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Deshetti Jampaiah, Anastasios Chalkidis, Ylias M Sabri, Suresh K Bhargava
The necessity to drastically act against mercury pollution has been emphatically addressed by the United Nations. Coal-fired power plants contribute a great deal to the anthropogenic emissions; therefore, numerous sorbents/catalysts have been developed to remove elemental mercury (Hg0 ) from flue gases. Among them, ceria (CeO2 ) has attracted significant interest, due to its reversible Ce3+ /Ce4+ redox pair, surface-bound defects and acid-base properties. The removal efficiency of Hg0 vapor depends among others, on the flue gas composition and temperature...
December 10, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Fazel Abdolahpur Monikh, Latifeh Chupani, Eliška Zusková, Ruud Peters, Marie Vancová, Martina G Vijver, Petr Porcal, Willie Jgm Peijnenburg
A multistep sample preparation method was developed to separate metal-based engineered nanoparticles (ENPs) from biological samples. The method was developed using spiked zebrafish tissues and standard titanium dioxide (TiO2) and cerium dioxide (CeO2) ENPs. Single-particle inductively coupled plasma mass spectrometry was used to quantify the separated particles in terms of number concentration. This method demonstrated mass recoveries of more than 90% and did not strikingly alter the median particles size. High number recoveries were calculated for CeO2 ENPs (>84%)...
December 11, 2018: Environmental Science & Technology
Lellala Kashinath, Keerthiraj Namratha, Kullaiah Byrappa
A facile fabrication and processing of cerium oxide-graphene oxide (CeO2 -GO) hybrid nanocomposites without the use of any surfactant or any organic solvents using chemical method and treatment with microwave irradiation technique are reported. In-situ hexagonal nano cerium oxide particles embedded on the layered surface of GO sheets were investigated for the photodegradation of dyes, removal of chromium Cr(VI) ions and against antibacterial studies. The results imply that hybrid nanocomposites shows enhanced 5-folds of photocatalytic activities in UV (ultraviolet) light irradiation and exhibited rapid efficiency in the elimination of chromium ion better than the pure GO and CeO2 , which are inhibited by competent photosensitive electron inoculation and controlling the electron-hole recombination...
February 2019: Journal of Environmental Sciences (China)
Masaaki Haneda, Yuya Katsuragawa, Yuichiro Nakamura, Atsuya Towata
The promoting effect of CeO2 on the catalytic performance of Y2 O3 , which is moderately active catalyst, for the oxidative coupling of methane (OCM) reaction was investigated. The addition of CeO2 into Y2 O3 by coprecipitation method caused a significant increase in not only CH4 conversion but also C2 (C2 H6 /C2 H4 ) selectivity in the OCM reaction. C2 yield at 750 °C was increased from 5.6% on Y2 O3 to 10.2% on 3 mol% CeO2 /Y2 O3 . Further increase in the CeO2 loading caused an increase in non-selective oxidation of CH4 to CO2 ...
2018: Frontiers in Chemistry
Naoyoshi Nunotani, Abdul Rohman Supandi, Pil-Gyu Choi, Nobuhito Imanaka
Catalytic liquid-phase oxidation using a catalyst and oxygen gas (Catalytic wet air oxidation, CWAO) is one of the most promising technology to remove hazardous organic compounds in wastewater. Up to now, various heterogeneous catalysts have been reported for phenolic compounds decomposition. The CeO2 -ZrO2 based catalysts have been recently studied, because CeO2 -ZrO2 works as a promoter which supplies active oxygen species from inside the lattice to the active sites. Since it is difficult to dissolve oxygen gas into water, the use of the promoter is effective for realizing the high catalytic activity at moderate conditions...
2018: Frontiers in Chemistry
Xiuzhong Wang, Biwu Liu, Juewen Liu
Chemical reactions without an obvious optical signal change, such as fluorescence or color, are difficult to monitor. Often, more advanced analytical techniques such as HPLC and mass spectroscopy are needed. It would be useful to convert such reactions to changes in optical signals. In this work, we demonstrate that fluorescently labeled DNA oligonucleotides adsorbed on nanomaterials can probe such reactions, and oxidation of phosphorus containing species was used as an example. Various metal oxides were tested and CeO2 nanoparticles were found to be the most efficient for this purpose...
December 5, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Yu Long, Zekun Gao, Jiaheng Qin, Peng Wang, Wei Wu, Lin Zhang, Zhengping Dong, Jiantai Ma
Four types of core-shell materials with magnetic Fe3 O4 microparticles as the core were prepared through different approaches using dopamine, glucose, tetrabutyl orthotitanate (TBOT), and tetraethyl orthosilicate (TEOS) as the shell precursor, respectively. CeO2 nanoparticles (NPs) was successfully immobilized onto these supports to fabricate efficient catalysts for the tandem catalytic synthesis of imines from benzyl alcohols and anilines at low temperature under air atmosphere. The as-prepared catalysts were detailedly characterized by TEM, EDX, XRD, FT-IR, XPS VSM, ICP, and CO2 -TPD...
