Photocatalysis

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photocatalytic degradation of methylene blue dye using titanium dioxide doped with Nitrogen

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PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE DYE USING TITANIUM DIOXIDE (TiO2) MODIFIED WITH NITROGEN :

A RESEARCH PROJECT DEFENCE BY DOCTOR STEPHEN KASU/11/CHM/1048 DEPARTMENT OF CHEMISTRY KADUNA STATE UNIVERSITY SUPERVISOR: DR. MOSES T. YILLENG APRIL 2016. PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE DYE USING TITANIUM DIOXIDE (TiO 2 ) MODIFIED WITH NITROGEN

INTRODUCTION TO PHOTOCATALYSIS:

INTRODUCTION TO PHOTOCATALYSIS The energy that the Earth receives from the Sun is about 3 ×10 24 joules a year, which is nearly 10,000 times more than the global energy consumption 1 photocatalysis heterogeneous semiconductors homogeneous TiO 2

PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE USING N-TiO2 :

PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE USING N-TiO 2 Structural formula of methylene blue dye Mechanism of photodegradation

STATEMENT OF RESEARCH PROBLEM :

STATEMENT OF RESEARCH PROBLEM High level of organic dye pollutant example methylene blue Large band gap energy of TiO 2 photocatalyst Small fraction of UV radiation (3-5%) of solar radiation 45% wasted visible radiation of solar energy JUSTIFICATION Doping of the TiO 2 with nitrogen to enhance visible radiation photocatalytic activity

AIM: To synthesize, investigate the photocatalytic activity of titanium dioxide (TiO2) modified with nitrogen in degradation of methylene blue dyes. :

AIM: To synthesize, investigate the photocatalytic activity of titanium dioxide (TiO 2 ) modified with nitrogen in degradation of methylene blue dyes. OBJECTIVE: To develop an understanding of the chemical and photochemical properties of pure and modified TiO 2 in nanostructure form To modify TiO 2 nanoparticles with nitrogen which foster high efficiency in activity Photocatalytic degradation of organic dyes using titanium dioxide (TiO 2 ) modified with nitrogen.

METHODOLOGY:

METHODOLOGY Preparation of the photocatalyst (N-TiO 2 ) Catalyst preparation as describe by Chakraborty and Roychudhury. 2 TiO 2 + NH 3 SOLUTION HOMOGINATION OVEN DRYING CALCINATION

METHODOLOGY CONTINUATION:

METHODOLOGY CONTINUATION Photocatalytic degradation of methylene blue (MB) N-TiO 2 + MB MIXTURE CENTRIFUGATION FT-IR ANALYSIS DEGRADATION STIRRING OVEN DRYING

RESULT:

RESULT

FT-IR RESULT:

FT-IR RESULT From the FT-IR spectrum of the used 1%N-TiO 2 shown in the spectrum. Ti-O-Ti stretching observed at 586.38cm -1 and 509.22cm -1 . A C-H stretching loop of an aromatic molecule is observed at 717.54cm -1 and 879.57cm -1 from the methylene blue dye. A C-N stretching of an aliphatic amine was observed at 1018.45cm -1 and another stretching was also at 1419.66cm -1 due to C-C in the aromatic structure. Also C-H stretching of the methyl groups at 2924.18cm -1 . While at 3371.68cm -1 and 3495.13cm -1 belongs to N-H stretching of an amine group of the methylene blue dye

RESULT CONT:

RESULT CONT

RESULT CONT.:

RESULT CONT.

RESULT CONT:

RESULT CONT

KINETICS OF METHYLENE BLUE DEGRADATION:

KINETICS OF METHYLENE BLUE DEGRADATION

DISCUSSION:

DISCUSSION FT-IR analysis Rate of photocatalytic degradation of methylene blue dye Effect of time on the photocatalytic degradation of methylene blue dye Effluence of non-metal loading on photocatalytic degradation of methylene blue dye Kinetics of methylene blue degradation

CONCLUSION:

CONCLUSION This research have justified the synthesis and investigation of the nitrogen doped TiO 2 photocatalyst in the treatment of organic industrial dyes by degrading methylene blue dyes Percentage conversion for the rate of degradation of methylene blue was 97.30%, 85.75%, 65.10% and 60.30% using 1%N-TiO 2 , 3%N-TiO 2 , 5%N-TiO 2 and PURE-TiO 2 under ultraviolet light after 80 minutes of irradiation respectively lines slope 0.0490, 0.0287, 0.0143 and 0.0118 corresponding to 1%TiO 2 , 3%N-TiO 2 , 5%N-TiO 2 and PURE-TiO 2 photocatalysed reaction which is the apparent rate constant Generally , the degradation efficiency follows the following trend 1%N-TiO 2 >3%N-TiO 2 >5%N-TiO 2 >PURE-TiO 2 . Therefore, doping TiO 2 with nitrogen shows higher activity toward degradation of methylene blue dye compare to pure TiO 2 .

RECOMMENDATION:

RECOMMENDATION Employment in textile or food processing industries organic dye waste treatment U nnecessary high temperature (>500˚C) should be avoided Further studies should be done in view of its applicability in electro-chromic device , polyfunctional adsorbent and photovoltaic technology Investigation using other amino group precursor should be employ to avoid chemisorb as portrayed by ammonia.   Activities under natural sunlight should be employ.

REFFERENCE:

REFFERENCE 1 visible light photocatalyst for synthesis of fine organic chemicals on supported nanostructure . . C, chen . beijing  : s.n ., 2013 2. Fish bone derieved natural hydroxyapatite-supported copper acid catalyst: taguchi optimization of semibatch oleic esterification. R. Chakraboty , D. Roychowdhury . Chemical engineering journal

THANK YOU :

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