Isotherm and kinetic studies on the adsorption of humic acid molecular size fractions onto clay minerals

2019 ◽  
Vol 38 (6) ◽  
pp. 863-871 ◽  
Author(s):  
Mohamed E. A. El-Sayed ◽  
Moustafa M. R. Khalaf ◽  
James A. Rice
Keyword(s):  
Humic Acid ◽  
Clay Minerals ◽  
Molecular Size ◽  
Kinetic Studies ◽  
Size Fractions

Evaluation of photocatalytic degradation of a commercial humic acid in water using a simulated solar UV irradiation and monitoring the changes by size exclusion chromatography

2011 ◽  
Vol 11 (6) ◽  
pp. 692-698 ◽  
Author(s):  
S. Valencia ◽  
J. Marín ◽  
G. Restrepo ◽  
F. H. Frimmel
Keyword(s):  
Humic Acid ◽  
Photocatalytic Degradation ◽  
Size Exclusion Chromatography ◽  
Uv Irradiation ◽  
Molecular Size ◽  
Size Exclusion ◽  
Size Fractions ◽  
Preferential Adsorption ◽  
Exclusion Chromatography ◽  
Solar Uv

Much research has been undertaken on the photocatalytic degradation of humic substances with titanium dioxide using commercial humic acids (HA), which are extracts from either peat or coal. Most of the research has been focused on the changes in dissolved organic carbon (DOC) and UV254 absorption. These parameters only give a general assessment. This work studies the changes in the physical and structural properties of a commercial humic acid by size exclusion chromatography with DOC and UV254 absorption detection (SEC-DOC, SEC-UV254), and the evolution of halogenated organic compounds (AOX) and trihalomethanes (THMs) during the photocatalytic degradation with simulated solar UV irradiation and Degussa P-25 TiO2. These changes are compared with those reported for natural organic matter (NOM). The photodegradation of commercial HA and NOM proceeds in a similar and sequential manner, initially with the preferential adsorption of larger molecules, then the degradation of these larger molecular size fractions and proceeding towards smaller molecular size fractions, while decreasing THMs and AOX formation potential.

The effect of photocatalytic oxidation on molecular size distribution profiles of humic acid

2015 ◽  
Vol 14 (3) ◽  
pp. 576-582 ◽  
Author(s):  
M. Bekbolet ◽  
S. Sen-Kavurmaci
Keyword(s):  
Humic Acid ◽  
Size Distribution ◽  
Photocatalytic Oxidation ◽  
Molecular Size ◽  
Drastic Change ◽  
Size Fractions ◽  
Excitation Emission Matrix ◽  
Molecular Size Distribution ◽  
Eem Fluorescence

Photocatalytic oxidation leads to a drastic change in excitation emission matrix (EEM) fluorescence features of humic acid molecular size fractions.

Fluorescence properties of the <5kDa molecular size fractions of a soil humic acid

Geoderma ◽  
2011 ◽  
Vol 163 (1-2) ◽  
pp. 24-29 ◽  
Author(s):  
Claire Richard ◽  
Christian Coelho ◽  
Ghislain Guyot ◽  
Lubov Shaloiko ◽  
Oleg Trubetskoj ◽  
...  
Keyword(s):  
Humic Acid ◽  
Molecular Size ◽  
Fluorescence Properties ◽  
Size Fractions ◽  
Soil Humic Acid

Effects of a humic acid and its size-fractions on the bacterial community of soil rhizosphere under maize (Zea mays L.)

Chemosphere ◽  
2009 ◽  
Vol 77 (6) ◽  
pp. 829-837 ◽  
Author(s):  
Edoardo Puglisi ◽  
George Fragoulis ◽  
Patrizia Ricciuti ◽  
Fabrizio Cappa ◽  
Riccardo Spaccini ◽  
...  
Keyword(s):  
Zea Mays ◽  
Humic Acid ◽  
Bacterial Community ◽  
Zea Mays L ◽  
Size Fractions ◽  
Soil Rhizosphere

Adsorption of soil-derived humic acid by seven clay minerals: A systematic study

2016 ◽  
Vol 64 (5) ◽  
pp. 628-638 ◽  
Author(s):  
RebeccaA. Chotzen ◽  
Tamara Polubesova ◽  
Benny Chefetz ◽  
YaelG. Mishael
Keyword(s):  
Humic Acid ◽  
Clay Minerals ◽  
Systematic Study

scholarly journals Binding of proton and iron to lignite humic acid size-fractions in aqueous matrix

2018 ◽  
Vol 254 ◽  
pp. 241-247 ◽  
Author(s):  
Zinnat A. Begum ◽  
Ismail M.M. Rahman ◽  
Yousuke Tate ◽  
Toshiharu Ichijo ◽  
Hiroshi Hasegawa
Keyword(s):  
Humic Acid ◽  
Size Fractions ◽  
Lignite Humic Acid
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