Livy Laysandra, Felix Harijaya Santosa, Vic Austen, Felycia Edi Soetaredjo, Kuncoro Foe, Jindrayani Nyoo Putro, Yi-Hsu Ju, Suryadi Ismadji
This paper presents the preparation of composite material and its application for the adsorption of crystal violet and Cr(VI) from aqueous solution onto acid-activated bentonite (AAB) and rarasaponin–bentonite-activated biochar from durian shells composite (RBAB). The influence of initial pH of the solution and the temperature of adsorption on the adsorbents adsorption performance was also studied. Langmuir and Freundlich models could represent the adsorption equilibria equally well. Thermodynamic parameters such as ∆G°, ∆H°, and ∆S° were evaluated based on the adsorption isotherms. The values of ∆G°, ∆H°, and ∆S° for crystal violet adsorption system demonstrate behavior contrary to the Cr(VI) adsorption system. Where crystal violet adsorption is preferred at high temperatures with qmax, value is 518.64 mg/L; while adsorption Cr(VI) is better at low temperature with qmax, value is 106.30 mg/L. Pseudo-first-order and pseudo-second-order kinetic models could represent the kinetic data well. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
Department of Chemical Engineering, Widya Mandala Surabaya Catholic University, Kalijudan 37, Surabaya, 60114, Indonesia; Intan Permata Hati, Raya Kedung Baruk No.112 – 114, Surabaya, 60298, Indonesia; Widya Mandala Surabaya Catholic University, Pakuwon City, Kalisari 1, Surabaya, 60112, Indonesia; Department of Chemical Engineering, National Taiwan University of Science and Technology, No. 43, Sec 4, Keelung Rd, Da’an District, Taipei City, 106, Taiwan; Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, No. 43, Sec 4, Keelung Rd,. Da’an District, Taipei City, 106, Taiwan