Abstract: The research aimed to study the degradation effect of carbon black, activated carbon, graphene oxide and multi-walled carbon nanotubes on sodium alginate solution. Employing the GPC and rotation viscometer, the changes of degradation rate of SA/carbon material complex solutions were analyzed firstly and based on those results, degradation kinetics of SA complex solutions were investigated. It was found that among these carbon materials, the effect of anti-degradation was GO>CB>AC>MWCNTs. The degradation rate constants was kSA>kSA/MWCNTs>kSA/AC>kSA/CB>kSA/GO. Anti-degradation effect of SA/carbon material solutions were characterized by FTIR, XRD and SEM. The results indicated that no new covalent bond formed，but H-bond existed between SA and carbon materials. The crystalline region of SA film after UV irradiation was slightly decreased, but graphene oxide/SA complex film was notably enhanced. The neat SA film exhibited cracking while SA/carbon complex film didn’t after UV irradiation. To summarize, carbon materials as degradation agents have advantages of simple technology and easy operation.

Key words: sodium alginaatae, carbon black, graphene oxide, multi-walled carbon nanotubes, degradation mechanism