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Sorption of sulfamethoxazole on biochars of varying mineral content.
Environmental Science: Processes & Impacts ( IF 5.5 ) Pub Date : 2020-04-14 , DOI: 10.1039/d0em00102c
Jing Li 1 , Yihui Chen 2 , Liping He 2 , Ni Liang 1 , Lin Wang 1 , Jing Zhao 1 , Bo Pan 1
Affiliation  

The sorption characteristics of ionizable organic contaminants on biochars are currently unclear, largely because of the different mineral content and pH of the investigated biochars. This study examines the sorption of sulfamethoxazole (SMX) on a number of biochars with different ash contents (KCl and Ca-containing minerals), surface areas (SAs), and acid-basic properties. SMX sorption on biochars produced at 200 °C showed higher sorption compared to sorption on biochars produced above 300 °C due to the hydrophobic effect, hydrogen bonds, and π-π electron donor-acceptor interactions (π-π EDA interactions) resulting from a larger fraction of neutral SMX present in the sorption system. Under alkaline conditions, less sorption nonlinearity was observed, probably resulting from the limited contact between the dissociated SMX- and the negatively charged surface of biochars. Significant sorption observed at alkaline pH was attributed to the negative charge assisted hydrogen-bond (-(CAHB)). When the pyrolysis temperature increased above 400 °C, the increase in the SA of the biochars facilitated apparent sorption. Ca-containing minerals in biochars may provide additional sorption sites for SMX- through electrostatic interactions. This study indicates that the overall sorption of SMX was governed by a combination of factors such as the surface charge, functional groups, SA, and mineral composition of biochars.

中文翻译:

在不同矿物质含量的生物炭上吸附磺胺甲恶唑。

目前尚不清楚可电离的有机污染物在生物炭上的吸附特性,这主要是由于所研究的生物炭的矿物质含量和pH不同。这项研究检查了磺胺甲恶唑(SMX)在许多具有不同灰分含量(KCl和含Ca的矿物),表面积(SAs)和酸碱性质的生物炭上的吸附。与在300°C以上产生的生物炭相比,在200°C产生的生物炭上的SMX吸附显示出更高的吸收,这是由于疏水作用,氢键和由a吸附系统中存在较大比例的中性SMX。在碱性条件下,观察到较少的吸附非线性,可能是由于解离的SMX-和生物炭带负电的表面之间的接触有限。在碱性pH下观察到的显着吸附归因于负电荷辅助的氢键(-(CAHB))。当热解温度增加到400°C以上时,生物炭SA的增加会促进表观吸附。生物炭中的含钙矿物质可能通过静电相互作用为SMX-提供额外的吸附位点。这项研究表明,SMX的总体吸附受多种因素控制,例如表面电荷,官能团,SA和生物炭的矿物质组成。生物炭SA的增加促进了表观吸附。生物炭中的含钙矿物质可能通过静电相互作用为SMX-提供额外的吸附位点。这项研究表明,SMX的整体吸附受多种因素控制,例如表面电荷,官能团,SA和生物炭的矿物质组成。生物炭SA的增加促进了表观吸附。生物炭中的含钙矿物质可能通过静电相互作用为SMX-提供额外的吸附位点。这项研究表明,SMX的整体吸附受多种因素控制,例如表面电荷,官能团,SA和生物炭的矿物质组成。
更新日期:2020-04-14
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