College of Resources and Environment, Institute of Tropical Agriculture and Forestry, Hainan University, Renmin Road, Haikou 570228, China; Environmental and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan, China.
College of Resources and Environment, Institute of Tropical Agriculture and Forestry, Hainan University, Renmin Road, Haikou 570228, China.
Bioresour Technol. 2018 Sep;263:385-392. doi: 10.1016/j.biortech.2018.05.022. Epub 2018 May 8.
Pollution of water by single antibiotics has been investigated in depth. However, in reality, a wide range of different contaminants is often mixed in the aquatic environment (contaminant cocktail). Here, single and competitive sorption dynamics of ionizable norfloxacin (NOR), sulfamerazine (SMR) and oxytetracycline (OTC) by both pristine and modified biochars were investigated. Sorption kinetics of the three antibiotics was faster in ternary-solute than single-solute system. Sorption efficiency was enhanced in the competitive system for NOR by the pristine biochar, and for OTC by both the pristine biochar and the modified biochar, while SMR sorption by the pristine biochar and the KOH-modified biochar was inhibited. Sorption was governed by electrostatic interactions, π-π EDA and H-bonds for antibiotics sorption by biochar. SMR and OTC sorption by biochar was influenced by cation bridging and surface complexation, respectively. This research finding will guide the development of treatment procedures for water polluted by multiple antibiotics.
水体中单种抗生素的污染已得到深入研究。然而，在实际中，大量不同的污染物通常会混合在水生环境中（污染物鸡尾酒）。在这里，研究了原始和改性生物炭对可电离诺氟沙星（NOR）、磺胺甲恶唑（SMR）和土霉素（OTC）的单一和竞争吸附动力学。三种抗生素在三元溶质体系中的吸附动力学比单溶质体系更快。原始生物炭增强了 NOR 在竞争体系中的吸附效率，而原始生物炭和 KOH 改性生物炭增强了 OTC 的吸附效率，而原始生物炭和 KOH 改性生物炭则抑制了 SMR 的吸附。抗生素在生物炭上的吸附受静电相互作用、π-π EDA 和氢键的控制。SMR 和 OTC 在生物炭上的吸附分别受到阳离子桥接和表面络合的影响。这项研究结果将指导开发用于处理受多种抗生素污染的水的处理程序。
