Study on synthesis of rare earth tungsten heteropoly acid glycine composite catalyst and degradation of dyes

Author(s):  
Hao Wang ◽  
Wan-Li Yang ◽  
Rong-Hua Ma ◽  
Yi-Min Tang ◽  
Cheng-Li Zhang
2012 ◽  
Vol 441 ◽  
pp. 568-572 ◽  
Author(s):  
Jun Xiong Lin ◽  
Lan Wang ◽  
Chong Sun

TiO2/Diatomite composite photocatalysts with different TiO2 content were prepared by sol-gel technology. Their structures were characterized by XRD and FTIR analysis, and their photocatalytic performance was examined by decolorizing of two dyes and one real textile wastewater. The influencing factors on the photocatalytic performance were also discussed under different dye concentrations and pH values. The results showed that the optimum preparation process is that the content of TiO2 in the composite photocatalysts is 37.5% and the calcined condition is at 500 °C for 1 hour. Moreover, the dye removal of 200mg/L Rhodamine B by the TiO2-supported diatomite was about 76.9%, and the COD (Chemical Oxygen Demand) removal of one textile wastewater was 60.9%. This composite catalyst exhibited high photocatalytic activity for the removal of dyes selected as model pollutant in aqueous solution.


2002 ◽  
Vol 43 (11) ◽  
pp. 2763-2767 ◽  
Author(s):  
Masahiro Itoh ◽  
Masahiro Masuda ◽  
Ken-ichi Machida

RSC Advances ◽  
2018 ◽  
Vol 8 (31) ◽  
pp. 17582-17594 ◽  
Author(s):  
Umair Alam ◽  
Azam Khan ◽  
Danish Ali ◽  
Detlef Bahnemann ◽  
M. Muneer

In this study, we compared the photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts by studying the degradation of MB and RhB under UV light irradiation.


Author(s):  
N. M. P. Low ◽  
L. E. Brosselard

There has been considerable interest over the past several years in materials capable of converting infrared radiation to visible light by means of sequential excitation in two or more steps. Several rare-earth trifluorides (LaF3, YF3, GdF3, and LuF3) containing a small amount of other trivalent rare-earth ions (Yb3+ and Er3+, or Ho3+, or Tm3+) have been found to exhibit such phenomenon. The methods of preparation of these rare-earth fluorides in the crystalline solid form generally involve a co-precipitation process and a subsequent solid state reaction at elevated temperatures. This investigation was undertaken to examine the morphological features of both the precipitated and the thermally treated fluoride powders by both transmission and scanning electron microscopy.Rare-earth oxides of stoichiometric composition were dissolved in nitric acid and the mixed rare-earth fluoride was then coprecipitated out as fine granules by the addition of excess hydrofluoric acid. The precipitated rare-earth fluorides were washed with water, separated from the aqueous solution, and oven-dried.


Author(s):  
T. F. Kelly ◽  
P. J. Lee ◽  
E. E. Hellstrom ◽  
D. C. Larbalestier

Recently there has been much excitement over a new class of high Tc (>30 K) ceramic superconductors of the form A1-xBxCuO4-x, where A is a rare earth and B is from Group II. Unfortunately these materials have only been able to support small transport current densities 1-10 A/cm2. It is very desirable to increase these values by 2 to 3 orders of magnitude for useful high field applications. The reason for these small transport currents is as yet unknown. Evidence has, however, been presented for superconducting clusters on a 50-100 nm scale and on a 1-3 μm scale. We therefore planned a detailed TEM and STEM microanalysis study in order to see whether any evidence for the clusters could be seen.A La1.8Sr0.2Cu04 pellet was cut into 1 mm thick slices from which 3 mm discs were cut. The discs were subsequently mechanically ground to 100 μm total thickness and dimpled to 20 μm thickness at the center.


Author(s):  
G. M. Micha ◽  
L. Zhang

RENi5 (RE: rare earth) based alloys have been extensively evaluated for use as an electrode material for nickel-metal hydride batteries. A variety of alloys have been developed from the prototype intermetallic compound LaNi5. The use of mischmetal as a source of rare earth combined with transition metal and Al substitutions for Ni has caused the evolution of the alloy from a binary compound to one containing eight or more elements. This study evaluated the microstructural features of a complex commercial RENi5 based alloy using scanning and transmission electron microscopy.The alloy was evaluated in the as-cast condition. Its chemistry in at. pct. determined by bulk techniques was 12.1 La, 3.2 Ce, 1.5 Pr, 4.9 Nd, 50.2 Ni, 10.4 Co, 5.3 Mn and 2.0 Al. The as-cast material was of low strength, very brittle and contained a multitude of internal cracks. TEM foils could only be prepared by first embedding pieces of the alloy in epoxy.


1952 ◽  
Vol 44 (3) ◽  
pp. 442-442
Author(s):  
Frank Spedding ◽  
Harley Wilhelm ◽  
Wayne Keller et al
Keyword(s):  

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