Ionic liquid assisted hydrothermal fabrication of hierarchically organized γ-AlOOH hollow sphere

Journal Article · Thu Nov 15 04:00:00 EST 2012 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2012.08.030· OSTI ID:22215550

Tang, Zhe ^[1]; Liu, Yunqi ^[1]; Li, Guangci ^[1]; Hu, Xiaofu ^[1]; Liu, Chenguang ^[1]

---

1. State Key Laboratory of Heavy Oil Processing, Key Laboratory of Catalysis, China National Petroleum Corporation (CNPC), China University of Petroleum (East China), Qingdao 266555 (China)

Highlights: ► The γ-AlOOH hollow spheres were synthesized via an ionic liquid-assisted hydrothermal treatment. ► Ionic liquid plays an important role in the morphology of the product. ► Ionic liquid can be easily removed from the product and reused in next experiment. ► A “aggregation–solution–recrystallization” formation mechanism may occur in the system. -- Abstract: Hierarchically organized γ-AlOOH hollow spheres with nanoflake-like porous surface texture have been successfully synthesized via an ionic liquid-assisted hydrothermal synthesis method in citric acid monohydrate (CAMs). It was found that ionic liquid [bmim]{sup +}Cl{sup −} played an important role in the morphology of the product due to its strong interactions with reaction particles. The samples were characterized by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscope (SEM) and Transmission Electron Microscopy (TEM). The results show that the product has narrow particle size distribution (500–900 nm particle diameter range), high specific surface area (240.5 m{sup 2}/g) and large pore volume (0.61 cm{sup 3}/g). The corresponding γ-Al{sub 2}O{sub 3} hollow spheres can be obtained by calcining it at 550 °C for 3 h. The proposed formation mechanism and other influencing factors of the γ-AlOOH hollow sphere material, such as reaction temperature, reaction duration, CAMs and urea, have also been investigated.

• OSTI ID: 22215550
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 11 Vol. 47; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CITRIC ACID
CRYSTAL GROWTH
FOURIER TRANSFORMATION
HYDROTHERMAL SYNTHESIS
INFRARED SPECTRA
LIQUIDS
MICROSTRUCTURE
MOLTEN SALTS
NANOSTRUCTURES
PARTICLE SIZE
POROUS MATERIALS
SCANNING ELECTRON MICROSCOPY
STRONG INTERACTIONS
SURFACES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION