Electrochemical/Peroxymonosulfate/NrGO-MnFe2O4 for Advanced Treatment of Landfill Leachate Nanofiltration Concentrate

Abstract

A simple one-pot method was used to successfully embed manganese ferrite (MnFe2O4) nanoparticles on the nitrogen-doped reduced graphene oxide matrix (NrGO), which was used to activate peroxymonosulfate to treat the landfill leachate nanofiltration concentration (LLNC) with electrochemical enhancement. NrGO-MnFe2O4 and rGO-MnFe2O4 were characterized by various means. This indicates that nitrogen-doped could induce more graphene oxide (GO) spall and reduction to produce more active centers, and was favorable for uniformly loading MnFe2O4 particles. The comparison between electrochemical/peroxymonosulfate/NrGO-MnFe2O4 (EC/PMS/NrGO-MnFe2O4) system and different catalytic systems shows that electrochemical reaction, NrGO and MnFe2O4 can produce synergies, and the chemical oxygen demand (COD) removal rate of LLNC can reach 72.89% under the optimal conditions. The three-dimensional (3D-EEM) fluorescence spectrum shows that the system has a strong treatment effect on the macromolecules with intense fluorescence emission in LLNC, such as humic acid, and degrades into substances with weak or no fluorescence characteristics. Gas chromatography-mass spectrometry (GC-MS) indicates that the complex structure of refractory organic compounds can be simplified, while the simple small molecular organic compounds can be directly mineralized. The mechanism of catalytic degradation of the system was preliminarily discussed by the free radical quenching experiment. Therefore, the EC/PMS/NrGO-MnFe2O4 system has significant application potential in the treatment of refractory wastewater.

Systematic Performance Comparison of Fe3+/Fe0/Peroxymonosulfate and Fe3+/Fe0/Peroxydisulfate Systems for Organics Removal

“…Control studies consisting of only AO7 + PMS, AO7 + PMS + Fe 3+ or Ac-ZVI, and AO7 only were also conducted. The effects of different Fe 3+ concentration (0-20 mg L −1 ), Ac-ZVI dosage (1-3 g L −1 ), pH (3)(4)(5)(6)(7)(8)(9), and PDS/PMS:AO7 mol ratio (10:1-100:1) on AO7 degradation were studied. The pH was adjusted using diluted HCl and NaOH.…”

“…•and • OH are 2.5-3.2 and 1.8-2.7 V, respectively [6][7][8]) and can be employed to degrade organic pollutants in water.…”

“…Both PMS and PDS consist of a peroxide bond that can be activated by a catalyst through an electron transfer reaction to produce reactive oxygen species (ROS), such as SO 4 •– and • OH. These ROS have high oxidation potential (E° vs. NHE for SO 4 •– and • OH are 2.5–3.2 and 1.8–2.7 V, respectively [ 6 , 7 , 8 ]) and can be employed to degrade organic pollutants in water.…”

Organic matter and nutrients removal from landfill leachate by airlift aerobic three‐phase fluidized bed reactor

“…Mature LL (eg, from landfills of more than 5–10 years of age), have a very low biodegradability (BOD 5 /COD < 0.1) to be treated efficiently by biological methods and cannot effectively remove organic matter from the leachate. [ 8,14,15 ]…”

Synthesis, Structure, and Antimicrobial Performance of NixZn1−xFe2O4 (x = 0, 0.3, 0.7, 1.0) Magnetic Powders toward E. coli, B. cereus, S. citreus, and C. tropicalis

“…Since the discovery of ferrites in the middle of the last century, an intensive study of the possibility to improve their functional properties by modifying the structural, morphological, and microstructural parameters has been constantly conducted. Currently, a large number of works have been published, in which the influence of doping cations of transition metals on the magnetic and electrical properties of both initial ferrite powders and final ceramic materials has been thoroughly studied [6][7][8][9]. Among the whole variety of ferrites, stand out.…”