| 陈广世,石炎,薛聪,邱宇平.应用探针分子研究骨炭和木炭吸附诺氟沙星的机理[J].农业环境科学学报,2018,37(3):471-477. |
| 应用探针分子研究骨炭和木炭吸附诺氟沙星的机理 |
| Use of probing molecules for exploring norfloxacin adsorption mechanisms on bone-derived and wood-derived biochars |
| 投稿时间：2017-09-23 |
| DOI：10.11654/jaes.2017-1299 |
| 中文关键词: 骨炭 木炭 诺氟沙星 探针分子 吸附 |
| 英文关键词: bone biochar wood biochar norfloxacin probe molecule adsorption |
| 基金项目:国家自然科学基金项目（21677108）；上海市科委科技基金项目（17DZ1202002） |
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| 摘要点击次数: 2008 |
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| 中文摘要: |
| 分别以猪骨和木材为原料热解制备骨炭和木炭，研究其对抗生素诺氟沙星（NOR）的吸附规律。采用元素分析、BET-N2、红外、XRD等方法对生物炭进行了表征，发现骨炭以羟基磷酸钙成分为主，含少量元素碳，其孔隙大、比表面积小（142.37 m2·g-1）；而木炭主要成分为元素碳，以微孔结构为主，比表面积大（460.64 m2·g-1）。在pH=2~12的范围内，骨炭对NOR的吸附能力强于木炭。鉴于纯羟基磷酸钙（HAP）对NOR的吸附可忽略，因此可以认为，在骨炭吸附中，元素碳反而发挥了主导作用。进一步以氟甲喹（FLU）和1-苯基哌嗪（PHP）为探针化合物，探索了吸附机理。PHP含有和NOR相似的哌嗪基，而FLU含有和NOR相似的氧代喹啉羧酸。研究发现，PHP探针在骨炭上的吸附小于NOR，更小于FLU，表明NOR分子上的氧代喹啉羧基在吸附中扮演着重要角色。而木炭对大分子NOR的吸附要小于小分子的PHP和FLU，这可能归结为NOR有着更强的空间位阻。动力学实验表明，木炭吸附NOR达到平衡的时间要长于骨炭，也从侧面佐证了这一观点。 |
| 英文摘要: |
| 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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