Maryam Shirvani, Tianjian Zhang, Yanlong Gu and Mona Hosseini-Sarvari*,
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引用次数: 0
摘要
本研究提出了一种新颖、环保、经济的磁性混合光催化剂Fe3O4@SiO2/ l -色氨酸，通过可扩展的三步绿色方法，利用自然和农业废物合成。Fe3O4@SiO2/ l -色氨酸纳米粒子具有高比表面积（63.14 m2/g）、强可见光吸收(λ >；448 nm)，窄带隙（1.84 eV）和超顺磁性能（22 emu/g），实现了高效的分离和可重复使用。表征技术（XRD， XPS, FT-IR, FE-SEM, HR-TEM, UV-vis DRS， TGA， BET和EIS）证实了其结构稳定性，电荷分离和界面电荷传输。该光催化剂以O2为氧化剂，在可见光下对二苯并噻吩（DBT）的氧化脱硫率达到82.1%，甲苯和苯乙烯的转化率分别达到85%和90%。经过5次循环后，其活性仍保持在85%以上，具有优异的耐久性。第一次，所有成分均来自天然来源：Fe3O4来自高粱种子提取物，SiO2来自稻壳，l -色氨酸用于增强光吸收和电荷分离。这种可持续的合成减少了化学废物和能源消耗，为环境友好型光催化剂设定了新的基准。
Green Synthesis of Nano-Sized Multiflower-like Fe3O4@SiO2/L-Tryptophan from Natural Resources and Agricultural Waste: A Photo-Switchable Oxidation Catalyst
This study presents a novel, eco-friendly, and cost-effective magnetic hybrid photocatalyst, Fe3O4@SiO2/L-tryptophan, synthesized through a scalable three-step green approach using natural and agricultural waste. The Fe3O4@SiO2/L-tryptophan nanoparticle features a core–shell structure with a high surface area (63.14 m2/g), strong visible-light absorption (λ > 448 nm), a narrow band gap (1.84 eV), and superparamagnetic properties (22 emu/g), enabling efficient separation and reusability. Characterization techniques (XRD, XPS, FT-IR, FE-SEM, HR-TEM, UV–vis DRS, TGA, BET, and EIS) confirmed its structural stability, charge separation, and interfacial charge transport. The photocatalyst achieved 82.1% oxidative desulfurization of dibenzothiophene (DBT) and high conversion rates for toluene (85%) and styrene (90%) under visible light using O2 as an oxidant. It retained over 85% activity after five cycles, demonstrating excellent durability. For the first time, all components are derived from natural sources: Fe3O4 from sorghum seed extract, SiO2 from rice husk, and L-tryptophan for enhanced light absorption and charge separation. This sustainable synthesis reduces chemical waste and energy consumption, setting a new benchmark for environmentally friendly photocatalysts.
期刊介绍：
Langmuir is an interdisciplinary journal publishing articles in the following subject categories:
Colloids: surfactants and self-assembly, dispersions, emulsions, foams
Interfaces: adsorption, reactions, films, forces
Biological Interfaces: biocolloids, biomolecular and biomimetic materials
Materials: nano- and mesostructured materials, polymers, gels, liquid crystals
Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry
Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals
However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do?
Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*.
This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).
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