Synthesis of mono‐dispersed ceria hollow nanospheres by a hydrothermal method

Abstract

Mono-dispersed ceria (CeO 2) hollow nanospheres about 400 nm have been prepared via a facile one-step hydrothermal method, wherein cerium nitrate hexahydrate (Ce(NO 3) 3 •6H 2 O) was used as cerium sources with the assistance of polyvinylpyrrolidone (PVP) in the ethylene glycol aqueous solution. X-ray diffraction, X-ray photoelectron spectra, scanning electron microscope, transmission electron microscope, nitrogen adsorption-desorption and Fourier transform infrared results indicate that PVP can improve the dispersion and control the morphology and sizes of CeO 2 hollow nanospheres as a surfactant, and the internal diameter of CeO 2 hollow nanosphere gradually increases with reaction time. Based on the time-dependent experiment, the formation mechanism was proposed and discussed. These CeO 2 hollow nanospheres show an excellent adsorption rate of heavy metal ions for Cr(VI) and the adsorption rate is about 70%. The CeO 2 hollow nanospheres also had exhibited superior performance in the degradation of methyl orange dye.

An Electrocatalyst for a Hydrogen Evolution Reaction in an Alkaline Medium: Three‐Dimensional Graphene Supported CeO2 Hollow Microspheres

“…For CeO 2 hollow microspheres, the four well‐resolved peaks located at 882.5, 889.2, 898.6, and 901.3 eV originate from Ce 4+ 3d 5/2 , and the two peaks centered at 907.2 and 917.0 eV correspond to Ce 4+ 3d 3/2 , . In addition, a shoulder peak at 885.6 eV referring to Ce 3+ 3d 5/2 can be observed, suggesting the presence of a small amount of Ce 3+ ions in the CeO 2 , which is consistent with the literature reports . In comparison to CeO 2 hollow microspheres, 3D‐rGO‐CeO 2 , and CeO 2 /rGO show similar Ce 4+ 3d 5/2 peaks, but the Ce 4+ 3d 3/2 peak at 907.2 eV shifts to 907.7 eV for 3D‐rGO‐CeO 2 and CeO 2 /rGO, suggesting the existence of electron interactions between CeO 2 and rGO in the composites.…”

“…Graphite oxide was prepared by a modified Hummers' method using natural flake graphite as raw materials , . CeO 2 hollow microspheres were prepared using a method slightly modified from a procedure reported in the literature …”

Preparation and Sound Absorption Properties of a Barium Titanate/Nitrile Butadiene Rubber–Polyurethane Foam Composite with Multilayered Structure

“…A lot of work has been done on the preparation of inorganic nanoparticles and the combination of polymers to obtain functional polymer composites [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ]. In this study, a new type of material with a multilayered structure was prepared to absorb sound.…”

Preparation and sound absorption properties of barium titanate/nitrile butadiene rubber-polyurethane foam composites with stratified structure

“…A lot of work has been done and previously reported by the author on the preparation of organic-inorganic composites and the structure design of sound absorbing materials. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] Barium titanate/nitrile butadiene rubber (BT/NBR) composite, a kind of common piezoelectric composite, has ne piezoelectric property and relatively higher density. This combination of piezoceramics llers and polymer matrix gives the BT/NBR composite relatively higher airow resistivity which is benecial to reect the sound wave and dissipate the sound energy.…”