Fabrication of 3-D confined spaces with Au NPs: Superior dispersion and catalytic activity

TY - JOUR

T1 - Fabrication of 3-D confined spaces with Au NPs

T2 - Superior dispersion and catalytic activity

AU - Subhan, Fazle

AU - Aslam, Sobia

AU - Yan, Zifeng

AU - Ahmad, Ayaz

AU - Etim, U. J.

N1 - Publisher Copyright: © 2019 Elsevier Inc.

PY - 2019/3/22

Y1 - 2019/3/22

N2 - Gold nanoparticles (Au NPs) as an active noble-metal site have received great attention because of its superior catalytic activity in diverse reactions. However, the activity of Au NPs is strongly dependent on its size and dispersion degree. Therefore, we developed an efficient solid-state reduction (SSR) strategy for the first time to promote the dispersion degree and size of Au NPs in template-occluded KIT-6 (AK) as a support by taking advantage of (i) 3-dimentonal cubic mesoporous structure of support (ii) confined spaces present between template (Pluronic (P) 123) and silica wall of AK where Au NPs locate (iii) interaction of both P123 as template and silica walls of AK with Au NPs highly efficient for Au NPs dispersion and (iv) SSR strategy which avoids competitive adsorption of solvent in the conventional fabrication process. The results revealed that Au-based AK (AuAK) has much better dispersion of Au NPs with smaller sizes than template-free KIT-6 (CK). Moreover, the catalytic activity of AuAK in reduction reactions of p-nitrophenol (P-NP) to p-aminophenol (P-AP) and Methylene blue (MB) to Leuco MB (LMB) is superior than AuCK as well as to those Au-catalysts synthesized via conventional strategies previously. The catalytic performance is also related well with characterization results.

AB - Gold nanoparticles (Au NPs) as an active noble-metal site have received great attention because of its superior catalytic activity in diverse reactions. However, the activity of Au NPs is strongly dependent on its size and dispersion degree. Therefore, we developed an efficient solid-state reduction (SSR) strategy for the first time to promote the dispersion degree and size of Au NPs in template-occluded KIT-6 (AK) as a support by taking advantage of (i) 3-dimentonal cubic mesoporous structure of support (ii) confined spaces present between template (Pluronic (P) 123) and silica wall of AK where Au NPs locate (iii) interaction of both P123 as template and silica walls of AK with Au NPs highly efficient for Au NPs dispersion and (iv) SSR strategy which avoids competitive adsorption of solvent in the conventional fabrication process. The results revealed that Au-based AK (AuAK) has much better dispersion of Au NPs with smaller sizes than template-free KIT-6 (CK). Moreover, the catalytic activity of AuAK in reduction reactions of p-nitrophenol (P-NP) to p-aminophenol (P-AP) and Methylene blue (MB) to Leuco MB (LMB) is superior than AuCK as well as to those Au-catalysts synthesized via conventional strategies previously. The catalytic performance is also related well with characterization results.

KW - 3-D confined spaces

KW - Au NPs

KW - Catalytic reduction

KW - KIT-6

KW - SSR strategy

UR - http://www.scopus.com/inward/record.url?scp=85060047390&partnerID=8YFLogxK

U2 - 10.1016/j.jcis.2019.01.040

DO - 10.1016/j.jcis.2019.01.040

M3 - 文章

C2 - 30660794

AN - SCOPUS:85060047390

SN - 0021-9797

VL - 540

SP - 371

EP - 381

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

ER -