November 24, 2018: Journal of Colloid and Interface Science
Jing Ouyang, Zai Zhao, Huaming Yang, Junkai He, Steven L Suib
Macroporous CeO2 -ZrO2 (CZ) solid solutions with gradually changing ceria content were prepared through the EISA method. Pore sizes of the samples are about 100 nm-1 μm and pore walls are 100 nm-1.5 μm. The surface and near surface reduction bands of Ce4+ below 600 °C were maximized for the Ce0.5 Zr0.5 O2 sample (C5) according to the quantitative de-convolution to the acquired TPR curves. The area percentage of the O2- 2p6  → Ce3+ 3d9 4f2 electronic transition band on XPS spectra, which related to the concentration of the Ce3+ , was found to be a function of the ceria content...
November 22, 2018: Journal of Hazardous Materials
Xiaohu Yu, Artem R Oganov, Qiang Zhu, Fei Qi, Guangrui Qian
Using evolutionary structure prediction and ab initio thermodynamics, we determine stable compositions and structures of small CemOn and FemOn clusters at realistic temperatures and oxygen pressures. We use second energy differences as the criterion determining clusters of particular stability ("magic" clusters), whereas HOMO-LUMO gaps are used to gauge chemical inertness - i.e. the ability of a cluster to survive in a complex chemical environment. We find that, similar to atomic nuclei (which are clusters made of neutrons and protons), compositional space of two-component clusters also has ridges and islands of stability, surrounded by sea of instability...
November 30, 2018: Physical Chemistry Chemical Physics: PCCP
Minghan Hu, Karsten Korschelt, Melanie Viel, Nadine Wiesmann, Michael Kappl, Jürgen Brieger, Katharina Landfester, Héloïse Thérien-Aubin, Wolfgang Tremel
Electrospun polymer mats are widely used in tissue engineering, wearable electronics, and water purification. However, in many environments the polymer nanofibers prepared by electrospinning suffer from biofouling during long-term usage, resulting in persistent infections and device damage. Herein, we describe the fabrication of polymer mats with CeO2-x nanorods that can prevent biofouling in aqueous environment. The embedded CeO2-x nanorods are functional mimics of natural haloperoxidases that catalyze the oxidative bromination of Br- and H2O2 to HOBr...
November 30, 2018: ACS Applied Materials & Interfaces
Chulun Shao, Aijun Shen, Meng Zhang, Xianfu Meng, Chaolin Song, Yanyan Liu, Xiaolong Gao, PeiJun Wang, Wenbo Bu
The specific characteristics of the tumor vascular microenvironment such as microvascular permeability and water diffusion have been demonstrated to play essential roles in the evaluation of infiltration of tumors. However, at present, there are few contrast agents (CAs) for magnetic resonance imaging (MRI) to enhance the sensitivity to acquire this vital information. Herein, we develop Gd doped (CeO2:Gd) nanoparticles as CA to detect the tumor vascular microenvironment with high sensitivity. The lattice oxygen vacancies on the surface of CeO2:Gd nanoparticles could bind considerable water molecules to improve the r1 value, achieving an excellent dynamic contrast-enhanced perfusion weighted imaging (DCE-PWI) performance for the measurement of microvascular permeability...
November 29, 2018: ACS Nano
Nora Houlihan, Nicholas Karker, Radislav A Potyrailo, Michael Andrew Carpenter
Next-generation gas-sensor technologies are needed for diverse applications including environmental surveillance, occupational safety, and industrial process control. However, the dynamic range using existing sensors is often too narrow to meet demands. In this work plasmonic films of Au-CeO2 that detect hydrogen with 0.38% and 60% lower and upper detection limits in an oxygen-free atmosphere experiment are demonstrated. The observed 15nm peak shift was 4x stronger versus other plasmonic H2 sensors. The proposed sensing mechanism that involves H2 dissociation by Auδ+ nanoparticles, was validated using XPS, kinetics, and Arrhenius studies...
November 28, 2018: ACS Sensors
Masazumi Tamura, Keitaro Matsuda, Yoshinao Nakagawa, Keiichi Tomishige
CeO2 calcined at 1273 K showed higher activity per surface area than other metal oxides in the ring-opening polymerization of trimethylene carbonate under neat conditions without any additives, providing metal-free and additive-free poly(trimethylene carbonate) diols with no ether bonds with high selectivity. It was demonstrated that CeO2 was a robust and reusable heterogeneous catalyst.
November 28, 2018: Chemical Communications: Chem Comm
Feng Wu, Qing Li, Lai Chen, Yun Lu, Yuefeng Su, Liying Bao, Renjie Chen, Shi Chen
Nickel-rich cathode material is one of the most promising cathode materials for high-energy lithium-ion batteries. However, the structure stability, thermodynamic stability, cycle and rate performances of Ni-rich materials still need to be further improved. In this research, rare earth element Ce is employed to reinforce the interface of Ni-rich cathode material both internally and externally. It has been determined that high valence state Ce4+ can easily cause the oxidization of Ni2+ to Ni3+ when being doped into the material due to its strong oxidation performance, thus reducing Li+/Ni2+ mixing degree...
