(222a) Fabrication of Homologous TiO2/NH2-MIL-125(Ti) Heterojunction for Effcient Visible-Light-Induced Aerobic Oxidation of Benzyl Alcohol and Degration of Degradation of Tetracycline

Authors: 
Li, X., South China University of Technology
Li, Z., South China University of Technology
Xiao, J., South China University of Technology
Pi, Y., South China University of Technology

Fabrication of homologous TiO2/NH2-MIL-125(Ti) heterojunction for effcient visible-light-induced
aerobic oxidation of benzyl alcohol and degradation of tetracycline

Xiyi Li, Yunhong Pi, Zhong Li, Jing Xiao*

Incorporation
of noble metal nanoparticles is one effective approach to limit the
recombination of photo-induced carriers in NH2-MIL-125(Ti), although it suffers from the loss of active
intermediate Ti3+. In this work, TiO2/NH2-MIL-125(Ti) heterojunction is synthesis to facilitate the transfer
of photo-induced electrons/holes pairs, and preserve the Ti3+ during
the transfer process at the same time. The TiO2/NH2-MIL-125(Ti) shows higher photo-degradation efficiency of
tetracycline compared with the pristine NH2-MIL-125(Ti), as shown in Figure 1. Moreover, in the
visible-light-induced aerobic oxidation of benzyl alcohol, TiO2/NH2-MIL-125(Ti) exhibits highest conversion among the pristine NH2-MIL-125(Ti), Pt/NH2-MIL-125(Ti),
P-25 and CdS, as shown in Figure 2. The
electron spin resonance (ESR) spectroscopy, photocurrent response measurements,
and electrochemical impedance spectroscopy (EIS) are used to illustrated the
photocatalytic mechanism. The higher photocurrent and smaller impedance
guarantee the efficient transfer of TiO2/NH2-MIL-125(Ti), and the signal of Ti3+ under visible light
confirmed the preservation of Ti3+ during photocatalysis
reaction. The presevation of Ti3+ facilitate the
generation of O2¡¤-, and
resulting in higher yield of benzaldehyde from benzyl alcohol, as shown in Figure
3
. This work offers a facile route to promote the transfer of photo-induced
e-/h+ without the loss of the active species of Ti3+ in NH2-titanium
terephthalate metal-organic framework.

Keywords:
TiO2/NH2-MIL-125(Ti); O2¡¤-;
photocatalytic oxidation

Figure 1 Photocatalytic degradation of tetracycline in NH2-MIL-125(Ti) and TiO2/NH2-MIL-125(Ti).

(Reaction condition: 25 mg photocatalyst, 50 ml solvent, 30 ppm tetracycline and 25 W Xenon lamp >420 nm)

Figure 2 The Conversion of photocatalytic oxidation of benzyl alcohol.

(Reaction condition: 50 mg photocatalyst, 6 ml solvent, 3 mmol benzyl alcohol, 1 atm O2, and 300 W Xenon lamp >420 nm)

Figure 3 The mechanism of photocatalytic oxidation of benzyl alcohol over TiO2/NH2-MIL-125(Ti).

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