Titania-triethanolamine-kaolinite nanocomposites as adsorbents and photocatalysts of herbicides

Author(s)

Piza Figueiredo Ferreira, Ana Vera de Toledo ^[1] ; Vietro Barbosa, Lorrana ^[1] ; Delfino de Souza, Suelen ^[1] ; Jorge Ciuffi, Katia ^[2] ; Angel Vicente, Miguel ^[2] ; Trujillano, Raquel ^[2] ; Korili, Sophia A. ^[3] ; Gil, Antonio ^[3] ; Henrique de Faria, Emerson ^[1]

Affiliation

^[1] Univ Franca, UNIFRAN Grp Pesquisa Mat Lamelares Hibridos GPMat, Av Dr Armando Salles Oliveira 201, Parque Univ, BR-14404600 Franca, SP - Brazil

^[2] Univ Salamanca, Dept Quim Inorgan, GIR QUESCAT, Fac Ciencias Quim, Plaza Caidos S-N, Salamanca 37008 - Spain

^[3] Univ Publ Navarra, Dept Ciencias, INAMAT2, Campus Arrosadia, Pamplona 31006 - Spain

• Document type: Journal article
• Source: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY; v. 419, OCT 1 2021.
• Web of Science Citations: 0

Abstract

Kaolinite-titania adsorbents/photocatalysts were prepared by functionalizing a kaolinite with titanium(IV) triethanolaminate isopmpoxide by the sol-gel route. These materials were characterized by various techniques and applied in adsorption studies (kinetic and equilibrium) of the herbicides diuron, hexazinone, and tebuthiuron. Photodegradation studies were also conducted with the materials submitted to heat-treatment at 400, 700, or 1000 degrees C. The basal spacing increased from 0.71 to 1.08 nm when pure kaolinite was functionalized with titanium triethanolaminate units. The materials displayed FTIR bands of -CH, -NH2, and Ti-OH groups, thereby confirming that titanium alkoxide was present in the kaolinite interlayer space. The pseudo second-order model was the best for describing the kinetic adsorption process. In the equilibrium study, the Langmuir model best described the adsorption mechanism. The photodegradation studies showed that the kaolinite-titania nano-composites heat-treated at 400 and 700 degraded diuron, hexazinone, and tebuthiumn efficiently due to the presence of metakaolin and formation of the anatase phase. (AU)

• FAPESP's process: 12/11673-3 - Thin films obtained by spin and dip-coating using sol-gel methodology
• Grantee: Eduardo José Nassar
• Support type: Regular Research Grants
• FAPESP's process: 13/19523-3 - Functional Biohybrid materials based on layered and/or fibrous natural clays with multifaceted applications
• Grantee: Emerson Henrique de Faria
• Support type: Regular Research Grants
• FAPESP's process: 17/15482-1 - Novel strategies synthesis to reuse Tanner industry by-products to obtain high-value functional porous materials
• Grantee: Emerson Henrique de Faria
• Support type: Regular Research Grants