Brij30/β-FeOOH/GO复合材料的可控构筑及其对盐酸四环素吸附性能

Rational construction and adsorption properties of Brij30/βracycline hydrochloride-FeOOH/GO composite for tet

抗生素滥用已经成为全世界面临的公共卫生问题,去除环境中残留的抗生素刻不容缓。采用聚氧乙烯月桂醚(Brij30)对β-FeOOH进行表面改性,辅助水热法制备Brij30/β-FeOOH/GO复合材料。通过X-射线粉末衍射仪(XRD)、透射电子显微镜(TEM)、X-射线光电子能谱仪(XPS)、红外光谱仪(FT-IR)和Zeta电位对其组成及微观结构表征。考察了吸附剂投加量、溶液的pH值和共存离子对盐酸四环素(TCH)吸附性能的影响,研究了吸附机理。结果表明,在优化反应条件(Brij30/β-FeOOH/GO投加量0.01 g、溶液pH=5、吸附10 h、TCH初始浓度40 mg/L)下,吸附量达65.97 mg/g,吸附行为符合伪二级动力学方程和Freundlich吸附等温线模型,属于化学吸附并存的多分子层吸附。存在的吸附机理为π-π键堆积、氢键结合、螯合作用和电荷转移。

The antibiotic resistance caused by misuse of the consequences has become a public health problem.It is urgent to remove these antibiotics before they enter into water cycling system.FeOOH,a functional material with great development potential,requires further development in the treatment of antibiotic wastewater.Graphene oxide(GO)has been widely employed in wastewater treatment due to its unique physical and chemical properties and has achieved certain effects.In this work,polyoxyl lauryl ether(Brij30)was employed to modify the surface ofβ-FeOOH,and Brij30/β-FeOOH/GO was prepared via hydrothermal method.The composition and microstructures of the as-prepared samples were studied by X-ray powder diffractometer,transmission electron microscope,X-ray photoelectron spectrometer,infrared spectrometer and Zeta potential.In order to determine the optimum adsorption conditions,the adsorption performance was explored on account of the adsorbent dosage,p H value and coexisting ions.And the adsorption mechanism of tetracycline hydrochloride was investigated.The experimental results demonstrated that structure-controlled tetracycline hydrochloride adsorption.The optimal adsorption conditions were observed at adsorbent of0.01 g,solution p H of 5,adsorption time of 10 h,initial concentration of tetracycline hydrochloride of 40 mg/L.And the adsorption capacity of tetracycline hydrochloride reached up to 65.97 mg/g.The experimental results of adsorption thermal kinetics indicated that the adsorption behavior conform to the pseudo-second-order model and Freundlich isotherm model,its belonged to the multilayer molecular layer adsorption,which was the coexistence of chemical adsorption.The adsorption mechanism of tetracycline hydrochloride was driven by electrostatic interactions between tetracycline hydrochloride and unsaturated Fe sites.Theπ-πinteractions(tetracycline hydrochloride benzene ring and theβ-FeOOH’s ligand)and pore fillings play an important role in the removal of tetracycline hydrochloride.The results obtained will help to understand surface interactions between Brij30/β-FeOOH/GO and tetracycline hydrochloride and fabricate efficientβ-FeOOH-based adsorbents in environment purification.