This study demonstrates the use of disposed liquid crystal display (LCD) glass as a supporting matrix for the fabrication of a binder/linker free thin film graphene electrode. Graphene oxide (GO) was drop casted onto the LCD matrix and electrochemically reduced to form an ErGO–LCD electrode which was subsequently employed for the electro-Fenton oxidation of ciprofloxacin. Fourier transform infrared spectroscopy confirms the presence of (i) functional groups such as C═O, N–H, C≡N, and C–N on the LCD matrix, (ii) attachment of GO onto the LCD, and (iii) reduction of oxygen functionalities at the surface of the ErGO–LCD electrode. Raman and X-ray photoelectron spectroscopy were performed to examine the nature and chemical composition of the GO–LCD and ErGO–LCD electrodes. Cyclic voltammetry and electrochemical impedance spectroscopic studies revealed the enhancement of the oxidation–reduction properties and reduction of charge transfer resistance (R_ct 17 Ω) in the presence of [Fe(CN)₆]^3–/4– redox species. Electro-Fenton results revealed that a high concentration of H₂O₂ (45 mg L^–1) was produced at acidic pH as compared to neutral (20 mg L^–1) or alkaline (15 mg L^–1) conditions. Furthermore, a higher current efficiency for the production of H₂O₂ was found at −1.0 V (63%) as compared to −1.5 V (59%) and −2.0 V (51%). Degradation studies showed >99% removal of ciprofloxacin was observed at pH 3.5 as compared to pH 7.0 (92%) or pH 9.0 (77%) at −1.5 V. The reuse experiments suggested that the electrode is stable and reusable for more than 7 cycles of experiments. The average pseudo-first-order kinetic rate constant for seven cycles of reuse was found to be 0.017 min^–1.

中文翻译：

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在导电LCD基质上制备石墨烯薄膜以进行环丙沙星氧化转化的绿色方法

这项研究证明了将放置的液晶显示器（LCD）玻璃用作制造无粘结剂/无接头薄膜石墨烯电极的支撑基质的用途。将氧化石墨烯（GO）滴铸到LCD基质上并进行电化学还原，形成ErGO-LCD电极，随后将其用于环丙沙星的电子芬顿氧化。傅里叶变换红外光谱法确认（i）LCD矩阵上存在（i）C═O，NH，C≡N和CN等官能团；（ii）GO附着在LCD上；以及（iii）降低ErGO-LCD电极表面的氧气功能。进行了拉曼光谱和X射线光电子能谱分析，以检查GO-LCD和ErGO-LCD电极的性质和化学成分。_ct 17Ω）在[Fe（CN）₆ ] ^{3– / 4–}氧化还原物质的存在下。电芬顿的结果表明，与中性（20 mg L ^–1）或碱性（15 mg L ^–1）条件相比，在酸性pH下产生高浓度的H ₂ O ₂（45 mg L ^–1）。此外，用于生产H ₂ O _2的电流效率更高与-1.5 V（59％）和-2.0 V（51％）相比，-V在-1.0 V（63％）处发现。降解研究表明，与在-1.5 V下的pH 7.0（92％）或pH 9.0（77％）相比，在pH 3.5时观察到环丙沙星的去除率> 99％。再用实验表明该电极稳定且可重复使用超过7种实验周期。发现七个重复使用周期的平均伪一级动力学速率常数为0.017 min ^–1。