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Marko Chigondo, Hugues Kamdem Paumo, Madhumita Bhaumik, Kriveshini Pillay, Arjun Maity
Hydrous CeO2 -Fe3 O4 (HCeFe) decorated polyaniline nanofibers (HCeFe NFs) were obtained through a simple co-precipitation deposition approach on pre-synthesized polyaniline nano-fibers (PANI NFs), and evaluated as adsorbents for fluoride removal from synthetic and real water samples. Field emission scanning electron microscopy/energy dispersive X-ray spectroscopy (FE-SEM/EDS), high resolution-transmission electron microscopy (HR-TEM), Braunauer-Emmett-Teller (BET), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric-differential thermal analysis (TGA-DTA), X-ray photoelectron spectroscopy (XPS) and dynamic mechanical analysis (DMA) techniques were used to characterize the hybrid nanomaterials...
July 31, 2018: Journal of Colloid and Interface Science
Luca Brugnoli, Anna Maria Ferrari, Bartolomeo Civalleri, Alfonso Pedone, Maria Cristina Menziani
CeO2 based materials are very attractive as catalytic component for industrial processes and environment friendly technologies, therefore, a reliable and computationally affordable theoretical description of the main properties of ceria is needed. In particular, the description of the interconversion between the Ce(IV) and Ce(III) oxidation states, on which lies the main chemical features of the Cerium Oxide, results quite challenging at the Density Functional Theory level. Here, we tested several Density functional approximations, spanning from GGA to Hybrid (Global, Meta-Global and Range Separated Corrected) functionals, on the structural, vibrational, electronic and thermochemical properties of bulk CeO2 and Ce2O3...
August 10, 2018: Journal of Chemical Theory and Computation
Yingwei Li, Yuxiang Chen, Stephen D House, Shuo Zhao, Zahid Wahab, Judith C Yang, Rongchao Jin
Catalysts based on atomically precise gold nanoclusters serve as an ideal model to relate the catalytic activity to the geometrical and electronic structures as well as the ligand effect. Herein, we investigate three series of ligand (thiolate) protected gold nanoclusters, including Au38(SR)24, Au36(SR')24, and Au25(SR")18, with a focus on their interface effects using carbon monoxide (CO) oxidation as a probe reaction. The first comparison is within each series, which reveals the same trend for the three series that, rather than the bulkiness of carbon tails as commonly thought, the steric hindrance of ligands at the interface between the thiolate, Au, and CeO2 inhibits CO adsorption onto Au sites and hence adversely affects the activity of CO oxidation...
August 9, 2018: ACS Applied Materials & Interfaces
Negar Alizadeh, Abdollah Salimi, Rahman Hallaj
We present a paper-based microfluidic colorimetric immunosensor for the detection of carcinoembryonic antigen (CEA), using Co2 (OH)2 CO3 -CeO2 nanocomposite with extraordinary intrinsic peroxidase like activity. The morphology and composition of the nanocomposite characterized with Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) techniques. The proposed immunosensor facilely fabricated by loading mixture of ionic liquid and chitosan functionalized primary antibodies (Ab1 ) on the surface of paper...
November 1, 2018: Talanta
Jay R Reichman, Paul T Rygiewicz, Mark G Johnson, Michael A Bollman, Bonnie M Smith, Q Todd Krantz, Charly J King, Christian Andersen
It is important to understand molecular effects on plants exposed to compounds released from use of products containing engineered nanomaterials. Here, we present mRNA sequencing data on transcriptome impacts to Douglas-fir following 2 weeks of sublethal exposure to 30:1 diluted airborne emissions released from combustion of diesel fuel containing engineered CeO2 nanoparticle catalysts (DECe). Our hypothesis was that chamber exposure to DECe would induce distinct transcriptome changes in seedling needles compared with responses to conventional diesel exhaust (DE) or filtered DECe Gas Phase...
