Exceptional visible-light-induced photocatalytic activity of attapulgite–BiOBr–TiO2 nanocomposites

• Published in: Applied clay science Vol. 90; pp. 135 - 140
• Main Authors: Zhang, Jiahui, Zhang, Lili, Lv, jinshun, Zhou, Shouyong, Chen, Haiqun, Zhao, Yijiang, Wang, Xin
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01.03.2014; Elsevier
• Subjects: Attapulgite; BiOBr–TiO2; Earth sciences; Earth, ocean, space; Exact sciences and technology; In-situ depositing technique; Mineralogy; Silicates; Visible-light photocatalysis; In-situ depositing technique; Attapulgite; Visible-light photocatalysis; BiOBr–TiO2; scanning electron microscopy; oxides; aggregation; degradation; exhibits; transmission electron microscopy; particles; BiOBr-TiO; in situ
• ISSN: 0169-1317; 1872-9053
• DOI: 10.1016/j.clay.2013.12.037

A novel and efficient visible-light-responsive attapulgite composite photocatalyst was fabricated by introducing BiOBr–TiO2 hybrid oxides onto its surface using in-situ depositing technique (marked as ATT–BiOBr–TiO2). ATT–BiOBr–TiO2 nanocomposites with different molar ratios of r (r=nTi/(nTi+nBi) were studied in order to achieve the best photocatalyst. The obtained samples were characterized by XRD, TEM, SEM and BET measurements. It was shown that BiOBr–TiO2 nanocomposite particles with average size of 10nm were introduced onto attapulgite fibers' surface without obvious aggregation. Compared with ATT, ATT–TiO2, ATT–BiOBr and BiOBr–TiO2, ATT–BiOBr–TiO2 exhibits exceptional visible-light photocatalytic activity in degradation of 20mg·L−1 methyl orange. The photodecomposition % of methyl orange increased along with the increasing content of TiO2 in the case of r≤0.83 and decreased as r>0.83. 96.80% of methyl orange was removed by using ATT–BiOBr–TiO2 (r=0.83) within 120min. Possible mechanism was put forward. •Efficient visible-light-induced attapulgite composite photocatalyst was fabricated.•Highly dispersive BiOBr-TiO2 was introduced onto attapulgite’s surface.•Attapulgite -BiOBr-TiO2 shows superior visible light photocatalytic activity.•We report a possible mechanism for this enhancement.