Publication | Closed Access
Highly Efficient Degradation of Polyacrylamide by an Fe-Doped Ce<sub>0.75</sub>Zr<sub>0.25</sub>O<sub>2</sub> Solid Solution/CF Composite Cathode in a Heterogeneous Electro-Fenton Process
33
Citations
47
References
2019
Year
Polyacrylamide (PAM) in environmental water has become a major problem in water pollution management due to its high molecular mass, corrosion resistance, high viscosity, and nonabsorption by soil. The composite of Fe-doped Ce<sub>0.75</sub>Zr<sub>0.25</sub>O<sub>2</sub> solid solution (Fe-Ce<sub>0.75</sub>Zr<sub>0.25</sub>O<sub>2</sub>) loaded on carbon felt (CF) was fabricated by a hydrothermal synthesis method, which was used as the cathode in a heterogeneous electro-Fenton system for the degradation of PAM. It showed that the degradation efficiency of PAM by the Fe-Ce<sub>0.75</sub>Zr<sub>0.25</sub>O<sub>2</sub>/CF cathode was 86% after 120 min and the molecular mass of PAM decreased by more than 90% after 300 min. Total organic carbon removal reached 78.86% in the presence of Fe-Ce<sub>0.75</sub>Zr<sub>0.25</sub>O<sub>2</sub>/CF, while the value was only 38.01% in the absence of Fe-Ce<sub>0.75</sub>Zr<sub>0.25</sub>O<sub>2</sub>. Further studies showed that the breaking of the chain begins with the amide bond, and then, the carbon chain was cracked into a short alkyl chain. As degradation progressed, both the complex viscosity and elasticity modulus of PAM solutions decreased nearly 50% at 300 min. It indicated that <sup>•</sup>OH were the most significant active species for the degradation of PAM. This novel Fe-Ce<sub>0.75</sub>Zr<sub>0.25</sub>O<sub>2</sub>/CF composite is an efficient and promising electrode for the removal of PAM in wastewater.
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