Microplastic (MP) contamination in water has garnered significantly global concerns. The MP removal particularly challenges when the particle size decreases to several microns and other contaminants co-exist. This study used the coagulative colloidal gas aphrons (CCGAs) to simultaneously remove the micron-scale MP particles (~5µm in diameter) and dissolved organic matter (DOM). Carboxyl-modified poly-(methyl methacrylate) (PMMA) and unsurface-coated polystyrene (PS) were chosen as target MPs. Over 94% of PS particles and almost 100% of color were simultaneously removed with lower CCGA consumption than the scenarios with either contaminant in water. The PMMA removal was not as high as the PS removal since the HA polyanions could compete with the negatively-charged PMMA for CCGAs. High salinity reduced the removal of HA by changing its interfacial behaviors without impacting the MP separation. In river water or influent of wastewater treatment plant, the MP particles were almost completely eliminated whereas the DOM (tyrosine-like or tryptophan-like) was partially removed. The fluorescence quenching titration revealed that CCGAs preferably captured the free DOM and the DOM-coated MP particles through complexation interaction. The study denoted that the CCGA system could be a robust tool for efficiently and synergistically removing micron-scale MPs and DOM from different water matrixes.

水中的微塑料（MP）污染已引起全球广泛关注。当粒径减小到几微米并且其他污染物共存时，MP的去除尤其具有挑战性。这项研究使用凝结的胶体气态氩气（CCGA）同时去除了微米级的MP颗粒（直径约5μm）和溶解的有机物（DOM）。选择羧基改性的聚（甲基丙烯酸甲酯）（PMMA）和未表面涂覆的聚苯乙烯（PS）作为目标MP。与在水中有任何污染物的情况相比，同时以CCGA消耗量更低的方式同时去除了超过94％的PS颗粒和几乎100％的颜色。由于HA聚阴离子可以与带负电荷的PMMA竞争CCGA，因此PMMA的去除不如PS去除。高盐度通过改变HA的界面行为而减少了HA的去除，而不会影响MP的分离。在河水或废水处理厂的进水中，MP颗粒几乎被完全清除，而DOM（酪氨酸样或色氨酸样）被部分去除。荧光猝灭滴定表明，CCGA优选通过络合相互作用捕获游离的DOM和DOM包被的MP颗粒。研究表明，CCGA系统可能是一种强大的工具，可以有效，协同地从不同的水基质中去除微米级的MP和DOM。荧光猝灭滴定表明，CCGA优选通过络合相互作用捕获游离的DOM和DOM包被的MP颗粒。研究表明，CCGA系统可能是一种强大的工具，可以有效，协同地从不同的水基质中去除微米级的MP和DOM。荧光猝灭滴定表明，CCGA优选通过络合相互作用捕获游离的DOM和DOM包被的MP颗粒。研究表明，CCGA系统可能是一种强大的工具，可以有效，协同地从不同的水基质中去除微米级的MP和DOM。