Preparation Of Activated Carbon Fiber Supported Iron Tetrasulfophthalocyanine Catalyst And Its Catalytic Degradation Performance Of Phenols

The phenols belong to the toxiferous protoplasm contamination of the organic pollutants, which would bring huge damage to the human and the propagation, even cause acute poisoning or endanger our lives. They also have great influences on the procreation system, and it's hard to eliminate or degrade for their persistence in the environment. Thus, the treatment of phenols has been taken seriously by people. The traditional treatment technologies for eliminating phenols include physical-chemistry methods, chemical treatments and biological treatments, especially the advanced oxidation processes (AOPs) of the chemical treatments, which have been applied for the most. Due to the low turnaround speed, inefficiency and tend to be poisoned, etc, the using of the biological treatments have been restricted. Although the physical-chemistry methods could eliminate the phenols effectively, only had the transfer and enrichment of the contaminations happened. And the adsorbents need to be regenerated, which will make the adsorption capacity falling down and introducing the secondary pollution. The recycle of catalyst go against with the traditional homogeneous catalysis of AOPs, so the heterogeneous catalysis of AOPs were adopted.Combining the adsorption method and AOPs together, which take full advantage of the two above and conquer the secondary pollution caused in the regeneration of the supporter.Iron tetrasulfophthalocyanine (FePcS) was selected as catalyst, and activated carbon fiber (ACF) was selected as supporter for its good adsorption and chemical stability. Thereby, a new effective catalytic oxidation system, which was consisted by the activated carbon fiber supported iron tetrasulfophthalocyanine catalyst (ACF-FePcS) and the environmental friendly hydrogen peroxide had been adopted. The catalytic degradation performances and the influences of this system had been investigated. Finally, the oxidation performance of other phenols catalized by ACF-FePcS had been discussed. The details of our research are as follows.1. FePcS was prepared by Phthalic anhydride-Urea method in solid phase and was characterized by UV-vis and FMS. Acid treated ACF (ACF-T) was modified by ethylenediamine to get the ACF-E, which was characterized by ATR-FTIR. After that, the ACF-FePcS was prepared by supporting the FePcS onto the ACF-E. UV-vis DR and XPS were applied to characterize ACF-FePcS. The content of FePcS in ACF-FePcS was measured by atomic absorption spectrometer. The content of FePcS in ACF-FePcS was 6.19×10^-6mol/g, and the relative content was 0.55%.2. The result of UV-vis DR showed that the FePcS was supported on the ACF-E by chemical bond. The XPS revealed that an amido bond was formed between ethylenediamine and ACF-T, and FePcS was suppoted on ACF-E by sulfonamide bond. The XPS result also showed that FePcS could maintain its conjugation ring structure after being supported on the ACF.3. The concentration's variation of 4-NP was detected by UPLC, which inferred that the ACF-FePcS/H₂O₂ could remove the 4-NP effectively and owned a well in situ regeneration ability. FePcS was prone to degrade itself and lost the active coordination center for the formation of dimmer, thus there was no catalytic activity on the degradation of 4-NP. In a word, not only had the catalytic activity of FePcS in the aqueous solution been improved, but also had the catalytic stability been enhanced.4. The results of the influence factors indicated that the ACF-FePcS/H₂O₂ system could remove the 4-NP efficiently over a wide range of pH and temperature. The adding of anionic surfactant would block the absorption of 4-NP onto ACF-FePcS, consequently blocked the catalytic degradation of 4-NP, which showed that the catalytic oxidation performance related to the absorption. The catalytic effect of 4-NP was increased accompany with the concentration increasing of NaCl. The catalytic process was inhibited obviously after adding the hydroxyl radical capture agent-isopropyl, which revealed that this process was according with the hydroxyl radical mechanism.5. The ACF-FePcS had a good effect on the catalytic degradation of 4-NP and 4-PTBP with ACF-FePcS on the existing of H₂O₂, yet no activity on phenol. This result showed that the catalyst had catalytic selective property in some extent, and maybe applied in the treatment of waste water containing phenols with strong pertinency.