Plastic Waste Management of Packaging Materials Using Photo Catalysts

Authors

1 MSc student, Department of Food Science and Engineering, Faculty of Agriculture, University of Zanjan, Zanjan, Iran

2 Assistant professor, Department of Food Science and Engineering, University of Zanjan, Zanjan, Iran

3 Department of Chemistry, Faculty of Science, University of Zanjan, Zanjan, Iran

Abstract

Food packaging ensures long-term storage and protection of all types of food against physical, chemical and biological factors. In some food packaging, one of the purposes of packaging is to keep its contents away from oxygen and external contaminants. Today, it is an important part of the materials used to package food from petroleum products. This has caused many environmental problems. One of the proposed solutions for this issue is the use of materials with photocatalytic activity along with synthetic (petroleum) polymers. Minerals that have this property include titanium dioxide and zinc oxide. These light-sensitive materials are excited by receiving light. Hence, a hole (h*) in the valence band and an electron (e-) in the conduction band of these semiconductor compounds are created. The electron-hole pair leads to the production of active radicals which are responsible for attacking the plastic polymer chains. Consequently, changes in weight, mechanical properties, and plastic morphology are observed by realizing carbon dioxide and carbonyl groups. These changes demonstrate the decomposition of petroleum based polymers in the environment.

Keywords


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