Dephosphatation under UV light of water by Ti-PILC with activation by secondary species (La, Se, and Rb)

详细信息    查看全文

• 作者：Siham Barama^a ; ^{siham_barama@yahoo.com} ; Anne Davidson^b ; ^{anne.davidson@upmc.fr} ; Akila Barama^a ; Hamza Boukhlouf^a ; Sandra Casale^b ; ^c ; Christophe Calers^b ; Dalil Brouri^b ; ^c ; Cyril Domingos^b ; Amar Djadoun^d
• 关键词：Montmorillonite clay ; Ti pillared clay ; TiO2 nanoflowers ; UV photocatalysis ; Dephosphatation ; Oxygen adsorbed species
• 刊名：Comptes Rendus Chimie
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：20
• 期：1
• 页码：7-19
• 全文大小：2728 K
• 卷排序：20

文摘

Me/Ti-PILC catalysts (Me: La, Se, Rb) were prepared with 60% in weight of Ti-species and 3% in weight of Me-secondary species added under ultrasounds. All materials were characterized by XRF, XPS, XRD, BET, HR-TEM/EDS, FEG-SEM and UV-vis. Three kinds of Ti-oxide nanoparticles were identified: (1) Ti-pillars within the clay layers, (2) rutile nanoflowers, and (3) anatase. In UV-vis spectra, no significant change in the band-gap was observed. In La and Se samples, small variations of the anatase XRD lines are associated with cationic diffusion after deposition of secondary species and calcination. An O1s XPS-peak (533.5 eV) is attributed to oxygen vacancies generated by this diffusion. Phosphate photo-removal in water was studied using phosphoric acid solution (75.97 g L−1). Dephosphatation is significantly improved in the presence of Me-species as La/Ti-PILC > Se/Ti-PILC > Rb/Ti-PILC > Ti-PILC. Partial dephosphatation by adsorption is possible in the dark but is strongly improved by UV irradiation. With a La catalyst and under UV irradiation, phosphates (6.6 × 10−3 mol L−1) were recovered in less than 70 min. Therefore, Me/Ti-PILC have a great potential as photocatalysts for the treatment of wastewaters and the recovery of phosphates.