This experimental thesis work involved the study of two different types of synthetic melanins, polydopamine (PDA-melanin) and 1,8-dihydroxynaphthalene melanin (DHN-melanin), as potential adsorbent materials for the removal of emerging contaminants from water. PDA-melanin is derived from the oxidative polymerization of dopamine, while DHN-melanin results from the oxidative polymerization of 1,8-dihydroxynaphthalene. The properties of these materials, such as their high surface area and non-toxicity, make them particularly suitable for environmental remediation applications. The analytes under investigation included a mixture of steroid hormones: estrone (E1), 17β-estradiol (E2), 17α-ethinylestradiol (EE2), progesterone (PROG), and testosterone (TST), and five fluoroquinolones: ofloxacin (OFL), ciprofloxacin (CIP), danofloxacin (DAN), enrofloxacin (ENR), and marbofloxacin (MAR). Thermodynamic and kinetic studies were conducted to evaluate the adsorption efficiency of the two materials toward these compounds. Subsequently, materials obtained through the polymerization of dopamine and 1,8-dihydroxynaphthalene on Fe₃O₄ nanoparticles were synthesized and tested, with the aim of facilitating their recovery after treatment. In this regard, preliminary studies were also conducted on membranes composed of polyacrylonitrile and PDA-melanin (PAN/PDA-melanin). Furthermore, the environmental toxicity of PDA-melanin and DHN-melanin was assessed through acute toxicity tests on Daphnia magna. Additionally, ecotoxicological tests were carried out on solutions containing the analytes (hormones and fluoroquinolones) before and after adsorption onto PDA-melanin, in order to highlight any changes in ecotoxicological properties.
Il presente lavoro di tesi sperimentale ha previsto lo studio di due diverse tipologie di melanine sintetiche, la polidopamina (PDA-melanina) e la 1,8-diidrossinaftalene-melanina (DHN-melanina), come potenziali materiali adsorbenti per la rimozione di contaminanti emergenti dalle acque. PDA-melanina deriva dalla polimerizzazione ossidativa della dopamina mentre DHN-melanina deriva dalla polimerizzazione ossidativa dell’1,8-diidrossinaftalene. Le proprietà di questi materiali, come l’elevata area superficiale e la loro atossicità, li rendono particolarmente adatti per applicazioni nel risanamento ambientale. Gli analiti presi in esame includono una miscela di ormoni steroidei: estrone (E1), 17β-estradiolo (E2), 17α-etinilestradiolo (EE2), progesterone (PROG) e testosterone (TST) e cinque fluorochinoloni: ofloxacina (OFL), ciprofloxacina (CIP) danofloxacina (DAN), enrofloxacina (ENR)e marbofloxacina (MAR). Sono stati condotti studi termodinamici e cinetici per valutare l’efficienza di adsorbimento dei due materiali nei confronti di tali composti. Successivamente sono stati sintetizzati e testati i materiali ottenuti per polimerizzazione di dopamina e 1,8-diidrossinaftalene su nanoparticelle di Fe₃O₄, allo scopo di facilitarne il recupero dopo il trattamento. A questo proposito sono stati condotti anche studi preliminari su membrane di poliacrilonitrile e PDA-melanina (PAN/PDA-melanina). È stata inoltre valutata la tossicità ambientale di PDA-melanina e DHN-melanina mediante saggi acuti su Daphnia magna. In aggiunta, sono stati eseguiti test ecotossicologici su soluzioni contenenti gli analiti (ormoni e fluorochinoloni) prima e dopo adsorbimento su PDA-melanina al fine di evidenziare eventuali variazioni nelle proprietà ecotossicologiche.
PDA-melanina e DHN-melanina: materiali adsorbenti 'eco-friendly' per la rimozione di contaminanti emergenti dalle acque
INZAGHI, YLENIA
2024/2025
Abstract
This experimental thesis work involved the study of two different types of synthetic melanins, polydopamine (PDA-melanin) and 1,8-dihydroxynaphthalene melanin (DHN-melanin), as potential adsorbent materials for the removal of emerging contaminants from water. PDA-melanin is derived from the oxidative polymerization of dopamine, while DHN-melanin results from the oxidative polymerization of 1,8-dihydroxynaphthalene. The properties of these materials, such as their high surface area and non-toxicity, make them particularly suitable for environmental remediation applications. The analytes under investigation included a mixture of steroid hormones: estrone (E1), 17β-estradiol (E2), 17α-ethinylestradiol (EE2), progesterone (PROG), and testosterone (TST), and five fluoroquinolones: ofloxacin (OFL), ciprofloxacin (CIP), danofloxacin (DAN), enrofloxacin (ENR), and marbofloxacin (MAR). Thermodynamic and kinetic studies were conducted to evaluate the adsorption efficiency of the two materials toward these compounds. Subsequently, materials obtained through the polymerization of dopamine and 1,8-dihydroxynaphthalene on Fe₃O₄ nanoparticles were synthesized and tested, with the aim of facilitating their recovery after treatment. In this regard, preliminary studies were also conducted on membranes composed of polyacrylonitrile and PDA-melanin (PAN/PDA-melanin). Furthermore, the environmental toxicity of PDA-melanin and DHN-melanin was assessed through acute toxicity tests on Daphnia magna. Additionally, ecotoxicological tests were carried out on solutions containing the analytes (hormones and fluoroquinolones) before and after adsorption onto PDA-melanin, in order to highlight any changes in ecotoxicological properties.| File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.14239/29724