Green and Facile Synthesis of Luminescent CQDs from Pomegranate Peels and its Utilization in the Degradation of Azure B and Amido Black 10B by Decorating it on CuO Nanorods

Abstract

Green fluorescent water-soluble carbon quantum dots (CQDs) of size 6 nm were fabricated by carbonization of pomegranate (Punica granatum) peels at a mild temperature of 160°C for 12 h. The CuO NRs were prepared by the precipitation method. The formation of CQDs and CuO nanorods (NRs) was confirmed. The chemical composition and morphological features of CQD, CuO, and composite (CuO/CQDs) are characterized by XRD, FESEM, HRTEM, FTIR, EDX, XPS, and BET. XRD and TEM analysis shows the amorphous nature of CQDs and the monoclinic nature of CuO NRs. The CuO NRs decorated with CQDs have given the maximum photocatalytic activity for the degradation of Azure B (97 %) and Amido black 10 B (94 %) than CuO NRs alone. Several water quality parameters have been measured before and after degradation. Hence bio-based luminescent CQDs with a high yield were synthesized for the first time through a greener route.

Ultrasound-assisted pseudohomogeneous tungstate catalyst for selective oxidation of alcohols to aldehydes

“…As can be seen, in XRD patterns related to A-CQDs and A-CQDs/W, both samples show the typical broad peak related to amorphous carbonaceous compounds without any other distinct peak which confirms the formation of amorphous structure of CQDs core. As is shown characteristic peak corresponds to amorphous carbon network in A-CQDs displayed at about 21.25°, which after substitution tungstate ions with chlorine ones in A-CQDs/W, this peak slightly broadened and shifted toward higher angle and appeared at about 24.70 33 – 35 .…”

Enhanced Electrochemical Performance of CuO Capsules@CDs Composites for Solid-State Hybrid Supercapacitor

“…Among the metal oxides, copper oxide is central to the performance of supercapacitors, photocatalysis, photoelectrochemical water splitting, and sensing applications . The copper oxide nanomaterial has multiple oxidation states, high electronic conductivity, electroactivity, and attractive morphologies such as nanorods, nanosheets, nanoflowers, and nanoneedles. − With a capacitance of up to 1800 Fg –1 , compared to 2200 Fg –1 of hydrated RuO 2 , CuO has become a material of choice for developing supercapacitor devices with enhanced performance .…”

Revolutionizing fuel production through biologically synthesized zero-dimensional nanoparticles

“…4 Nanomaterials have gained signicant attention in the catalytic degradation of various organic contaminants due to their superior stability, improved efficacy, and larger surface area for reaction. 5,6 Metal chalcogenide nanostructures have gained popularity among researchers due to their unique electronic properties. 7,8 Metal chalcogenides have been proven to exhibit high activity in degrading dyes in just a few hours.…”

“…Additionally, CQDs exhibit up-down photoluminescence (PL) conversion and the ability to accept and donate electrons. 34–36 Some studies have employed CQDs as one of their composite materials to prepare CQDs/CuS, 37 Fe 2 O 3 /CQDs, 38 CQDs/CuO, 5 CQDs/ZnO, 39 CQD/TiO 2 , 40,41 CQDs/Sb 2 WO 6 (ref. 42) and CQD/PCN (polymeric carbon nitride).…”