| Environmental problems during production and in life are always important issues for us to concern. Thiol and formaldehyde are two kinds of organic pollutants commonly existing in our production and living environment and thus their treatment correlated the improving of our life quality tightly. Metallophthalocyanine is a dominating kind of catalyst for the oxidation of thiol, and also can catalyze the oxidation of formaldehyde. Activated carbon fibers(ACF) is a kind of adsorbent with high special surface area and thus outstanding adsorption performance, widely applied to adsorb organic pollutants involving thiol and formaldehyde. In this paper, with both the catalytic performace of Metallophthalocyanine and the adsorptive performance of ACF in mind, reactive cobalt phthalocyanine(m-CoPc) was synthesized and then covalently anchored to ACF to obtain ACF supported CoPc(ACF-CoPc). The catalytic performance of ACF-CoPc on the oxidation of thiol and formaldehyde was investigated. The high adsorptive abilty of ACF can enrich target pollutant to the neighborhood of CoPc, which helped to raise the speed of the catalytic oxidation. CoPc was expected to catalyze the oxidation of pollutants adsorbed on ACF to regenerate it incessantly. The work contents of this paper and conclusions are listed as follows:Cobalt tetra(2,4-bichloro-1,3,5-triazine) aminophthalocyanines were synthesized and covalently anchored to nitric acid-treated ACF(o-ACF) to obtain ACF-CoPc. By atomic absorption spectrometer analysis, the loading of CoPc on ACF-CoPc is estimated to be 5.26μmol/g. The Specific Surface Areas and Pore Size Distribution of ACF and ACF-CoPc were measured using Nitrogen Adsorption method. The result was that after nitric acid treatment, the Specific Surface Area of ACF became a little larger, while the loading of CoPc caused a slight decrease of the Specific Surface Area. The Pore Size Distributions implied that nitric acid treatment brought on more micropores and mesopores, while the CoPc loaded may shield or block the micropores and mesopores on the surface of ACF.The catalytic performance of ACF-CoPc on the oxidation of 2-Mercaptoethanol(2-ME) in aqueous solution in the absent of base was investigated by employing Ultra Performance Liquild Chromatography(UPLC) to determine the concentrations of 2-ME and its oxidation product in different reaction time. In oxygen atmosphere, the removal rate of 2-ME by ACF-CoPc reached 100% and the concentration of oxidation product 2,2'-Dithiodiethanol(DTDE) in the solution was 4.05×10-3mol/L after reaction for 4h, while for the same reaction time, the removal rate of 2-ME by o-ACF was only 52.7% and the concentration of DTDE was 2.00×10-3mol/L. This indicates that the CoPc anchored on ACF is capable of catalyzing oxygen to oxidize 2-ME in the absent of base. The increase of pH, temperature or shaking speed can improve the removal of 2-ME,whereas the increase of initial concentration or adsorption of DTDE resulted in decrease of removal rate of 2-ME. In addition, the catalytic performance of ACF-CoPc on the removal of 2-ME did not decrease obviously after six run cycles, implying that its performance for recycle is fine.The catalytic performance of ACF-CoPc on the oxidation of n-Propylmercapatan(n-PM) in n-hexane was investigated by employing UPLC to determine the concentrations of n-PM and its oxidation product in different reaction time. After reaction for 4h, the removal rate of n-PM by o-ACF was 23.9% and the concentration of oxidation product Dipropyl disulfide(DPDS) was 3.50×10-4mol/L, while after the same time, the removal rate of n-PM by ACF-CoPc was 38.9% and the concentration of DPDS was 5.19×10-4mol/L. This indicates that the CoPc anchored on ACF can catalyze the oxidation of n-PM in n-hexane. The removal rate of n-PM decreased when initial n-PM concentration increased. When the loading of CoPc on ACF-CoPc increased, the removal result of n-PM by ACF-CoPc was much better. This further demonstrates that CoPc has catalytic activity for the oxidation of n-PM.The catalytic performance on the oxidation of formaldehyde in air was also investigated at room temperature by acetylacetone spectrophotometric analysis to determine the concentration of formaldehyde at different reaction time. The removal rate of formaldehyde by ACF-CoPc in air was much higher than that in nitrogen, which indicates ACF-CoPc is capable of catalyzing the oxidation of formaldehyde by oxygen in air at room temperature. When the temperature was increased, the removal rate of formaldehyde by ACF-CoPc increased first followed by a slight decline. Increasing the amount of ACF-CoPc within a certain range improved the removal of formaldehyde. However, the removal rate of formaldehyde declined when initial concentration of formaldehyde increased. |
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