Visible light-induced photocatalytic degradation of Reactive Blue-19 over highly efficient polyaniline-TiO 2 nanocomposite: a comparative study with solar and UV photocatalysis
Polyaniline-TiO (PANI-TiO ) nanocomposite was prepared by in situ polymerisation method. X-ray diffractogram (XRD) showed the formation of PANI-TiO nanocomposite with the average crystallite size of 46 nm containing anatase TiO . The PANI-TiO nanocomposite consisted of short-chained fibrous structur...
Saved in:
Published in | Environmental science and pollution research international Vol. 25; no. 4; p. 3731 |
---|---|
Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Germany
01.02.2018
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Polyaniline-TiO
(PANI-TiO
) nanocomposite was prepared by in situ polymerisation method. X-ray diffractogram (XRD) showed the formation of PANI-TiO
nanocomposite with the average crystallite size of 46 nm containing anatase TiO
. The PANI-TiO
nanocomposite consisted of short-chained fibrous structure of PANI with spherical TiO
nanoparticles dispersed at the tips and edge of the fibres. The average hydrodynamic diameter of the nanocomposite was 99.5 nm. The band gap energy was 2.1 eV which showed its ability to absorb light in the visible range. The nanocomposite exhibited better visible light-mediated photocatalytic activity than TiO
(Degussa P25) in terms of degradation of Reactive Blue (RB-19) dye. The photocatalysis was favoured under initial acidic pH, and complete degradation of 50 mg/L dye could be achieved at optimum catalyst loading of 1 g/L. The kinetics of degradation followed the Langmuir-Hinshelhood model. PANI-TiO
nanocomposite showed almost similar photocatalytic activity under UV and visible light as well as in the solar light which comprises of radiation in both UV and visible light range. Chemical oxygen demand removal of 86% could also be achieved under visible light, confirming that simultaneous mineralization of the dye occurred during photocatalysis. PANI-TiO
nanocomposites are promising photocatalysts for the treatment of industrial wastewater containing RB-19 dye. |
---|---|
ISSN: | 1614-7499 |