Abstract
Biopolymer (BioP) was extracted from waste activated sludge and the ternary catalyst BioP@PANI@Fe3O4 was prepared by biomimetic method. Control experiments proved the synergistic effects of the components in BioP@PANI@Fe3O4. The degradation of high concentration of model pollutant proved its good performance as the heterogeneous Fenton catalyst.The high utilization efficiency of H2O2 and wide oprational pH range showed the promising application of BioP@PANI@Fe3O4 in the oxidative degradation of organic pollutants. The possible reaction mechanism on the surface of BioP@PANI@Fe3O4 lies in that PANI provide the acidic condition and the initially generated ≡Fe(II) species react with H2O2 to generate •OH, which destroy the organic dyes adsorbed onto catalyst surface. The redox process Fe(III)→Fe(II) take place easily due to convenient electro transfer in PANI and reduction power of functional groups in BioP.
Highlights
Fenton processes were invested to destruct organic pollutants widely since the Fenton was discovered[1] and they performed high degradation efficiency
Our previous study showed that composite of polyaniline (PANI) and nano Fe3O4 have some advantages such as wide operational pH range, high catalytic activity, high utilization efficiency of H2O2 and low iron concentration in water as the heterogenerous Fenton catalyst[8]
The small amount of dyes diminished in Fe3O4/H2O2, PANI/H2O2 and BioP@PANI/H2O2 system is ascribed to the catalytic activity of nano-Fe3O4 and PANI for H2O2[2, 15, 16]
Summary
Fenton processes were invested to destruct organic pollutants widely since the Fenton was discovered[1] and they performed high degradation efficiency. The necessity to acidify the reaction medium limits the applicability in the dyeing wastewater treatment Another inhibition lies in the iron sludge generated during the reaction, which is dangerous solids waste and may cause secondary pollution[3, 7]. HA coated Fe3O4 exhibited high Fenton-like catalytic ability during the mineralization of sulfathiazole[2] These works indicated that the introduction of biopolymer into nanocomposites can improve their performance. Biopolymer (BioP) was extracted from WAS and successfully used for preparing the ternary BioP@PANI@Fe3O4 catalyst for the first time This application of BioP provided a new resource recovery and effective reduction way for large quality of WAS. The catalytic activity and synergistic effects were evaluated using the model dyes and the possible synergistic mechanisms of the components were analyzed in this study
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