Competitive adsorption of the herbicide fluroxypyr and tannic acid from distilled and tap water on activated carbons and their thermal desorption

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Moreno Castilla, C (Author) Other; Lopez Ramon, MV (Author) Other; Pastrana-Martínez, L.M. (Author) FEUP; Alvarez Merino, MA (Author) Other; Fontecha Camara, MA (Author) Other

Journal

Title: Adsorption

Vol. 18

Pages: 173-179

ISSN: 0929-5607

Publisher: Springer Nature

Indexing

Scopus - 5 Citations

Other information

Authenticus ID: P-00F-XG5

DOI: 10.1007/s10450-012-9391-5

Abstract (EN): A study was conducted on batch and column competitive adsorption of fluroxypyr (FLX) and tannic acid (TA) from distilled (DW) and tap water (TW) on activated carbon cloth (ACC) and granular activated carbon (GAC). Thermal desorption of the adsorbates from the spent ACC was also studied. FLX adsorption was higher from TW than from DW at low FLX equilibrium concentrations, and the inverse was observed at high FLX concentrations. The presence of TA diminished the amount of FLX adsorbed from both solvents due to partial blocking of the microporosity, but the same trends as before were observed at low and high FLX concentrations. Carbon consumption, obtained from the breakthrough curves, was lower as a function of superficial contact time with ACC than with GAC. The presence of TA increased carbon consumption, which was related to the microporosity of the adsorbents. Thermal desorption profiles of the spent ACC showed two peaks and one peak after adsorption from DW and TW, respectively. Desorption peaks shifted to higher temperatures with an increase in the heating rate, allowing the apparent activation energies and pre-exponential factors of the desorption processes to be determined. © 2012 Springer Science+Business Media, LLC.

Language: English

Type (Professor's evaluation): Scientific