Plastic debris, including microplastics, could persist in the environment for hundreds or even thousands of years due to its stability and durability (Barnes et al., 2009; Gewert et al., 2015).In addition, larger plastics in the environment would continually degrade into microplastics (Andrady, 2011; Wang et al., 2016) as a result of physical, chemical and microbial effects, resulting in an annual increase in the amount of microplastics. Thus, it is essential to understand the degradation processes of plastic particles to increase our understanding of the source of microplastics, predict the fate of microplastics in the environment, and evaluate the potential environmental hazards to organisms.