Modified titanium dioxide was prepared using titanium dioxide as raw material,and then used as additive to prepare polypropylene/m@titanium dioxide nanocomposite fiber membrane through melt-blown nonwoven technology.Through orthogonal experiment,the optimal preparation process conditions were determined as follows:the hot air temperature is 295 ℃,the hot air pressure is 400 kPa,and the barrel pressure is 400 kPa.The structure and thermal properties of the polypropylene/m@titanium dioxide nanocomposite fiber membrane were characterized,and its application performance in coal chemical wastewater was studied.The results show that the crystallinity of the PP5 nanocomposite fiber membrane is 37.6％,the porosity is 96.3％,the average fiber diameter is 3.8 μm,and it has high thermal stability.When the pH is 3,the temperature is 45 ℃,and the adsorption time is 50 min,the adsorption treatment of coal chemical wastewater by PP1 and PP5 reduces the chemical oxygen demand(COD)value.The results show that the COD removal rate of PP5 reaches 20.1％,which is much higher than that of PP1(COD removal rate of 11.1％).After the photocatalytic degradation at 25 ℃,the COD removal rate of PP5 reaches 82.5％,indicating that PP5 has excellent photocatalytic degradation of organic matter in coal chemical wastewater and the photodegradation reaction of PP5 on organic matter in coal chemical wastewater complies with the first-level kinetics learning model.Polypropylene/m@titanium dioxide nanocomposite fiber membrane shows good application prospects in reducing COD of coal chemical wastewater.
关键词
聚丙烯/改性二氧化钛/熔喷非织造/纳米复合纤维/煤化工废水
Key words
polypropylene/modified titanium dioxide/melt-blown nonwoven/nanocomposite fiber/coal chemical industry wastewater
维普
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