TY - JOUR
T1 - Adsorption of ciprofloxacin on 2:1 dioctahedral clay minerals
AU - Wang, Chih Jen
AU - Li, Zhaohui
AU - Jiang, Wei Teh
N1 - Funding Information:
We are grateful to the reviewers' constructive comments. Funding from National Cheng Kung University (NCKU) for the project of Promoting Academic Excellence & Developing World Class Research Centers to support Li's short term visits to NCKU made this publication possible. We also thank the funding from National Science Council (Taiwan) to Jiang under grant NSC98-2116-M-006-005 and to Wang and Jiang through the Instrument Platform for Enhancing Geochemical Studies ( NSC98-2745-M-002-005 ).
PY - 2011/10
Y1 - 2011/10
N2 - Frequent detection of antibiotics in natural environment and wastewater effluent requires systematic investigations of various clay minerals. Dioctahedral 2:1 clay minerals are major constituents of soil and sediments. Interaction of these clay minerals and ciprofloxacin (CIP) was studied. The CIP adsorption capacities on montmorillonite, rectorite, and illite were 1.19, 0.41, and 0.10. mmol/g, corresponding to 1.0, 1.0, and 0.9 CEC. Desorption of the equivalent amounts of exchangeable cations suggested that the cation exchange was mainly responsible for the CIP adsorption on montmorillonite and rectorite. The expansion of the basal spacing and shifts of characteristic FTIR bands indicated the intercalation of CIP ions with tilted orientation in montmorillonite and rectorite. The displacement of exchangeable cations and associated FTIR band shifts also indicated the cation exchange as important for CIP adsorption on illite but hydrogen bonding between CIP carboxylic groups and basal oxygen atoms on external surface apparently made a significant contribution to the adsorption.
AB - Frequent detection of antibiotics in natural environment and wastewater effluent requires systematic investigations of various clay minerals. Dioctahedral 2:1 clay minerals are major constituents of soil and sediments. Interaction of these clay minerals and ciprofloxacin (CIP) was studied. The CIP adsorption capacities on montmorillonite, rectorite, and illite were 1.19, 0.41, and 0.10. mmol/g, corresponding to 1.0, 1.0, and 0.9 CEC. Desorption of the equivalent amounts of exchangeable cations suggested that the cation exchange was mainly responsible for the CIP adsorption on montmorillonite and rectorite. The expansion of the basal spacing and shifts of characteristic FTIR bands indicated the intercalation of CIP ions with tilted orientation in montmorillonite and rectorite. The displacement of exchangeable cations and associated FTIR band shifts also indicated the cation exchange as important for CIP adsorption on illite but hydrogen bonding between CIP carboxylic groups and basal oxygen atoms on external surface apparently made a significant contribution to the adsorption.
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U2 - 10.1016/j.clay.2011.06.014
DO - 10.1016/j.clay.2011.06.014
M3 - Article
AN - SCOPUS:80051915935
VL - 53
SP - 723
EP - 728
JO - Applied Clay Science
JF - Applied Clay Science
SN - 0169-1317
IS - 4
ER -