Adsorption and photocatalytic performance of bentonite-titanium dioxide composites for methylene blue and rhodamine B decoloration

Livy Laysandra; Meri Winda Masnona Kartika Sari; Felycia Edi Soetaredjo; Kuncoro Foe; Jindrayani Nyoo Putro; Alfin Kurniawan; Yi-Hsu Ju; Suryadi Ismadji

doi:10.1016/j.heliyon.2017.e00488

Adsorption and photocatalytic performance of bentonite-titanium dioxide composites for methylene blue and rhodamine B decoloration

Heliyon. 2018 Jan 11;3(12):e00488. doi: 10.1016/j.heliyon.2017.e00488. eCollection 2017 Dec.

Authors

Livy Laysandra¹, Meri Winda Masnona Kartika Sari¹, Felycia Edi Soetaredjo¹, Kuncoro Foe², Jindrayani Nyoo Putro³, Alfin Kurniawan³, Yi-Hsu Ju³, Suryadi Ismadji¹

Affiliations

¹ Department of Chemical Engineering, Widya Mandala Surabaya Catholic University, Kalijudan 37, Surabaya 60114, Indonesia.
² Faculty of Pharmacy, Widya Mandala Surabaya Catholic University, Pakuwon City, Kalisari 1, Surabaya 60112, Indonesia.
³ Department of Chemical Engineering, National Taiwan University of Science and Technology, No. 43, Sec 4, Keelung Rd, Da'an District, Taipei City 106, Taiwan.

Abstract

Bentonite - TiO₂ composites were prepared by impregnation of TiO₂ and bentonite, followed by microwave irradiation processes. The composites were characterized using FTIR, SEM, XRD, and nitrogen sorption methods. Anatase phase of TiO₂ in all composites are observed through XRD diffraction peaks and surface morphology of the composites. The adsorption and photocatalytic capabilities of the composites were tested in liquid phase adsorption of methylene blue and Rhodamine B. The adsorption and photocatalytic degradation experiments were conducted in the presence or absence of UV light irradiation. Langmuir and Freundlich models were employed to correlate the experimental adsorption data, and it was found that Langmuir gave better performance in correlating the experimental data. Modification of Langmuir equation to accommodate photocatalytic degradation process was conducted, and the model could represent the experimental results very well.

Keywords: Environmental science, Materials science, Chemical engineering.