土霉素在寒地黑土不同组分的吸附

The Adsorption Behavior of Different Components of Oxytetracycline in Cold Black Soil

土霉素(Oxytetracycline,OTC)属于四环素类抗生素,由于人类生产生活的使用而进入环境。土壤环境中的土霉素可能通过不同作用力与土壤相互作用,而影响其在土壤中的迁移转化,影响其对生物的毒性,进而对土壤生态环境造成严重危害。因此研究抗生素在土壤中的环境行为,可以为土壤环境抗生素的治理提供理论支持。以土霉素为吸附质,寒地黑土为吸附剂,研究土霉素在寒地黑土不同组分上的吸附行为,同时分析pH值变化对寒地黑土吸附土霉素的影响,探究其对土霉素的吸附机理。结果表明:在实验条件下,土霉素在寒地黑土不同组分吸附更符合Langmuir模型,多层吸附与单层吸附共存,以单层吸附为主;去有机质土壤对土霉素吸附能力最强;pH值对去有机质土影响最大,主要机理为静电作用、架桥作用。

Oxytetracycline(OTC)belonged to the tetracycline class of antibiotics,which entered the environment due to the use of human production and life.Oxytetracycline in the soil environment may affect its migration and transformation in the soil through different forces interacting with the soil,affecting its toxicity to organisms,and then causing serious harm to the soil ecological environment.Therefore,studied the environmental behavior of antibiotics in the soil can provide theoretical support for the treatment of soil environmental antibiotics.Using oxytetracycline as adsorbent and cold black soil as adsorbent,the adsorption behavior of oxytetracycline on different components of cold black soil was studied,and the effect of pH change on the adsorption of oxytetracycline in cold black soil was analyzed,and the adsorption mechanism of oxytetracycline was explored.The results show that under experimental conditions,the adsorption of different components of oxytetracycline in cold black soil is more in line with the Langmuir model,and multilayer adsorption and monolayer adsorption coexist,with monolayer adsorption as the mainstay;Soils that remove organic matter have the strongest adsorption capacity for oxytetracycline;The pH value has the greatest influence on the remove organic soil,the main mechanism is electrostatic action and bridging effect.