论文部分内容阅读
磺胺二甲基嘧啶作为普遍使用的抗生素代表,可通过动物粪便施肥及药物不规范使用进入到环境中.针铁矿是土壤中分布广泛且活性较高的一种矿物,会对磺胺二甲基嘧啶的环境行为产生一定的影响.为了正确评估磺胺二甲基嘧啶的环境风险,本文考察了溶液pH值、离子强度对针铁矿吸附磺胺二甲基嘧啶的影响.结果表明:磺胺二甲基嘧啶在针铁矿上的吸附具有明显的非线性,且吸附具有明显的滞后现象,吸附等温线可以用Freundlich模型较好的拟合(R~2=0.991);磺胺二甲基嘧啶在针铁矿上的吸附随着pH值的增加先增加后减小,随着离子强度的增加开始有微弱的增加然后保持不变;在酸性和中性条件下,表面络合作用是主导磺胺二甲基嘧啶在针铁矿表面上吸附的主要机制,在碱性条件下静电斥力是主导吸附的主要作用力.因此,在评估抗生素的环境行为时,应该考虑不同的环境条件对针铁矿吸附磺胺二甲基嘧啶的影响.
Sulfadimethoxine, as a commonly used antibiotic, can enter the environment through animal manure fertilization and non-standard use of drugs. Goethite is a widely distributed and highly active mineral in the soil that affects sulfamethazine Pyrimidine environmental behavior.In order to correctly assess the environmental risk of sulfamethazine, this paper investigated the pH value of the solution, the ionic strength of goethite adsorbed sulfamethazine.Results showed that: sulfamethazine The adsorption of pyrimidine on goethite is obviously non-linear, and the adsorption has obvious hysteresis. The adsorption isotherm can be well fitted by Freundlich model (R ~ 2 = 0.991); sulfamethazine The adsorption on the ore increases first and then decreases with the increase of pH, and then increases slightly with the increase of ionic strength and then remains unchanged. Under acidic and neutral conditions, the surface complexation is dominated by sulfadimethin The main mechanism of adsorption of pyrimidine on the surface of goethite is that the electrostatic repulsion is the main force that dominates the adsorption under basic conditions.Therefore, in assessing the environmental behavior of antibiotics, different environmental conditions should be considered Effect of adsorption sulfamethazine goethite.