2021年6月5日 · The stability of the 50 % EG-BiOF during the photocatalytic degradation of PFOA was investigated. Fig. S7a shows the degradation efficiency of PFOA during the second and third cycles was still close to 100 %. After the recycle experiments, the 50 % EG-BiOF was recovered and subjected to XRD analysis (Fig. S7b).

本研究采用无溶剂一锅法设计、制备了一种含氟富氮多孔有机聚合物 (POP-3F),通过引入氟原子增加了材料的疏水性,增加了主客体分子间的疏水作用、氟-氟相互作用,提升了材料对PFOA的吸附效果。 使用扫描电子显微镜 (SEM)、傅里叶变换红外光谱 (FT-IR)、X-射线衍射仪 (XRD)、固体核磁 (ssNMR)、X射线光电子能谱仪 (XPS)、热分析系统 (TGA)等对POP-3F进行了表征。 结合液相色谱-串联质谱法 (LC-MS/MS),研究了POP-3F在不同pH、盐浓度和腐植酸条件下对PFOA的吸附性 …

2024年12月1日 · Here, we developed a rapid PFOA detection mode to detect approximate concentrations of PFOA (ranging from 10 −15 to 10 −3 mol/L) in deionized water, and detecting one sample takes only 20 min. The detection mode was achieved using a deep learning model trained by a large surface enhanced Raman spectra dataset, based on the agglomeration of ...

X-ray diffraction (XRD) analyses were performed to evaluate the zeolites’ crystallographic structure after the ion-exchange process (Figure 1c). The two major diffraction peaks around 2θ = 7.5° and 2θ = 22.6° are assigned to the faulted structure due to the coexistence of two polymorphs in BEA-type zeolites and the expansion/contraction ...

全氟辛酸(perfluorooctanoic acid, PFOA)是全氟 化合物(perfluorinated compounds, PFCs)的一种, 是一 种人工合成的有机物, 其分子式为CF 3(CF 2) 6COOH. 碳氟键是一种键能极强的化学键(485 kJ mol 1), PFOA中含有1个非极性的氟碳脂肪链, 因此增加了 这种化合物的稳定性.

2020年8月18日 · Pentadecafluorooctanoic acid (C 7 F 15 COOH, PFOA), its salts, and PFOA-related compounds have excellent surfactant properties and are used to give textiles water...

2023年12月15日 · The XRD spectrum of GO displayed a highly intense sharp peak at 2θ of 11.6°, which corresponded to the (0 0 2) plane (Fig. 2 a). In contrast, the (0 0 2) peak in the spectrum of rGA was weak, broad, and near 26.0°. The different XRD patterns between GO and rGA might be due to their differences in layer spacing and structure integrity.

2024年5月27日 · 通过研究吸附动力学和等温线确定所需的平衡时间和最大吸附容量，评价pH和共存阴离子对吸附性能的影响，通过密度泛函理论（DFT）计算揭示了PFOS/PFOA与nZVI在界面吸附过程中的结合机制。 图1显示了使用nZVI去除不同初始浓度的PFOA（0.2、1、4和8 mg/L）和全氟辛烷磺酸（5、 10、30和60 mg/L）的情况。 随着初始浓度的增加，PFOA和PFOS的去除率呈下降趋势。 值得注意的是，在5 mg/L的初始浓度下，PFOS的去除率可达到100%。 …

采用化学共沉淀法成功制备了一种新型掺钐铁氧体复合材料，用于全氟辛酸（pfoa）的光催化降解。通过xrd、ft-ir、sem、xps、uv-vis和vsm对掺钐铁氧体进行了表征。

X射线衍射（XRD）和TEM表征表明，TiO 2 与BiOX沿 [110]晶面结合，促进了 [001]方向的光致电子转移，从而有利于PFOA的分解。 BiOX (X = Cl, Br and I) and BiOX/TiO photocatalysts were prepared by a facile hydrothermal approach. The BiOX/TiO heterojunctions demonstrated significantly enhanced efficiency for photocatalytic decomposition of perfluorooctanoic acid (PFOA) compared with sole BiOX or TiO.