Photocatalytic degradation of a cationic azo dye by TiO2/bentonite nanocomposite

Sun, Zhonghui; Chen, Yingxu; Ke, Qiang; Yang, Ye; Yuan, Jun

doi:10.1016/s1010-6030(01)00649-9

Cited by 230 publications

(82 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This effect can be explained by assuming a competition between reaction intermediates and substrate for the active centers of photocatalysts. 52 The importance of benzylamine and aniline pre-adsorption on photocatalysts can be proved by a modified Langmuir-Hinshelwood (L-H) kinetic model [53][54][55] to accommodate the reaction occurring at a solid-liquid interface. In this model the rate of reaction (R L-H ) is proportional to the surface coverage θ (Eq.5):…”

Section: Flow Rate Of Oxygen Gasmentioning

confidence: 99%

The Effects of Some Operational Parameters in Photodegradation of Benzylamine and Aniline and Their Kinetics in Aqueous Suspension of TiO₂ and Pt–Loaded TiO₂

et al. 2007

View full text Add to dashboard Cite

Photocatalytic degradation of benzylamine and aniline on TiO2, Pt-modified TiO2, ZnO and ZnS in aqueous solution has been investigated. The degradation of the compounds follows a pseudo-first-order kinetics according to Langmuir-Hinshelwood model. The degradation process of benzylamine and aniline was evaluated by ninhydrin spectrophotometric method using UV-visible spectrophotometer in lambda(max) = 538 and 525 nm, respectively. The results showed the order of Pt/TiO2 > TiO2 > ZnO > ZnS for photocatalytic activity. In addition increasing of the Pt-loading was found to enhance the degradation rate of the compounds up to the optimal amount of 5 wt. % onto the surface of TiO2 so that the rates of degradation were increased about two times. Rate constants for photodegradation of benzylamine and aniline were found to be 1.4 x 10(-3) min(-1) and 0.7 x 10(-3) min(-1) for TiO2 as photocatalyst, while 2.7 x 10(-3) min(-1) and 1.7 x 10(-3) min(-1) for (5 wt.%) Pt/TiO2 as photocatalyst. Running the reactions in various pH (5-11), indicated that the pH = 8 and 10 or Higher are the optimum pH for photocatalytic degradation of benzylamine and aniline respectively. The effects of some other parameters such as amount of photocatalyst, flux of oxygen and irradiation time were evaluated. Furthermore, the Langmuir-Hinshelwood rate constant k(r) and adsorption constant K(A) for the titled compounds are reported.

show abstract

Section: Flow Rate Of Oxygen Gasmentioning

confidence: 99%

The Effects of Some Operational Parameters in Photodegradation of Benzylamine and Aniline and Their Kinetics in Aqueous Suspension of TiO₂ and Pt–Loaded TiO₂

et al. 2007

View full text Add to dashboard Cite

show abstract

“…Isoproturon is one of the most used herbicides in Europe and due to its water solubility, low chemical and biological degradation it contaminates surface and ground water [9,10]. Heterogenous photocatalysis using TiO2, has been considered as highly promising for waste water treatment and degradation of these herbicides [11,12].…”

Section: Introductionmentioning

confidence: 99%

TiO2 functionalized nanofibrous membranes for removal of organic (micro)pollutants from water

Geltmeyer

Teixido

Meire

et al. 2017

Separation and Purification Technology

View full text Add to dashboard Cite

Abbreviations 1 1 PA 6: polyamide 6, MB: Methylene Blue, IL: inline, DC: dip-coating, H: hydrophilic 2 ABSTRACT Titania has already proven its added value for air and water treatment. The higher the surface-to-volume area, the better the performance of the TiO2 photocatalyst. These nanoparticles are typically applied in a slurry form. The use of titania nanoparticles in suspension has, however, multiple disadvantages such as a high turbidity and complex recovery of the photocatalyst after use. Therefore, immobilization of titania nanoparticles on a porous support such as a nanofibrous membrane, can be highly valuable for water treatment. These TiO2 functionalized nanofibrous membranes may be used not only in a membrane separation reactor, but also in a contact reactor. In this study, TiO2 nanoparticles were immobilized on both polymer (polyamide 6) and ceramic (silica) nanofibrous membranes. Polymer nanofibers are chosen as they are the state-of-the-art material, silica nanofibers on the contrary are less studied but show additional advantages due their excellent chemical and thermal stability and can thus offer a clear benefit for a wider range of applications. Two immobilization techniques were used, namely inline functionalization and dip-coating. Inline functionalization showed to be the preferred method for polyamide 6 nanofibrous membranes, dip-coating for silica nanofibrous membranes. Complete degradation of isoproturon, an actual concern in water treatment, is shown. Even the widely available commercial TiO2 nanoparticles allowed for a complete isoproturon removal as the result of a correct immobilization process on nanofibrous materials. This clearly opens up the high value of TiO2 functionalized nanofibrous membranes for organic (micro)pollutants removal.

