Cu2+ in wastewater is hazardous to human health, and adsorption technology can effectively remove heavy metal ions. In this study, sulfhydryl graphene oxide/chitosan/ε-polylysine (SGCS-E) polymeric antimicrobial materials were prepared using 3D printing technology. These materials were characterized using scanning electron microscopy, Fourier transform infrared spectroscopy, and XPS. The effects of temperature and other influencing factors on the adsorption performance were systematically investigated. The adsorption process followed pseudo-second-order kinetics and the Langmuir model. The maximum adsorption capacity of the adsorbent was 313 mg/g at an initial Cu2+ concentration of 20 mg/L, pH 5, and a temperature of 303.15 K. The study on the adsorption mechanism showed that the adsorption of Cu2+ by SGCS-E was mainly controlled by chemical interactions. Antibacterial experiments showed that SGCS-E has a good growth inhibition effect on E. coli and S. aureus. The antibacterial process of SGCS-E is mainly achieved by interfering with the synthesis of proteins and DNA in bacterial cells. Therefore, SGCS-E can not only adsorb and remove Cu2+ from wastewater but also inhibit the overgrowth of microorganisms in the porous adsorbent and improve its reusability, making it a dual-functional adsorbent-antibacterial material with high stability.
Keywords: 3D printing; Adsorption; Antibacterial; Chitosan; Graphene oxide.
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