原生及風化之微型塑膠對環境中防曬乳吸附行為探討之研究

Sorption Behaviors of Virgin and Aged Microparticles as Potential Vector for UV Filter in the Environment

韓志翰(Jihan Nabilah Hanun)

指導教授 ： 江政傑

中原大學/工學院/環境工程學系/碩士(2022年)

https://doi.org/10.6840/cycu202200088

摘要

環境中形成微型塑膠的來源主要由塑膠物質經過高溫降解之過程，而這些微型 塑膠也因為粒徑小，表面積大，能吸附較多的污染物於表面上，進而對環境以及人體造成危害。本研究主要目的為探討不同風化作用對微型塑膠所造成特性改變之影響，包含將微型塑膠放置空氣中、鹹水與淡水中，直接於太陽光下暴露 3 個月，以及利用氙燈模擬太陽光連續照射 24 小時等。此外，並藉由等溫吸附實驗與動力吸
附實驗探討微型塑膠 oxybenzone 化合物(防曬乳成分之一)之吸附行為。本研究所使用的微型塑膠為 3 種不同特性之聚對苯二甲酸乙二酯 (polyethylene terephthalate, PET)、針對其用途可分為用於礦泉水之寶特瓶(HEF-14)、果汁的寶特瓶(HEF-36)、碳酸飲料之寶特瓶(HEF-18)。 FTIR 分析結果發現微型塑膠表面有羥基與羧基的吸收波峰產生，顯示出受到氧化過程之降解作用，而 BET 分析結果也指出相較於原生的微型塑膠，經過風化作用後之微型塑膠有較多獨特的表面積產生。動力吸附與等溫吸附實驗結果顯示出本研究之 PET 吸附模式符合偽二階模式；原生微型塑膠主要以 Langmuir 為主要之等溫吸附模式，而風化後之微型塑膠則符合 Freundlich 等溫吸附模式。另外本研究也發現外在環境因子也會影響其吸附過程，且疏水效應與氫鍵之產生為 PET 對 oxybenzone 化合物之主要吸附機制。

關鍵字

微型塑膠 ； 聚對苯二甲酸乙二酯 ； 防曬乳 ； oxybenzone ； 風化 ； 吸附

並列摘要

Degradation process by plastic items has been known to form microplastic particles due to the exposure of high-intensity radiation. This phenomenon can harm the environment as well as humans because its small size results in a large specific surface area, thereby increasing the ability to adsorb contaminants. This study aims to investigate the influence of aging treatment performed by 3 months of sun exposures as well as 24 hours of Xenon light exposures on the changes of microplastic characteristics. The aging treatments were implemented with air-, seawater-, and natural water-environments to ensure the simulation portrayed the typical actual environments. In addition, kinetics and isotherms experiments were conducted to identify the sorption behavior of the UV filter represented by the oxybenzone compound onto microplastic particles. The microplastics used in this study were poly(ethylene terephthalate) (PET). PET material was grouped into 3 types, which were commercially applied for water mineral bottles (HEF-14), juice bottles (HEF-36), and carbonated drinks bottles (HEF-18). FTIR analysis revealed that microplastics were degraded by going through an oxidation process which is characterized by the appearance of absorbance peaks in carboxyl and hydroxyl groups. The BET analysis showed the number of specific surface areas generated by aged microplastics, while virgin microplastics exhibited undetected values. The kinetics sorption results were consistent with the pseudosecond-order model. The isotherms sorption revealed that the Langmuir model was suitable in representing virgin microplastics sorption behavior, while the Freundlich model was appropriately describing the sorption behavior of aged microplastics. The external factor of analytes also affected the sorption mechanism. Hydrophobic interaction and hydrogen bonding formation were assumed to be the primary mechanisms on the sorption of oxybenzone towards the PET microplastics.

並列關鍵字

Microplastics ； PET ； UV filter ； oxybenzone ； aging ； sorption

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