1D-2D Ag nanowire/g-C 3 N 4 hybrid obtained via a post-mechanical-mixing route for photocatalytic Rhodamine B degradatio
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1D‑2D Ag nanowire/g‑C3N4 hybrid obtained via a post‑mechanical‑mixing route for photocatalytic Rhodamine B degradation Lin Lei1 · Weijia Wang1 · Wenjie Yu1 · Chao Wang1 · Huiqing Fan1 Received: 11 May 2020 / Accepted: 1 August 2020 © Springer Nature B.V. 2020
Abstract The photocatalytic degradation of Rhodamine B (Rh B) wastewater using Ag/gC3N4 composites has aroused great interests. To date, the composite is dominated by Ag nanoparticles (AgNPs) on the g-C3N4 surface. Only a few studies have concentrated on 1D Ag nanowires (AgNWs) wrapped with g-C3N4 which could bring some new aspects. The wrapped structures can provide large interface, which promotes the exciton dissociation. Moreover, AgNWs with high conductivity can facilitate a fast charge transfer from g-C3N4 and therefore suppress the charge recombination. Herein, a facile approach via a post-mechanical-mixing route has been used to fabricate 1D-2D AgNWs/g-C3N4 composites with enhanced photocatalytic activity for Rh B degradation. AgNWs staggered arrangement can form a conductive network for fast charge transfer. The light absorption of the hybrid in the visible-light region is increased due to the light-scattering from 1D AgNWs. Moreover, conformal contact between AgNWs and g-C3N4 promotes the separation of photo-induced electron-hole pairs. The AgNWs/g-C3N4 hybrid for 2 wt% achieves the best photocatalytic activity for Rh B dye degradation. This work reports an idea using 1D–2D metal-organic hybrid materials as photocatalysts and proposes a facile post-mechanical-mixing method for fabricating hybrids toward various applications. Keywords g-C3N4 · AgNWs · Photocatalysis · Water purification
* Weijia Wang [email protected] Huiqing Fan [email protected] 1
State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
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Introduction To alleviate the growing demands for energy and to address environmental issues, the development of green and sustainable technologies is critical [1–5]. Thus, tremendous efforts are made to remove contaminants in polluted air and wastewater via a low-cost, easy-handling, and environmentally friendly route. Among the current methodologies, photocatalysis is regarded as a promising approach and shows great potential in mitigating environmental pollution using solar energy [6–11]. Graphitic carbon nitride (g-C3N4), a conjugated polymeric photocatalyst, has displayed important applications in solar energy conversion, and environmental remediation due to its suitable band structure, excellent chemical and physical stability, and earth abundance [12, 13]. Nevertheless, there are several unfavorable issues for g-C3N4 such as limited response to visible light, low electric conductivity, the high recombination rate of photogenerated carriers, which are detrimental to the photocatalytic efficiency [14, 15]. The introduction of nanometals with specific structures in a photocatalytic system can not on
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