Synthesis of CQDs/MIL-101(Cr) photocatalytic nanocomposite for degradation of RR-195

CQDs, characteristically quasispheroidal carbon nanoparticles composed of amorphous to crystalline carbon base, is a prospective semiconductor quantum dots owing to its excellent optical absorptivity, chemical stability, nontoxicity, and facile synthesis. In this study, we demonstrated the impregnation method to integrate CQDs, formed from chitosan with MIL-101(Cr) from terephthalic acid recycled by PET waste to synthesize CQDs/MIL-101(Cr) nanocomposite. After the hybridization of CQDs with MIL-101(Cr), the band gap energy of the 50% CQDs/MIL-101(Cr) has the lowest Eg (1.98 eV), allowing the demonstration of photocatalytic activity under high visible light. This material was tested in the photodegradation RR-195 dye and compared with the pristine components. The highest RR-195 degradation efficiency was recorded when using catalyst mass: 50 mg of 50% CQDs/MIL-101(Cr) catalyst samples, dye concentration: 50 ppm after 4 h under xenon lamp 300w was 96%. These results could promote a new material as a new semiconductor that can be used to protect water from further pollution.