Interaction of coexisting nanoparticles (NPs) and other pollutants may affect their behavior in the environment. In this study, we investigated the effects of TiO₂ NPs on the adsorption and desorption of tetracycline (TC) by magnetized kaolin (MK). The interactions among TC, TiO₂ NPs, and MK were then discussed through their morphology and characteristics by using scanning electron microscopy, X-ray energy dispersive spectrometry, Transmission electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy analyses. Results showed that TiO₂ NPs increased TC adsorption on MK by 2.02% and increased TC desorption by 45.26%, TC increased the maximum adsorption of TiO₂ on MK from 31.32 to 49.42 mg g⁻¹ and decreased the amount of stable adsorption state TiO₂ NPs on MK from 17.92 to 12.71 mg g⁻¹. The characterization results demonstrated that TC molecules combined on MK though hydrogen bonding, π-π bonding and hydrophobic interaction. The adsorption of TiO₂ NPs on MK can provide additional hydrogen-bonding sites for TC adsorption by increasing the number of hydroxyl groups. However, TC can decrease the electrostatic attraction sites for TiO₂ NPs adsorption on the MK surface. The complexation of TC and TiO₂ NPs weakened the electrical attraction between MK and TiO₂ NPs and decreased the amount of stable adsorption state TiO₂ NPs.

共存的纳米颗粒（NPs）与其他污染物的相互作用可能会影响其在环境中的行为。在这项研究中，我们研究了TiO ₂ NPs对磁化高岭土（MK）对四环素（TC）的吸附和解吸的影响。然后，通过扫描电子显微镜，X射线能量色散谱，透射电子显微镜，X射线衍射，X射线光电子能谱和傅里叶变换，通过形态和特性来讨论TC，TiO ₂ NP和MK之间的相互作用。红外光谱分析。结果表明，TiO ₂ NPs使MK上的TC吸附增加2.02％，TC解吸增加45.26％，TC增加TiO ₂的最大吸附MK的稳定吸附态TiO ₂ NPs的量从31.32降低到49.42 mg g ^-1，稳定态的TiO ₂ NPs从17.92降低到12.71 mg g ^-1。表征结果表明，TC分子通过氢键，π-π键和疏水相互作用在MK上结合。TiO ₂ NPs在MK上的吸附可通过增加羟基数为TC吸附提供额外的氢键位。但是，TC可以减少TiO ₂ NPs吸附在MK表面上的静电吸引位。TC和TiO ₂ NPs的络合作用减弱了MK和TiO ₂ NPs之间的电吸引力，并减少了稳定吸附态TiO的量_2个NP。