JOURNAL OF RARE EARTHS
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2017
·
IF 2.429
Hong DING,Yanling ZHAO,Qianlin DUAN,Junwen WANG,Kan ZHANG,Guangyue DING,Xianmei XIE,Chuanmin DING
Fe 3 O 4 @SiO 2 magnetic nanoparticles functionalized with mesoporous cerium oxide (Fe 3 O 4 @SiO 2 @ m CeO 2 ) was fabricated as a novel adsorbent to remove phosphate from water. The prepared adsorbent was characterized by X-ray diffractometry (XRD), transmission electron microscopy (TEM), nitrogen adsorption-desorption and vibrating sample magnetometry (VSM), and its phosphate removal performance was investigated through the batch adsorption studies. Characterization results confirmed that mesoporous cerium oxide was successfully assembled on the surface of Fe 3 O 4 @SiO 2 nanoparticles, and the synthesized adsorbent possessed a typical core-shell structure with a BET surface area of 195 m 2 /g, accessible mesopores of 2.6 nm, and the saturation magnetization of 21.11 emu/g. The newly developed adsorbent had an excellent performance in adsorbing phosphate, and its maximum adsorption capacity calculated from the Langmuir model was 64.07 mg/g. The adsorption was fast, and the kinetic data could be best fitted with the pseudo-second-order kinetic model. The phosphate removal decreased with the increase of solution pH (2 to 10), while the higher ionic strength slightly promoted the phosphate adsorption. The presence of Cl − and SO 4 2− could enhance the adsorption of phosphate whereas HCO 3 − had interfering effect on the phosphate adsorption. The adsorption mechanism was studied by analyzing Zeta potential and FTIR spectroscopy, and the results indicated that the replacement of the surface hydroxyl groups by phosphate ions with the formation of inner-sphere complex played a key role in the phosphate adsorption. The spent adsorbent could be quickly separated from aqueous solution with the assistance of the external magnetic field, and the adsorbed phosphate could be effectively desorbed using a 1 mol/L NaOH solution.
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
高影响因子
Catalysts
·
2019
·Vol. 9
·期 6
·519
·
IF 3.444
Jiaming Shao,Fawei Lin,Yan Li,Hairong Tang,Zhihua Wang,Peixi Liu,Guanyi Chen
NO oxidation was conducted over MnOx-CeO2catalysts, which were synthesized by the co-precipitation method. The calcination temperature and third metal doping were the main considerations. MnCe catalysts calcined at 350 °C and 450 °C attained the highest NO conversion efficiency, compared to 550 °C. XRD results suggested that the higher the calcination temperature, the higher the crystallization degree, which led to a negative effect on catalytic activity. Subsequently, Sn, Fe, Co, Cr, and Cu were separately doped into MnCe composites, but no improvement was observed for these trimetallic catalysts in NO conversion. Nevertheless, MnCeSn, MnCeFe, and MnCeCo still exhibited a desirable NO conversion efficiency, so they were tested under SO2addition together with MnCe catalyst. Among them, MnCeFe exhibited the highest NO conversion after whole poisoning testing. XPS results indicated that Fe could protect Mn and Ce metal oxides from being reduced during SO2poisoning process. Furthermore, in in-situ DRIFTS measurement, part of nitrate species maintained undestroyed on the MnCeFe catalyst surface after SO2poisoning. These characteristics reinforced that Fe dropping would achieve better performance under SO2atmosphere.Keywords:MnOx-CeO2;co-precipitation;NO oxidation;SO2resistance;metal addition
研究领域:
环境科学
·
催化化学
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DOI
高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Lei Wang,Yonggang Sun,Yulong Ma,Min Xu,Juan Zhang,Yingbo Zhu,Jie Ding,Li Zhu,Jing Ma,Wenxin Ji,Liqiong Wang,Yuanyuan Li
Dual activation of molecular and lattice oxygen is an important step in the catalytic oxidation of volatile organic compounds. Herein, CeO 2 was derived from MOF as an electron donor support to develop a co-catalyst with Pt-Pd alloy nanoparticles (Pt-Pd/CeO 2 ). The Prepared Pt-Pd/CeO 2 exhibits excellent catalytic activity towards toluene oxidation, showing a turnover frequency (TOF 0.26 s −1 ) higher than those of Pt/CeO 2 (0.05 s −1 ) and Pd/CeO 2 (0.02 s −1 ). Several in situ experimental techniques and density functional theory calculations have revealed that the introduction of Pd valence electrons can intensify the electronic metal-support interactions (EMSIs) effects of Pt-Pd/CeO 2 catalysts, which can weaken the Ce-O bond, thereby promoting the production and circulation of lattice oxygen and oxygen vacancies, and modulating the d -band centre to enhance the adsorption and activation of reactants. This study presents a comprehensive investigation of toluene oxidation on alloy-supported catalysts, providing practical guidance for designing reliable catalysts suitable for industrial applications.
