Details

Autor(en) / Beteiligte

• Ayodhya, Dasari
• Veerabhadram, Guttena

Titel

Microwave-assisted fabrication of g-C3N4 nanosheets sustained Bi2S3 heterojunction composites for the catalytic reduction of 4-nitrophenol

Ist Teil von

• Environmental technology, 2021-03, Vol.42 (6), p.826-841

Ort / Verlag

Abingdon: Taylor & Francis

Erscheinungsjahr

2021

Quelle

Taylor & Francis

Beschreibungen/Notizen

• In this work, we report a stable g-C 3 N 4 , Bi 2 S 3 , and g-C 3 N 4 /Bi 2 S 3 composite catalysts were prepared via a facile one-pot microwave-assisted method and characterized. The orthorhombic phase and nearly spherical shape of the particles with an average diameter of 5-25 nm of g-C 3 N 4 /Bi 2 S 3 composite were obtained from XRD and TEM. The composite also exhibits a high surface area (32.15 m 2 /g), which may provide convenient transportation and diffusion for substrate molecule. The optical studies were displayed the g-C 3 N 4 /Bi 2 S 3 composite has a sharp absorption band in the visible region, higher charge separation, and reduced recombination rate. These results show that the Bi 2 S 3 NPs have good crystallinity and are uniformly deposited on the surface of the g-C 3 N 4 sheet. The catalytic performance of the g-C 3 N 4 /Bi 2 S 3 composite for the reduction of 4-NP to 4-AP was exhibited approximately 100%, which is 1.48 and 2.34 times higher than the Bi 2 S 3 and g-C 3 N 4 catalysts, respectively. The pseudo-first-order rate constant was estimated as 1.648 × 10  −2  min −1 for the reduction of 4-NP using g-C 3 N 4 /Bi 2 S 3 composite in 1 h reaction time. The effect of catalyst dosage (0-30 mg) was also investigated for the reduction of 4-NP using g-C 3 N 4 /Bi 2 S 3 composite catalyst. Moreover, the reusability of the g-C 3 N 4 /Bi 2 S 3 composite was exhibited a better reduction of the 4-NP even after 5 cycles and it was found that 8% reduction in the initial reduction rate. The obtained results from this study show that g-C 3 N 4 /Bi 2 S 3 composite has the potential efficiency and stability to make it an ideal catalyst for the reduction of toxic effluents and wastewater treatment.