Xie Liangbo, Mi Xueyue, Liu Yigang, Li Yi, Sun Yan, Zhan Sihui, Hu Wenping
Tianjin 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.
Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), College of Environmental Science and Engineering , Nankai University , Tianjin 300071 , China.
ACS Appl Mater Interfaces. 2019 Aug 28;11(34):30703-30712. doi: 10.1021/acsami.9b06396. Epub 2019 Aug 13.
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 CeZrO solid solution (Fe-CeZrO) 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-CeZrO/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-CeZrO/CF, while the value was only 38.01% in the absence of Fe-CeZrO. 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-CeZrO/CF composite is an efficient and promising electrode for the removal of PAM in wastewater.
环境水体中的聚丙烯酰胺（PAM）因其分子量高、耐腐蚀、高粘度以及不被土壤吸附等特性，已成为水污染治理中的一个主要问题。通过水热合成法制备了负载在碳毡（CF）上的铁掺杂铈锆固溶体（Fe-CeZrO）复合材料，并将其用作非均相电芬顿体系中降解PAM的阴极。结果表明，Fe-CeZrO/CF阴极对PAM的降解效率在120分钟后达到86%，300分钟后PAM的分子量降低了90%以上。在Fe-CeZrO/CF存在的情况下，总有机碳去除率达到78.86%，而在没有Fe-CeZrO的情况下该值仅为38.01%。进一步研究表明，链的断裂始于酰胺键，然后碳链裂解为短烷基链。随着降解的进行，PAM溶液的复数粘度和弹性模量在300分钟时均下降了近50%。这表明·OH是降解PAM的最主要活性物种。这种新型的Fe-CeZrO/CF复合材料是一种用于去除废水中PAM的高效且有前景的电极。
