Electrospun Cellulose Acetate/Chitosan Fibers for Humic Acid Removal: Construction Guided by Intermolecular Interaction Study

2021 ◽  
Author(s):  
Yirong Zhang ◽  
Fen Wang ◽  
Yixiang Wang
Keyword(s):  
Humic Acid ◽  
Cellulose Acetate ◽  
Intermolecular Interaction ◽  
Interaction Study

scholarly journals Hg-Pb binary heavy metals interaction study with Humic Acid: monitoring by FTIR spectroscopy

2020 ◽  
Vol 10 (2) ◽  
pp. 121
Author(s):  
Mohamed Cherif Terkhi ◽  
Mouffok Redouane Ghezzar ◽  
Ahmed Addou
Keyword(s):  
Humic Acid ◽  
Humic Acids ◽  
Binary Solution ◽  
Binary Interaction ◽  
Vibration Band ◽  
Interaction Study ◽  
High Concentration ◽  
Analytical Technique ◽  
Stretching Vibration ◽  
Leonardite Humic Acid

<p>This work shows that infrared spectroscopy is an easy and fast analytical technique for monitoring the behavior of the humic acids Fluka and Leonardite in contact with binary solutions of mercury and lead. Given the complexity of the structure of humic acid, the experiments were carried out on simple model molecules.<strong></strong></p><p>The spectra showed a shift (30 cm<sup>-1</sup>) of the antisymmetric stretching vibration band from the carboxylate function -COO<sup>-</sup> from 1590 to 1560 cm<sup>-1</sup> for the humic acids Fluka-binary solution interaction. In the case of mercury alone, the shift was of 40 cm<sup>-1</sup>, it can be seen that this shift has dropped by 10cm<sup>-1</sup>, which proves that the cationic exchange becomes more difficult.<strong></strong></p><p>We have confirmed that the affinity is due to the ionic radius, the reduction potential and the ionic potential. We reinforced this by a fourth parameter which is the frequency separations between the-COO<sup>-</sup> antisymmetric and symmetric stretches (Dn<sub>as-s</sub>). We have found thatDn<sub>as-s </sub>is strongly related to the type of fixed metal. The spectra also showed the variation of the intensity of the C=O elongation vibration band of the carboxylic function -COOH up to 1610 cm<sup>-1</sup> for the Leonardite humic acid-binary interaction. The high concentration of the binary solution did not result in the total disappearance of the C=O band as in the Leonardite humic acid-mercury alone interaction study. This proves that some carboxylic sites are not accessible to Hg<sup>2+</sup> ions.</p>

scholarly journals Effect of water compounds on photo-disinfection efficacy of TiO2 NP-embedded cellulose acetate film in natural water

2020 ◽  
Author(s):  
Jing Xie ◽  
Yen-Con Hung
Keyword(s):  
Humic Acid ◽  
Cellulose Acetate ◽  
Natural Water ◽  
Water Hardness ◽  
Prediction Equation ◽  
Water Disinfection ◽  
Kaolin Clay ◽  
E Coli ◽  
Cellulose Acetate Film ◽  
Effect Of Water

Abstract Photocatalysis disinfection has great potential for irrigation water disinfection to improve fresh produce safety. Titanium dioxide (TiO2) nanoparticle (NP)-embedded cellulose acetate (CA) film has shown effectiveness against Escherichia coli (E. coli) O157:H7 in water. The current study evaluated the effect of natural water compounds on the photo-disinfection efficacy of TiO2 NP-embedded CA film. Humic acid, calcium carbonate (CaCO3), and kaolin clay solutions were prepared at four concentrations, respectively. When concentration increased from 0 to 20 ml/L, inactivation of E. coli O157:H7 in humic acid, CaCO3, and kaolin clay solutions decreased from 6 log to 5, 4, and 2 log CFU/ml, respectively after 3 h treatment. Turbidity, UVT-254, water hardness, total suspended solids (TSS), and total organic carbon (TOC) of the solutions were measured. UVT-254 and turbidity had the highest correlation with the inhibition effect of water compounds on photo-disinfection efficacy. A prediction equation was developed with UVT-254 and water hardness as independent variables to predict photo-disinfection efficacy in natural water. E. coli O157:H7 decreased by 1 and 2.5 log CFU/ml in unfiltered and filtered natural creek water samples after treatment. The results from this study showed promise in the use of TiO2 NP-embedded CA film to inactivate pathogens in natural water.

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