Hierarchical MnO2 nanoflowers blooming on 3D nickel foam: A novel micro-macro catalyst for peroxymonosulfate activation

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:571

Article

Yuan, Ruixia¹  Jiang, Zhongqiu¹  Wang, Zhaohui^2,3,4  Gao, Simeng¹  Liu, Zhanjian¹  Li, Meiling¹  Boczkaj, Grzegorz⁵ 

[1] Northeast Petr Univ, Coll Chem & Chem Engn, Daqing 163318, Peoples R China

[2] East China Normal Univ, Sch Ecol & Environm Sci, Shanghai Key Lab Urban Ecol Proc & Ecorestorat, Shanghai 200241, Peoples R China

[3] Inst Ecochongming IEC, Shanghai 200062, Peoples R China

[4] Minist Nat Resources, Technol Innovat Ctr Land Spatial Ecorestorat Metr, 3663 N Zhongshan Rd, Shanghai 200062, Peoples R China

[5] Gdansk Univ Technol, Fac Chem, Dept Proc Engn & Chem Technol, 11-12 Narutowicza St, PL-80233 Gdansk, Poland

关键词: Sulfate radical;    Peroxymonosulfate;    Manganese oxide;    Nickel foam;    Hierarchical structure;   

DOI  :  10.1016/j.jcis.2020.03.041

来源: Elsevier

【 摘 要 】

In this work, birnessite-type delta-MnO2 nanoflowers were uniformly deposited on 3D nickel foam (NF) by one-step hydrothermal route for high-efficient activation of peroxymonosulfate (PMS) towards degradation of acid orange 7 (AO7). High specific surface area, large pore volume and 3D hierarchical structure promotes the mass and electron transfer for great catalytic activity. Low reaction energy barrier (E-a = 2 7.5 kJ/mol) and outstanding reusability with extremely low manganese leaching during recycling (<0.06 mg/L) was achieved due to the 3D hierarchical structure which could effectively avoid the agglomeration of nano-sized MnO2 center dot SO4(center dot) was confirmed to be the predominant reactive species for AO7 decomposition by electron spin resonance and quenching tests. The synergistic catalytic mechanism of MnO2/NF and the role of inner-sphere complexation between the active sites of MnO2 and peroxymonosulfate were thoroughly investigated. Compared with traditional nano/micro-sized catalysts, 3D macroscopic MnO2/NF with facile recovery and high stability potentially facilitates fascinating applications as green heterogeneous catalysis approach. (C) 2020 Elsevier Inc. All rights reserved.

【 授权许可】

Free