Crystallization of microporous TiO
deposition of Pt for photocatalytic degradation of volatile organic
Received: 15 October 2017 /Accepted: 13 March 2018 /Published online: 25 March 2018
Springer-Verlag GmbH Germany, part of Springer Nature 2018
The photocatalytic mineralization efficiency of volatile organic compounds (VOCs) is determined by adsorption of reactants,
separation of charge carriers, and reaction activity of catalyst surface. Herein, we provide a strategy to synthesize a novel catalyst,
namely, PhPt-Micro, which is characterized by high adsorption ability, charge separation efficiency, and surface reaction activity.
Toluene was chosen as the model VOC. The effects of photochemical deposition of Pt on the physical properties of microporous
(Micro) and toluene mineralization were studied using N
adsorption/desorption, transmission electron micros-
copy, X-ray diffraction, X-ray photoelectron spectroscopy, GC-flame ionization detection, and surface photovoltage spectrosco-
py (SPS) analyses. After photochemical treatment, the structure of Micro was optimized, and Pt nanoparticles were successfully
deposited at the outlet of electrons on the catalyst surface. SPS result proved that the optimized structure enhanced the separation
efficiency of charge carriers and the migration of photo-generated electrons to the PhPt-Micro surface. The quasi-equilibrium
adsorption amount of toluene over PhPt-Micro was two times higher than that with commercial nano TiO
(P25). The micropores
concentrated toluene on the catalyst surface and hindered intermediate desorption. The mineralization efficiency of toluene over
PhPt-Micro was 2.4 and 5.9 times higher than those over Micro and P25, respectively.
Volatile organic compounds (VOCs) are a group of highly
abundant gaseous pollutants emitted from commercial and
industrial processes(Liu et al. 2008; Wei et al. 2008). These
compounds can cause respiratory diseases, heart diseases, and
even cancer (Kampa and Castanas 2008). VOCs are important
precursors of PM
and are involved in complex re-
gional air pollution (Huang et al. 2014; Zhang et al. 2014).
VOCs can be controlled through physical and chemical tech-
nologies, such as adsorption (Tefera et al. 2014),
photocatalysis (Weon and Choi 2016), non-thermal plasma
(Karatum and Deshusses 2016), catalysis (Feng et al. 2015),
and biological filtration (Munoz et al. 2015). Photocatalytic
technology using TiO
as catalyst has drawn increasing atten-
tion because this technique exhibits low toxicity, stability, and
large bandgap. However, the low mineralization efficiency of
this technique hinders its practical application to VOC pollu-
tion control (Costarramone et al. 2015; Hay et al. 2015).
The photocatalytic degradation of VOCs can be divided
into three processes: (i) adsorption of VOCs on the catalyst
surface, (ii) reaction of the adsorbed VOC with the photo-
generated charge carriers and active species, and (iii) desorp-
tion of the formed CO
O, and by-products from the cata-
lyst surface to the gas phase. Scholars have focused on im-
proving catalyst photoactivity by metal doping (Pham et al.
2016), non-metal doping (Park et al. 2006), and
heterojunction and homojunction construction (Hou et al.
Environmental Science and Pollution Research (2018) 25:15662–15670
Responsible editor: Suresh Pillai
Electronic supplementary material The online version of this article
(https://doi.org/10.1007/s11356-018-1767-y) contains supplementary
material, which is available to authorized users.
* Jinze Lyu
School of Environment and Civil Engineering, Jiangnan University,
Wuxi 214122, Jiangsu, China
Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan
University, Wuxi 214122, Jiangsu, China