期刊
CHEMICAL ENGINEERING JOURNAL
卷 248, 期 -, 页码 128-134出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.03.021
关键词
Herb residue; Biochar; Sulfamethoxazole (SMX); Sorption; Negative charge-assisted H-bond
资金
- Central Public Research Institutes Basic Funds for Research and Development (Agro-Environmental Protection Institute, Ministry of Agriculture) [2014-szjj-lf-09]
- National Natural Science Foundation of China [41203083]
- Tianjin Municipal Science and Technology Commission [13JCZDJC35900]
- Open Research Fund Program of Shandong Provincial Key Laboratory of Eco-Environmental Science for Yellow River Delta (Binzhou University) [2012KFJJ01]
Biochars were produced by pyrolyzing residue of a traditional Chinese medicine, Danshen, at different temperatures (250-.800 degrees C) and used as adsorbents for sulfamethoxazole (SMX). The biochar prepared at 250 degrees C (B250) exhibited 2-7 times higher sorption capacity to SMX than those prepared at higher temperatures. The high sorption capacity of 8250 was mainly accounted by the negative charge-assisted H-bond [(-)CAHB] between SMX and B250 due to its abundant O-containing groups and comparable pK(a) to that of SMX (pK(a,2) =5.7). The thermodynamic analysis suggested that SMX sorption on the biochars was a spontaneous and endothermic process. The higher increase of enthalpy and entropy for low-temperature chars were well correlated with the strong (-)CAHB between SMX and oxyl groups on the chars. This study indicates that (-)CAHB could be more easily formed on low-temperature chars which are rich in oxyl groups, and provides valuable information on design and synthesis of efficient biochars for various environmental applications. (c) 2014 Elsevier B.V. All rights reserved.
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