Characterization of airborne trace metal and trace organic species from coal gasification

1984 ◽  
Vol 4 (4) ◽  
pp. 317-333
Author(s):  
James F. Osborn ◽  
Suresh Santhanam ◽  
Cliff I. Davidson ◽  
Richard D. Flotard ◽  
Joseph R. Stetter
Keyword(s):  
Trace Metal ◽  
Coal Gasification ◽  
Organic Species ◽  
Trace Organic

Facile Synthesis of Cu2O Nanocubes in Triblock Copolymer Solutions

2007 ◽  
Vol 121-123 ◽  
pp. 275-278
Author(s):  
Jin Hua Jiang ◽  
Qiu Ming Gao
Keyword(s):  
Triblock Copolymer ◽  
Solar Spectrum ◽  
Blue Shift ◽  
Edge Length ◽  
Promising Candidate ◽  
Organic Species ◽  
Transmission Electron ◽  
Ft Ir ◽  
Average Edge Length

Cuprous oxide and related materials in nanosizes are of much interest and investigated extensively recently. It is reported here that cubic Cu2O nanocubes were synthesized successfully in aqueous solutions at room temperature in air condition. Copper (II) salts in water were reduced with ascorbate acid in air, using the nonionic pluronic amphiphilic triblock copolymer EO20PO70EO20 (P123) as the template-directing and protecting agent. The average edge length of the cubes varied from 50 to 100 nm. Transmission electron microscopy (TEM) has been used for the shape and structural characterization of the obtained Cu2O nanocubes. The UV-Vis spectra showed an obvious blue-shift (0.53 eV), compared to the band gap of the bulk Cu2O crystal, which makes it a promising candidate in solar energy conversion since this sample can make use of higher energy visible rays of solar spectrum. In the FT-IR spectra the peak of Cu-O bond for the Cu2O is clearly distinguished and several weak peaks of the C-H, C-C and C=O bonds for the organic species can also be detectable, implying a little P123 residua in the products. The effect of the triblock copolymer P123 on the growth of the Cu2O nanocubes is discussed.

A characterization of pdms pervaporation membranes for the removal of trace organic from water

1996 ◽  
Vol 13 (5) ◽  
pp. 482-488 ◽  
Author(s):  
Choong-Kyun Yeom ◽  
James M. Dickson ◽  
Michael A. Brook
Keyword(s):  
Trace Organic

Compartment Modeling for Flow Characterization of Underground Coal Gasification Cavity

2011 ◽  
Vol 50 (1) ◽  
pp. 277-290 ◽  
Author(s):  
Sateesh Daggupati ◽  
Ramesh N. Mandapati ◽  
Sanjay M. Mahajani ◽  
Anuradda Ganesh ◽  
A. K. Pal ◽  
...  
Keyword(s):  
Coal Gasification ◽  
Underground Coal Gasification ◽  
Compartment Modeling ◽  
Flow Characterization

Design and use of a collector for the in situ isolation of particulate trace organic species in precipitation

1987 ◽  
Vol 36 (1-2) ◽  
pp. 171-192 ◽  
Author(s):  
M. A. Mazurek ◽  
B. R. T. Simoneit ◽  
L. J. Standley ◽  
D. Friedman ◽  
C. Beeman
Keyword(s):  
Organic Species ◽  
Trace Organic

scholarly journals Adsorption of Chromium(VI) Ions on to TiO2 from Aqueous Solution

1998 ◽  
Vol 16 (2) ◽  
pp. 117-126 ◽  
Author(s):  
Fu Hongxiang ◽  
Lu Gongxuan ◽  
Li Shuben
Keyword(s):  
Heavy Metal Ions ◽  
Ion Concentration ◽  
Spectroscopic Methods ◽  
Ion Adsorption ◽  
Adsorption Efficiency ◽  
Organic Species ◽  
Chromium Vi ◽  
Ft Ir ◽  
Ir Spectroscopic

The study of the adsorption of the CrVI ion on to TiO2 not only provides information on the removal of heavy metal ions from polluted aqueous solutions; but is also useful for further investigation of the photocatalytic decontamination of the CrVI ion or of CrVI–organic species which co-exist as pollutants with TiO2 when the latter is used as a stable and highly efficient photocatalyst. It has been found that dark adsorption of the CrVI ion on to TiO2 is mainly dependent on the acidity of the system and the initial concentration of the CrVI ion. As the pH of the system increases, so the extent of adsorption of the CrVI ion decreases. The greatest adsorption was obtained with an initial CrVI ion concentration of ca. 300 μmol/l. The presence of phosphate or acetate ions in the system dramatically decreases the adsorption efficiency of the CrVI ion. In contrast, the addition of formic acid leads to a limited increase in the extent of CrVI ion adsorption. Other organic ions and organic compounds examined showed no interference in CrVI ion adsorption. FT-IR spectroscopic methods were used for the characterization of CrVI ion adsorption on to TiO2.

Sign in / Sign up

Export Citation Format

Share Document