Kumaravel Sakthivel, Chandrasatheesh Chandramoorthy, Palanisamy Govindasamy, Lee Jintae, Hasan Imran, Kumaravel Saranraj, Avula Balakrishna, Pongiya Uma Devi, Balu Krishnakumar
Department of Environmental Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea.
Department of Applied Science and Technology, AC Tech, Anna University, Chennai 600025, Tamil Nadu, India.
Micromachines (Basel). 2023 Jul 20;14(7):1454. doi: 10.3390/mi14071454.
In this study, we utilized calcination and simple impregnation methods to successfully fabricate bare g-CN (GCN) and x% Ag/g-CN (x% AgGCN) composite photocatalysts with various weight percentages (x = 1, 3, 5, and 7 wt.%). The synthesized bare and composite photocatalysts were analyzed to illustrate their phase formation, functional group, morphology, and optical properties utilizing XRD, FT-IR, UV-Vis DRS, PL, FE-SEM, and the EDS. The photodegradation rate of MO under solar light irradiation was measured, and the 5% AgGCN composite photocatalyst showed higher photocatalytic activity (99%), which is very high compared to other bare and composite photocatalysts. The MO dye degradation rate constant with the 5% AgGCN photocatalyst exhibits 14.83 times better photocatalytic activity compared to the bare GCN catalyst. This photocatalyst showed good efficiency in the degradation of MO dye and demonstrated cycling stability even in the 5th successive photocatalytic reaction cycle. The higher photocatalytic activity of the 5% AgGCN composite catalyst for the degradation of MO dye is due to the interaction of Ag with GCN and the localized surface plasmon resonance (SPR) effect of Ag. The scavenger study results indicate that O radicals play a major role in MO dye degradation. A possible charge-transfer mechanism is proposed to explain the solar-light-driven photocatalyst of GCN.
在本研究中，我们采用煅烧和简单浸渍法成功制备了具有不同重量百分比（x = 1、3、5和7 wt.%）的纯g-CN（GCN）和x% Ag/g-CN（x% AgGCN）复合光催化剂。利用X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、紫外-可见漫反射光谱（UV-Vis DRS）、光致发光光谱（PL）、场发射扫描电子显微镜（FE-SEM）和能谱仪（EDS）对合成的纯光催化剂和复合光催化剂进行了分析，以阐明它们的相形成、官能团、形态和光学性质。测量了在太阳光照射下甲基橙（MO）的光降解率，5% AgGCN复合光催化剂表现出更高的光催化活性（99%），与其他纯光催化剂和复合光催化剂相比非常高。与纯GCN催化剂相比，5% AgGCN光催化剂的MO染料降解速率常数表现出高14.83倍的光催化活性。该光催化剂在MO染料降解中表现出良好的效率，并且即使在第5次连续光催化反应循环中也表现出循环稳定性。5% AgGCN复合催化剂对MO染料降解具有较高的光催化活性是由于Ag与GCN的相互作用以及Ag的局域表面等离子体共振（SPR）效应。清除剂研究结果表明，O自由基在MO染料降解中起主要作用。提出了一种可能的电荷转移机制来解释GCN的太阳光驱动光催化作用。
