Green Synthesis of a Metal‐Free 0D/2D Heterojunction: A Cost‐Effective Approach

Abstract

Photocatalyst derived from 0D/2D heterojunction composite is highly attractive for their great potential in environmental remediation and energy conversion. Herein we constructed a 0D/2D heterojunction built from carbon quantum dots (CD) and carbon nitride sheets (GCN) by microwave irradiation, which ensures the uniform dispersion of CDs. The electric field generated at the interface of this heterojunction favored the prevention of rapid recombination of photogenerated charge carriers. The successful heterojunction formation is due to the uniform dispersion of CDs, acting as electron sink over the sheets. A four‐fold enhancement in photocatalytic activity is obtained for this heterojunction, compared to pristine carbon nitride. With the support of the scavenger studies, the possible mechanism behind the photocatalytic activity is proposed. Interestingly, herewith we report an eco‐friendly method for the synthesis of CD/GCN composite material by using cheaply available and non‐hazardous precursors such as urea and glucose.

Polymeric Carbon Nitride/Iron Oxide Composites: A Novel Class of Catalysts with Reduced Metal Content for Ammonium Perchlorate Thermal Decomposition

“…19 The strong bands in the region of 1200−1620 cm −1 , with peaks at 1231, 1319, 1398, 1446, 1550, and 1613 cm −1 , were assigned to the stretching modes of the sp 3 C−N bond and sp 2 C�N heterocycles. 29,31 In addition to this, the broad band in the region of 3000−3500 cm −1 was attributed to the presence of primary and secondary amines in carbon nitride sheets. 32,33 The characteristic peaks of gCN and pore size distribution confirms the presence of mesopores in samples gCN, GF1, and GF2, whereas the presence of micropores in GF3 and iron oxide.…”

“…For gCN, an intense peak at 806 cm –1 was attributed to the breathing mode of tri- s -triazine units . The strong bands in the region of 1200–1620 cm –1 , with peaks at 1231, 1319, 1398, 1446, 1550, and 1613 cm –1 , were assigned to the stretching modes of the sp 3 C–N bond and sp 2 CN heterocycles. , In addition to this, the broad band in the region of 3000–3500 cm –1 was attributed to the presence of primary and secondary amines in carbon nitride sheets. , The characteristic peaks of gCN and Fe 2 O 3 were retained in all of the gCN/Fe 2 O 3 composites, confirming the formation of composites.…”

“…When compared to pure gCN, after coupling with Fe 2 O 3 , the sharp peak of gCN at 27.2° shows a small shift to a high 2θ value (Figure b) as the concentration of the dopant increases. This kind of XRD peak shift to a higher angle and peak broadening implies the effective host–guest interaction and reduction in stacking distance between layered structures . This sort of guest–host interaction existing in the composites might contribute to their better catalytic efficiency toward the thermal decomposition of AP.…”

“…This kind of XRD peak shift to a higher angle and peak broadening implies the effective host–guest interaction 28 and reduction in stacking distance between layered structures. 29 This sort of guest–host interaction existing in the composites might contribute to their better catalytic efficiency toward the thermal decomposition of AP. From Figure 2 b, we can see that the peak shift is maximum in the case of GF2 compared to GF1 and GF3.…”

Carbon Nitride Quantum Dot-Embedded Poly(vinyl alcohol) Transparent Thin Films for Greenish-Yellow Light-Emitting Diodes

“…Thus, the need to develop metal-free quantum dots is very important. Various research groups have contributed to develop quantum dots such as carbon quantum dots, , graphene quantum dots, and CN-QDs . Among these quantum dots, CN-QDs exhibit higher-photoluminescence (PL) quantum yield, , which makes them better candidates as photocatalysts and biosensors .…”