November 27, 2018: ChemSusChem
Zi-Xiang Cui, Ya-Nan Feng, Yong-Qiang Xue, Juan Zhang, Rong Zhang, Jie Hao, Jia-Yi Liu
Nanomaterials have excellent adsorption performance, which mainly depends on the adsorption thermodynamics that is related to the shape of the nanoparticles that make up the nanomaterial, but the effects of shape on the thermodynamics of adsorption are not fully clear. In this paper, theoretically, the general formulae of adsorption thermodynamic properties for nanoparticles with different shapes and different sizes were derived, and the influencing regularities and mechanisms on adsorption thermodynamic properties were discussed...
November 27, 2018: Physical Chemistry Chemical Physics: PCCP
Lili Tong, Xiuxiu Wang, Wen Gao, Zhenhua Liu, Zhenzhen Chen, Guiying Cheng, Wenhua Cao, Meiju Sui, Bo Tang
Effective and sensitive monitoring of arsenate in drinking water is significant for risk management of public health. Here, we demonstrated that CeO2 nanowire acted as an efficient quencher for small fluorescent molecules with phosphate group, BODIPY-adenosine triphosphate (BODIPY-ATP) and riboflavin-5'-phosphate (Rf-P), and developed CeO2 nanowire-BODIPY-ATP platform for highly selective and sensitive detection of arsenate. The response strategy was based on the competitive coordination chemistry of CeO2 nanowire between arsenate and phosphate group of BODIPY-ATP...
November 27, 2018: Analytical Chemistry
Chao Wang, Feng Yu, Mingyuan Zhu, Changjin Tang, Ke Zhang, Dan Zhao, Lin Dong, Bin Dai
We first present preparation of MnOx -CeO2 -Al2 O3 catalysts with varying Mn contents through a self-propagating high-temperature synthesis (SHS) method, and studied the application of these catalysts to the selective catalytic reduction of NOx with NH3 (NH3 -SCR). Using the catalyst with 18 wt.% Mn (18MnCe1Al2), 100% NO conversion was achieved at 200°C and a gas hourly space velocity of 15384hr-1 , and the high-efficiency SCR temperature window, where NO conversion is greater than 90%, was widened to a temperature range of 150-300°C...
January 2019: Journal of Environmental Sciences (China)
Suyu Wang, Fan Gao, Yan Zhao, Ning Liu, Taizhe Tan, Xin Wang
In this work, a modified separator coated with a functional layer of reduced graphene oxide (RGO) anchored by cerium oxide (CeO2 ) nanoparticles was developed. The superior conductivity of RGO and chemical immobilization of high-ordered sulfur-related species (mainly Li2 Sn 4 ≤ n ≤ 8) of CeO2 yielded batteries with enhanced characteristics. A remarkable original capacity of 1136 mAh g-1 was obtained at 0.1 C with capacity retention ratio of 75.7% after 100 charge/discharge cycles. Overall, these data indicate that the separator with CeO2 /RGO composite is promising to suppress the shuttling of polysulfides for better utilization of the active material...
November 23, 2018: Nanoscale Research Letters
Shanker Kalakotla, Naradala Jayarambabu, G Krishna Mohan, Rabiatul Basria S M N Mydin, V Ramamohan Gupta
Diabetes mellitus is one of the threatening, non-communicable and chronic ailments worldwide since ancient times to the current stage of human existence. The utilization of nanoparticles as a medicine in the treatment of diabetes is an attractive proposition. In the present study, herbal mediated cerium oxide nanoparticles (HMCeO2 NPs), herbal mediated silver nanoparticles (HMAg NPs) and Lawsonia intermix extract (LIE) was evaluated for them for in-vivo hypoglycemic effect and compared the potency. The resulting HMCeO2 NPs, HMAg NPs and Lawsonia inermis have been characterized by different analytical equipments such as X-ray Diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Particle size analyzer (PSA), Field emission scanning electron microscope (FESEM) and High resolution transmission electron microscope (HRTEM)...
November 13, 2018: Colloids and Surfaces. B, Biointerfaces
Shaikh Parwaiz, Owais Ahmed Malik, Debabrata Pradhan, Mohammad Mansoob Khan
This paper deals with the Cobalt-doped Ceria/reduced graphene oxide (Co-CeO2/rGO) nanocomposite as supercapacitor and modeling of its cyclic voltammetry behavior using Artificial Neural Network (ANN) and Random Forest Algorithm (RFA). A good agreement was found between experimental results and the predicted values generated by using ANN and RFA. Simulation results confirmed the accuracy of the models compared to measurements from supercapacitor module power-cycling. A comparison of best performance between ANN and RFA models shows that the ANN models performed better (value of coefficient of determination > 0...
November 20, 2018: Journal of Chemical Information and Modeling
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