Kinetic Model for Simultaneous Adsorption/Photodegradation Process of Alizarin Red S in Water Solution by Nano-TiO2 under Visible Light

Giovannetti, Rita; Rommozzi, Elena; D’Amato, Chiara Anna; Zannotti, Marco

doi:10.3390/catal6060084

Cited by 18 publications

(14 citation statements)

References 26 publications

(32 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our previous studies regarded the preparation of Polypropylene (PP) coated with only TiO 2 , TiO 2 in combination with graphene and with gold nanoparticles and their application in the visible light photodegradation of Alizarin Red S (1,2-dihydroxy-9,10-anthraquinonesulfonic acid sodium salt or ARS) obtaining highly efficient dye degradation with an easy separation of the photocatalyst from the solution [ 29 , 30 , 31 , 32 ]. ARS is a widely used synthetic water soluble dye considered a refractory pollutant because of the difficulty in removing it through general treatments [ 29 , 30 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Band Gap Implications on Nano-TiO2 Surface Modification with Ascorbic Acid for Visible Light-Active Polypropylene Coated Photocatalyst

et al. 2018

Self Cite

View full text Add to dashboard Cite

The effect of surface modification using ascorbic acid as a surface modifier of nano-TiO2 heterogeneous photocatalyst was studied. The preparation of supported photocatalyst was made by a specific paste containing ascorbic acid modified TiO2 nanoparticles used to cover Polypropylene as a support material. The obtained heterogeneous photocatalyst was thoroughly characterized (scanning electron microscope (SEM), RAMAN, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), and Diffuse Reflectance Spectra (DRS) and successfully applied in the visible light photodegradation of Alizarin Red S in water solutions. In particular, this new supported TiO2 photocatalyst showed a change in the adsorption mechanism of dye with respect to that of only TiO2 due to the surface properties. In addition, an improvement of photocatalytic performances in the visible light photodegration was obtained, showing a strict correlation between efficiency and energy band gap values, evidencing the favorable surface modification of TiO2 nanoparticles.

show abstract

Section: Introductionmentioning

confidence: 99%

Band Gap Implications on Nano-TiO2 Surface Modification with Ascorbic Acid for Visible Light-Active Polypropylene Coated Photocatalyst

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, the effect of illumination intensity on adsorption equilibrium coefficient of gaseous pollutant was neglected in most articles. In liquid phase photocatalysis, some authors have reported their research on the effect of the illumination intensity on both the photoreaction coefficient and the adsorption coefficient [26][27][28][29]. Du [30] found that the value of the adsorption coefficient calculated from the L-H model was illumination intensity-dependent in photodegradation of liquid dimethyl phthalate (DMP).…”

Section: Introductionmentioning

confidence: 99%

Modification to L-H Kinetics Model and Its Application in the Investigation on Photodegradation of Gaseous Benzene by Nitrogen-Doped TiO2

et al. 2018

View full text Add to dashboard Cite

In this paper, the Langmuir-Hinshelwood (L-H) model has been used to investigate the kinetics of photodegradation of gaseous benzene by nitrogen-doped TiO 2 (N-TiO 2 ) at 25 • C under visible light irradiation. Experimental results show that the photoreaction coefficient k pm increased from 3.992 × 10 −6 mol·kg −1 ·s −1 to 11.55 × 10 −6 mol·kg −1 ·s −1 along with increasing illumination intensity. However, the adsorption equilibrium constant K L decreased from 1139 to 597 m 3 ·mol −1 when the illumination intensity increased from 36.7 × 10 4 lx to 75.1 × 10 4 lx, whereas it was 2761 m 3 ·mol −1 in the absence of light. This is contrary to the fact that K L should be a constant if the temperature was fixed. This phenomenon can be attributed to the breaking of the adsorption-desorption equilibrium by photocatalytically decomposition. To compensate for the disequilibrium of the adsorption-desorption process, photoreaction coefficient k pm was introduced to the expression of K L and the compensation form was denoted as K m . K L is an indicator of the adsorption capacity of TiO 2 while K m is only an indicator of the coverage ratio of TiO 2 surface. The modified L-H model has been experimentally verified so it is expected to be used to predict the kinetics of the photocatalytic degradation of gaseous benzene.

show abstract

“…Dyes are generally resistant to light and moderate oxidative agents. Without proper treatment, these dyes can be stable in the water for a much longer period of time [4].…”

Section: Introductionmentioning

confidence: 99%

“…A number of physical and physicochemical technologies have been developed for the removal of dyes from aqueous solutions, including adsorption techniques [3,4], membrane processes [5,6], and degradation of dyes through oxidation under the assistant of catalysts [7][8][9][10]. Various materials have been used as adsorbents for the removal of dyes, such as biocoagulants [1], fruit peels [3], and cellulose-based bioadsorbents [4].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Core-Shell MnO2-SiO2 Nanorods for Catalyzing the Removal of Dyes from Water

Gong

Meng

2017

Catalysts

View full text Add to dashboard Cite

This work presented a novel core-shell MnO 2 @m-SiO 2 for catalyzing the removal of dyes from wastewater. MnO 2 nanorods were sequentially coated with polydopamine (PDA) and polyethyleneimine (PEI) forming MnO 2 @PDA-PEI. By taking advantage of the positively charged amine groups, MnO 2 @PDA-PEI was further silicificated, forming MnO 2 @PDA-PEI-SiO 2 . After calcination, the composite MnO 2 @m-SiO 2 was finally obtained. MnO 2 nanorod is the core and mesoporous SiO 2 (m-SiO 2 ) is the shell. MnO 2 @m-SiO 2 has been used to degrade a model dye Rhodamine B (RhB). The shell m-SiO 2 functioned to adsorb/enrich and transfer RhB, and the core MnO 2 nanorods oxidized RhB. Thus, MnO 2 @m-SiO 2 combines multiple functions together. Experimental results demonstrated that MnO 2 @m-SiO 2 exhibited a much higher efficiency for degradation of RhB than MnO 2 . The RhB decoloration and degradation efficiencies were 98.7% and 84.9%, respectively. Consecutive use of MnO 2 @m-SiO 2 has demonstrated that MnO 2 @m-SiO 2 can be used to catalyze multiple cycles of RhB degradation. After six cycles of reuse of MnO 2 @m-SiO 2 , the RhB decoloration and degradation efficiencies were 98.2% and 71.1%, respectively.

show abstract

Kinetic Model for Simultaneous Adsorption/Photodegradation Process of Alizarin Red S in Water Solution by Nano-TiO2 under Visible Light

Cited by 18 publications

References 26 publications

Band Gap Implications on Nano-TiO2 Surface Modification with Ascorbic Acid for Visible Light-Active Polypropylene Coated Photocatalyst

Band Gap Implications on Nano-TiO2 Surface Modification with Ascorbic Acid for Visible Light-Active Polypropylene Coated Photocatalyst

Modification to L-H Kinetics Model and Its Application in the Investigation on Photodegradation of Gaseous Benzene by Nitrogen-Doped TiO2

Core-Shell MnO2-SiO2 Nanorods for Catalyzing the Removal of Dyes from Water

Contact Info

Product

Resources

About