The coexistence of nanoparticles (NPs) and environmental pollutants has become a new type of pollution, and the co-adsorption behaviors of coexisting NPs and pollutants on the coconut shell porous biochar is important to explore the environmental fate of both pollutants and NPs in complex environments. In this study, the interaction between nano-titanium dioxide (n-TiO₂) and tetracycline (TC) during the adsorption process on the coconut shell biochar (CBC) was explored by adsorption experiment, the co-adsorption mechanisms of TC and n-TiO₂ onto CBC were discussed by morphology and characteristics of Scanning electron microscopy, Brunauer-Emmett-Teller specific surface area, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses. The results showed that the n-TiO₂ in the TC + TiO₂ binary system leads to the TC adsorption decrease by 54.60% averagely. The TC in the TC + TiO₂ binary system increased the n-TiO₂ adsorption by 31.97% averagely but weakened the adsorption affinity of n-TiO₂. Characterization analysis confirmed that, the hydrogen bonding, π-π/n-π interaction and pore filling between TC and CBC were suppressed in the TC + TiO₂ binary system. The TC in the binary system enhances the n-TiO₂ adsorption on the outer surface and the inner surface of CBC by surface bridging and reducing the agglomeration of n-TiO₂.

纳米颗粒（NPs）与环境污染物共存已成为一种新型污染，共存的纳米颗粒与污染物在椰壳多孔生物炭上的共吸附行为对于探索复杂环境中污染物和纳米颗粒的环境归宿具有重要意义。 . 本研究通过吸附实验探讨了纳米二氧化钛（n -TiO ₂）与四环素（TC）在椰壳生物炭（CBC）的吸附过程中的相互作用、TC与n -的共吸附机理。二氧化钛₂通过扫描电子显微镜的形态和特征、Brunauer-Emmett-Teller 比表面积、傅里叶变换红外光谱和 X 射线光电子能谱分析对 CBC 上的 CBC 进行了讨论。结果表明，该Ñ -TiO ₂在TC +的TiO ₂二元体系通向TC吸附减少由54.60％平均。在TC +二氧化钛的TC ₂二元体系增加了Ñ -TiO ₂由31.97％吸附平均但减弱的吸附亲合性Ñ -TiO ₂。表征分析证实，氢键，π-π/ n在TC + TiO ₂二元体系中，TC 和CBC 之间的-π 相互作用和孔隙填充受到抑制。二元体系中的TC通过表面架桥和减少n- TiO ₂的团聚来增强CBC外表面和内表面的n- TiO ₂吸附。