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005			20251125105759.0
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007			ta
008			201109t20202020my a|||frma|| 000 0 eng d
020			_aTHE0008569(Local)
040			_aUMP _beng _cUMP _erda
090			_aFTKA .F38 2020 r Thesis
100	1		_aKhatun, Fatema, _eauthor.
245	1	0	_aPhotocatalytic conversion of carbon dioxide to methane using RGO/Au-TNTs / _cFatema Khatun
264		1	_aKuantan, Pahang : _bUMP, _c2020
264		4	_a© 2020
300			_axiv, 135 pages : _billustrations (some color) ; _c30 cm. + _e1 CD ROM
336			_atext _2rdacontent
336			_atext _2rdacontent
337			_aunmediated _2rdamedia
337			_acomputer _2rdamedia
338			_avolume _2rdacarrier
338			_acomputer disc _2rdacarrier
347			_2rda _atext file _bPDF
500			_aFaculty of Civil Engineering Technology
502			_aThesis (Master of Science) -- Universiti Malaysia Pahang – 2020
504			_aIncludes bibliographical references
520	3		_aThe diversity of nanostructured material synthesis and exploring the proficient physical, chemical, and optical properties in order to investigate its catalytic efficiency is one of the most researched areas nowadays. This present study emphasizes on the reduction of immense CO2 gas in the atmosphere to valuable hydrocarbon fuel with the utilization of synthesized novel nanostructured photocatalyst. Titanium dioxide (TiO2) is one of the most widespread semiconductor photocatalysts for photocatalytic applications. Despite its eminence, it has major drawbacks in terms of higher bandgap (3.2 eV) and high recombination of photogenerated charge carriers. Due to its wide bandgap, the photoexcitation occurred only in the ultraviolet (UV) region of the electromagnetic spectrum. Moreover, the UV region is only 5% in the solar spectrum whereas the visible region comprises a total of 53%. Thus, the higher charge carrier recombination, with less visible light utilization during photoexcitation of TiO2 is one of the major challenges in photocatalytic domains. For this reason, in this study, a TiO2 based nanocomposite photocatalyst with enhanced visible light efficiency was developed through the combined electrochemical anodization, electrochemical deposition, and immersed method. The visible light absorption efficiency of the photocatalysts was revealed through UV-Vis analysis due to the LSPR nature of Au nanoparticles. In addition, the bandgap energy of the photocatalyst was reduced drastically which further shows a lower e-/h+ recombination rate attained through PL analysis. The photocatalytic performance of the prepared photocatalysts for the conversion of CO2 to CH4 yield follows an ascending order of TNTs <RGO-TNTs < Au-TNTs <RGO/Au-TNTs which are 4.1% <12.46% <22.32% <33.1%. The significant result obtained by utilizing RGO/Au-TNTs photocatalyst, for the reduction of CO2 to CH4. The total CH4 yield obtained after 2 h of photocatalytic performance for the RGO/Au-TNTs is 8.07 times higher than TNTs. To conclude, Titanium dioxide nanotube incorporated with Au was successfully synthesized through a facile electrochemical deposition method as well induced simple experimental set-up. The prolonged visible light absorption efficiency improved the TNTs e-/h+ recombination rate and enhanced the photocatalytic CO2 conversion efficiency towards visible light by employing LSPR effective Au nanoparticles and highly active RGO. Therefore, this approach opens the numerous paths for the efficient visible light photocatalyst (VLP) for utilizing a huge solar spectrum to produce hydrocarbon fuels from the excessive CO2 in the atmosphere.
610	2	0	_aFaculty of Civil Engineering Technology _xDissertations
650		0	_aUniversities and colleges _xDissertations
650		0	_aTheses
942			_2lcc _cTHESIS