二氧化钛 NPs 和 OTC 在娄土不同粒径成分上的凝聚行为和机理

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2024-11-26 DOI:10.1016/j.colsurfa.2024.135841

Leming Zhen , Zhaofu Meng , Qiyuan Qin , Wenhui Liu , Na Sun , Jingbing Xue , Jialong Lv

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引用次数: 0

摘要

抗生素和纳米粒子的广泛应用使其在土壤中的共存成为一个新的环境问题，多种污染物在土壤中的共存可能会影响其环境行为。本研究通过差速离心法将土壤分为粗颗粒（CP）和细颗粒（FP）两相，选择土霉素（OTC）和二氧化钛纳米颗粒（NPs）作为两种典型污染物，研究它们在娄底土壤中的共吸附行为。利用扫描电镜、X射线衍射、BET比表面、XPS和傅立叶变换红外光谱分析了OTC和TiO2纳米粒子的形态和特征，探讨了它们在娄底土壤上的共吸附机理。OTC 在 FP 相上的吸附容量远大于在 CP 相上的吸附容量。氢键和电荷吸引是 OTC 在 CP 相和 FP 相上的主要吸附机制。π-π相互作用是 OTC 在 FP 相上的另一种主要吸附机制。氢键和电荷吸引是二氧化钛纳米粒子在土壤上吸附的主要机制。OTC 和 TiO2 NPs 通过电荷吸引和氢键作用在土壤颗粒表面竞争，从而抑制了它们的吸附。

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Coadsorption behaviour and mechanism of TiO2 NPs and OTC on different size particle components of Lou soil

The wide application of antibiotics and nanoparticles has made their coexistence in soil a new environmental problem, and the coexistence of multiple pollutants in soil may impact their environmental behaviour. In this study, by dividing soil into coarse particle (CP) and fine particle (FP) phases via differential centrifugation, oxytetracycline (OTC) and TiO₂ nanoparticles (NPs) were selected as two typical pollutants to study their coadsorption behaviour on Lou soil. The coadsorption mechanism of OTC and TiO₂ NPs on Lou soil was discussed through their morphology and characteristics by using SEM, XRD, BET specific surface, XPS and FT-IR analyses. The adsorption capacity of OTC on the FP phase was much greater than that on the CP phase. Hydrogen bonding and charge attraction are the main adsorption mechanisms of OTC on both the CP and FP phases. π-π interactions are another main adsorption mechanism of OTC sorption on the FP phase. Hydrogen bonding and charge attraction are the main mechanisms of TiO₂ NPs sorption on soil. OTC and TiO₂ NPs compete on the surface of soil particles through charge attraction and hydrogen bonding, thus inhibiting their adsorption.

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.