Please do not adjust margins
New Journal of Chemistry
Page 5 of 7
DOI: 10.1039/C8NJ00407B
Journal Name
ARTICLE
Notes and references
1
2
3
4
5
6
7
8
9
S. N. Habisreutinger, L. Schmidt-Mende, J. K. Stolarczyk,
Angew. Chem. Int. Ed., 2013, 52, 7372-7408.
J. Yu, J. Low, W. Xiao, P. Zhou, M. Jaroniec, J. Am. Chem. Soc.,
2014, 136, 8839-8842.
A. Begum, P. G. Pickup, Electrochem. Commun., 2007,
2525-2528.
9
,
S. H. Kim, P. B. Kelly, A. J. Clifford, Anal. Chem., 2008, 80
7651-7660.
,
J. Bonin, M. Chaussemier, M. Robert, M. Routier,
ChemCatChem, 2014, , 3200-3207.
Fig. 8 Sketch of the proposed mechanism of bandgap energy change, charge separation
6
and photocatalytic reactions for CO2 conversion under UV-visible light irradiation on
M. Tahir, N. S. Amin, Appl. Catal. B: Environ., 2015, 162, 98-
109.
Q. D. Truong, H. T. Hoa, D. N. Vo, T. S. Le, New J. Chem.,
2017, 41, 5660-5668.
O. Ozcan, F. Yukruk, E. U. Akkaya, D. Uner, Top. Catal., 2007,
44, 523-528.
C. Wang, R. L. Thompson, P. Ohodnicki, J. Baltrus, C.
Matranga, J. Mater. Chem., 2011, 21, 13452-13457.
KNbWO6·H2O:xSn2+
.
According to the experimental results, a possible reaction
mechanism of the photocatalytic for CO2 reduction is
proposed, as shown in Fig. 8. The UV-visible light absorption of
KNbWO6·H2O is extended after doping with Sn2+, the reduction
of bandgap promote better separation of charge, resulting in
photo induced electron-hole pairs after absorbing photons
with energy equals to or greater than its bandgap. The holes
with strong oxidizing properties can be utilized to produce
plenty of •OH radicals, further reaction can convert water into
O2 and H+. Simultaneously, the photo-generated electrons with
a strong reducibility and the adsorbed CO2 on the surface react
to products CO and CH4. Besides, the fact that no HCOOH,
HCHO and CH3OH etc. are detected in the product suggests
that the reduced CO2 have been fully converted into CO and
CH4. More importantly, the total amount of the gas produced
by the catalyst after UV-visible light conforms to the
stoichiometric ratio.
10 Y. P. Xie, G. Liu, L. Yin, H.M. Cheng, J. Mater. Chem., 2012, 22
6746-6751.
11 S. Ijaz, M.F. Ehsan, M.N. Ashiq, N. Karamt, M.Najam-ul-Haq,
T.He, Mater. & Design, 2016, 107, 178-186.
12 J. Fu, B. Zhu, C. Jiang, B. Cheng, W. You, J. Yu, Small, 2017,
13,1603938.
13 P. Li, S. Ouyang, G. Xi, T. Kako, J. Ye, J. Phys. Chem. C, 2012,
116, 7621-7628.
14 Y. Liu, B. Huang, Y. Dai, X. Zhang, X. Qin, M. Jiang, M.-H.
Whangbo, Catal. Commun., 2009, 11, 210-213.
15 A. Dhakshinamoorthy, S. Navalon, A. Corma, H. Garcia,
Energy Environ. Sci., 2012,
16 Y. Wang, X. Bai, H. Qin, F. Wang, Y. Li, X. Li, S. Kang, Y. Zuo, L.
Cui, Appl. Mater. Interfaces, 2016, , 17212-17219.
,
5, 9217-9233.
8
17 W. Ong, L. Tan, Y. Ng, S. Yong, S. Chai, Chem. Rev., 2016, 116
7159-7329.
,
18 Y. Wang, X. Bai, F. Wang, S. Kang, C. Yin, X. Li, J. Hazard.
Mater., DOI: 10.1016/j.jhazmat.2017.10.007
19 S. Ikeda, T. Itani, K. Nango, M. Matsumura, Catal. Lett., 2004,
98, 229-233.
20 R. R. Jitta, R. Gundeboina, N. K. Veldurthi, R. Guje, V. Muga, J.
Chem. Technol. Biotechnol., 2015, 90, 1937-1948.
21 L. Schwertmann, M. Wark, R. Marschall, RSC Adv., 2013, 3,
18908-18915.
22 G. Zhang, W. Jiang, S. Yu, Mater. Res. Bull., 2010, 45, 1741-
1747.
23 M. Sun, D. Li, Y. Chen, W. Chen, W. Li, Y. He, X. Fu, J. Phys.
Chem. C, 2009, 113, 13825-13831.
24 R. Guje, P. Shrujana, N. K. Veldurthi, R. Gundeboina, N. R.
Kappera, V. Muga, Chem. Pap., 2015, 69, 269-278.
25 S. Uma, J. Singh, V. Thakral, Inorg. Chem., 2009, 48, 11624-
11630.
26 P. Kanhere, Y. Tang, J. Zheng, Z. Chen, J. Phys. Chem. Solids,
2013, 74, 1708-1713.
27 R. R. Jitta, R. Guje, N. K. Veldurthi, S. Prathapuram, R.
Velchuri, V. Muga, J. Alloy. Compd., 2015, 618, 815-823.
28 Y. Hosogi, K. Tanabe, H. Kato, H. Kobayashi, A. Kudo, Chem.
Lett., 2004, 33, 28-29.
Conclusions
In summary, we have prepared a defect pyrochlore oxide
KNbWO6·H2O:xSn2+(x=0.163, 0.174, 0.208) from KNbWO6·H2O
by facile ion-exchange reaction. KNbWO6·H2O:xSn2+ can be
used as a photocatalysts for effectively conversion of CO2. It is
demonstrated that KNbWO6·H2O:0.208Sn2+ was obtained from
KNbWO6·H2O by ion exchange, the amount of CO and CH4
produced by photocatalytic reduction of CO2 is more than
doubled. This is attributed to the extended visible-light
absorption. The reduction of band gaps after Sn2+ doping
promotes the generation of photogenerated electron-hole
pairs, and the adsorption capacity for CO2 also has been
enhanced after Sn2+ doping. This work provides a feasible
route to apply defect pyrochlore structure materials for
photocatalytic technology utilizing abundant solar light to
coping with energy and environmental issues.
29 Y. Hosogi, Y. Shimodaira, H. Kato, H. Kobayashi, A. Kudo,
Chem. Mater., 2008, 20, 1299-1307.
30 M. Melle-Franco, G. Pacchioni, A. V. Chadwick, Surf. Sci.,
2001, 478, 25-34.
31 Y. N. Han, S. Jiao, M. Xu, G. Pang, S. Feng, RSC Adv., 2014, 4,
Conflicts of interest
There are no conflicts to declare.
14357-14360.
32 Y. N. Han, S. Jiao, M. Xu, Y. Xu, G. Pang, S. Feng, RSC Adv.,
2014, , 24142-24146.
33 Z. Zhang, D. Jiang, D. Li, M. He, M. Chen, Appl. Catal. B:
Environ., 2016, 183, 113-123.
Acknowledgements
4
This work was supported by the National Natural Science
Foundation of China (No. 21371066).
This journal is © The Royal Society of Chemistry 20xx
J. Name., 2013, 00, 1-3 | 5
Please do not adjust margins