August 3, 2018: Environmental Science & Technology
Xiaoxuan Wang, Wenjie Sun, Sha Zhang, Hamidreza Sharifan, Xingmao Ma
The accumulation of arsenic (As) in rice grains depends greatly on the redox chemistry in rice rhizosphere. Intentional or accidental introduction of strong oxidizing or reducing agents such as metallic engineered nanoparticles (ENPs) into the plant-soil ecosystem can change As speciation and plant uptake. However, investigation on the effects of ENPs on plant uptake of co-occurring redox sensitive heavy metals and their speciation in plant tissues is scarce. We investigated the mutual effects of two commonly encountered ENPs, cerium oxide nanoparticles (CeO2 NPs) and zinc oxide nanoparticles (ZnO NPs), and two inorganic species of As on their uptake and accumulation in rice seedlings in a hydroponic system...
August 3, 2018: Environmental Science & Technology
Yulong Liao, Botao Yuan, Dainan Zhang, Jin Zhang, Xiaoyi Wang, Peng Deng, Kaibin Zhang, Huaiwu Zhang, Quanjun Xiang, Zhiyong Zhong
Heterostructured TiO2 materials are of great importance in electronic and photochemical related applications. We report herein a simple, low-cost, and scalable fabrication of metal oxides heterostructured TiO2 nanotube arrays (NTAs) through a combined strategy of thermal decomposition and crystallization. Various M x O y /TiO2 heterostructured films (M = Zn, Ce, Cu, Cr...) were obtained by using TiO2 NTAs as "nano-containers" as well as "nano-reactors", while using M(CH3 COO) x solutions as the precursors...
August 3, 2018: Inorganic Chemistry
Nicholas K Geitner, Jane L Cooper, Astrid Avellan, Benjamin T Castellon, Brittany G Perrotta, Nathan Bossa, Marie Simonin, Steven M Anderson, Sayako Inoue, Michael F Hochella, Curtis John Richardson, Emily S Bernhardt, Gregory V Lowry, P Lee Ferguson, Cole W Matson, Ryan S King, Jason M Unrine, Mark R Wiesner, Heileen Hsu-Kim
Trace metals associated with nanoparticles are known to possess reactivities that are different from their larger-size counterparts. However, the relative importance of small relative to large particles for the overall distribution and biouptake of these metals is not as well studied in complex environmental systems. Here, we have examined differences in the long-term fate and transport of ceria (CeO2 ) nanoparticles of two different sizes (3.8 vs. 185 nm), dosed weekly to freshwater wetland mesocosms over 9 months...
August 1, 2018: Environmental Science & Technology
Ricardo Tighe-Neira, Erico Carmora, Gonzalo Recio, Adriano Nunes-Nesi, Marjorie Reyes-Diaz, Miren Alberdi, Zed Rengel, Claudio Inostroza-Blancheteau
The applications of nanoparticles continue to expand into areas as diverse as medicine, bioremediation, cosmetics, pharmacology and various industries, including agri-food production. The widespread use of nanoparticles has generated concerns given the impact these nanoparticles - mostly metal-based such as CuO, Ag, Au, CeO2 , TiO2 , ZnO, Co, and Pt - could be having on plants. Some of the most studied variables are plant growth, development, production of biomass, and ultimately oxidative stress and photosynthesis...
July 19, 2018: Plant Physiology and Biochemistry: PPB
Kuan Ding, Aoxi He, Daoxu Zhong, Liangliang Fan, Shiyu Liu, Yunpu Wang, Yuhuan Liu, Paul Chen, Hanwu Lei, Roger Ruan
The excessive oxygen content in biomass obstructs the production of high-quality bio-oils. In this work, we developed a tandem catalytic bed (TCB) of CeO2 and HZSM-5 in an analytical pyrolyzer to enhance the hydrocarbon production from co-pyrolysis of corn stover (CS) and LDPE. Results indicated that CeO2 could remove oxygen from acids, aldehydes and methoxy phenols, producing a maximum yield of hydrocarbons of 85% and highest selectivity of monocyclic aromatics of 73% in the TCB. The addition of LDPE exhibited a near-complete elimination of oxygenates, leaving hydrocarbons as the overwhelming products...
