聚苯乙烯/Fe3O4悬浮填料的制备及类芬顿处理愈创木酚模拟废水的研究

Preparation of Polystyrene/Fe3O4 Suspension Filler and Fenton-like Treatment of Guaiacol Simulated Wastewater

中文关键词:  纳米Fe₃O₄  PS/Fe₃O₄悬浮填料  类Fenton反应  愈创木酚

Key Words:nano Fe₃O₄  PS@Fe₃O₄ suspended filler  Fenton-like reaction  guaiacol

中文摘要:

      均相芬顿（Fenton）处理废水存在化学药剂投加量大、铁泥产生量多的问题，类Fenton是有效的解决途径之一。本课题以羟基修饰的纳米Fe₃O₄（Fe₃O₄-OH）和苯乙烯（St）为主要原料，利用链式加聚反应合成聚苯乙烯（PS）/Fe₃O₄悬浮填料，用于类Fenton处理愈创木酚模拟废水。分别用傅里叶变换红外光谱仪（FT-IR）、热重分析仪（TGA）、超景深显微镜、扫描电子显微镜（SEM）、X射线能谱仪（EDS）对PS/Fe₃O₄悬浮填料进行分析和表征，发现PS/Fe₃O₄悬浮填料具有Fe₃O₄-OH和PS的双层复合结构，其中Fe₃O₄的质量占比为51.6%。对比研究了PS/Fe₃O₄悬浮填料和纳米Fe₃O₄类Fenton降解愈创木酚的效果，发现PS/Fe₃O₄悬浮填料的处理效果更优，在最佳工艺条件：初始pH值为4，m（COD_Cr）∶m（H₂O₂）=1∶1.5，悬浮填料投加量为0.8 g/L，反应时间为120 min下，愈创木酚降解率达到88.63%。通过自由基猝灭实验证明Fe₃O₄修饰前后愈创木酚的类Fenton降解体系的主要活性自由基仍为·OH。

Abstract:

      Fenton-like reaction is one of the effective solutions to the problems of large dosage of chemical agents and large amount of iron mud production in homogeneous Fenton. In this study， polystyrene （PS）/Fe₃O₄ suspension filler was synthesized with Fe₃O₄-OH and styrene （St） as main raw materials by chain polymerization reaction， which was used for Fenton-like treatment of guaiacol simulated wastewater. Fourier transform infrared spectroscopy （FT-IR）， thermogravimetry （TGA）， ultra-depth of field microscope， scanning electron microscope （SEM） and X-ray energy spectrometry （EDS） were used to analyze and characterize the suspension fillers， and it was found that PS/Fe₃O₄ suspension fillers had a double-layer composite structure of Fe₃O₄-OH and polystyrene. The mass ratio of Fe₃O₄ is 51.6%. The degradation effect of PS/Fe₃O₄ suspension filler and nano Fe₃O₄ Fenton-like system on guaiacol was compared and studied. It was found that the treatment effect of PS/Fe₃O₄ suspension filler was better， and the optimal process conditions were as follows： The initial pH value was 4， m（COD_Cr）∶m（H₂O₂）=1∶1.5， the dosage of suspension filler was 0.8 g/L， the reaction time was 120 min， and the degradation rate of guaiacol reached 88.63%. The free radical quenching experiment showed that the main active free radical in the Fenton-like degradation system of guaiacol before and after Fe₃O₄ modification was ·OH.