DSpace at VNU: Fabrication of photocatalytic composite of multi-walled carbon nanotubes TiO 2 and its application for desulfurization of diese

Fabrication of photocatalytic composite of multi-walled carbonnanotubes/TiO 2 and its application for desulfurization of diesel Thu Ha Thi Vua,* , Thu Trang Thi Nguyena, Phuong Hoa Thi N

Fabrication of photocatalytic composite of multi-walled carbon

nanotubes/TiO 2 and its application for desulfurization of diesel

Thu Ha Thi Vua,* , Thu Trang Thi Nguyena, Phuong Hoa Thi Nguyena, Manh Hung Doa,

Hang Thi Aua, Thanh Binh Nguyenb, Dinh Lam Nguyenc, Jun Seo Parkd

a

Vietnam Institute of Industrial Chemistry, Hanoi, Viet Nam

b

Faculty of Chemistry, Hanoi University of Science, Vietnam National University, Hanoi, Viet Nam

c

Faculty of Chemical Engineering, Danang University of Technology, University of Danang, Viet Nam

d Division of Chemical Engineering, Hankyong National University, Ansung 456-749, Republic of Korea

desulfurization

[12,15,16] In addition, MWNTs have a large electricity-storage

[18–20] The rate of photo-catalytic oxidation of DBT and its

A R T I C L E I N F O

Article history:

Received 25 May 2011

Received in revised form 24 September 2011

Accepted 9 November 2011

Available online 19 November 2011

Keywords:

Desulfurization

Composite

Multi-walled carbon nanotubes

TiO 2

A B S T R A C T Compositeofmulti-walledcarbonnanotubes(MWNTs)andtitanium(IV)oxide(TiO2)werepreparedby

aheterogeneousgelationmethod.TheactivitiesoftheMWNTs/TiO2compositeswereevaluatedby photocatalyticoxidativedesulfurizationusingdibenzothiophene(DBT),4,6-dimethyldibenzothiophene (4,6-DMDBT),n-tetradecane,andcommercialdieselunderirradiationusingahigh-pressureHglamp ThemicrostructuresofMWNTs/TiO2compositeswerecharacterizedbyN2adsorption,scanningelectron microscopy,transmissionelectronmicroscope,andX-raydiffraction.Itwasfoundthatmorethan98%of sulfurcompoundsincommercialdieselwereoxidizedandremovedbytheuseoftheMWNTs/TiO2 compositeasaphotocatalyst

ß2011ElsevierLtd.Allrightsreserved

* Corresponding author Tel.: +84 422189067; fax: +84 439335410.

E-mail address: ptntd2004@yahoo.fr (T.H.T Vu).

0025-5408/$ – see front matter ß 2011 Elsevier Ltd All rights reserved.

[12]

4,6-DMDBT

photocatalyst

withincreasingMWNTscontentin thecomposites.Thiscanbe

Fig 1 SEM micrographs of the MWNTs/TiO 2 composites with different MWNTs/TiO 2 mass ratios: (a) TiO 2 , (b) MWNTs/TiO 2 : 1:20, (c) MWNTs/TiO 2 : 1:10, (d) MWNTs/TiO 2 :

Table 1

BET surface area (S BET ) of the MWNTs/TiO 2 composites.

/g)

other

Fig 2 TEM micrographs of the MWNTs/TiO 2 composites with different MWNTs/TiO 2 mass ratios; (a) TiO 2 , (b) MWNTs/TiO 2 : 1:20, (c) MWNTs/TiO 2 : 1/10, (d) MWNTs/TiO 2 : 1/

3, and (e) MWNTs.

[8,10]. When electron/hole pair recombination occurs after a

2-Theta - Scale

5 10 20 30 40 50 60 70 80

(a) (b)

(c)

TiO2

MWNTs

Fig 3 XRD patterns of (a) MWNTs, (b) TiO 2 , and (c) (1:20) MWNTs/TiO 2 composite.

Fig 4 Photoluminescence spectra of the MWNTs/TiO 2 composites with different MWNTs/TiO 2 mass ratios: (a) TiO 2 , (b) (1:20) MWNTs/TiO 2 , (c) (1:10) MWNTs/TiO 2 , (d) (1:3) MWNTs/TiO 2 , and (e) MWNTs.

Fig 7 Comparison between the photo-activity of TiO 2 and that of (1:20) MWNTs/ TiO 2 in the photo-oxidation reaction of (a) DBT, and (b) 4,6-DMDBT.

Fig 6 Adsorbability of TiO 2 , MWNTs/TiO 2 composites (mass ratios 1:20) for DBT,

4,6-DMDBT and diesel under dark condition.

Fig 8 Relation between sulfur content and reaction time.

4 Conclusions

Acknowledgement

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