Synthesis of Magnetic Carbon Supported Manganese Catalysts for Phenol Oxidation by Activation of Peroxymonosulfate

Abstract

Magnetic core/shell nanospheres (MCS) were synthesized by a novel and facile one-step hydrothermal method. Supported manganese oxide nanoparticles (Fe 3 O 4 /C/Mn) were obtained from various methods (including redox, hydrothermal and impregnation) using MCS as the support material and potassium permanganate as the precursor of manganese oxide. The Mn/MCS catalysts were characterized by a variety of characterization techniques and the catalytic performances of Fe 3 O 4 /C/Mn nanoparticles were tested in activation of peroxymonosulfate to produce reactive radicals for phenol degradation in aqueous solutions. It was found that Fe 3 O 4 /C/Mn catalysts can be well dispersed and easily separated from the aqueous solutions by an external magnetic field. Kinetic analysis showed that phenol degradation on Fe 3 O 4 /C/Mn catalysts follows the first order kinetics. The peroxymonosulfate activation mechanism by Fe 3 O 4 /C/Mn catalysts for phenol degradation was then discussed.

Preparation and Catalytic Performance of Expanded Graphite for Oxidation of Organic Pollutant

“…The decolorization of AR97 solution was monitored by measuring the maximum absorbance at λ = 497 nm with a Shimadzu UV2501 spectrophotometer (Tokyo, Japan). The AR97 removal ratio is calculated in Equation 9: degradation efficiency = (1 − Ct/C0) × 100% (9) ln (C0/Ct) = kobst (10) The initial first-order rate constant, k, was obtained by Equation 10, where Ct and C0 were the AR97 concentration at time t and the initial concentration, respectively.…”

“…Transition metals (Fe(II), Zn(0), Fe(0)) catalysis [5][6][7][8] demonstrated the very simple and efficient homogeneous/ heterogeneous radical-based processes. On the other hand, heterogeneous processes with metal oxides or metal oxides-based catalysts, such as Fe 3 O 4 , MnFe 2 O 4 , Fe 3 O 4 /C/Mn hybrids, and α-MnO 2 , have drawn much attention recently due to their excellent performance [9][10][11][12]. The mechanism of activation of PDS and PMS by transition metal ions and metal oxide could be explained by Equations (1) and (2).…”

Natural manganese ores for efficient removal of organic pollutants via catalytic peroxymonosulfate‐based advanced oxidation processes

“…Natural ores are attractive for their low cost, abundant availability, and comparable performance to synthetic catalysts, 17 especially for Earth's 12th most abundant element, Mn 18,19 . Several Mn oxides, that is, Mn monoxide, Mn dioxide, and Mn trioxide, have displayed high catalytic performance in PMS‐AOP systems and for POP degradation 20,21 . Similarly, natural Mn ore (MO) comprises various Mn compounds that may display good catalytic performance for POP degradation.…”

“…18,19 Several Mn oxides, that is, Mn monoxide, Mn dioxide, and Mn trioxide, have displayed high catalytic performance in PMS-AOP systems and for POP degradation. 20,21 Similarly, natural Mn ore (MO) comprises various Mn compounds that may display good catalytic performance for POP degradation.…”

Heterogeneous Catalysis for Environmental Remediation

“…Wang et al [1] synthesized magnetic carbon supported manganese oxides (Fe 3 O 4 /C/Mn), which could effectively activate peroxymonosulfate (PMS) for phenol mineralization. The redox Mn 4+ /Mn 3+ couple is the catalytic site for radical generation and the magnetic Fe 3 O 4 counterpart not only serves as a support but also results in easy separation of the catalyst from the water by an external magnetic field.…”