Removal of polyester fibre microplastics from wastewater using a UV/H2O2 oxidation process
Removal of polyester fibre microplastics from wastewater using a UV/H2O2 oxidation process
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DOI：
10.1016/j.jece.2022.109057
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发表时间：
2022-11
影响因子：
7.7
通讯作者：
T. Easton;V. Koutsos;E. Chatzisymeon
中科院分区：
文献类型：
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作者：
T. Easton;V. Koutsos;E. Chatzisymeon
由于目前缺乏合适的去除技术，来自洗衣废水的塑料微纤维大量释放到环境中。高级氧化工艺可以提供一个有希望的选择，以减轻这个问题，因为它们能够破坏有机污染物，而不是将它们转移到其他形式。在这项研究中，紫外线照射和过氧化氢处理对微塑料（MP）的去除效果进行了测定。MP的质量损失，羰基指数（CI）的变化，其表面上的物理变化，其特征在于傅立叶变换红外光谱，扫描电子显微镜和原子力显微镜进行了监测。此外，监测水的化学需氧量（COD），以检查MP中可溶性有机物质的释放和降解。研究了不同UVC剂量和H_2O_2浓度对细胞增殖的影响。在4.0 mW cm-2UVC照射下，500 mg L-1H 2 O2的剂量在48 h后导致52.7%的质量损失（计算的半衰期为45.3 h）。此外，还观察到，纤维的降解通过在其表面上形成浅孔、凹坑和裂纹以及含氧官能团的相对丰度的变化而发生。这种化学变化证明了处理的MP，这是增加了高达10.6%相比，未经处理的纤维的CI。UVC/H2 O2处理真实的医院洗衣废水基质，分别在9 h和3 h内降解15.2%的MP和完全去除COD。
Plastic microfibres originating from laundry wastewater are released in significant numbers to the environment due to a current lack of suitable removal technology. Advanced oxidation processes could offer a promising option to mitigate the problem due to their ability to destruct organic pollutants rather than transferring them to other forms. In this study, the effect of UV irradiation and hydrogen peroxide treatment on the removal of microplastics (MPs) was determined. MPs mass loss, carbonyl index (CI) change, and physical changes on their surface, as characterised by Fourier transform infra-red spectroscopy, scanning electron microscopy and atomic force microscopy were monitored. Additionally, the chemical oxygen demand (COD) of the water was monitored to examine the release and degradation of soluble organic material from MPs. The effect of varied UVC dose and H2O2concentration was investigated. A dose of 500 mg L-1H2O2under 4.0 mW cm-2UVC irradiation resulted in mass loss of 52.7% after 48 h (with a calculated half life of 45.3 h). Also, it was observed that degradation of fibres occurred through the formation of shallow holes, pits and cracks across their surface as well as changes in the relative abundance of oxygen containing functional groups. This chemical change was evidenced by the CI of treated MPs, which was increased up to 10.6% compared to untreated fibres. Moreover, the proposed UVC/H2O2treatment could degrade 15.2% MPs and completely remove COD in real hospital laundry wastewater matrix within 9 h and 3 h of treatment, respectively.