A novel mixed-phase TiO2/kaolinite composites and their photocatalytic activity for degradation of organic contaminants

Zhang, Yalei; Gan, Hao; Zhang, Gaoke

doi:10.1016/j.cej.2011.07.005

Cited by 144 publications

(75 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Binary and ternary mixed TiO 2 phases supported on kaolinite were synthesized by introducing polymeric Ti cations into the layered aluminosilicate by hydrolysis of TiCl 4 in HCl [179]. The as-prepared samples exhibited strong photocatalytic activity for the removal of acid red G and 4-nitrophenol due to the synergetic effects of the adsorbibility of kaolinite and the catalytic ability of TiO 2 .…”

Section: Mixtures Of Brookite With Anatase And/or Rutilementioning

confidence: 99%

Brookite, the Least Known TiO2 Photocatalyst

2013

View full text Add to dashboard Cite

Abstract:Brookite is the least studied TiO 2 photocatalyst due to the difficulties usually encountered in order to obtain it as a pure phase. In this review, a comprehensive survey of the different methods available for preparing brookite powders and films is reported. Attention has been paid both to the most traditional methods, such as hydrothermal processes at high temperatures and pressures, and to environmentally benign syntheses using water soluble compounds and water as the solvent. Papers reporting the photocatalytic activity of pure and brookite-based samples have been reviewed.

show abstract

Section: Mixtures Of Brookite With Anatase And/or Rutilementioning

confidence: 99%

Brookite, the Least Known TiO2 Photocatalyst

2013

View full text Add to dashboard Cite

show abstract

“…The pH of the reaction mixture in heterogeneous photocatalysis plays a signicant role because it dictates the surface charge properties of the catalysts and adsorption behavior of the pollutants on the surface of catalysts. [51][52][53][54] The effect of pH on degradation of MB in the presence of Nd-ZnO was studied in the pH range of 5-11. The pH of the reaction mixture was adjusted at the start of the irradiation and not maintained throughout the course of the reaction.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Comparative photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes

et al. 2018

View full text Add to dashboard Cite

Rare earth metal doping into semiconductor oxides is considered to be an effective approach to enhance photocatalytic activity due to its ability to retard the electron-hole pair recombination upon excitation.Herein, we report the synthesis of different rare earth metal (La, Nd, Sm and Dy)-doped ZnO nanoparticles using a facile sol-gel route followed by evaluation of their photocatalytic activity by studying the degradation of methylene blue (MB) and Rhodamine B (RhB) under UV-light irradiation.Different standard analytical techniques were employed to investigate the microscopic structure and physiochemical properties of the prepared samples. The formation of the hexagonal wurtzite structure of ZnO was established by XRD and TEM analyses. In addition, the incorporation of rare earth metal into ZnO is confirmed by the shift of XRD planes towards lower theta values. All metal doped ZnO showed improved photocatalytic activity toward the degradation of MB, of which, Nd-doped ZnO showed the best activity with 98% degradation efficiency. In addition, mineralization of the dye was also observed, indicating 68% TOC removal in 180 min with Nd-doped ZnO nanoparticles. The influence of different operational parameters on the photodegradation of MB was also investigated and discussed in detail.Additionally, a possible photocatalytic mechanism for degradation of MB over Nd-doped ZnO nanoparticles has been proposed and involvement of hydroxyl radicals as reactive species is elucidated by radical trapping experiments.

show abstract

“…Various methods of preparing TiO 2 /KLT have been reported, including the use of TiCl 4 [16][17][18] or Ti(IV) alkoxides-i.e., Ti(IV) propoxide [19] or Ti(IV) butoxide [14,20]-as precursors. Moreover, chemical or thermal pretreatment of KLT is commonly used [14,16,17,20].…”

Section: Introductionmentioning

confidence: 99%

Structure and stability of kaolinite/TiO2 nanocomposite: DFT and MM computations

2011

View full text Add to dashboard Cite

The adhesion of TiO(2) (anatase structure) nanoparticles to kaolinite substrate was investigated using molecular modeling. Universal force field computation, density function theory computation, and a combination of both two approaches were used. This study enabled the adhesion energy for the TiO(2)/kaolinite nanocomposite to be estimated, and revealed the preferred orientation of the TiO(2) nanoparticles on the kaolinite substrate. The results of all three levels of computation were compared in order to show that the accuracy of universal force field computations is sufficient in this context. The role of nanoparticle size and the importance of the nanoparticle-substrate bonding contribution are presented here and discussed. A comparison of the molecular modeling results with scanning electron microscopy observations showed that the results of the modeling were consistent with the experimental data, and that this approach can be used to help characterize nanocomposites of the nanoparticle/phyllosilicate substrate type.

show abstract

A novel mixed-phase TiO2/kaolinite composites and their photocatalytic activity for degradation of organic contaminants

Cited by 144 publications

References 61 publications

Brookite, the Least Known TiO2 Photocatalyst

Brookite, the Least Known TiO2 Photocatalyst

Comparative photocatalytic activity of sol–gel derived rare earth metal (La, Nd, Sm and Dy)-doped ZnO photocatalysts for degradation of dyes

Structure and stability of kaolinite/TiO2 nanocomposite: DFT and MM computations

Contact Info

Product

Resources

About