Silver deposited titanate nanotube array composite (Ag/TNA-c) was successfully synthesized using tea leaves and ground coffee as reducing agent for the first time. The synthesis method was effective, eco-friendly, and reproducible in producing quality nano-composite. The Ag/TNA composite was characterized via XPS, SEM, UV–vis, XRD, and electrochemical analyses for chemical and physical properties. Additionally, chlorogenic acid, caffeine, and catechin were selected as reducing agents for purpose of comparison. Results indicated that catechin and chlorogenic acid were the main reducing agents responsible for Ag⁺ reduction in tea leaves and ground coffee, respectively. The synthesized Ag/TNA-c exhibited the best photocatalytic (PC) performance in terms of photo-current response, EIS, Ibuprofen degradation, and hydrogen generation in a PEC system. Pairing with a Pt cathode, the photoelectrochemical (PEC) system using the synthesized Ag/TNA composite photo-anode, was capable of concurrent anodic oxidation of Ibuprofen and cathodic generation of hydrogen. Deposition of nano-Ag particles on TNA enhanced the concurrent oxidation and reduction reaction in the PEC system. Results of ESR analysis confirmed the role of hydroxyl radical on Ibuprofen degradation over Ag/TNA-c in the PEC system. Mechanism of Ag/TNA PEC system was proposed to illustrate the oxidation and reduction reaction.

首次以茶叶和咖啡粉为还原剂成功合成了银沉积的钛酸酯纳米管阵列复合材料（Ag / TNA-c）。该合成方法有效，环保，可重复生产高质量的纳米复合材料。Ag / TNA复合材料通过XPS，SEM，UV-vis，XRD和电化学分析对化学和物理性质进行表征。另外，出于比较的目的，选择绿原酸，咖啡因和儿茶素作为还原剂。结果表明，儿茶素和绿原酸是造成Ag ⁺的主要还原剂。分别减少茶叶和咖啡粉。合成的Ag / TNA-c在光电流响应，EIS，布洛芬降解和PEC系统中的氢气产生方面表现出最佳的光催化（PC）性能。与Pt阴极配对，使用合成的Ag / TNA复合光阳极的光电化学（PEC）系统能够同时进行布洛芬的阳极氧化和氢的阴极生成。在TNA上沉积纳米Ag颗粒可增强PEC系统中同时发生的氧化和还原反应。ESR分析的结果证实了PEC体系中羟基自由基对布洛芬的降解作用优于Ag / TNA-c。提出了Ag / TNA PEC体系的机理来说明其氧化还原反应。