研究领域:
催化化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yanzhu Deng,Juwei Du,Yan Zhu,Ling Zhao,Huanwen Wang,Yansheng Gong,Jun Jin,Beibei He,Rui Wang
The development of noble metal-based bifunctional electrocatalysts is the key to driving the sluggish oxygen reduction/evolution reaction (ORR/OER) for rechargeable zinc-air battery applications. There is an urgent need to design and construct robust and cost-efficient bifunctional electrocatalysts . Herein, an interface engineering strategy of Ruddlesden–Popper (RP) perovskite/CeO 2 /carbon heterojunction with core–shell nanostructures is described. Ce-based metal–organic framework derived CeO 2 -C nanosheets are decorated on the surface of RP type perovskite Pr 3 Sr(Ni 0.5 Co 0.5 ) 3 O 10−δ (PSNC) nanofibers . Benefiting from the favorable conductivity, abundant oxygen vacancies and strong interfacial coupling, the hierarchical CeO 2 -C/PSNC electrode delivers a half-wave potential of 0.78 V (ORR), and an OER overpotential of 370 mV at 10 mA cm −2 , respectively. A liquid rechargeable zinc-air battery (ZAB) assembled with CeO 2 -C/PSNC electrocatalysts as the air cathode exhibits a peak power density of 161 mW cm −2 and a long-term cycling life over 219 h. In addition, the CeO 2 -C/PSNC-based all-solid-state cable-type ZAB provides a high open-circuit voltage (∼1.44 V), good flexibility and durability. Our study opens a new insight into the design of efficient electrocatalysts for rechargeable ZABs by constructing hierarchical heterojunctions.
研究领域:
材料科学
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电化学
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能源存储与转换
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
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2024
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IF 2.9
Xinbiao Mao,Mingyu Ou,Wenjun Zhao,Meiqin Shi,Lingxia Zheng
It is a challenge to improve the long-term durability of Pd-based electrocatalysts for oxygen reduction reaction (ORR) in fuel cells. Herein, Pd/CeO2-C-T (T=800, 900 and 1000℃) hybrid catalysts with metal-support interaction are prepared from Ce-based metal organic framework (Ce-MOF) precursor. Abundant tiny CeO2 nanoclusters are produced to form nanorod structures with uniformly distributed carbon through a calcination process. Meanwhile, both carbon and CeO2 nanoclusters have good contact with the following deposited surfactant-free Pd nanoclusters. Benefited from the large specific surface area, good conductivity and structure integrity, Pd/CeO2-C-900 exhibits the best electrocatalytic ORR performance: onset potential of 0.968 V and half-wave potential of 0.857 V, outperforming those obtained on Pd/C counterpart. In addition, the half-wave potential only shifts 7 mV after 6000 cycles of accelerated durability testing, demonstrating robust durability.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2024
·
IF 8.3
Leikai Zhao,Rui Zhang,Guixin Yang,Yuhang Wang,Shili Gai,Xin Zhao,Mengmeng Huang,Piaoping Yang
Foreseen as foundational in forthcoming oncology interventions are multimodal therapeutic systems. Nevertheless, the tumor microenvironment (TME), marked by heightened glucose levels, hypoxia, and scant concentrations of endogenous hydrogen peroxide could potentially impair their effectiveness. In this research, two-dimensional (2D) Ti3C2 MXene nanosheets are engineered with CeO2 nanozymes and glucose oxidase (GOD), optimizing them for TME, specifically targeting cancer therapy. Following our therapeutic design, CeO2 nanozymes, embodying both peroxidase-like and catalase-like characteristics, enable transformation of H2O2 into hydroxyl radicals for catalytic therapy while also producing oxygen to mitigate hypoxia. Concurrently, GOD metabolizes glucose, thereby augmenting H2O2 levels and disrupting the intracellular energy supply. When subjected to a near-infrared laser, 2D Ti3C2 MXene accomplishes photothermal therapy (PTT) and photodynamic therapy (PDT), additionally amplifying cascade catalytic treatment via thermal enhancement. Empirical evidence demonstrates robust tumor suppression both in vitro and in vivo by the CeO2/Ti3C2-PEG-GOD nanocomposite. Consequently, this integrated approach, which combines PTT/PDT and enzymatic catalysis, could offer a valuable blueprint for the development of advanced oncology therapies.
