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Novel eco-friendly method to prepare Ti/RuO2–IrO2 anodes by using polyvinyl alcohol as the solvent
Journal of Electroanalytical Chemistry ( IF 4.5 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.jelechem.2020.113822
Charlys Wilton dos Anjos Bezerra , Géssica de Oliveira Santiago Santos , Marilia Moura de Salles Pupo , Maria de Andrade Gomes , Ronaldo Santos da Silva , Katlin Ivon Barrios Eguiluz , Giancarlo Richard Salazar-Banda

Abstract Electrochemical oxidation processes are promising solutions for wastewater treatment due to their high efficiency, effortless control, and versatility. Mixed metal oxides anodes are particularly attractive due to their low cost and specific catalytic properties. Here, we report the synthesis of a new Ti/RuO2-IrO2 anode fabricated through an innovative eco-friendly methodology using polyvinyl alcohol (PVA) as the solvent. Comparative anodes were also prepared by the conventional method of polymeric precursors. For both methods, anodes were calcined at 300, 400, and 500 °C. X-ray diffraction data confirmed the formation of RuO2 and IrO2 in the rutile-type structure for all conditions. Moreover, compared to conventional polymeric precursor method, PVA-made anode obtained at 300 °C presented increased voltammetric charge (210%), besides reduced charge-transfer resistance (1.8-fold lower). Electrochemical degradation of the Reactive Blue 21 dye showed that the PVA-made Ti/RuO2-IrO2 anode has the highest degradation efficiency, and its kinetic rate constant is until 2 times greater than the conventional anode. Besides, due to rougher and more compact surfaces, the better adhesion of the film observed for the PVA-made anodes, the accelerated service lifetime of the anode was prolonged 4.3-fold.

中文翻译:

以聚乙烯醇为溶剂制备 Ti/RuO2–IrO2 负极的新型环保方法

摘要 电化学氧化工艺因其高效、轻松控制和多功能性而成为废水处理的有前途的解决方案。混合金属氧化物阳极由于其低成本和特定的催化性能而特别有吸引力。在这里,我们报告了通过使用聚乙烯醇 (PVA) 作为溶剂的创新环保方法制造的新型 Ti/RuO2-IrO2 阳极的合成。对比阳极也通过聚合物前体的常规方法制备。对于这两种方法,阳极在 300、400 和 500 °C 下煅烧。X 射线衍射数据证实了在所有条件下都在金红石型结构中形成了 RuO2 和 IrO2。此外,与传统的聚合物前驱体方法相比,在 300°C 下获得的 PVA 制成的阳极呈现出增加的伏安电荷(210%),除了降低电荷转移电阻(低 1.8 倍)。活性蓝21染料的电化学降解表明,PVA制成的Ti/RuO2-IrO2阳极具有最高的降解效率,其动力学速率常数比传统阳极大2倍。此外,由于更粗糙和更致密的表面,观察到 PVA 制成的阳极的薄膜附着力更好,阳极的加速使用寿命延长了 4.3 倍。
更新日期:2020-02-01
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