| The definition of super hydrophobic material is that the contact angles of a water droplet exceeds 150° and the roll-off angle hysteresis is less than 10°,it can be classified into natural super-hydrophobic material and synthetic super-hydrophobic material. This new type of special material application is very extensive. Due to the effect of its block water, It can be applied to the places they need, such as automotive paint and super-hydrophobic layer of shoes; As another example, it can be coated on the metal surface in order to prevent the metal surface corrosion by water; Or used for pipeline transportation to reduce drag, at last, it also can be used for the water pollutant adsorption.In this paper, the natural cotton fibers were used as substrate materials, Two steps would be implemented, firstly, we use sol-gel method of TEOS eutectic system to modify the substrate, and then treat it with OTS in order to react with the hydroxy groups. In order to remove the impurities and wetting sufficient, the cotton fibers should be pretreatment. The experiments use single factor method to analyze the effect of the reagent dosage, reaction time and reaction temperature, respectively. Structure of super-hydrophobic material was characterized by SEM,TQ CA, FT-IR, XRD, XPS and DSCto get the optimal conditions of super-hydrophobic cotton fibers. And when the dose of OTS is 1 mL, reaction time is 3 h, reaction temperature is 60 ℃, the dose of distilled water is 0.3 mL, the contact angle will be up to 159.1°, and it has a great property of super-hydrophobic effect.Owning to its magical properties, hydrophobic materials have attracted much attention. In this paper, the experiments were carried out and the results were analyzed and demonstrated for testing its adsorption performance.In this part of experiment, nitrobenzene and phenol was adsorbed by self-made super-hydrophobic cotton fibers, the different removal rate curves can be achieved in different dosage of adsorbent, different initial concentration and different pH values, respectively. Adsorption equilibrium curve would be drawn in different temperature, based on the data of experiment and Langmuir adsorption model, Freundlich adsorption model and Redlich-Peterson adsorption model, choose which is the most suitable model. In the end, thermodynamics and dynamics of two adsorbates would be analyzed and validated in order to obtain the most appropriate results. The experiment results show that the Freundlich adsorption model and pseudo-second-order kinetic model is more suitable for describing the adsorption process of nitrobenzene by super-hydrophobic cotton fiber. When the initial concentration of nitrobenzene is 1.0 mg/L, the reaction temperature is 30 ℃, pH=7, the maximum adsorption is up to 0.77 mg/g at equilibrium, and after 15 minutes the adsorption will be balance.For phenol, Redlich-Peterson adsorption model and pseudo-second-order kinetic model is more suitable here, like nitrobenzene, raise the temperature and increase the dose of adsorbent is favorable for the removal rate of phenol. When the initial concentration of phenol is 1.0 mg/L, the reaction temperature is 30 ℃, pH=7, the maximum adsorption is up to 0.66 mg/g at equilibrium, and after 20 minutes the adsorption will be balance.The experiments also use single factor method to analyze the effect of the reagent dosage, reaction time and reaction temperature, respectively. When the dosage of OTS was 0.5mL, reaction time was 3h, reaction temperature was 45 ℃, dosage of H2O was 0.3mL, the property of obtained super-hydrophobic MCC was best, and the contact angle up to 156.6°。In the end, according to a certain ratio between super-hydrophobic MCC and polylactic acid, when a mixing weight ratio of 15%, the highest contact angle is up to 90°。... |
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