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The effect of Ozonation on the chemical structure of microplastics
IOP Conference Series: Materials Science and Engineering Pub Date : 2021-09-01 , DOI: 10.1088/1757-899x/1173/1/012017
A N Fitri 1 , D Amelia 1 , E F Karamah 1
Affiliation  

Microplastics are not susceptible to microbial degradation, thus often end up in aquatic ecosystem. Moreover, microplastics cause danger to aquatic biota and human. Effective technological solutions to degrade microplastics in wastewater treatment plants are desirable. Biodegradation is one of the most applied techniques, but takes a long time. This study evaluates the ozonation as pre-treatment to transform the chemical structure of polyethylene microplastics into more susceptible to biodegradation. The process was done by using a corona-discharge ozonator and batch reactor, varied pH value (6, 7, 8, 10, 12), ozone flowrate (1, 3, 5 L/min), and contact duration (1, 2, 3 hours). The study was begun by quantification of OH radicals and dissolved ozone, ozonation of microplastics, evaluation of ozonation by gravimetric weight loss including the change of microplastics chemical structure through FT-IR (Fourier Transform Infrared). The results revealed chemical structure changes of polyethylene after ozonation confirmed by the appearance of carbonyl bonds and the loss of weight. The optimum operating condition appeared at pH 12 with 5 L/min ozone flowrate, resulted in 0.0482% weight loss and carbonyl bond intensity reached 104.556% after 3 hours ozonation.



中文翻译:

臭氧对微塑料化学结构的影响

微塑料不易被微生物降解,因此往往最终进入水生生态系统。此外,微塑料对水生生物群和人类造成危险。需要有效的技术解决方案来降解废水处理厂中的微塑料。生物降解是应用最多的技术之一,但需要很长时间。该研究评估了臭氧化作为将聚乙烯微塑料的化学结构转化为更容易生物降解的预处理。该过程通过使用电晕放电臭氧发生器和间歇式反应器、不同的 pH 值(6、7、8、10、12)、臭氧流速(1、3、5 L/min)和接触持续时间(1、2 , 3小时)。该研究开始于定量 OH 自由基和溶解的臭氧、微塑料的臭氧化、通过重量损失评估臭氧化,包括通过 FT-IR(傅立叶变换红外)改变微塑料化学结构。结果揭示了臭氧化后聚乙烯的化学结构变化,通过羰基键的出现和重量的损失来证实。最佳操作条件出现在pH 12,臭氧流速为5 L/min 时,臭氧处理3 小时后重量损失为0.0482%,羰基键强度达到104.556%。

更新日期:2021-09-01
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