Enrichment And Degradation Of Chlorphenols Through Colloidosomes Assembled By P25

Titanium dioxide is a substance that has the perfect hydrophilicity and optical properties.The hydrophilicity of the surface is mainly caused by the hydroxyl functional groups,at the same time,the presence of hydroxyl on the titanium dioxide has the ability of modifiability.The chlorophenols are mainly synthetic organic compounds,the number and the location of chlorine will lead to differences in the toxicity of chlorophenols,and with the industrial emission of chlorophenols,gradually the precipitation happened in the environment,and at the same time the pollutant was widespread in water.In this thesis,three kinds of chlorophenols were selected as the simulated pollutants for the experiment in which these chlorophenols with low concentration and widespread in water can be enriched.meanwhile,the titanium dioxide was chosen for a photocatalyst resulting from its optical properties to degrade chlorophenols and the by-product can be further applied.In the paper,through the calculation of the hydrophilic-lipophilic balance value,titanium dioxide was used as the substrate and the two different silanols as a modifier to form a stable colloidosome with oil filled in the interface of water/oil while using the clloidosome to enrich the three kinds of chlorophenols.Some factors influenced the enrichment of three chlorophenols during the formation of colloidosmes including enrichment phase,pH,humic acid,ions of natural water.the kinetics and thermodynamics of the reaction were also explored.It was found that the synthesized colloidosomeswith n-hexanol filled were able to enrich the pollutants quickly and efficiently,and the concentration of 3-chlorophenol and4-chlorophenol with a concentration of 20 mg / L respectively had a enricehment ratio of 98%at 2 min both.And the enrichment rate of 2-chlorophenol reached 85%.At the same time,the entire enrichment process was found to be completely spontaneous reaction(the enthalpy and entropy changes were less than zero during the reaction).However,Simulating the impact of natural water on the colloidosomes enrichment found that the presence of natural humic acid inhibits the enrichment efficiency.At the same time,aiming at improving the properties of materials,the content of the experiment is same to the experiment described in the second chapter,using the same hydrothermal method to modify the titanium dioxide but changing the type of silane added to form a materials with opposite charge to form a oil-in-water colloidosomes with oppositecharge contrary to the materials used in second chapter to explore the effect of the surface charge on the enrichement of the three kinds of chlorophenols.Experiments show that when n-hexanol is also selected as the best enrichment phase,the enrichment efficiency of three chlorophenols reaches 98% within 2min,and the enrichment ratio of 2-chlorophenol is improved obviously.Effect the presence of humic acid did not effect the enrichment,and all tthe ratios of the three chlorophenols will remain at 95% or more which indictated that the charge will effect the enrichement.the colloidosmes formed in this experiment using the n-hexanol as a phase to enrich the pollutants,but the pollutants were also exsited in the oil,so the experiment in the chapter,using the reduction of n-hexanol,optical properties of titanium dioxide,the ability of hydrogen absorption and electron transfer for Pd to degrade the pollutants selected.So the colloidosome with Pd loaded inside were prepared to for experiment to degrade4-chlorophenol and the effects of different Pd loading ratios on degradation were analyzed,and the intermediate products were also analyzed.The result showed that the Pd-loaded colloidosomes prepared with Pd-loaded amphipathic materials only produced phenols in the middle of degradation of 4-chlorophenol,and 80% of them could be degraded within 135 min.Decomposition of chlorophenols with such colloidosomes has the advantage of converting chlorophenols to phenols,which in turn allows the further use of phenol rather than the waste of resources resulting from conversion to carbon dioxide and water.