show abstract

“…Nanophotocatalysis is one of the most economical and ecofriendly method for the remediation of toxic textile dyes. Degradation of azo dyes using TiO 2 and ZnO composites synthesized via chemical methods is highly efficient than pure TiO 2 and ZnO nanoparticles (Sun et al 2002;Zhang and Zeng 2010). Rate of degradation of dyes is highly affected by the type of composite used.…”

Section: Degradation Of Textile Dyesmentioning

confidence: 99%

Advanced approach for degradation of recalcitrant by nanophotocatalysis using nanocomposites and their future perspectives

Padmanaban¹,

Nandagopal

Priyadharshini³

et al. 2016

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

Industrial effluents containing persistent pollutants play a significant role in environmental pollution. Classical techniques such as chlorination, coagulation, ion flotation, membrane process and sedimentation that have been used to decontaminate polluted water are incapable of efficient degradation due to the generation of secondary pollutants. Photocatalysis, an advanced oxidation process in which the photoreaction is accelerated by the irradiation of catalyst, has shown efficient degradation of recalcitrant in water system. Usage of nanoparticles as homogenous photocatalyst has become prevalent due to their improved properties such as large surface-to-volume ratio, controlled uniform particle size and its composition which enhances the degradation rate. The recombination of holes and electron pair which is considered to be the limitation in homogenous system can be overcome by nanocomposites or heterogeneous photocatalysts. This system decreases the rate of recombination, leading to effective degradation of individual pollutants because of their enhanced physicochemical and structural properties. In recent years, heterogeneous nanophotocatalytic processes employing titanium dioxide (TiO 2 ) and zinc oxide (ZnO) composites have gained immense research interest as an effective wastewater treatment method because of its efficacy in decomposing and mineralizing the hazardous organic and inorganic pollutants utilizing the UV and visible photons.This paper reviews about the process, synthesis and parameters influencing photocatalytic reaction and their kinetics with much emphasize on types of nanoparticles and nanocomposites and its application in wastewater treatment.

show abstract

Photocatalytic degradation of a cationic azo dye by TiO2/bentonite nanocomposite

Cited by 230 publications

References 35 publications

The Effects of Some Operational Parameters in Photodegradation of Benzylamine and Aniline and Their Kinetics in Aqueous Suspension of TiO₂ and Pt–Loaded TiO₂

The Effects of Some Operational Parameters in Photodegradation of Benzylamine and Aniline and Their Kinetics in Aqueous Suspension of TiO₂ and Pt–Loaded TiO₂

TiO2 functionalized nanofibrous membranes for removal of organic (micro)pollutants from water

Advanced approach for degradation of recalcitrant by nanophotocatalysis using nanocomposites and their future perspectives

Contact Info

Product

Resources

About

Photocatalytic degradation of a cationic azo dye by TiO2/bentonite nanocomposite

Cited by 230 publications

References 35 publications

The Effects of Some Operational Parameters in Photodegradation of Benzylamine and Aniline and Their Kinetics in Aqueous Suspension of TiO2 and Pt–Loaded TiO2

The Effects of Some Operational Parameters in Photodegradation of Benzylamine and Aniline and Their Kinetics in Aqueous Suspension of TiO2 and Pt–Loaded TiO2

TiO2 functionalized nanofibrous membranes for removal of organic (micro)pollutants from water

Advanced approach for degradation of recalcitrant by nanophotocatalysis using nanocomposites and their future perspectives

Contact Info

Product

Resources

About

The Effects of Some Operational Parameters in Photodegradation of Benzylamine and Aniline and Their Kinetics in Aqueous Suspension of TiO₂ and Pt–Loaded TiO₂

The Effects of Some Operational Parameters in Photodegradation of Benzylamine and Aniline and Their Kinetics in Aqueous Suspension of TiO₂ and Pt–Loaded TiO₂