Synergetic adsorption and catalytic oxidation performance originating from leafy graphite nanosheet anchored iron(II) phthalocyanine nanorods for efficient organic dye degradation
Synergetic adsorption and catalytic oxidation performance originating from leafy graphite nanosheet anchored iron(II) phthalocyanine nanorods for efficient organic dye degradation
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DOI：
10.1039/c4ra16530f
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发表时间：
2015-03
期刊：
影响因子：
3.9
通讯作者：
Guang'en Yuan;Guoquan Zhang;Yufei Zhou;Fenglin Yang
中科院分区：
文献类型：
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作者：
Guang'en Yuan;Guoquan Zhang;Yufei Zhou;Fenglin Yang
在不使用复杂的共价锚定过程的情况下，容易地合成了叶状石墨纳米片锚定的酞菁铁（II）纳米棒（FePc@LGNS）。FE-SEM、XRD、FTIR和XPS表征证实了LGNS表面FePc的分子构型。FePc@LGNS杂化材料的疏水/亲水区域和大的比表面积不仅提高了FePc@LGNS的吸附能力，而且由于LGNS表面有足够的FePc催化活性位，从而提高了FePc@ LGNS-H2 O2体系的氧化能力。去除CR的最佳条件为初始pH 6.98，50 mM H2 O2和1.0 g L−1 FePc@LGNS hybrid。与经典的芬顿法不同，高价铁（IV）-氧代配合物和羟基自由基是刚果红（CR）氧化降解的主要原因。液相色谱-质谱（LC-MS）分析表明，CR分子的偶氮键和C-C键都有效断裂。提出了FePc@ LGNS-H2 O2体系的氧化机理和CR的降解途径。FePc@ LGNS-H_2 O_2体系可在较宽的pH范围内高效氧化去除柠檬酸类污染物。
Leafy graphite nanosheet anchored iron(II) phthalocyanine nanorods (FePc@LGNS) were facilely synthesized without using a complex covalent anchoring procedure. FE-SEM, XRD, FTIR, and XPS characterizations confirmed the molecular configuration of FePc on the LGNS surface. The interlaced hydrophobic/hydrophilic regions and large specific-surface-area of the FePc@LGNS hybrid not only improved the adsorption capacity, but also promoted the oxidative ability of the FePc@LGNS–H2O2 system due to sufficient FePc catalytic active sites on LGNS surface. The optimal conditions for CR removal were initially pH 6.98, 50 mM H2O2 and 1.0 g L−1 FePc@LGNS hybrid. Different from the classical Fenton process, high-valent iron(IV)–oxo complexes and hydroxyl radicals are responsible for Congo red (CR) oxidative degradation. Liquid chromatography-mass spectrometry (LC-MS) analysis demonstrated the effective cleavage of both azo bonds and C–C bonds of CR molecules. A plausible oxidation mechanism of the FePc@LGNS–H2O2 system and the degradation pathway of CR were proposed. This FePc@LGNS–H2O2 system could be a highly efficient oxidation process for recalcitrant pollutants elimination over a wide pH range.