基于钯修饰的介孔TiO_(2)纳米棒高效光降解四环素的研究

Study on palladium modified mesoporous TiO_(2)nanorods for efficient photodegradation of tetracycline

致力于开发一种高性能光催化剂,专门用于环境净化中四环素(TC)的有效降解。通过静电纺丝技术和硼氢化钠还原法,成功制备了金属钯颗粒均匀负载的介孔二氧化钛(Pd/mTiO_(2)NRs)纳米棒复合光催化剂。随后,对这些复合材料进行了光催化降解TC的活性评估实验。实验结果显示,具有3%最佳Pd负载量的Pd/mTiO_(2)NRs纳米复合物在光降解TC方面展现出了卓越的催化性能。在短短1 h的光反应后,TC的去除率高达96.4%,这一效率比单独的mTiO_(2)NRs(去除率约为67.1%)提高了约1.45倍。进一步利用准一级动力学模型分析,研究发现Pd/mTiO_(2)NRs具有非常高的降解速率常数,达到0.05358 min^(-1),这一数值是单独mTiO_(2)NRs(0.01068 min^(-1))的5倍之多。更重要的是,经过5次循环使用后,该复合光催化剂的光催化效率几乎保持不变,证明了其良好的结构稳定性和可循环使用性。该研究不仅为开发高效光催化剂提供了新的研究思路,而且为环境净化领域提供了有力的技术支持,为解决实际环境问题提供了有效的解决方案。

This study aims to develop a highperformance photocatalyst specifically designed for the effective degradation of tetracycline(TC)in environmental purification.The composite of mesoporous titanium dioxide nanorods uniformly loaded with palladium metal particles(Pd/mTiO_(2)NRs)was successfully prepared using electrospinning technology and sodium borohydride reduction method.Subsequently,the photocatalytic activity for TC degradation on these catalysts was evaluated.The experimental results showed that the Pd/mTiO_(2)NRs nanocomposites with an optimal Pd loading capacity of 3%demonstrated an excellent catalytic performance in photodegradation of TC.After 1 h of photoreaction,the removal rate of TC over the Pd/mTiO_(2)NRs catalyst was as high as 96.4%,which was about 1.45 times higher than that of the single mTiO_(2)NRs(removal rate 67.1%).Further analysis using a pseudofirstorder kinetic model revealed that the Pd/mTiO_(2)NRs sample possessed a very high degradation rate constant,reaching k=0.05358 min^(-1),which was more than 5 times that of mTiO_(2)NRs(0.01068 min^(-1)).More importantly,after 5 cycles of use,the photocatalytic efficiency of the the Pd/mTiO_(2)NRs composite remained almost unchanged,demonstrating its good structural stability and recyclable.The present study not only provided new research ideas for the development of efficient photocatalysts,but also offered strong technical support for the field of environmental purification and effective approaches for solving practical environmental problems.