title: Effect of solution properties, competing ligands, and complexing metal on sorption of tetracyclines on Al-based drinking water treatment residuals.
abstract: In the current batch study, we investigated the effect of solution properties, competing ligands (phosphate (P(V)) and sulfate), and complexing metal (calcium (Ca(2+))) on tetracycline (TTC) and oxytetracycline (OTC) sorption by Al-based drinking water treatment residuals (Al-WTR). The sorption behavior for both TTC and OTC on Al-WTR was pH dependent. The sorption in absence of competing ligands and complexing metal increased with increasing pH up to circum-neutral pH and then decreased at higher pH. The presence of P(V) when added simultaneously had a significant negative effect (p < 0.001) on the sorption of TTC and OTC adsorbed by Al-WTR at higher TTC/OTC:P ratios. However, when P(V) was added after the equilibration of TTC and OTC by Al-WTR, the effect was minimal and insignificant (p > 0.1). The presence of sulfate had a minimal/negligible effect on the sorption of TCs by Al-WTR. A significant negative effect (p < 0.001) on the adsorption of TCs by Al-WTR was observed in the pH range below 5 and at higher TCs:Ca(2+) ratios, probably due to TCs-Ca(2+) complex formation. Fourier transform infrared (FTIR) analysis indicated the possibility of inner-sphere-type bonding by the functional groups of OTC/TTC on Al-WTR surface. Results from the batch sorption study indicate high affinity of Al-WTR for TCs in the pH range 4-8 (majorly encountered pH in the environment) in the presence of competing ligands and complexing metal.
authors: Department of Earth and Environmental Studies, Montclair State University, One Normal Avenue, Montclair, NJ, 07043, USA.
authors: Pravin
authors: P
authors: Punamiya
authors: Dibyendu
authors: D
authors: Sarkar
authors: Sudipta
authors: S
authors: Rakshit
authors: Rupali
authors: R
authors: Datta
mesh_terms: D000327:Adsorption; D000900:Anti-Bacterial Agents / Q000737:chemistry*; D060766:Drinking Water / Q000737:chemistry*; D004350:Drug Residues / Q000737:chemistry*; D008024:Ligands; D008670:Metals / Q000737:chemistry*; D010118:Oxytetracycline / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry; D013752:Tetracycline / Q000737:chemistry*; D014877:Water Pollution, Chemical; D018508:Water Purification / Q000379:methods*
chemical_list: D000900:Anti-Bacterial Agents; D060766:Drinking Water; D008024:Ligands; D008670:Metals; D010710:Phosphates; D012996:Solutions; D013431:Sulfates; D013752:Tetracycline; D010118:Oxytetracycline
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