College of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, 113001, China.
College of Petrochemical Engineering, Liaoning Petrochemical University, Fushun, 113001, China.
Chemosphere. 2021 Dec;284:131342. doi: 10.1016/j.chemosphere.2021.131342. Epub 2021 Jun 29.
Tetracycline antibiotics as the emerging pollutants had been drawn abroad increasing concerns. An agricultural waste, the lignocellulosic hazelnut shell, was used as the carbon source to prepare the nanocomposites of zero-valent iron@biochar by pyrolytic reduction method at 1123 K for 2 h in N atmosphere. The adsorptive removal of tetracycline, oxytetracycline and chlortetracycline by the zero-valent iron@biochar from aqueous solution was investigated by batch method. The optimal experimental conditions were found to be at pH 6-7 with a contact time of 40 min. The adsorbed amounts of oxytetracycline, chlortetracycline and tetracycline at 298 K were 52.7, 42.5 and 39.1 mg g, respectively. Adsorption process of three antibiotics by the nanocomposite pursued Langmuir and pseudo-second-order equations. Thermodynamic parameters illustrated that the adsorption was spontaneous and endothermic intrinsically. The high removal efficiencies up to 95% of the zero-valent iron@biochar for oxytetracycline and chlortetracycline from the culture wastewaters had opened the potential applications for the removal of the antibiotics.
四环素类抗生素作为新兴污染物已引起国际广泛关注。榛子壳是一种农业废弃物，我们用它作为碳源，通过在氮气气氛中于 1123 K 下热解还原 2 h 的方法制备零价铁@生物炭纳米复合材料。通过批量实验的方法研究了零价铁@生物炭从水溶液中对四环素、土霉素和金霉素的吸附去除作用。实验发现，最佳实验条件为 pH 值 6-7，接触时间为 40 min。在 298 K 时，土霉素、金霉素和四环素的吸附量分别为 52.7、42.5 和 39.1 mg/g。该纳米复合材料对三种抗生素的吸附过程符合 Langmuir 和拟二级动力学方程。热力学参数表明，吸附过程本质上是自发的和吸热的。该纳米复合材料对来自培养液的土霉素和金霉素的去除率高达 95%，这为去除抗生素开辟了潜在的应用前景。
