零价铁掺杂氮化碳吸附水中卡马西平性能研究
Study on the adsorption of carbamazepine by zero valent iron doped carbon nitride in water
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摘要: 针对传统碳材料吸附有机污染物性能不足和固液分离性能较差的缺陷,合成零价铁掺杂氮化碳(Fe@N/C)吸附剂。与氮化碳(N/C)相比,Fe@N/C具有更高的比表面积、孔容和孔径,有利于含N和含O活性位点的暴露以及污染物的吸附。以卡马西平(CBZ)为目标污染物,详细研究了溶液pH、吸附时间和污染物浓度对Fe@N/C吸附效果的影响。结果表明,Fe@N/C能在较宽pH范围内吸附水中CBZ;吸附过程遵循准二级动力学模型和Langmuir等温模型;拟合得到Fe@N/C的最大吸附量为56.88 mg/g;Fe@N/C具有良好的再生利用性能,而且吸附完成后利用磁铁即可快速将吸附剂从水中分离开来;吸附机理研究表明,Fe@N/C主要通过π-π电子供体-受体相互作用和氢键作用吸附去除水中的CBZ。Abstract: Zero valent iron doped carbon nitride (Fe@N/C) was synthesized to address the shortcomings of insufficient adsorption performance and poor solid-liquid separation performance of traditional carbon materials. Compared to carbon nitride (N/C), Fe@N/C had a higher BET surface area, pore volume and pore size, facilitating the exposure of N- and O-contained active sites, as well as the adsorption of pollutants. Carbamazepine (CBZ) was selected as the target pollutant, and the effect of solution pH, adsorption time and pollutant concentration on the adsorption performance of Fe@N/C was studied in detail. The results indicated that CBZ could be adsorbed onto Fe@N/C in a wide pH range. The adsorption process conformed to the pseudo-second order kinetic model and Langmuir isothermal model. The maximum adsorption capacity of Fe@N/C obtained by fitting with Langmuir isothermal model reached to 56.88 mg/g. Fe@N/C exhibited good reusability, and the adsorbent can be quickly separated from water using a magnet after adsorption. The adsorption mechanism indicated that CBZ was adsorbed onto Fe@N/C through π-π electron donor acceptor interactions and hydrogen bonding.
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