Adsorption properties of arsenic on sulfated TiO2 adsorbents

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) Vol. 80; pp. 444 - 449
• Main Authors: Lee, Sang Hyun, Jang, Young Hee, Nguyen, Dinh Duc, Chang, Soon Woong, Kim, Sung Chul, Lee, Sang Moon, Kim, Sung Su
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.12.2019; 한국공업화학회
• Subjects: Adsorption; Arsenic; Electron density; Titania; Wetness impregnation method; 화학공학; Wetness impregnation method; Arsenic; Adsorption; Titania; Electron density
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2019.08.024

[Display omitted] •Sulfated/Ti(OH)4 were prepared by impregnation method.•Arsenic adsorption ability of sulfated/Ti(OH)4 was increased by 20% compared with that of TiO2.•Lewis and Bronsted acid sites were increased for sulfated/TiO2(B). Adsorption technologies are considered to be cost-effective solutions for the removal of toxic residues. In the present study, two types of sulfated TiO2 adsorbents, sulfated–TiO2(A) and sulfated–TiO2(B), were prepared by the wetness impregnation method, and tested for how effectively they could bind to, and hence, remove arsenic. These adsorbents were characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). The interaction of the arsenic with the sulfate group at the surface of the adsorbent can be deduced by the reduction in the peak intensity of the SO bond at 1219 cm−1, corresponding to the SO42− group. In particular, the number of Lewis and Brønsted acid sites was enhanced in the sulfated–Ti(OH)4 adsorbents, which modulated the surface acidity of titania by controlling the electron density and facilitated the adsorption of arsenic. Our results confirmed that sulfated–TiO2(B) is 20% more efficient at removing arsenic, as compared to TiO2 (60%) and Ti(OH)4 (64%).