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| Use of probing molecules for exploring norfloxacin adsorption mechanisms on bone-derived and wood-derived biochars |
| Received:September 23, 2017 |
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| KeyWord:bone biochar;wood biochar;norfloxacin;probe molecule;adsorption |
| Author Name | Affiliation | E-mail | | CHEN Guang-shi | State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | | | SHI Yan | State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | | | XUE Cong | State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | | | QIU Yu-ping | State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China | ypqiu@tongji.edu.cn |
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| Abstract: |
| Bone biochar(BB) and wood biochar(WB) were prepared by pyrolysis of swine bone and wood strip, respectively, and the adsorption mechanism of norfloxacin(NOR) by BB and WB was studied using elemental analysis, Brunner Emmet Teller-N2, Fourier transform infrared spectroscopy, and X-ray diffraction methods. It was found that BB was mainly composed of calcium hydroxyapatite, containing a small amount of elemental carbon, with a large porosity and a low specific surface area of 142.37 m2·g-1. While microporous WB chiefly consisted of elemental carbon with a large specific surface area of 460.64 m2·g-1. However, the adsorption of norfloxacin on BB was higher than that on WB within the pH range of 2~12. It demonstrated that the elemental carbon played a dominant role on BB adsorption due to the presence of negligible adsorption of NOR on hydroxyapatite. To further explore the adsorption mechanism of NOR by biochars, two probe molecules, including flumequine(FLU) and phenylpiperazine(PHP), were introduced. PHP and NOR had similar piperazinyl groups, whereas FLU and NOR contained similar oxoquinoline carboxylic acid groups. It showed that the adsorption of PHP by BB was lower than that of NOR and FLU, indicating that the oxoquinoline carboxyl groups of NOR played an important role in adsorption. In contrast, the adsorption of the macromolecule NOR was lower than that of smaller molecules, such as PHP and FLU, suggesting a strong steric resistance in the NOR adsorption process. These results were consistent with the kinetic study, in which NOR adsorption by WB took more time to reach equilibrium than that by bone biochar did. |
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