TY - JOUR
T1 - Fundamental insights into ciprofloxacin adsorption by sulfate-reducing bacteria sludge
T2 - Mechanisms and thermodynamics
AU - Zhang, Huiqun
AU - Khanal, Samir Kumar
AU - Jia, Yanyan
AU - Song, Shiliu
AU - Lu, Hui
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/12/15
Y1 - 2019/12/15
N2 - Adsorption plays an important role on ciprofloxacin (CIP) removal in biological wastewater treatment systems. In this study, mechanisms and thermodynamics of CIP adsorption by sulfate-reducing bacteria (SRB) sludge were examined via a series of batch studies. CIP adsorption by SRB sludge was a pH-dependent process and was strongly correlated with CIP speciation and SRB sludge properties via multiple adsorption mechanisms including electrostatic attraction, cation exchange and bridging, π-π interaction and hydrogen bond. The presence of cations such as Cu(II) and Fe(III) significantly improved the CIP adsorption onto SRB sludge via surface complexation (coordination and chelation) at neutral (7.0) and acidic (4.0) pH conditions. The functional groups C–O, C–O–C, N–H, O–H and COOH on SRB sludge surface provided binding sites for CIP adsorption via π-π interaction, hydrogen bond and surface complexation as evident from Fourier Transform Infrared (FTIR) spectroscopy analysis. The adsorption of CIP onto SRB sludge was a spontaneous, exothermic and linear adsorption process that included both physisorption and chemisorption. The findings of this study provided insights into the mechanisms and thermodynamics of CIP adsorption by SRB sludge, and have significant potential of applying SRB sludge system for the treatment of CIP-laden wastewaters.
AB - Adsorption plays an important role on ciprofloxacin (CIP) removal in biological wastewater treatment systems. In this study, mechanisms and thermodynamics of CIP adsorption by sulfate-reducing bacteria (SRB) sludge were examined via a series of batch studies. CIP adsorption by SRB sludge was a pH-dependent process and was strongly correlated with CIP speciation and SRB sludge properties via multiple adsorption mechanisms including electrostatic attraction, cation exchange and bridging, π-π interaction and hydrogen bond. The presence of cations such as Cu(II) and Fe(III) significantly improved the CIP adsorption onto SRB sludge via surface complexation (coordination and chelation) at neutral (7.0) and acidic (4.0) pH conditions. The functional groups C–O, C–O–C, N–H, O–H and COOH on SRB sludge surface provided binding sites for CIP adsorption via π-π interaction, hydrogen bond and surface complexation as evident from Fourier Transform Infrared (FTIR) spectroscopy analysis. The adsorption of CIP onto SRB sludge was a spontaneous, exothermic and linear adsorption process that included both physisorption and chemisorption. The findings of this study provided insights into the mechanisms and thermodynamics of CIP adsorption by SRB sludge, and have significant potential of applying SRB sludge system for the treatment of CIP-laden wastewaters.
KW - Adsorption mechanisms
KW - Antibiotics
KW - Ciprofloxacin
KW - Sulfate-reducing bacteria (SRB)
KW - Thermodynamics
UR - https://www.webofscience.com/wos/woscc/full-record/WOS:000487764800041
UR - https://openalex.org/W2953594100
UR - https://www.scopus.com/pages/publications/85068217109
U2 - 10.1016/j.cej.2019.122103
DO - 10.1016/j.cej.2019.122103
M3 - Journal Article
SN - 1385-8947
VL - 378
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 122103
ER -
