Titanium dioxide (TiO2) is one of metal oxide semiconductor applied to environment
applications because of non-toxic, strong ultraviolet (UV) absorption, widely energy bandgap of 3.2 eV
and good stability in photocatalyst reaction. TiO2 photocatalyst is used in various applications such as
photodegradation of organic and inorganic pollutant in waste water, hydrogen generation, air purification,
bacteria elimination and dye decolorization [1-3]. Phenomenon of photocatalyst that occurs under UV
irradiation resulting to the movement of electron from valence band to conduction band called
photoelectron-hole pair. However, UV in the natural light approximately is 3-5% relating to the
inactivation of TiO2 in this region [4] therefore low absorption in visible light is one of drawback in TiO2.
Nitrogen (N) doping in TiO2 is one of methods for enhancing its performance such as the
decrease of electron hole recombination and the extension of photoresponse from UV to the visible light
region. Therefore TiO2 efficiency is increased by these phenomena resulting to the improvement in the
photocatalytic activity. N-doped TiO2 structures can be fabricated by various methods such as
nanoparticle, nanorod, nanosheet, nanotube and nanofiber. In this study, the preparation in form of
nanofiber by electrospin process was chosen because of long-continuous fiber, controlled its diameter
size, porous structure after calcination and uncomplicated process.
The main objective of this work is to synthesize N-doped TiO2 nanofibers that used as
photocatalyst in the photocatalytic degradation of Rhodamine B (RhB) under visible light.
2. Experimental
N-doped TiO2 nanofibers (NF) were prepared by electrospinning process. First, the polymer