研究领域:
肿瘤学
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纳米医学
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生物材料科学
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产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2024
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IF 4.3
Yao Wang,Ziyan Shen,Liang Zhang,Bing Xu,Kangkang Wang,Zhixian He,Shengnan Zhang
In the context of the escalating global water scarcity issue and the growing awareness of environmental protection, the purification and decontamination of wastewater from different sources have become of utmost necessity. This study was dedicated to fabricating a material capable of effectively mitigating membrane contamination for oil-water separation applications. A superhydrophilic/underwater superoleophobicitic cerium oxide/zirconia composite coating (CeO 2 /ZrO 2 ) was synthesized on a stainless-steel substrate by the sol-gel method. The distinctive rough network structure of the coating enables a water contact angle of 0° and an underwater oil contact angle as high as 169°. The coating not only effectively segregates various oil-water mixtures but also transcends the service life limitations associated with traditional ceramic membranes. Upon 80 min of visible light irradiation, the contact angle of this coating diminishes from 58° to 15°, signifying its self-cleaning ability. It can be considered that this durable and easily repairable coating has a promising application prospect in the field of oil-water separation.
研究领域:
材料科学
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环境科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Shengya Ge,Chenzhang Li,Peiyan Bi,Wei Hong
The operation of direct ethylene glycol fuel cells (DEGFCs) to generate electric energy from ethylene glycol rely on the effective electrocatalysts for the ethylene glycol oxidation reaction (EGOR). The fabrication of EGOR electrocatalysts with high activity, high durability and high resistance for corrosion, is essential important for the DEGFCs. Herein, we report a fabrication of Pd nanoparticles immobilized by the Ce-doped ZIF-67-derived carbon (Pd-CeO 2 /ZDC). The Pd nanoparticles are generated by the in-situ reduction reaction between the H 2 PdCl 4 and the Co nanoparticles formed during the ZIF-67 pyrolysis. Owe to the porous structure and N-doping inherited from the ZIF-67, the Pd and CeO 2 nanoparticles show a uniform distribution. Due to the enhanced EGOR electrooxidation kinetic promoted by the ZIF-67-derived support, the multiple-components and structure synergies, the resultant Pd-CeO 2 /ZDC catalyst affords a EGOR current density of 32.4 mA cm -2 , which is higher than the commercial Pd/C as well as the counterpart Pd/ZDC catalyst without CeO 2 . Furthermore, the Pd-CeO 2 /ZDC catalyst also present a better EGOR durability. This work provides a strategy for the design of EGOR catalyst with multiple-components and desired structure, which may inspire the new tactics for controllable design and synthesis of other electrocatalysts for various electrocatalysis.
研究领域:
材料科学
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电化学
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2018
·
IF 6.434
Guangjun Zhai,Jinguo Wang,Zimei Chen,Shuaifeng Yang,Yong Men
Three-dimensionally ordered macroporous (3DOM) Co 3 O 4 -CeO 2 catalysts with controllable Co/Ce molar ratios synthesized by colloidal crystal template method were developed to catalyze the NO x -assisted soot oxidation for the first time, and the obtained 3DOM Co 3 O 4 -CeO 2 catalysts exhibited highly enhanced soot oxidation activity. Detailed characterizations of 3DOM Co 3 O 4 -CeO 2 catalysts revealed that the highly enhanced soot oxidation activity was originated from the synergistic promoting effect by combining the macroporous effect resulted from the unique 3DOM framework, the chemical nature associated with more Co 3+ reactive sites, the surface enrichment of Ce species and the improved redox properties. Meanwhile, the high NO x storage and oxidation capacity resulted from the integrated respective merits of Co 3 O 4 and CeO 2 also accounted for the enhanced soot oxidation activity via NO x -assisted mechanism. Furthermore, the 3DOM Co 3 O 4 -CeO 2 catalysts demonstrated strong stability because of the surface enrichment of Ce species improving the thermal stability and the robust 3DOM framework inhibiting the structural collapse, showing their potential applications under practical conditions.