July 21, 2018: Bioresource Technology
Binhang Yan, Siyu Yao, Shyam Kattel, Qiyuan Wu, Zhenhua Xie, Elaine Gomez, Ping Liu, Dong Su, Jingguang G Chen
Ethylene (C2 H4 ) is one of the most important raw materials for chemical industry. The tandem reactions of CO2 -assisted dehydrogenation of ethane (C2 H6 ) to ethylene creates an opportunity to effectively use the underutilized ethane from shale gas while mitigating anthropogenic CO2 emissions. Here we identify the most likely active sites over CeO2 -supported NiFe catalysts by using combined in situ characterization with density-functional theory (DFT) calculations. The experimental and theoretical results reveal that the Ni-FeO x interfacial sites can selectively break the C-H bonds and preserve the C-C bond of C2 H6 to produce ethylene, while the Ni-CeO x interfacial sites efficiently cleave all of the C-H and C-C bonds to produce synthesis gas...
July 30, 2018: Proceedings of the National Academy of Sciences of the United States of America
Yaping Zhang, Xiupeng Yue, Tianjiao Huang, Kai Shen, Bin Lu
TiO₂-ZrO₂ (Ti-Zr) carrier was prepared by a co-precipitation method and 1 wt. % V₂O₅ and 0.2 CeO₂ (the Mole ratio of Ce to Ti-Zr) was impregnated to obtain the V₂O₅-CeO₂/TiO₂-ZrO₂ catalyst for the selective catalytic reduction of NO x by NH₃. The transient activity tests and the in situ DRIFTS (diffuse reflectance infrared Fourier transform spectroscopy) analyses were employed to explore the NH₃-SCR (selective catalytic reduction) mechanism systematically, and by designing various conditions of single or mixing feeding gas and pre-treatment ways, a possible pathway of NO x reduction was proposed...
July 28, 2018: Materials
Hua-Yao Li, Chul-Soon Lee, Do Hong Kim, Jong-Heun Lee
Ammonia (NH3) is an irritant gas with a unique pungent odor; sub-parts per million (ppm)-level breath ammonia is a medical biomarker for kidney disorders and Helicobacter pylori (H. pylori) bacteria-induced stomach infections. The humidity varies both in ambient environment and exhaled breath and thus humidity dependence of gas sensing characteristics is a great obstacle for real-time applications. Herein, flexible, humidity-independent, and room temperature ammonia sensors are fabricated by the thermal evaporation of CuBr on a polyimide substrate and subsequent coating of a nano-scale moisture-blocking CeO2 overlayer by electron-beam evaporation...
July 27, 2018: ACS Applied Materials & Interfaces
Atul Dhall, William Self
Cerium oxide nanoparticles (CeNPs) exhibit antioxidant properties both in vitro and in vivo. This is due to the self-regeneration of their surface, which is based on redox-cycling between 3+ and 4+ states for cerium, in response to their immediate environment. Additionally, oxygen vacancies in the lattice structure allow for alternating between CeO₂ and CeO2- x during redox reactions. Research to identify and characterize the biomedical applications of CeNPs has been heavily focused on investigating their use in treating diseases that are characterized by higher levels of reactive oxygen species (ROS)...
July 24, 2018: Antioxidants (Basel, Switzerland)
Zong Hu, Zheng Wang, Yun Guo, Li Wang, Yanglong Guo, Jinshui Zhang, Wangcheng Zhan
Ruthenium (Ru) nanoparticles (∼3 nm) with mass loading ranging from 1.5 to 3.2 wt % are supported on a reducible substrate, cerium dioxide (CeO2 , the resultant sample is called Ru/CeO2 ), for application in the catalytic combustion of propane. Because of the unique electronic configuration of CeO2 , a strong metal-support interaction is generated between the Ru nanoparticles and CeO2 to stabilize Ru nanoparticles for oxidation reactions well. In addition, the CeO2 host with high oxygen storage capacity can provide an abundance of active oxygen for redox reactions and thus greatly increases the rates of oxidation reactions or even modifies the redox steps...
