| dc.description.abstract | The rapid development of the textile industry sector is an environmental problem that causes pollution by liquid dye waste such as methylene blue (MB) dye. Therefore, effective efforts are needed to reduce MB levels, namely by photodegradation. Photodegradation can be done using ZnO and ZnO/N-CDs nanocomposites. The addition of N-CDs aims to increase the photocatalytic activity of ZnO through the addition of functional groups from N-CDs. The stages carried out are the synthesis of N-CDs from EDA-doped tamarind seeds and the synthesis of ZnO/N-CDs nanocomposites using the hydrothermal method. Then, the photodegradation test of MB using ZnO/N-CDs nanocomposite under UV radiation with variation of irradiation time of 0, 30, 60, 90, and 120 minutes and photodegradation test of MB using ZnO and N-CDs with optimum time obtained from photodegradation using ZnO/N-CDs nanocomposite. Characterization was conducted on photocatalyst material and MB after photodegradation. The results showed that N-CDs had been successfully synthesized which was characterized by blue luminescence under 365 nm UV lamp, spherical shape with an average particle diameter size of 4,4 nm, absorbance of 324 nm and emission of 475 nm. The synthesized ZnO/N-CDs nanocomposite produced an average particle size of 47,87 nm, absorbance and emission of 410 nm and 561 nm, respectively. The results of photodegradation analysis showed that the optimum time was 90 minutes with % MB degradation on N-CDs, ZnO, and ZnO/N-CDs nanocomposite of 56,6%, 83,2%, and 98%. This proves that the ZnO/N-CDs nanocomposite photocatalyst can be a photodegradation material for MB. | en_US |
