Synthesis of NiFe2O4/TiO2-Ag+ S-scheme photocatalysts by a novel complex-assisted vapor thermal method for photocatalytic hydrogen production
| Autor: | Irem Firtina-Ertis, Özge Kerkez-Kuyumcu |
|---|---|
| Přispěvatelé: | Firtina-Ertis I., KERKEZ KUYUMCU Ö. |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Uzay bilimi
General Chemical Engineering Temel Bilimler (SCI) Mühendislik ENGINEERING General Physics and Astronomy Astronomi ve Astrofizik Fizik Kimya Chemical Engineering and Technology CHEMISTRY ASTRONOMİ VE ASTROFİZİK Magnetic photocatalyst Kimya Mühendisliği ve Teknolojisi Ag+ doping TiO2 MÜHENDİSLİK KİMYASAL ASTRONOMY & ASTROPHYSICS Engineering Computing & Technology (ENG) SPACE SCIENCE Genel Kimya Mühendisliği Temel Bilimler Physics Astronomy and Astrophysics Mühendislik Bilişim ve Teknoloji (ENG) General Chemistry Genel Fizik ve Astronomi Genel Kimya Fizik Bilimleri Natural Sciences (SCI) Physical Sciences Photocatalytic H2 production Engineering and Technology Mühendislik ve Teknoloji NiFe2O4 Natural Sciences ENGINEERING CHEMICAL |
| Popis: | © 2022 Elsevier B.V.This work aims to design and develop a photocatalyst with the main three properties: i) reduced bandgap for solar activation of the photocatalyst, ii) retarded e- / h+ recombination rate for the enhanced photocatalytic activity, iii) magnetic separability from the reaction medium. In this study, NiFe2O4/TiO2-Ag+ photocatalysts were synthesized to modify the structural properties of TiO2. Firstly, NiFe2O4 nanoparticles were synthesized by a conventional co-precipitation method, then in the presence of NiFe2O4 nanoparticles, TiO2 was synthesized by a novel complex-assisted vapor thermal (VT) method via slow hydrolysis of Ti-complex. After the best wt% amount of NiFe2O4 in the NiFe2O4/TiO2 had been determined for photocatalytic activity, Ag+ was added by wet-impregnation. The photocatalysts were characterized by X-ray diffraction (XRD), UV–vis Diffuse Reflectance Spectroscopy (DRS), Photoluminescence Spectroscopy (PL), vibrating sample magnetometer analysis (VSM), transmission electronic microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Photocatalytic hydrogen production reactions were carried out in methanol/water solution under solar light illumination. Consequently, the best configuration of the photocatalyst was determined as 12 wt% NiFe2O4/TiO2-0.5 wt% Ag+ (12NFT-0.50Ag+) which had shown the maximum hydrogen (H2) production rate as 137 µmol/g-cat after 5 h owing to its reduced bandgap energy and delayed e- / h+ recombination. |
| Databáze: | OpenAIRE |
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