Spectroscopy and Spectral Analysis, Volume. 41, Issue 2, 517(2021)
Photocatalytic Degradation of RhB Dye by Copolymerization Modification g-C3N4-N Under Visible Light
The discharge of dye wastewater has become a serious threat to human health and the ecosystem. Photocatalytic technology has shown attractive potential in eliminating environmental pollution problems owing to its simple operation and environment-friendly. Graphite-like phase carbon nitride (g-C3N4) was considered to be one of the most promising photocatalysts for its low cost and high chemical stability in the field of photocatalysis. However, poor specific surface area, limited optical absorption and high charge carrier recombination rate restricted its photocatalytic efficiency. Thus, a novel graphitic carbon nitride(g-C3N4-N) photocatalyst was synthesized by thermos-induced copolymerization modification method using urea and o-Aminobenzontrile, and its effect on photocatalytic degradation ability of RhB was evaluated based on solution pH value, g-C3N4-N dosage, and RhB concentration. In addition, both the photocatalytic degradation mechanism of RhB and its degradation path by g-C3N4-N were also analyzed through XRD, BET, UV-Vis in this research. The results showed that g-C3N4-N synthesized using copolymerization modification method was pure graphite-like phase g-C3N4-N, with the stable performance of a photocatalytic activity, large specific surface area and porous structure. Under visible light conditions, the photocatalytic degradation efficiency of RhB was found to be optimal with initial pH of 3, RhB concentration of 10 mg·L-1 and g-C3N4-N dosage of 50 mg, and the adsorption removal rate of RhB was achieved 30% within 30 minutes in dark reaction. Besides, its photocatalytic degradation removal rate of 120 minutes reach 97.7%. Under the catalysis of visible light, RhB molecules adsorbed on the surface of the g-C3N4-N was firstly degraded into macromolecular intermediates such as DER, EER and AR through rapid N-de-ethylation process, then base on redox reaction of holes, ·OH and ·
Get Citation
Copy Citation Text
Xue XIA, Yun-xia PAN, Meng-zhu LI. Photocatalytic Degradation of RhB Dye by Copolymerization Modification g-C3N4-N Under Visible Light[J]. Spectroscopy and Spectral Analysis, 2021, 41(2): 517
Category: Research Articles
Received: Sep. 16, 2020
Accepted: Nov. 9, 2020
Published Online: Apr. 8, 2021
The Author Email: