Synthesis of novel Starch/zeolitic imidazolate framework (ZIF-67)/Graphene oxide biocomposite and photocatalytic dye degradation ability

Water pollution is one of the problems that must be solved quickly. Synthetic dyes are known as one of the main organic contaminant groups in water that have a bad effect on human and aquatic life. Herein, Starch/Zeolitic imidazolate framework (ZIF-67)/Graphene oxide biocomposites (SZ67GO) were synthesized with various starch values (0.5, 1 and 1.5 g denoted as SZ67GO-0.5, SZ67GO-1 and SZ67GO-1.5, respectively). The synthesized materials were characterized and used for the degradation of Acid Blue 92 (AB92) in the presence of LED visible light. The effect of catalyst dosage, contaminant concentration, and pH on AB92 degradation was studied. The AB92 removal using visible light was 4% for Starch, 24% for GO, 40% for ZIF-67, and 75–86.4 % for Starch/ZIF-67/GO composites. SZ67GO-1 biocomposite showed the highest degradation ability. The AB92 degradation efficiency using 0, 2, 4, 6, and 8 mg of SZ67GO-1 biocomposite are 1, 20, 52, 67.3, and 86.4%, respectively. The kinetics of decolorization by SZ67GO-1 biocomposite followed the zero-order. The reusability of SZ67GO-1 biocomposite for 3 cycles of AB92 degradation was above 82% (cycle 1: 86.4%, cycle 2: 84%, and cycle 3: 82%)