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سنتز، مشخصه یابی و کاربرد مواد فوق آبگریز برای حذف میکروپلاستیک ها و مطالعه رفتار جذب و انتقال هیدروکربن های آروماتیک چندحلقه ای بر سطح میکروپلاستیک ها در منابع آبی
طاوسی شیرازی، دلارام سادات Tavoussi Shirazi, Delaram Sadat
Synthesis, Characterization, and Application of Superhydrophobic Materials for the Removal of Microplastics and the Study of Adsorption and Transport Behavior of Polycyclic Aromatic Hydrocarbons on Microplastic Surfaces in Water Resources
Tavoussi Shirazi, Delaram Sadat | 2026
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- Type of Document: Ph.D. Dissertation
- Language: Farsi
- Document No: 58908 (03)
- University: Sharif University of Technology
- Department: Chemistry
- Advisor(s): Bagheri, Habib
- Abstract:
- The main objective of this dissertation is to understand and control the risks posed by microplastics in aquatic environments and human health. These studies investigate the mechanism of contaminant adsorption and desorption by virgin and aged microplastics under various conditions, demonstrating that these microplastics act as carriers for contaminant transfer. Subsequently, the research focuses on developing a sustainable and multifunctional sorbent based on a POSS-modified sponge, aiming to simultaneously adsorb microplastics and hydrophobic contaminants from aquatic environments, thereby mitigating environmental and health impacts. In the first research work, separate studies on the adsorption and separation of non-polar Polycyclic Aromatic Hydrocarbons (PAHs) from polystyrene (PS), polyvinyl chloride (PVC), and polymethyl methacrylate (PMMA) microplastics showed that PS adsorbs larger amounts of PAHs due to its rougher surface, pores, and aromatic configuration. The adsorption of PAHs followed pseudo-second-order kinetics and the Freundlich isotherm. The aging process using K2S2O8had differential effects on the adsorption across the polymers. The desorption rate of PAHs was highest in the simulated gastric fluid medium (FaSSGF), indicating the risk of contaminant transfer by both virgin and aged microplastics in aquatic and gastrointestinal environments. In the second work, aluorine-free platform based on Polyhedral OligomericSilsesquioxane (POSS) was successfully synthesized via UV-light-induced thiol-ene click reaction without any initiator. This modified platform, incorporating SH-POSS and OV-POSS, created a sponge with extremely strong and stable superhydrophobicity, enhanced stability, and dual adsorption capability for oils and microplastics. The modified material exhibited a highly cross-linked porous structure and extreme surface hydrophobicity (water contact angle of 153∘). Kinetic and isotherm analyses indicated that adsorption follows pseudo-second-order kinetics and best fits the Freundlich isotherm (indicating multilayer adsorption on heterogeneous surfaces). This POSS-modified sponge rapidly adsorbed about 90% of microplastics from the aqueous suspension and maintained its high efficiency even after several reuse cycles. Furthermore, it demonstrated excellent adsorption capacity for oils and organic solvents (up to 89 g g−1) and retained its efficiency after 9 adsorption–desorption cycles for removing microplastics and 12 cycles for adsorbing organic solvents.
- Keywords:
- Microplastics ; Polyhedral Oligomeric Silsesquioxanes (POSSs) ; Polynuclear Aromatic Hydrocarbons (PAHs) ; Oil Absorbtion ; Adsorption/Desorption Process ; Aged Microplastics ; Microplastics Removal ; Superhydrophobic Sponge
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