富Ca/Fe抗生素菌渣生物炭的制备及其对磷酸盐的吸附
Fabrication of biochars derived from Ca/Fe-rich antibiotic fermentation residue and their adsorptive performances for phosphate
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摘要: 富Ca/Fe抗生素菌渣既是国家规定的危险废物,又具有显著的生物质和金属资源属性,但现有处理技术鲜有关注这二者的协同回收利用;同时,现有研究对菌渣生物炭的应用探索较少。针对于此,该研究以富Ca/Fe妥布霉素菌渣为原料,用水热法和热解法分别制备了水热炭和热解炭,并探索其在吸附除磷方面的应用。结果表明,水热炭和热解炭均具有较高Ca和Fe含量;但热解炭无需改性便具有较强吸附磷能力和磁性,其中600 ℃制备的热解炭(PC-600)最适合用于吸附水中磷酸盐。PC-600适用于碱性环境,受Cl-、NO3-影响较小,而HCO3-促进吸附过程;PC-600吸附速度较快,平衡时间仅为420 min;吸附过程符合Langmuir模型,最大吸附容量达108 mg/g(35 ℃);吸附机理主要为化学沉淀和配体交换。该研究可实现富Ca/Fe菌渣中生物质和金属资源协同回收利用,为菌渣生物炭的应用提供参考,同时为水体磷污染治理提供高效吸附材料。Abstract: The Ca/Fe-rich antibiotic fermentation residue (AFR) is a hazardous waste in China, which can also be regarded as both biomass and metal resources. However, the existing treatment technology rarely pays attention to the concurrent recycle of the two resources. Meanwhile, information about the application of AFR-derived biochar is still limited. Therefore, in this study, the Ca/Fe-rich tobramycin fermentation residue was used for the fabrication of hydrochars and pyrochars using hydrothermal carbonation and pyrolysis, respectively, followed by the investigation of the phosphate adsorption performance of the hydrochars and pyrochars. The results show that both hydrochars and pyrochars contained high Ca and Fe contents; whereas, the pyrochars exhibited high affinity for phosphate and strong magnetism without further modification. Among pyrochars, the one prepared at 600 °C (PC-600) was most suitable for phosphate adsorption from aqueous solution. Alkaline environment was favorable for phosphate adsorption by PC-600. The adsorption process was almost not affected by Cl- and NO3-, but was promoted by HCO3-. PC-600 exhibited rapid kinetics with an equilibrium time of 420 min. The adsorption process could be fitted well by the Langmuir model, and the maximum adsorption capacity (qm) reached 108 mg/g at 35 °C. The main adsorption mechanism included precipitation and ligand exchange. This study can realize the concurrent recovery and utilization of biomass and metal resources from the Ca/Fe-rich AFR, provide reference for the application of AFR-derived biochar, and provide efficient materials for the treatment of phosphorus polluted water.
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Key words:
- antibiotic fermentation residue /
- biochar /
- pyrolysis /
- adsorption /
- phosphate
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