We report a novel cobalt tetraaminophthalocyanine (CoPc) functionalized nanomaterial by spacer-arm immobilization of CoPc onto cellulose nanofiber mats. The spacer-arm was attached through the reaction of tetraethylenepentamine with oxidized cellulose nanofiber mats. CoPc was then covalently immobilized onto the spacer-arm using glutaraldehyde. The functionalization processes on the nanofiber mats were monitored by attenuated total reflection Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. This CoPc functionalized nanomaterial (CoPc-spacer-NM) was used for decoloration of reactive dye wastewater. Incorporation of the spacer-arm resulted in enhanced decoloration with respect to directly immobilized CoPc onto the cellulose nanofiber mats (CoPc-NM). Compared with CoPc-NM, CoPc-spacer-NM shows much higher adsorption capacity when conducted under acidic conditions, which enhances the catalytic oxidation rate of reactive dye when H2O2 was used as an oxidant. Reactive dye wastewater can also be efficiently decolorized by the CoPc-spacer-NM/H2O2 system under basic conditions, despite a relatively weak adsorption capacity. Electron paramagnetic resonance results suggested that the catalytic oxidation process involves the formation and reaction of hydroxyl radicals. Gas chromatography–mass spectrometry showed the main products of the catalytic oxidation of reactive red X-3B were biodegradable aliphatic acids, such as oxalic acid, malonic acid and maleic acid.
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机译:我们报告了新型钴四氨基酞菁(CoPc)功能化的纳米材料通过间隔臂将CoPc固定到纤维素纳米纤维垫上。间隔臂通过四亚乙基五胺与氧化纤维素纳米纤维垫的反应而连接。然后使用戊二醛将CoPc共价固定在间隔臂上。通过衰减全反射傅里叶变换红外光谱和X射线光电子能谱监测纳米纤维垫上的功能化过程。该CoPc功能化的纳米材料(CoPc-spacer-NM)用于活性染料废水的脱色。相对于直接将CoPc固定在纤维素纳米纤维垫(CoPc-NM)上,间隔臂的结合导致了增强的脱色。与CoPc-NM相比,CoPc-spacer-NM在酸性条件下具有更高的吸附能力,从而在H 2 sub> O 2 sub>时提高了活性染料的催化氧化速率。用作氧化剂。尽管吸附能力相对较弱,但在碱性条件下,活性染料废水也可以通过CoPc-spacer-NM / H 2 sub> O 2 sub>系统有效地脱色。电子顺磁共振结果表明,催化氧化过程涉及羟基自由基的形成和反应。气相色谱-质谱分析表明,活性红X-3B催化氧化的主要产物是可生物降解的脂肪酸,例如草酸,丙二酸和马来酸。
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