Effect of phosphate on the adsorption of antibiotics onto iron oxide minerals: Comparison between tetracycline and ciprofloxacin

Transport of oxytetracycline through saturated porous media: role of surface chemical heterogeneity

“…Consequently, increasing solution pH values facilitated the mobility of OTC due to the enhanced electrostatic repulsion. 11,73–75 Moreover, this observation was well indicated by the trend of K d values obtained from the transport model in Table S3 †…”

“…Consequently, increasing solution pH values facilitated the mobility of OTC due to the enhanced electrostatic repulsion. 11,[73][74][75] Moreover, this observation was well indicated by the trend of K d values obtained from the transport model in Table S3. † Furthermore, the transportability of OTC through the four porous media followed the sequence of MMT-coated sand > quartz sand > HA-coated sand > Goe-coated sand over the pH range of 5.0-9.0 (Fig.…”

Transport of tetracycline in saturated porous media: combined functions of inorganic ligands and solution pH

“…In this case, more signicant electrostatic repulsion between TC À /TC 2À species and sand grains inhibited the deposition of TC to a greater extent. 38,77 Secondly, sand grains exhibited a stronger binding capacity toward phosphate than silicate and iodate under the test condition, which was conrmed by the adsorption capacity of ligands on sand grains, Table S4 †). Thus, phosphate played the most important role against TC deposition on porous media because of the greatest competitive deposition effects as mentioned earlier.…”

“…37 In addition, phosphate also can inuence the adsorption and transport behavior of antibiotic contaminants (e.g., tetracyclines) in aquifer media such as sand, soil and sediment. [38][39][40] It is worth noting that the physicochemical properties of different inorganic ligands vary in chemical structure, molecular size, and dissociation coefficients. 41 Thus, different types of inorganic ligands may inuence the interactions between environmental media and contaminants.…”

“…32 Note that solution pH values are also likely to affect the mobility properties of TC with inorganic ligands because the charging behaviors of inorganic ligands and TC molecules are highly pHdependent. 35,37,38 Nevertheless, to date, little is known about the combined effects of typical inorganic ligands and solution pH values on mobility characteristics of TC in subsurface environments. Hence, a more comprehensive study is required to test and reveal the different transport behaviors of TC through groundwater systems containing various inorganic ligands.…”