(Fe0.67Mn0.33)OOH riched in oxygen vacancies facilitated the PMS activation of modified EMR for refractory foaming agent removal from mineral processing wastewater

Li, Mengke; He, Zhiguo; Zhong, Hui; Sun, Wei; Hu, Liang; Luo, Maokang

doi:10.1016/j.cej.2022.136024

Cited by 28 publications

(5 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The increased defect degree of 3DG/A-MWCNTs significantly improves the number of active sites and catalytic activity . Furthermore, EPR spectroscopy was employed to identify the generation of oxygen vacancies or oxygen-containing active sites on the materials . As shown in Figure b, the 3DG/A-MWCNTs showed a more symmetrical signal peak than did the 3DG/MWCNTs and 3DG, suggesting the presence of several oxygen-containing active sites in the 3DG/A-MWCNTs.…”

Section: Resultsmentioning

confidence: 99%

A Fixed-Bed Reaction System Packed with a Graphene/Multiwalled Carbon Nanotube Scaffold for the Oxidative Removal of Naproxen

Liu,

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Most common adsorbents in research reports are powdered two-dimensional carbon materials, including powdered activated carbon and graphene, which tend to be lost during water treatment and cause secondary contamination. In this work, a hydrogel composed of three-dimensional graphene-doped acidified multiwalled carbon nanotubes (3DG/A-MWCNTs) was synthesized. The hydrogels with large specific surface areas and defect structures exhibited outstanding integration, compressive capacity, and negligible loss. The as-obtained material was added to a column as a continuous fixed-bed reactor (FBR). The 3DG/A-MWCNTs packed in the FBR exhibited superior adsorption and peroxymonosulfate (PMS) activation to achieve 56.2% naproxen (NPX) removal efficiency after 1150 min. The operation parameters were systematically optimized including the PMS concentration, initial pH, coexisting anions, bed height, and hydraulic retention time. Significantly, quenching, electron paramagnetic resonance, and electrochemical tests were used to demonstrate that reactive oxygen species (SO 4•− , • OH, O 2 •− , and 1 O 2 ) and electron transfer were involved in NPX degradation. The presence of active sites, oxygen vacancies, electron-rich, oxygen-containing functional groups, and defect structures within 3DG/A-MWCNTs promoted their preeminent catalytic activity. The FBR maintains a removal efficiency of 66.2% for NPX after six repetitions and exhibits excellent purification ability for various pollutants and actual surface water. These results suggest that FBR performs well in practical applications. Overall, this study expands the environmental application of three-dimensional graphene and provides promising metal-free carbon materials for eliminating refractory contaminants in continuous flow mode by using adsorption and PMS-based advanced oxidation processes.

show abstract

Section: Resultsmentioning

confidence: 99%

A Fixed-Bed Reaction System Packed with a Graphene/Multiwalled Carbon Nanotube Scaffold for the Oxidative Removal of Naproxen

Liu,

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…7a). 44 The COD values in the solution showed a signicant decrease aer the adsorption and degradation process, indicating a signicant reduction of organic matter in the system. The total organic carbon (TOC) value of the system was tested and used to evaluate its mineralization efficiency (Fig.…”

Section: Pms Activation By Xcn-mmt For Tc Degradationmentioning

confidence: 95%

Anchoring defective metal-free catalysts on montmorillonite nanosheets for tetracycline removal: synergetic adsorption-catalysis and mechanism insights

Li,

Liu,

Xie

et al. 2024

Environ. Sci.: Adv.

View full text Add to dashboard Cite

show abstract

“…The XRD patterns (Supplementary Figure S4) showed the MPs were mainly consisted of iron-manganese composite carboxyl oxide (Fe 0.67 Mn 0.33 ) OOH (PDF-#14-0,557) and Fe 2 O 3 (PDF-#33-0,664). This (Fe 0.67 Mn 0.33 )OOH molecule possessed abundant oxygen vacancies and -OH, which exhibited a strong affinity towards heavy metals (LI et al, 2022a).…”

Section: Simultaneous Immobilization Mechanism In Soilmentioning

confidence: 99%

Simultaneous immobilization of lead, cadmium and arsenic in soil by iron-manganese modified biochar

Yang,

Zeng,

Liu

et al. 2023

Front. Environ. Sci.

View full text Add to dashboard Cite

Cationic lead/cadmium and anionic arsenic exhibit opposite geochemical behaviors in soils, which makes the synchronous remediation of As, Cd, and Pb challenging. In this study, we developed an iron-manganese modified biochar (BC-Fe-Mn) that prepared from straw with iron (Fe) and manganese (Mn) loading at a pyrolysis temperature of 550 °C. After BC-Fe-Mn immobilization for 90 days, the simultaneous immobilization efficiency of Pb, Cd, and As reached 57%, 51%, and 35%, respectively. Speciation distributions shows that As transformed from specific bound state into weakly low crystallinity iron bound state. Cd transformed from carbonate fraction into Fe-Mn oxide bound fraction, and Pb transformed from carbonate fraction into residual state. During the procedure, simultaneous immobilization mechanisms might involve heavy metal morphological transformation, precipitation/co-precipitation, and surface complexation. Cd and Pb absorbed onto BC-Fe-Mn. Then the increased free iron oxides (Fed) reacted with the dissolved As to form iron-arsenic precipitation. The results show that BC-Fe-Mn is a promising material for the simultaneous immobilization of Pb, Cd, and As in multi-metal contaminated soil.

show abstract

(Fe0.67Mn0.33)OOH riched in oxygen vacancies facilitated the PMS activation of modified EMR for refractory foaming agent removal from mineral processing wastewater

Cited by 28 publications

References 43 publications

A Fixed-Bed Reaction System Packed with a Graphene/Multiwalled Carbon Nanotube Scaffold for the Oxidative Removal of Naproxen

A Fixed-Bed Reaction System Packed with a Graphene/Multiwalled Carbon Nanotube Scaffold for the Oxidative Removal of Naproxen

Anchoring defective metal-free catalysts on montmorillonite nanosheets for tetracycline removal: synergetic adsorption-catalysis and mechanism insights

Simultaneous immobilization of lead, cadmium and arsenic in soil by iron-manganese modified biochar

Contact Info

Product

Resources

About