Insights into the interaction between <scp>PANI</scp> and Au <scp>NPs</scp> of magnetic core‐shell <scp>Fe<sub>3</sub>O<sub>4</sub></scp>/<scp>PANI</scp>/Au catalysts with remarkable catalytic performance in <scp>4‐NP</scp> reduction
Libo Sun, Jie Zhang, Zequn Yin, Miao Zhang, Yan Zhang, Yue Gao, Caixia Qi
Abstract
Abstract Magnetic Fe 3 O 4 /PANI core‐shell composites were prepared as the support of gold catalysts. The Fe 3 O 4 magnetic core was prepared by solvothermal reaction and coated with polyaniline (PANI) shell via in situ aniline polymerization on Fe 3 O 4 surface. Au nanoparticles were loaded on Fe 3 O 4 /PANI composites through gold sol adsorption and in situ reduction method to prepare Fe 3 O 4 /PANI/Au(Sol) and Fe 3 O 4 /PANI/Au(In Situ) catalysts, respectively. We found that the initial activities of Fe 3 O 4 /PANI/Au(Sol) were higher than that of Fe 3 O 4 /PANI/Au(In Situ) due to the small size effect of Au in catalysts. Although the size of Au in Fe 3 O 4 /PANI/Au(In Situ) was bigger than that in Fe 3 O 4 /PANI/Au(Sol), it should be noted that both of Fe 3 O 4 /PANI/Au(Sol) and Fe 3 O 4 /PANI/Au(In Situ) possessed good catalytic recycling stability. The conversion of 4‐NP was still above 97% and 99% after 15 cycles for Fe 3 O 4 /PANI/Au(Sol) and Fe 3 O 4 /PANI/Au(In Situ), respectively. The good catalytic stability for Fe 3 O 4 /PANI/Au(In Situ) could be attributed to the stronger interaction between PANI and Au NPs. We believe that our work provides an effective strategy for the preparation of long‐life catalysts and the investigations can be used to design other conductive polymers supported noble metal catalysts.