| Antibiotics usually coexisted with other organic pollutants in long-term manure irrigated farm soil, which lead to the complicated transportation and transformation behaviors and ecological effects of these chemicals in the environment. Batch shock adsorption equilibrium method was used to investigate the adsorption properties of phenanthrene on clay mineral accompanied with tylosin. The results showed that tylosin exhibited strong adsorption capacity on montmorillonite, and the adsorption capacity could reach 250 mg·g-1. Tylosin could enter the interlayer of montmorillonite and increase the interlayer space from 1.17 nm to 1.28 nm. The sorption of phenanthrene on the montmorillonite was enhanced by preadsorbed tylosin, when the initial concentration of tylosin increased from 0 to 100 mg·L-1. The adsorption capacity coefficient lgKf ranging from -4.047 to 0.591, lgKf was positively correlated with the organic carbon content in mineral, which might be due to the preadsorbed tylosin that could act as “soil organic matters”. The adsorption capacity and nonlinearity of phenanthrene on montmorillonite increased with the initial concentration of tylosin, indicating that the hydrophobic interaction between tylosin and phenanthrene might play a major role in phenanthrene adsorption on organic minerals. It should be considered the synergic adsorption of co-contaminants to assess the risk of antibiotic drugs and hydrophobic organic compound pollution in the environment. |
