Formation of Sol Gel Dried Droplets of Carbon Doped Titanium Dioxide (TiO2) at Low Temperature via Electrospraying

3rd International Conference on Global Sustainability and Chemical Engineering

工业技术;化学工业

Halimi, S.U.^1 ; Abd Hashib, S.^1 ; Abu Bakar, N.F.^1 ; Ismail, S.N.^1 ; Nazli Naim, M.^2 ; Abd Rahman, N.^1 ; Krishnan, J.^3

Faculty of Chemical Engineering, Universiti Teknologi MARA, Malaysia^1

Food and Process Department, Faculty of Engineering, Universiti Putra Malaysia (UPM), Malaysia^2

Department of Chemical Engineering, SSN College of Engineering, Tamilnadu, India^3

关键词: Carbon precursors;    Carbon-doped titanium dioxide;    Chemical bondings;    Photocatalytic efficiency;    Strong absorptions;    Titanium Isopropoxide;    Visible light region;    Working distances;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/358/1/012048/pdf
DOI  :  10.1088/1757-899X/358/1/012048

学科分类：工业工程学

来源: IOP

【 摘 要 】

The high band gap energy of TiO2 and inconsistency in particles size has imposed a significant drawback on TiO2 applications. Dried droplets of carbon-doped TiO2 fine particles were produced by using electrospraying technique. The C-doped TiO2 particles were prepared by hydrolysis of titanium isopropoxide with the addition of carbon precursor followed by electrospraying the suspension in stable Taylor cone-jet mode. Coulomb fission of charged droplets from the electrospraying technique successfully transformed dispersed liquid C-doped TiO2 particles into solid. The deposited C-doped TiO2 droplets were collected on aluminium substrates placed at working distances of 10 to 20 cm from the tip of the electrospray needle. The collected C-doped TiO2 droplets were characterized by using FESEM, UV-Vis, FTIR and XRD. By increasing the working distance, the average droplets size of the deposited C-doped TiO2 was reduced from ±163.2 nm to ±147.56 nm. UV-Vis analysis showed a strong absorption in the visible-light region and about 93 nm red shift of the onset spectrum for C-doped TiO2. The red shift indicates an increase in photocatalytic efficiency by reducing the TiO2 band gap energy from 3.0 eV to 2.46 eV and shifting its activity to the visible-light region. FTIR analysis indicated the presence of Ti-C and C-O chemical bonding in the C-doped TiO2.