Effect of a spacer on phthalocyanine functionalized cellulose nanofiber mats for decolorizing reactive dye wastewater
Effect of a spacer on phthalocyanine functionalized cellulose nanofiber mats for decolorizing reactive dye wastewater
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DOI：
10.1007/s10570-012-9701-9
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发表时间：
2012-04
期刊：
影响因子：
5.7
通讯作者：
Shiliang Chen;Xiaojun Huang;Zhi‐Kang Xu
中科院分区：
文献类型：
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作者：
Shiliang Chen;Xiaojun Huang;Zhi‐Kang Xu
我们报告了一种新型四氨基酞菁钴 (CoPc) 功能化纳米材料，通过将 CoPc 间隔臂固定到纤维素纳米纤维垫上。通过四乙烯五胺与氧化纤维素纳米纤维垫的反应来连接间隔臂。然后使用戊二醛将 CoPc 共价固定到间隔臂上。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。这种CoPc功能化纳米材料（CoPc-spacer-NM）用于活性染料废水的脱色。相对于直接固定到纤维素纳米纤维垫 (CoPc-NM) 上的 CoPc，间隔臂的加入增强了脱色效果。与CoPc-NM相比，CoPc-spacer-NM在酸性条件下表现出更高的吸附能力，当H2O2作为氧化剂时，提高了活性染料的催化氧化速率。尽管吸附能力相对较弱，但 CoPc-spacer-NM/H2O2 系统在碱性条件下也可以有效脱色活性染料废水。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，如草酸、丙二酸和马来酸。
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 H2O2was used as an oxidant. Reactive dye wastewater can also be efficiently decolorized by the CoPc-spacer-NM/H2O2system 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.