graphene photocatalytic catalyst preparation and
TRANSCRIPT
2017 International Conference on Energy Development and Environmental Protection (EDEP 2017) ISBN: 978-1-60595-482-0
Graphene Photocatalytic Catalyst Preparation and Properties of Composite Materials Research
Qiao-Fei WANGa, Jia-Qi PANb, Peng CHENc, Chun-Yan CHId and Chao-Rong LIe,*
Department of Physics and Key Laboratory of ATMMT Ministry of Education Zhejiang, Sci-Tech University, Hangzhou 310018, China
*Corresponding author
Keywords: rGO, Ag, TiO2, Composite materials, Photocatalysis.
Abstract. Using a pan of the Ag/TiO2/rGO ternary composites, including ethanol as solvent,
not only as a reductant in GO with the reduction of silver nitrate, the addition of ammonia water
can not only catalytic hydrolysis TBOT to TiO2 can also form with silver nitrate silver ammonia
solution is conducive to the reduction of silver nitrate. And the GO surface exist a large amount
of oxygen-containing groups can provide nucleation points for the growth of the nanoparticles.
Can control the dosing raio of TBOT and GO different morphology of TiO2/rGO composite
material is prepared. Photocatalytic degradation of methylene blue test studied Ag modified
enhanced the photocatalytic activity of TiO2 light influence.
1. Introduction
The Ag/TiO2/rGO preparation and photocatalytic properties of ternary composites is studied.
Graphene composites with silver nanoparticles can be used in surface enhanced Raman SERS,
sterilization, such as catalysis, batteries play an important role in the field of (1-8). The current
is one of the focus group studies both at home and abroad. Ag with rGO composite for the
Ag/TiO2/rGO provides a new way of thinking, by above knowable confirmed photocatalytic
activity of TiO2/rGO. If the TiO2/rGO again and Ag NPs composite is equal to the modified
TiO2 and rGO composite, using graphene excellent electrical conductivity can be Ag NPs with
TiO2 closely linked together. This study obtained the graphene synthesis silver compound nano
flake structure, not only prevents the reunion of graphene, and load in graphene layer upon layer
between the silver nanoparticles to improve the specific surface area of nano silver, which
significantly improves the carrier catalyst on the reduction of nitro phenol reactivity. This study
is put forward based on structured carrier in the controlled synthesis of nano metal surface, not
only effectively improve the stability and catalytic activity of metal nanoparticles, and carrier of
the large size is easy to realize the separation and recovery of the catalyst. This study for the
functional nano metal catalysis has universal significance in the study of composite material.
2. Experimental
100mL GO adding tetrabutyl titanate ethanol solution, mixing 5 min.Stir in AgNO3 10mg,
15min. Add the PVP 50mg, add 0.1mL ammonia and quickly transferred to the five ptfe
reaction kettle in oven at 180°C 18h, the product obtained alternately with deionized water,
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ethanol washing three times. Regulation of tetrabutyl titanate can be prepared for the amount of
the different shape of rGO/TiO2 composite materials.
3. Results and Discussion
Figure 1. XRD patterns of the Ag/TiO2/rGO.
XRD characterization of Ag/TiO2 / rGO, diffraction Angle is 38.1°and 44.2° and 64.4°and
77.4°Ag characteristic peak, diffraction Angle is 25.2° and 48.1° and 53.8° and 62.7° in TiO2
characteristic peak.Less TiO2 diffraction peak may be the cause of the Ag peak was too was
caused by its cover.No graphene diffraction peaks might be due to strong diffraction peaks of
the titanium dioxide at 25.3° obscures the graphene weaker signal.XRD characterization of
Ag/TiO2 / rGO success of ternary composites preparation.
Figure 2. SEM and.EDS spectrum of Ag/TiO2/rGO.
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Duo to Ag/TiO2 / rGO ternary composites of SEM (figure 2) to detect the graphene surface
load has a large size between 50-100 nm silver nanoparticles.Combining and titanium dioxide
and graphene, particle size of more than 10 nanometers, under the condition of 180°C formed
between TiO2 and rGO Ti - O - C key. Graphene nano appear typical fold, combines Ag
nanoparticles and titanium dioxide and its surface.EDX spectrum diagram (D) as shown in
figure 2 shows the Ag and the characteristic peaks of Ti.
500 550 600 650 700 750
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Ab
so
rptio
n
waelenghth/ nm
0h
3h
A
500 550 600 650 700 750
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
Ab
so
rptio
n
waelenghth/ nm
0h
3h
B
Figure 3. UV−vis absorption spectra of(A) TiO2/rGO; (B) Ag/TiO2/rGO.
In order to observe the fine structure of Ag/TiO2 / rGO, characterization of the composite
transmission electron microscopy (sem). Graphene sheets and Ag and TiO2 good combination,
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the particle size of the silver nanoparticles is about more than ten nanometers ornament in
graphene sheet, and relatively small uniform distribution in graphene nano TiO2 particle size on
a chip, using graphene excellent electrical conductivity can Ag and TiO2 in photocatalytic
reaction process together, to reach the goal of enhancing TiO2 visible light catalytic efficiency.
4. Conclusions
In this chapter, we are using solvent hot method, sol-gel on the carrier of graphene, the
synthesis of Ag/TiO2/rGO composite materials. Ag to join to play an important role in
improving the photocatalytic activity of TiO2, in the preparation of TiO2/rGO composite
materials, on the basis of introducing the precious metals, not only will not affect the adsorption
of composites can also boost the photocatalytic activity of TiO2, through visible light catalytic
degradation of methylene blue solution obtained under the condition of TiO2/rGO composite
materials and Ag/TiO2/rGO visible light catalytic properties of composite material has a certain,
after 4 h of TiO2 visible light/rGO composite materials and Ag/TiO2/rGO composite
photocatalytic efficiency were 53.3% and 78.9% respectively.
Acknowledgement
This work was supported by the National Natural Science Foundation of China (Nos.
91122022and 51172209).
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