subsequent degradation of PDS in cancer cells. Moreover, the degradation of PDS led to the exposure of CeO2 nanorods, which has a synergistic anticancer effect due to its cytotoxicity to cancer cells.Conclusion This work presents a good example of a rational design towards synergistic and targeted DDS for cancer chemotherapies.
研究领域:
纳米技术
·
药学
·
癌症研究
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2018
·
IF 0
Zhongwei Fu,Yunyun Zhong,Yuehong Yu,Lizhen Long,Min Xiao,Dongmei Han,Shuanjin Wang,Yuezhong Meng
A new class of TiO2-doped CeO2 nanorods was synthesized via a modified hydrothermal method, and these nanorods were first used as catalysts for the direct synthesis of dimethyl carbonate (DMC) from CO2 and CH3OH in a fixed-bed reactor. The micromorphologies and physical–chemical properties of nanorods were characterized by transmission electron microscopy, X-ray diffraction, N2 adsorption, inductively coupled plasma atomic emission spectrometry, X-ray photoelectron spectroscopy, and temperature-programmed desorption of ammonia and carbon dioxide (NH3-TPD and CO2-TPD). The effects of the TiO2 doping ratio on the catalytic performances were fully investigated. By doping TiO2, the surface acid–base sites of CeO2 nanorods can be obviously promoted and the catalytic activity can be raised evidently. Ti0.04Ce0.96O2 nanorod catalysts exhibited remarkably high activity with a methanol conversion of 5.38% with DMC selectivity of 83.1%. Furthermore, kinetic and mechanistic investigations based on the initial rate method were conducted. Over the Ti0.04Ce0.96O2 nanorod catalyst, the apparent activation energy of the reaction was 46.3 kJ/mol. The reaction rate law was determined to be of positive first-order to the CO2 concentration and the catalyst loading amount. These results were practically identical with the prediction of the Langmuir–Hinshelwood mechanism in which the steps of CO2 adsorption and activation are considered as rate-determining steps.
研究领域:
催化
·
化学工程
·
材料科学
·
环境化学
✓ 已验证
DOI
PubMed
危险品化学品经营许可证（带存储）