有机膨润土负载纳米铁类Fenton法去除水中2,4-二氯酚

Fenton-like Oxidation of 2,4-DCP in Aqueous Solution Using Organobentonite Loaded nZVI

利用十六烷基三甲基铵盐改性的膨润土(DK1),采用液相还原法制备DK1负载纳米零价铁(n ZVI/DK1),并结合类Fenton法研究水溶液中的2,4-二氯苯酚(2,4-DCP)的去除.分别考察了DK1吸附,n ZVI/DK1吸附还原,n ZVI/H2O2类Fenton氧化,n ZVI/DK1/H2O2类Fenton氧化四种方法对水溶液中2,4-DCP的去除效果,同时探讨了不同因素如初始p H值、H2O2浓度、n ZVI/DK1投加量、2,4-DCP初始质量浓度对2,4-DCP去除的影响.结果表明:DK1,n ZVI/DK1,n ZVI/H2O2,n ZVI/DK1/H2O2对2,4-DCP的去除率分别为29.0%,45.7%,20.2%,71.1%.深入研究不同因素对2,4-DCP去除效果影响的结果发现,p H值、H2O2浓度控制着Fe0在Fenton中活性以及催化性,从而显著影响着2,4-DCP的降解率.在p H 3.0,H2O2浓度为10 mmol·L-1,n ZVI/DK1投加量质量浓度为0.5 g·L-1,2,4-DCP初始质量浓度50mg·L-1时,2,4-DCP去除率达到93.4%.溶液COD去除率高达78.6%,进一步证明n ZVI/DK1在类Fenton法中具有吸附和降解性能.

Sixteen alkyl three methyl ammol/Lonium salt modified bentonite（DK1） was used for preparation of supported nano zero valent iron（nZVI/DK1）,combined with Fenton method for removal of 2,4-DCP in aqueous solution. The different influences such as the initial pH value,H2O2 concentration,nZVI/DK1 dosage,2,4-DCP initial concentration on 2,4-DCP removal were observed. The results showed that the 2,4-DCP removal efficiency were 29. 0%,45. 7%,20. 2%,71. 1% by DK1,nZVI/DK1,nZVI/H2O2,nZVI/DK1 /H2O2,respectively. And the hydrophobic clay support nZVI enhanced the removal efficiency of 2,4-DCP. The p H value of solution,H2O2 concentration were in control of Fe0 activity in Fenton and catalysis,which significantly influenced the degradation of 2,4-DCP. At the condition of pH 3,H2O2 concentration 10 mmol·L^- 1,nZVI/DK1 dosage 0. 5 g·L^- 1,2,4-DCP initial concentration 50 mg·L^- 1,2,4-DCP removal efficiency reached 93. 4%. While the COD removal efficiency can reach as high as 78. 6%,it is further proved that nZVI/DK1 has the function of adsorption and degradation in Fenton method.