This research consists of four experimental sections. Part one includes the synthesis of sulfonated graphene oxide with SiO 2 and TiO 2 coating used for the effective removal of Ni, Cd, Pb and Zn ions. These adsorbents were characterized by the FTIR, TGA, BET, XRD, XPS and CHNS techniques. The second part of this thesis is focused on the preparation of the MACFF (magnetically activated carbon fiber felt), an adsorbent designed for the removal of cephalexin and amoxicillin. The interactions of antibiotic with the surface of MACFF was also studied by the XPS. XPS data fit very well with the tendency of antibiotics with MACFF as an adsorbent. This adsorbent was characterized by the FTIR, BET, XRD, XPS, RAMAN as well as magnetization test. The third part is about the synthesis of the hematite coated with TiO 2 applicable to the study of budesonide release. Budesonide is a drug suitable for the treatment of inflammatory bowel disease. FTIR, BET, XRD, TGA, and magnetization test were applied for this medicinal composite. The fourth part is about the synthesizing chitosan/ WST composite designed for the oral delivery of insulin. It is a matter of great interest to design an oral delivery system for insulin to replace the harsh injection method used for the delivery of insulin as an effective medication for the delivery of insulin. The structure of chitosan/ WST composite was studied by the FTIR, FESEM, BET, Swelling test and erosion test. Fluorescence bioimaging was used to analyze the degradation behavior of chitosan/ WST composite inside the mouse body. Elisa test was also conducted to calculate the amount of insulin-loaded on the chitosan/ WST composite.
