Preparation of Polyaniline Microtubes as the Gold Catalyst Support with Improved Catalytic Performances for the Reduction of Nitrophenols
Preparation of Polyaniline Microtubes as the Gold Catalyst Support with Improved Catalytic Performances for the Reduction of Nitrophenols
复制标题
聚苯胺微管作为金催化剂载体的制备，提高硝基酚还原的催化性能
DOI：
10.1007/s11244-020-01385-x
复制
发表时间：
2020-09-30
影响因子：
3.6
通讯作者：
Qi, Caixia
中科院分区：
文献类型：
--
作者：
Sun, Libo;Jiang, Lin;Qi, Caixia
制备了聚苯胺（PANI）微管负载Au催化剂，并以NaBH 4为还原剂对硝基酚类化合物进行了催化还原。以水杨酸为掺杂剂，采用无模板法制备聚苯胺微管。HAuCl 4被用作金的前体。通过PANI和HAuCl 4之间的原位氧化还原反应将Au纳米颗粒负载在PANI微管上。采用SEM、TEM、FT-IR、XRD和拉曼光谱等手段对PANI/Au复合催化剂的形貌和结构进行了表征。我们发现，金属Au纳米粒子通过原位氧化还原反应负载在聚苯胺上，并且位于聚苯胺的亚胺氮附近。PANI与Au纳米粒子之间的相互作用使金属Au带负电荷，有利于提高催化剂对4-硝基苯酚（4-NP）的还原活性。对3-硝基苯酚（3-NP）和2-硝基苯酚（2-NP）的催化还原性能进行了比较研究，结果表明PANI/Au催化剂对3-NP的催化还原活性顺序为3-NP > 2-NP > 4-NP。
Polyaniline (PANI) microtubes supported Au catalysts were prepared and evaluated in the catalytic reduction of nitrophenols to aminophenols with NaBH4as the reductant. PANI microtubes were prepared through a template-free method with salicylic acid as the dopant. HAuCl4was 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.