August 2, 2018: Environmental Science & Technology
Qingqing Li, Jiwei Liu, Yunhao Zhao, Xuebing Zhao, Wenbin You, Xiao Li, Renchao Che
Recently, it is still a great challenge to develop a new type of absorber that possesses special advantages of low cost, ultrawide bandwidth, and strong absorption intensity. Herein, the unique "Matryoshka doll"-like CeO2 microspheres with tunable interspaces were successfully synthesized by a facile and template-free method. The as-synthesized hierarchical yolk-shell CeO2 microspheres were constructed by a layer of outer shell and multiple inner cores. The interspace gap of the microspheres can be simply adjusted only by altering the solvothermal reaction time...
August 3, 2018: ACS Applied Materials & Interfaces
Ke Yang, Wei-Qing Huang, Wangyu Hu, Gui-Fang Huang, Shuangchun Wen
Silicene has shown great potential for applications as a versatile material in nanoelectronics and is particularly promising as a building block for spintronic applications. Unfortunately, despite its intriguing properties, such as a relatively large spin-orbit interaction, one of the greatest obstacles to the use of silicene as a host material in spintronics is its lack of magnetism or a topological phase transition owing to the silicene-substrate interaction, which influences its fundamental properties and has yet to be fully investigated...
August 2, 2018: Nanoscale
Lizhai Zhang, Qinglong Fang, Yuhong Huang, Kewei Xu, Paul K Chu, Fei Ma
Oxygen vacancies (Ov ) as the active sites have significant influences on the gas sensing performance of metal oxides, and self-doping of Ce3+ in CeO2 might promote the formation of oxygen vacancies. In this work, hydrothermal process is adopted to fabricate the composites of graphene and CeO2 nanoparticles, and the influences of oxygen vacancies as well as Ce3+ ions on the sensing response to NO2 are studied. It is found that the sensitivity of the composites to NO2 increases gradually, as the proportion of Ce3+ relative to all of the cerium ions is increased from 14...
August 1, 2018: Analytical Chemistry
Junhao Li, Zhongqi Liu, Ruigang Wang
The effects of support structure and reducibility, oxidation and reduction treatment and ruthenium loading amount were studied in SiO2 nanospheres and CeO2 nanorods supported ruthenium catalysts on CO oxidation. 0.4, 1.0 and 5.0 wt% Ru were impregnated on SiO2 nanospheres and CeO2 nanorods using precipitation method and then the samples were oxidized in air. Half of the oxidized samples were also further reduced under hydrogen atmosphere to compare the effect of reduction treatment on the catalytic activity...
July 19, 2018: Journal of Colloid and Interface Science
Pierangelo Bellio, Carla Luzi, Alisia Mancini, Salvatore Cracchiolo, Maurizio Passacantando, Letizia Di Pietro, Mariagrazia Perilli, Gianfranco Amicosante, Sandro Santucci, Giuseppe Celenza
BACKGROUND: Therapeutic options against Multi Drug Resistant (MDR) pathogens are limited and the overall strategy would be the development of adjuvants able to enhance the activity of therapeutically available antibiotics. Non-specific outer membrane permeabilizer, like metal-oxide nanoparticles, can be used to increase the activity of antibiotics in drug-resistant pathogens. The study aims to investigate the effect of cerium oxide nanoparticles (CeO2 NPs) on bacterial outer membrane permeability and their application in increasing the antibacterial activity of antibiotics against MDR pathogens...
July 17, 2018: Biochimica et Biophysica Acta
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