TY - JOUR
T1 - Enhancing adsorption performance of alkali activated kaolinite in the removal of antibiotic rifampicin from aqueous solution
AU - Majid, Aisyah Farhanah Abdul
AU - Dewi, Rosmaya
AU - Shahri, Nurulizzatul Ningsheh M.
AU - Shahrin, Ensan Waatriah E.S.
AU - Kusrini, Eny
AU - Shamsuddin, Norazanita
AU - Lim, Jun Wei
AU - Thongratkaew, Sutarat
AU - Faungnawakij, Kajornsak
AU - Usman, Anwar
N1 - Funding Information:
Dr. Eny Kusrini is grateful to Universitas Indonesia for providing research funding under PUTI Q1 2022–2023 No: NKB-503/UN2. RST/HKP.05.00/2022.
Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/11/5
Y1 - 2023/11/5
N2 - In this study, raw kaolin clay was activated with a strong base solution in order to improve its surface characteristics and adsorption performance. The alkali activation evidently caused etching process and ion exchanges of both Al3+ and Si4+ with Na+ on the silica and gibbsite basal surfaces, enhancing the surface area of the kaolinite particles. Adsorption of rifampicin (RIF) on the raw and alkali-activated kaolin was well described by the Langmuir isotherm and the pseudo-second-order kinetics models. The maximum adsorption capacity of RIF on the alkali-activated kaolin was 8.295 mg g−1, enhanced compared with the raw kaolin (5.931 mg g−1). The adsorption was due to weak electrostatic and hydrogen bonding interactions between RIF and the kaolinite surfaces. Adsorption mechanism, kinetics, rate limiting-step, and thermodynamics were described in detail by fitting mathematical functions of the established semiempirical models to the experimental data. The recyclability of the kaolin-based adsorbents was demonstrated by their effective regeneration. Overall, the alkali activation improves the adsorption performance of kaolin to be practically applicable as environmentally friendly and sustainable absorbents for the removal of RIF and probably other pharmaceutical compounds from hospital wastewater.
AB - In this study, raw kaolin clay was activated with a strong base solution in order to improve its surface characteristics and adsorption performance. The alkali activation evidently caused etching process and ion exchanges of both Al3+ and Si4+ with Na+ on the silica and gibbsite basal surfaces, enhancing the surface area of the kaolinite particles. Adsorption of rifampicin (RIF) on the raw and alkali-activated kaolin was well described by the Langmuir isotherm and the pseudo-second-order kinetics models. The maximum adsorption capacity of RIF on the alkali-activated kaolin was 8.295 mg g−1, enhanced compared with the raw kaolin (5.931 mg g−1). The adsorption was due to weak electrostatic and hydrogen bonding interactions between RIF and the kaolinite surfaces. Adsorption mechanism, kinetics, rate limiting-step, and thermodynamics were described in detail by fitting mathematical functions of the established semiempirical models to the experimental data. The recyclability of the kaolin-based adsorbents was demonstrated by their effective regeneration. Overall, the alkali activation improves the adsorption performance of kaolin to be practically applicable as environmentally friendly and sustainable absorbents for the removal of RIF and probably other pharmaceutical compounds from hospital wastewater.
KW - Adsorption
KW - Alkali activation
KW - Kaolin
KW - Pharmaceutical compound
KW - Regeneration
KW - Rifampicin
UR - http://www.scopus.com/inward/record.url?scp=85168546025&partnerID=8YFLogxK
U2 - 10.1016/j.colsurfa.2023.132209
DO - 10.1016/j.colsurfa.2023.132209
M3 - Article
AN - SCOPUS:85168546025
SN - 0927-7757
VL - 676
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
M1 - 132209
ER -