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水中溶解性有机物(DOM)对全球污染物迁移和水处理工艺效能具有重要影响。采用3种典型碳材料,包括碳纳米管(CNTs)、颗粒活性炭(GAC)、粉末活性炭(PAC)分别吸附微污染源水中的DOM。基于荧光发射-激发光谱(EEMs)和平行因子(PARAFAC)分析,解析DOM中的有效荧光组分,评估3种材料对不同组分吸附去除的效果和吸附特征。研究表明:PARAFAC分析方法提取4种荧光组分C1和C2(腐殖酸类)、C3和C4(类蛋白类)。以TOC为基础的吸附等温线模型表明,PAC的KF值大于GAC和CNTs,PAC有丰富的中孔和较大的比表面积,吸附容量比GAC和CNTs更大。C3和C4 2个荧光组分在吸附过程中更容易被吸附,PAC对两者吸附容量最大。研究结果揭示了不同碳吸附材料对水中不同类型有机物的吸附特征,可为吸附工艺应用提供技术参考。
Dissolved organic matter (DOM) in water has a significant impact on global pollutant transport and water treatment process performance. Three kinds of typical carbon materials, including carbon nanotubes (CNTs), granular activated carbon (GAC) and powdered activated carbon (PAC), were used to adsorb DOM in slightly polluted water. Based on the fluorescence emission-excitation spectra (EEMs) and the parallel factor (PARAFAC) analysis, the effective fluorescence components in DOM were analyzed to evaluate the adsorption and desorption characteristics of the three materials on different components. Studies have shown that: PARAFAC analysis of four fluorescent components extracted from C1 and C2 (humic acids), C3 and C4 (like proteins). The TOC-based adsorption isotherm model shows that KF value of PAC is greater than that of GAC and CNTs. PAC has abundant mesopores and large specific surface area, and adsorption capacity is larger than that of GAC and CNTs. C3 and C4 two fluorescent components adsorbed more easily in the adsorption process, PAC adsorption capacity of both the largest. The results revealed that different carbon adsorbents adsorbed different types of organic compounds in water, which could provide technical reference for the application of adsorption technology.