| 两种生物炭的制备及其对水溶液中四环素去除的影响因素 |
| 摘要点击 2438 全文点击 803 投稿时间：2018-07-10 修订日期：2018-09-03 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 三桠苦药渣 玉米秸秆 生物炭 四环素 水溶液 影响因素 |
| 英文关键词 Chinese medicine residue Evodia lepta corn stalks biochar tetracycline aqueous solution influencing factors |
|
| 中文摘要 |
| 以中药材三桠苦药渣和玉米秸秆为原料，分别在400、600和800℃下热解制备生物炭，并研究其对水溶液中四环素的去除及其影响因素.利用元素分析、傅里叶红外光谱（FT-IR）、比表面积分析（BET）、X射线衍射（XRD）、扫描电子显微镜（SEM）等方法对制备的生物炭进行表征；并探究热解温度、生物炭添加量、初始溶液浓度、吸附时间、溶液pH、离子强度、环境温度等因素对生物炭去除水溶液中四环素的影响；通过吸附动力学和等温吸附平衡探究两种原料制备的生物炭对溶液中四环素的吸附行为.结果表明，生物炭对四环素的吸附性能随制备温度的升高而增加，800℃制备的三桠苦药渣生物炭（EIBC800）具有最佳吸附性能.生物炭添加量、溶液pH、离子强度、吸附时间对800℃制备的三桠苦药渣生物炭（EIBC800）和玉米秸秆生物炭（CSBC800）吸附水溶液中四环素影响较大，吸附时环境温度对吸附的影响大小依赖于抗生素质量浓度.EIBC800和CSBC800对四环素的吸附行为均符合准二级动力学方程（R2分别为0.9540和0.8355），等温吸附符合Freundlich方程（R2分别在0.8991~0.9579和0.9736~0.9946之间），主要吸附过程为化学吸附，且吸附过程均是自发吸热的过程.通过以两种原料所制备的生物炭吸附性能对比，EIBC800吸附抗生素的能力比CSBC800更强，说明中药渣在制备生物炭去除水环境中的抗生素具有较好的应用前景. |
| 英文摘要 |
| In this research, Chinese medicine residue of Evodia lepta and corn stalks were chosen as raw materials to prepare biochar (EIBC and CSBC) at 400, 600, and 800℃, for the removal of tetracycline from solution. The biochar was characterized by elemental analysis, Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The effects of pyrolytic temperature, biochar dosages, initial concentration, adsorption time, solution pH, ionic strength, and ambient temperature on the removal of tetracycline from solutions by biochar were investigated. The adsorption behavior of tetracycline by biochar was investigated using adsorption kinetics and adsorption isotherms. The results showed that the adsorption capacity of biochar for tetracycline was elevated with increase in the pyrolysis temperature. The biochar prepared from Chinese medicine residue Evodia lepta at under 800℃ (EIBC800) had the best adsorption properties. Biochar dosages, solution pH, ionic strength, and adsorption time had significant effects on the adsorption of tetracycline by EIBC800 and CSBC800. In contrast, the effect of ambient temperature on tetracycline adsorption was a concentration-dependent process. The adsorption kinetics and isotherms of tetracycline onto EIBC800 and CSBC800 were all fitted to pseudo-second order models (R2 0.9540 and 0.8355) and to a Freundlich equation (R2 between 0.8991-0.9579 and 0.9736-0.9946), respectively. The adsorption process was mainly controlled by chemical reaction, and the tetracycline adsorption process was spontaneous and endothermic. Compared with the corn-stalk derived biochar, EIBC800 had better adsorption capacity for antibiotics than CSBC800 did, which indicated that Chinese medicine residue derived biochar had wider prospects for application in the treatment of wastewater containing antibiotic residues. |
|
|
|
