Biodiesel photoelectrocatalytic synthesis employing α-Fe2O3 film decorated with Pt nanoparticles as photoanode

IF 5.2 2区 化学 Q1 CHEMISTRY, APPLIED Catalysis Today Pub Date : 2024-08-15 DOI:10.1016/j.cattod.2024.114997
Wagner N. Soares , Antonio G.R. Costa , Rejane M.P. Silva , Sidney G. Lima , Tiago P. Braga , Isolda Costa , Geraldo E. Luz Jr , Reginaldo S. Santos
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Abstract

In this work, photoelectrochemical route for biodiesel production using an electrochemical cell configured with platinum and α-Fe2O3 modified with Pt nanoparticles as electrodes was investigated. XRD patterns registered for film prepared by modified hydrothermal method revealed a trigonal structure of the hematite (α-Fe2O3) phase. The α-Fe2O3 film surface was decorated by metallic Pt nanoparticles (PtNP) in order to reduce the charge recombination and improve the photocatalytic efficiency. The band gap energy (EBG) of the α-Fe2O3 and PtNP/α-Fe2O3 films was estimated by UV-Vis spectroscopy at approximately 2.1 eV. Electrochemical measurements showed that the oxide is an n-type semiconductor adequate to be used as a photoanode in biodiesel synthesis. Under polarization conditions, the electrochemical cell changed the pH from 7 to 14 when the system was polarized at 5.0 V. In the synthesis of biodiesel by esterification reaction, oleic acid, 300 µL of 0.1 mol L−1 aqueous KCl solution and methanol were used as precursor reagents. The reaction was carried out free of strong base, such as KOH or NaOH, as a supporting electrolyte. In this route, the reduction of the water molecule occurred on the cathode, with the formation of hydroxyl (OH-) species, methoxy, and consequently fatty acid methyl esters (FAMEs). Thermogravimetric analysis (TGA) and Gas chromatography coupled to mass spectrometry (CG-MS) were performed to evaluate the catalysis products. GC-MS analyzes show that the reaction has a yield of about 7 % with the formation of FAMEs, such as methyl 9-octadecenoate, methyl hexadecanoate and methyl hexadecanoate.

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采用铂纳米颗粒装饰的 α-Fe2O3 薄膜作为光阳极的生物柴油光电催化合成技术
在这项研究中,研究人员使用铂和用铂纳米颗粒修饰的 α-Fe2O3 作为电极配置的电化学电池,研究了生物柴油生产的光电化学途径。改良水热法制备的薄膜的 XRD 图显示赤铁矿(α-Fe2O3)相呈三叉结构。α-Fe2O3薄膜表面装饰有金属铂纳米颗粒(PtNP),以减少电荷重组,提高光催化效率。通过紫外可见光谱测定,α-Fe2O3 和 PtNP/α-Fe2O3 薄膜的带隙能 (EBG) 约为 2.1 eV。电化学测量结果表明,这种氧化物是一种 n 型半导体,足以用作生物柴油合成过程中的光阳极。在极化条件下,当系统的极化电压为 5.0 V 时,电化学电池的 pH 值从 7 变为 14。在通过酯化反应合成生物柴油的过程中,使用了油酸、300 µL 0.1 mol L-1 氯化钾水溶液和甲醇作为前驱试剂。反应不使用 KOH 或 NaOH 等强碱作为支撑电解质。在此过程中,水分子在阴极上发生还原,形成羟基(OH-)、甲氧基,进而形成脂肪酸甲酯(FAMEs)。对催化产物进行了热重分析(TGA)和气相色谱-质谱联用分析(CG-MS)。气相色谱-质谱分析表明,该反应的产率约为 7%,生成的脂肪酸甲酯有 9-十八烯酸甲酯、十六烷酸甲酯和十六烷酸甲酯。
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来源期刊
Catalysis Today
Catalysis Today 化学-工程:化工
CiteScore
11.50
自引率
3.80%
发文量
573
审稿时长
2.9 months
期刊介绍: Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.
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