Boosting the photocatalytic efficiency of g-C3N4 for effective removal of RhB and MB from aqueous medium

Mohamed Masri , Girisha K. B , Abdo Hezam , Khaled Alkanad , Talal F. Qahtan , Qasem A. Drmosh , Faten Masri , Kalappa Prashantha , Manjunath S. H , Sanaa Mohammed Abdu Kaid , Udayabhanu , K. Byrappa
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Abstract

Due to the adverse consequences the presence of dyes in the aquatic system poses on the ecosystem and human health, a major body of research has been dedicated to tackle the issue of degrading such contaminants. The utilization of sustainable energy technology, namely photocatalysis, in the removal of such contaminants proved to achieve relatively positive advances in the field of water treatment. The present study employed the combustion method for the synthesis of graphitic carbon nitride (g-C3N4). Diverse characterization studies were employed, including XRD, SEM, and FTIR to confirm the successful fabrication of g-C3N4. Results showed that the band gap was 2.67 eV with 473 nm adsorption of visible light, and appropriate positions of valence and conduction bands. This renders the prepared material a suitable one to be employed as a visible-light-responsive catalyst for the degradation of Rhodamine B (RhB) and Methylene Blue (MB). Results demonstrated that the removal of RhB (90 %) was slightly better than that of MB (87 %) within 150 min under visible light. The optimal degradation performance reached 95 % at catalyst dosage of 0.02 and 0.03 g/L for RhB and MB, respectively. The current research work advocates the potential of improving the morphology of g-C3N4 through a two-step heating process for the purpose of optimizing this catalyst to attain better photocatalytic performance regarding contaminant degradation.
提高g-C3N4光催化效率,有效去除水中介质中的RhB和MB
由于染料在水生系统中的存在对生态系统和人类健康造成的不良后果,一个主要的研究机构一直致力于解决降解这些污染物的问题。利用可持续能源技术,即光催化,去除这种污染物,证明在水处理领域取得了相对积极的进展。本研究采用燃烧法制备石墨化氮化碳(g-C3N4)。通过XRD、SEM和FTIR等多种表征研究,证实了g-C3N4的成功制备。结果表明,该带隙为2.67 eV,对可见光的吸附为473 nm,价带和导带位置合适。这使得所制备的材料适合用作罗丹明B (RhB)和亚甲基蓝(MB)降解的可见光响应催化剂。结果表明,在可见光作用下,150 min内RhB(90 %)的去除率略好于MB(87 %)。催化剂用量为0.02和0.03 g/L时,对RhB和MB的最佳降解率为95 %。目前的研究工作提倡通过两步加热工艺改善g-C3N4的形貌,以优化该催化剂,使其在污染物降解方面获得更好的光催化性能。
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