Recycling Polyethylene into High‐Value Porous Carbon Composites for Microwave Absorption

The recycling of solid plastic waste has been a major challenge to the sustainable development of today's society. Herein, one of the commonly wasted plastic raw materials, linear low‐density polyethylene (LLDPE), is used as the carbon source to explore high‐value porous carbon composites for microwave absorption applications. The carbon composites are simply obtained through the delicate carbonization of LLDPE, followed by in situ introducing Ni nanoparticles (NPs) into the carbon monolith. The porous carbon composites show a minimum reflection loss (RL_min) value of −52.2 dB at 1.65 mm, which demonstrates excellent microwave absorption properties of the wasted plastic‐derived carbon materials. In addition, the anticorrosion performance of the carbon composites is evaluated by electrochemical technique. Above all, the current study provides a new idea and simple strategy for processing wasted plastics to high‐value porous carbon materials.