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Preparation of Activated Carbon Fiber Supported Iron Tetrasulfophthalocyanine Catalyst and Its Catalytic Degradation Performance of Phenols

Author: GuoQiaoSheng
Tutor: ChenWenXing
School: Zhejiang University of Technology
Course: Materials Science
Keywords: Activated carbon fiber The iron Tetrasulphonated phthalocyanine 4 - nitrophenol Catalytic degradation
CLC: X703.1
Type: Master's thesis
Year: 2010
Downloads: 176
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Abstract

Organic pollutants phenols are the protoplasm highly toxic pollutants, long-term exposure will give and bring great harm to animals and plants, and even can lead to acute poisoning and life-threatening impact on the reproductive system, and the environment lasting retention, it is difficult to eliminate and degradation, thus containing phenolic wastewater governance has aroused extensive attention. Containing phenolic wastewater treatment technologies typically include physical and chemical methods, chemical treatment and biological treatment, especially in the chemical treatment of advanced oxidation technology research applications for most. Biological treatment due to its inherent processing cycle is long, the treatment efficiency is low microbial inactivation defects easy poisoning restricted; Acta Chim method faster processing containing phenolic wastewater contaminants, but just transfer and enrichment can not be degraded removed, but will also take on the adsorbent regeneration, will not only result in a decline in the ability of the adsorbent, but also may introduce secondary pollution; the Advanced Oxidation well degradation of wastewater treatment, especially catalytic oxidation , but the traditional homogeneous catalytic system is not conducive to recycling and reuse of the catalyst, and thus we use a non-homogeneous catalytic reaction system in order to achieve a catalyst reuse. This article adsorption and advanced oxidation technology combine, not only can make full use of the advantages of both, and the preparation of the catalyst can be reused, effectively preventing the secondary carrier regeneration and small molecule phthalocyanine bring in the treatment of organic pollutants pollution. We chose the a high activity Tetrasulphonated iron phthalocyanine (FePcS) as the catalyst, good adsorption properties and high chemical stability of the activated carbon fiber (ACF) as a catalyst carrier, a phthalocyanine catalyst prepared iron load of the activated carbon fiber (ACF-FePcS ) together with environmentally friendly hydrogen peroxide constitutes a new and efficient catalytic oxidation system, the degradation of the performance of the catalytic system for the 4 - nitrophenol (4-NP), and the effects of the various factors affecting the catalytic performance, the last of the performance of the catalytic oxidation of phenolic compounds were discussed, specific contents and conclusions are as follows: 1. synthesized by the solid phase phthalic anhydride - Urea the Tetrasulphonated iron the phthalocyanine (FePcS), and UV-vis and FMS characterization; modified with ethylenediaminetetraacetic acid treated ACF (ACF-T), the system had ACF-E, and were characterized by ATR-FTIR, and then load the FePcS to ACF-E, prepared activated carbon fiber supported iron phthalocyanine catalyst (ACF-FePcS), UV-vis DR and XPS to the characterization; measured by atomic absorption spectrometry the ACF-FePcS FePcS with a capacity of 6.19 × 10 ^{-6 mol / g, the relative load of 0.55%. 2. Diffuse UV-vis reflection results show that FePcS by chemical load to the ACF-E; XPS results show that, ethylenediamine load through an amide bond to the ACF-T, FePcS sulfonamide key load to the ACF-E, the FePcS load to the ACF has managed to maintain its conjugate ring structure. 4-NP concentration changes in the catalytic process. UPLC detection, indicating that the ACF-FePcS / H ₂ O ₂ system can effectively remove the 4-NP, and has better in situ regeneration. Easily decomposed in an aqueous solution, FePcS and loss of activity due to the formation of dimers and coordination center, so that the catalytic activity of 4-NP, which can be further illustrated, not only improve the FePcS load to ACF the FePcS in an aqueous solution of catalytic activity, but also improve the catalytic stability. ACF-FePcS / H ₂ O ₂ catalytic removal of 4-NP impact factors of ACF-FePcS in a wide pH range and wide could effectively be removed within a temperature range of 4-NP; the anionic surfactant Add hinder Adsorption of of ACF-FePcS on 4-NP, thereby hindering the process of catalytic degradation, therefore, the of ACF-FePcS on the 4-NP of adsorption The role will affect the catalytic degradation processes carried; the ACF-FePcS 4-NP catalytic efficiency increased with increasing NaCl concentration; Added hydroxyl radical scavengers isopropanol, catalytic degradation processes significantly inhibited the catalytic process is found. hydroxyl free radical mechanism. ACF-FePcS efficiently under catalytic degradation of 4-NP and 4-PTBP H ₂ O ₂, but almost no catalytic activity of phenol, indicating that the catalyst has catalytic selectivity can be targeted for containing phenolic wastewater governance.}

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