Polyaniline (PANI) microtubes supported Au catalysts were prepared and evaluated in the catalytic reduction of nitrophenols to aminophenols with NaBH₄ as the reductant. PANI microtubes were prepared through a template-free method with salicylic acid as the dopant. HAuCl₄ was used as a gold precursor. Au nanoparticles were loaded on PANI microtubes by an in situ redox reaction between PANI and HAuCl₄. The morphology and structure of the as-prepared PANI/Au composite catalyst were investigated using SEM, TEM, FT-IR, XRD and Raman spectra. We found that the metallic Au nanoparticles were loaded on PANI through the in situ redox reaction and located closer to the imine nitrogens of PANI. And the interaction between PANI and Au nanoparticles led the metallic Au negatively charged and favored the improvement of catalytic activities in the reduction of 4-nitrophenol (4-NP). A comparative study for the catalytic reduction of 3-nitrophenol (3-NP) and 2-nitrophenol (2-NP) showed that the activity sequence of PANI/Au was 3-NP > 2-NP > 4-NP.

制备了载有Au催化剂的聚苯胺（PANI）微管，并用NaBH ₄作为还原剂将硝基苯酚催化还原为氨基酚。通过无模板法以水杨酸为掺杂剂制备PANI微管。HAuCl ₄用作金前体。通过PANI和HAuCl ₄之间的原位氧化还原反应将Au纳米颗粒加载到PANI微管上。使用SEM，TEM，FT-IR，XRD和拉曼光谱研究了制备的PANI / Au复合催化剂的形貌和结构。我们发现金属金纳米颗粒通过原位氧化还原反应负载在PANI上，并且更靠近PANI的亚胺氮。PANI与Au纳米颗粒之间的相互作用导致金属Au带负电，有利于提高4-硝基苯酚（4-NP）的催化活性。对3-硝基苯酚（3-NP）和2-硝基苯酚（2-NP）进行催化还原的比较研究表明，PANI / Au的活性顺序为3-NP> 2-NP> 4-NP。