Photocatalytic destruction of gaseous toluene by porphyrin-sensitized TiO2 thin films

Yao, Pin-Chuan; Hang, Shih-Tse; Lin, Chi‐Wen; Hai, Dao-Hong

doi:10.1016/j.jtice.2010.08.013

Cited by 14 publications

(4 citation statements)

References 62 publications

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“…Most of the work performed so far has been focusing on very few systems, in particular porphyrin derivatives on TiO 2 surfaces and particles . In most of this work, the focus was set on photocatalysis, and photovoltaics, as well as interaction mechanisms and film growth. Thermal behavior of the materials was only marginally addressed.…”

Section: Introductionmentioning

confidence: 99%

Thermally Activated Self‐metalation of Carboxy‐functionalized Porphyrin Films on MgO Nanocubes

et al. 2018

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We investigated the adsorption of different free-base carboxyl-functionalized porphyrins, 5,10,15,20-tetrakis(4-carboxyphenyl)-21,23H-porphyrin (2H-TCPP) and 5(4-carboxyphenyl)-10,15,20-triphenyl-21,23H-porphyrin (2H-MCTPP), on MgO nanocubes combining IR, UV/Vis and photoluminescence emission spectroscopy. The thermal behavior of the films was monitored in-situ during annealing. Both porphyrins bind to the nanocubes via one and two acid groups respectively, yielding monolayer films consisting of tilted molecules. For 2H-TCPP, two acid groups remain free and give rise to a characteristic IR band. Self-assembly in a tilted adsorbate layer suppresses metalation at room temperature, in contrast to non-functionalized 2H-TPP, which adsorbs flat-lying. Upon heating, 2H-MCTPP undergoes full metalation at temperatures below 280 °C, whereas 2H-TCPP does not metalate at all. The hindered metalation reaction is attributed to the rigidity of the adsorbate film preventing complexation. Our results show that the properties of porphyrin films on oxides can be tuned in a wide range via the position and arrangement of carboxyl anchoring groups.

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Section: Introductionmentioning

confidence: 99%

Thermally Activated Self‐metalation of Carboxy‐functionalized Porphyrin Films on MgO Nanocubes

et al. 2018

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“…5. The anatase characteristic peaks appear at 2θ = 25.5°, 37.9°, 48.1°, 53.9°, and 55.2° while those of rutile are at 2θ = 27.5°, 36.1°, and 54.50° [10,37]. From this figure, the well crystallized of both anatase and rutile forms were observed in all the TNR hybrid sheets (in Fig.…”

Section: Xrd Characterization Of Tnr Hybrid Sheetsmentioning

confidence: 89%

High photocatalytic performance of 3D porous-structured TiO2@natural rubber hybrid sheet on the removal of indigo carmine dye in water

2019

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Due to the high efficiency of photocatalytic process for the environmental treatments, titanium dioxide (TiO 2 ) is a popular used as photocatalyst material. However, the practical uses of TiO 2 in powder form have some drawbacks as well as the difficult reusability. In this work, 3D porous-structured TiO 2 @natural rubber (TNR) hybrid sheets with high photocatalytic performance were presented. TNR hybrid sheets prepared by a facile and low-cost method, which is based on the mixing of natural rubber (NR) latex (60% high ammonia) and ammoniacal TiO 2 (P25) suspension, followed by vacuum filtration through a sintered glass template to make a 3D porous network structure on the surface of the sheets. The obtained TNR sheet samples were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDX), X-ray diffractometer (XRD) and reflection Fourier transformed infrared spectroscopy (FT-IR) techniques. The results showed that the surface morphologies of TNR hybrid sheets appeared as porous-structured which had high roughness and with various tiny pores on the surface. The photocatalytic properties of the prepared TNR hybrid sheets were tested using indigo carmine (IC) dye under UV light irradiation. It was found that the highest photodegradation efficiency was achieved with the TNR_5 wt% hybrid sheet sample. Compared with the sheets reported in previous works, the TNR sheet shows higher efficiencies than those sheets due to its higher amount of TiO 2 particles at the surface, more porous structure with high rough surface, and abundance of tiny pores on the TNR sheet surface. Moreover, the recyclability and stability of TNR sheet indicated that upon using 10 cycles (remains 98% efficiency), in which the stability of the sheet surface well-confirmed by SEM and XRD techniques, as well. From above the study, this 3D porous-structured TNR hybrid sheet could be a new alternative strategy for the water or wastewater treatment in industry concerning with the easy use, recovery, reusability and stability of the photocatalysts.

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“…Toluene is a typical model compound for photocatalytic oxidation studies of volatile organic compounds. Furthermore, toluene is a practically relevant indoor pollutant [27][28][29][30]. Finally, in our earlier work [4], we have studied the kinetics of toluene oxidation in the same reactor, which provides a reference when mimicking challenging conditions for automated process control (e.g., catalyst deactivation).…”

Section: Introductionmentioning

confidence: 99%

The application of automated feedback and feedforward control to a LED-based photocatalytic reactor

Khodadadian

Garza

Ommen

et al. 2019

Chemical Engineering Journal

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An optimal photon utilization is important for the economic performance of a photocatalytic reactor. However, for the desired reactor performance, it is often difficult to predict the required photon utilization. In this work, automated feedback and feedforward controllers are investigated to maintain the reactor conversion close to a desired value by adjusting the photon irradiance within a LED-based photocatalytic reactor for toluene degradation. The feedback controller was able to control the conversion during a set-point tracking experiment and was able to mitigate the effects of catalyst deactivation in an automated fashion. The feedforward controller was designed based on an empirical steady-state model to mitigate the effect of changing toluene inlet concentration and relative humidity, which were measured input disturbances. The results demonstrated that feedback and feedforward control were complementary and could mitigate the effects of disturbances effectively such that the photocatalytic reactor operated close to desired conditions at all times. The presented work is the first example of how online analytical technologies can be combined with "smart" light sources such as LEDs to implement automated process control loops that optimize photon utilization. Future work may expand on this concept by developing more advanced control strategies and exploring applications in different areas.

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Photocatalytic destruction of gaseous toluene by porphyrin-sensitized TiO2 thin films

Cited by 14 publications

References 62 publications

Thermally Activated Self‐metalation of Carboxy‐functionalized Porphyrin Films on MgO Nanocubes

Thermally Activated Self‐metalation of Carboxy‐functionalized Porphyrin Films on MgO Nanocubes

High photocatalytic performance of 3D porous-structured TiO2@natural rubber hybrid sheet on the removal of indigo carmine dye in water

The application of automated feedback and feedforward control to a LED-based photocatalytic reactor

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