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Published on: November 15, 2016
Highly Efficient Degradation of Polyacrylamide by an Fe-Doped Ce0.75Zr0.25O2 Solid Solution/CF Composite Cathode in a
Liangbo Xie1, Xueyue Mi2, Yigang Liu3
1Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science , Tianjin University & Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) , Tianjin 300072 , China.
Abstract:
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 Ce0.75Zr0.25O2 solid solution (Fe-Ce0.75Zr0.25O2) 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-Ce0.75Zr0.25O2/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-Ce0.75Zr0.25O2/CF, while the value was only 38.01% in the absence of Fe-Ce0.75Zr0.25O2. 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 •OH were the most significant active species for the degradation of PAM. This novel Fe-Ce0.75Zr0.25O2/CF composite is an efficient and promising electrode for the removal of PAM in wastewater.
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