研究领域:
催化化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Xing Li,Jun Li,Xixian Yang,Lisheng Deng,Tao Zeng,Hongyu Huang
A porous MnO 2 /CeO 2 composite catalyst was prepared via the template method for the catalytic decomposition of formaldehyde (HCHO). The physical and chemical properties of the catalysts were intensively characterized via X-ray diffraction, transmission electron microscopy, Brunauer-Emmett-Teller analysis, temperature programmed reduction system and X-ray photoelectron spectroscopy. The catalytic activity and stability for HCHO oxidation were measured via a fixed bed reactor, and the effects of physical and chemical properties of the catalysts on their catalytic performance were investigated. The results showed that the porous MnO 2 /CeO 2 catalyst had abundant 3D pore structures, a large specific surface area, an amorphous structure, and an abundance of lattice oxygen species. Thus, the MnO 2 /CeO 2 catalyst had high catalytic activity and stability for HCHO decomposition. This catalyst completely decomposed HCHO at 90 °C and maintained a 99% HCHO conversion rate over 72 h. The highly porous structure reduced the diffusion resistance in the reaction process and improved the efficiency of catalytic decomposition of HCHO. Doping with CeO 2 improved the low temperature oxidation activity and catalytic stability of the porous MnO 2 /CeO 2 catalyst. The porous MnO 2 /CeO 2 composite was an effective agent for the removal of harmful HCHO from the air.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
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2016
·
IF 9.307
Zhixin Zhang,Yehong Wang,Jianmin Lu,Chaofeng Zhang,Min Wang,Mingrun Li,Xuebin Liu,Feng Wang
Conversion of low-carbon olefins to higher alcohols or olefins via the formation of C–C bonds is an increasingly important topic. We herein report an example of converting isobutene and formaldehyde (38 wt % aqueous solution) to 3-methyl-1,3-butanediol (MBD), a precursor for isoprene. The reaction occurs through a Prins condensation–hydrolysis reaction over a praseodymium (Pr)-doped CeO2 catalyst. The best MBD yield (70%) is achieved over the Pr-doped CeO2 catalyst. Catalyst characterizations with high-angle annular dark field transmission electron microscopy (HAADF-TEM), pyridine adsorption infrared (IR) and Raman spectroscopy, and density functional theory (DFT) calculations show that the doped Pr is uniformly and highly dispersed in the CeO2 crystalline phase. In addition, the Pr doping creates more oxygen vacancy sites on CeO2 and thus enhances the Lewis acidity of the catalyst, which is responsible for the catalytic performance of the Pr-CeO2 catalyst.
研究领域:
催化化学
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材料科学
·
有机合成
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2020
·Vol. 35
·期 3
·242-251
·
IF 2.502
Ying Zhou,Guoyou Gan,Zhenhua Ge,Peng Song,Jing Feng
SmTaO4 ceramics have excellent high-temperature phase stabilities and mechanical properties and show great potential for use as next-generation thermal barrier coating (TBC) materials. CeO2–SmTaO4 ceramics are prepared via high-temperature solid–state reaction. It retains a single monoclinic phase structure. Ce4+ was reduced to Ce3+ by high-temperature deoxidation, and the Ce3+ ions substitute for an equal number of Sm3+ ions. The CeO2–SmTaO4 ceramics had lower thermal conductivities [1.09–2.75 W/(m K)] than yttria-stabilized zirconia (YSZ) [2.1–2.7 W/(m K)] at 100–800 °C, which decreased dramatically with increasing temperature. SmTaO4 doped with 2% CeO2 had lower thermal conductivity [1.09 W/(m K), 800 °C] than SmTaO4 [1.42 W/(m K), 800 °C] and 2% ZrO2-doped SmTaO4 ceramics [1.22 W/(m K), 800 °C]. The low thermal conductivity is attributed to Ce3+ substitution for an equal number of Sm3+ ions, and because Ce3+ ions are the strongest phonon scattering centers, they can decrease the phonon mean free path effectively. The thermal expansion coefficient of 8% CeO2–SmTaO4 ceramics is approximately 10.3 × 10−6 K−1 at 1200 °C, which is slightly higher than that of both YSZ (10.0 × 10−6 K−1) and SmTaO4 (9.58 × 10−6 K−1). The outstanding thermophysical properties indicate that CeO2–SmTaO4 ceramics are potential TBC materials.
研究领域:
材料科学
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无机非金属材料
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热障涂层技术
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高温功能材料
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固态化学
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热物理性能
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）