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| Soil Components and Cu2+ and Ca2+ Effects on Ciprofloxacin Adsorption by Black Soil |
| Received:June 24, 2015 |
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| KeyWord:ciprofloxacin;Cu;Ca;soil;adsorption |
| Author Name | Affiliation | E-mail | | TAN Yin-yue | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | | XU Jian | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
Nanjing University Jinling College, Nanjing 210089, China | | | GU Xue-yuan | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | xygu@nju.edu.cn | | WANG Xiao-rong | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | | TONG Fei | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | | XIE Jin-yu | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | | JANG Yang | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | |
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| Abstract: |
| Antibiotic contamination in the environment has drawn wide concerns. Its adsorption in soil may affect its fates in soil environment. An experiment was performed to determine the effects of soil components(organic matter, iron oxides) and various environmental factors(pH, Cu2+ and Ca2+) on ciprofloxacin(CIP) adsorption onto a black soil(BS0) using batch adsorption experiment. Adsorption capacity of CIP was BS0>>BS1(organic matter removal)≈BS2(organic matter and iron oxides removal). The maximum Kd value was 9008 L·kg-1, 5063 L·kg-1, and 4583 L·kg-1 for BS0, BS1, and BS2, respectively, indicating that soil organic matter was the main contributor to CIP retention in soil, followed by soil clay minerals. The main adsorption mechanisms of CIP by BS0 were complexation with soil organic matters and cation exchange with clay minerals. Low pH favored CIP adsorption. Divalent cation Cu2+ showed different effects on CIP adsorption, depending on pH:at pH≤6 it slightly depressed CIP adsorption on BS1 and BS2 because of the competition; while at pH>6 it significantly promoted the adsorption. Compared with Cu2+, Ca2+ suppressed CIP adsorption at the tested pH range by acting as a competiting cation. On the other hand, CIP could promote Cu2+ adsorption under acidic condition, which might be a result of forming a “soil-CIP-Cu” ternary surface complex. |
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