College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, PR China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, PR China; Key Lab of Nutrition and Agro-environment in Northwest China, Ministry of Agriculture, Yangling, 712100, PR China.
Chemosphere. 2021 Jan;263:128106. doi: 10.1016/j.chemosphere.2020.128106. Epub 2020 Sep 1.
Interaction of coexisting nanoparticles (NPs) and other pollutants may affect their behavior in the environment. In this study, we investigated the effects of TiO NPs on the adsorption and desorption of tetracycline (TC) by magnetized kaolin (MK). The interactions among TC, TiO 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 TiO NPs increased TC adsorption on MK by 2.02% and increased TC desorption by 45.26%, TC increased the maximum adsorption of TiO on MK from 31.32 to 49.42 mg g and decreased the amount of stable adsorption state TiO NPs on MK from 17.92 to 12.71 mg g. The characterization results demonstrated that TC molecules combined on MK though hydrogen bonding, π-π bonding and hydrophobic interaction. The adsorption of TiO 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 TiO NPs adsorption on the MK surface. The complexation of TC and TiO NPs weakened the electrical attraction between MK and TiO NPs and decreased the amount of stable adsorption state TiO NPs.
共存纳米颗粒（NPs）和其他污染物的相互作用可能会影响它们在环境中的行为。在这项研究中，我们研究了 TiO NPs 对磁化高岭土（MK）吸附和解吸四环素（TC）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红外光谱分析，讨论了 TC、TiO NPs 和 MK 之间的相互作用。结果表明，TiO NPs 使 TC 在 MK 上的吸附增加了 2.02%，解吸增加了 45.26%，TC 使 TiO 在 MK 上的最大吸附量从 31.32 增加到 49.42 mg/g，使 MK 上稳定吸附态 TiO NPs 的量从 17.92 减少到 12.71 mg/g。表征结果表明，TC 分子通过氢键、π-π 键合和疏水相互作用结合在 MK 上。TiO NPs 在 MK 上的吸附可以通过增加羟基的数量为 TC 的吸附提供额外的氢键结合位点。然而，TC 可以减少 TiO NPs 在 MK 表面吸附的静电吸引位点。TC 和 TiO NPs 的络合作用削弱了 MK 和 TiO NPs 之间的电吸引力，减少了稳定吸附态 TiO NPs 的数量。
