Ionic Liquid-assisted Removal P-chlorophenol From Aqueous Solutions

With the development of chemical industry, more and morechlorinated aromatic compounds were used, which are hard to degrade. One of thesecompounds is halophenols, of whichthe most commonly used is chlorophenol. But thechlorophenol could cause the environmental pollution, particularly the water pollution. Theemerging paper and textile industry increases the chance for chlorophenol to enter the water.Chlorophenol is one of the phenolic compounds, which have carcinogenic, teratogenic andmutagenic and genetic toxicity. Scientists from all over the world have done many researchfor chlorophenol, but only a few on the solution with low concentration. It is imminent todevelop a new efficient and low cost method to remove them. This paper found a new way tocombine the advantages of both ionic liquid and active carbon, using the advantage of theboth to remove chlorophenol. The toxic compounds could also be degraded electronicallywith the assistance of ILs.The new absorbent was produced by combining the absorptive function of active carbonwith the extraction capability of ionic liquid to remove4-CP. This new kind of absorbent hadmuch higher removal efficiency than active carbon and ionic liquid alone. The removalefficiency of different new absorbents with different ionic liquid were studied. The absorbentwith1-vinyl-3-butylimidazolium hexafluoroborate(VBIMPF6) was used to remove4-CP andthe removal efficiency was up to nearly100%after copolymerizing. The copolymerizationexperiment of VBIMPF6on the surface of active carbon reduces the solubility of ionic liquidin water.Recycled and reused the new absorbent by using organic solvent.Through the research ofoptimize conditions, n-hexane was selected as the eluent to recycle the new absorbents. Andthe best efficiency of renewable was up to93%, it would be73%after recycling6times.Comparing with the traditional exaction and absorption, the new absorbents are moreefficiency and environmental friendly, and have a low cost.Used ionic liquid assist the electronic reaction to degrade the4-CP in the water, and theactive carbon fiber and graphite were used as electrode. Study on the optimize degradationconditions, and the affecting factors of degradation rate including the electrolysis time, electrolysis voltage, the initial concentration of4-chlorophenol. When the initialconcentration of4-chlorophenol was100mg/L, the electrolysis voltage was8V, and reacted90min, the degradation rate was57.6%for the electrode without ionic liquid, and40.2%forthe electrode with ionic liquid assisted. Under the assist of ionic liquid, there was not a largechange of the degradation efficiency, but the adsorption efficiency was completely different.