期刊
JOURNAL OF SOILS AND SEDIMENTS
卷 16, 期 3, 页码 889-895出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11368-015-1325-x
关键词
Antibiotics; Charcoal; Designer biochar; Engineered biochar; Sorption kinetics
资金
- National Research Foundation of Korea [NRF-2015R1A2A2A11001432]
- National Research Foundation of Korea [2015R1A2A2A11001432] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Sulfamethazine (SMT) is increasingly detected in environmental matrices due to its versatile use as antibiotics. We aimed to investigate the benefits and roles of steam activation of biochars with respect to SMT sorption kinetics and equilibrium sorption. Biochars were produced from burcucumber plant and tea waste using a pyrolyzer at a temperature of 700 A degrees C for 2 h. The biochar samples were treated with 5 mL min(-1) of steam for an additional 45 min for post-synthesis steam activation. The SMT sorption on the unmodified and steam activated biochars were compared. The time taken to reach equilibrium was significantly less for steam activated biochars (similar to 4 h) than non-activated biochars (> 24 h). Up to 98 % of SMT could be removed from aqueous solutions by steam activated biochars. The sorption kinetic behaviors were well described by the pseudo-second model and SMT sorption rates of steam activated biochars (k (2) similar to aEuro parts per thousand 1.11-1.57 mg g(-1) min(-1)) were significantly higher than that of the unmodified biochars (k (2) similar to aEuro parts per thousand 0.04-0.11 mg g(-1) min(-1)) because of increased availability of accessible porous structure with averagely larger pore diameters. Moreover, the equilibrium sorption on the unmodified biochars was significantly influenced by increasing solution pH (similar to 30-50 % reduction) because of speciation change of SMT, whereas steam activated biochars manifested much stronger sorption resilience against pH variation (similar to 2-4 % reduction only) because the enhanced porosity offset the effect of unfavorable electrostatic repulsion. The observed features of steam activated biochars would render their applications more versatile and reliable in field throughout changeable environmental conditions.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据