College of Materials Science and Engineering, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, Nanshan District Key Laboratory for Biopolymers and Safety Evaluation, Shenzhen University, Shenzhen, 518055, PR China; Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, PR China.
School of Chemistry, Shoolini University, 173229, Solan, Himachal Pradesh, India.
J Hazard Mater. 2019 Feb 15;364:429-440. doi: 10.1016/j.jhazmat.2018.10.060. Epub 2018 Oct 22.
Metallic Ag deposited BiPO/BiOBr/BiFeO ternary nano-hetero-structures were rationally designed and synthesized by a simple precipitation-wet impregnation-photo deposition method. The plasmonic junction possesses an excellent wide spectrum photo-response and makes best use of BiPO which is otherwise a poor photocatalyst. Ag@BiPO/BiOBr/BiFeO showed superior photocatalytic activity for degradation of norfloxacin (NFN) under visible, ultra-violet, near-infra-red and natural solar light. Especially catalyst APBF-3 (0.3 wt% Ag@BiPO/BiOBr/BiFeO) shows 98.1% degradation of NFN (20 mg/L) in 90 min under visible light and 99.1% in less than 45 min under UV exposure. Free radical scavenging experiments and electron spin resonance (ESR) results has been used for explanation of charge transfer, photocatalytic mechanism and role of radicals for binary, ternary and Ag deposited ternary junctions for UV and visible exposure. Metallic Ag in addition to its surface plasmon resonance helps in protection of high conduction band and valence band in the three semiconductors. A dual Z-scheme mechanism has been predicted by comparing with possibilities of double charge and vectorial charge transfer.
采用简单的沉淀-湿浸渍-光沉积法，合理设计并合成了负载金属 Ag 的 BiPO/BiOBr/BiFeO 三元纳米异质结构。等离子体结具有优异的宽光谱光响应，充分利用了 otherwise 作为一种不良光催化剂的 BiPO。Ag@BiPO/BiOBr/BiFeO 在可见光、紫外光、近红外光和自然光下对诺氟沙星（NFN）的降解表现出优异的光催化活性。特别是催化剂 APBF-3（0.3wt%Ag@BiPO/BiOBr/BiFeO）在可见光下 90min 内对 NFN（20mg/L）的降解率达到 98.1%，在紫外光下不到 45min 降解率达到 99.1%。通过自由基捕获实验和电子自旋共振（ESR）结果，解释了电荷转移、光催化机制以及二元、三元和负载 Ag 的三元结在 UV 和可见光照射下自由基的作用。金属 Ag 除了表面等离子体共振外，还有助于保护三种半导体中的高导带和价带。通过与双电荷和矢量电荷转移的可能性进行比较，预测了双 Z 方案机制。
