Abstract: This study addresses microplastics as an emerging environmental concern. Initially, microscopic examination revealed the release of plastic particles from disposable paper cups upon hot water exposure, visually demonstrating microplastic contamination risks. Employing kitchen waste-derived crab shells as a primary material, we developed an optimized household experiment with a dual-purpose strategy: fabricating porous crab shells via acid-base treatment for nanoplastic adsorption, and synthesizing carbon quantum dots through pyrolysis for nanoplastic quantification. This “adsorption-detection” experimental framework advances microplastic awareness from basic recognition to property investigation and remediation practice, thereby enriching science communication. The experiment’s waste solution was repurposed as plant nutrient solution, embodying green chemistry principles. Beginning with commonplace hot water-paper cup interactions, our approach makes invisible microplastics tangible, overcoming public perception barriers. The crab shell methodology not only enhances interactive learning but also demonstrates innovative applications for studying aged microplastic properties. Through tiered science communication, this work effectively promotes environmental consciousness and supports plastic pollution mitigation efforts.

Key words: Microplastics, Microscope, Crab shell utilization, Home experiment, Gradient science popularization