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Immobilization of chitosan-templated MnO2 nanoparticles onto filter paper by redox method as a retrievable Fenton-like dip catalyst
- Source :
- Chemosphere. 268:128835
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- By exploiting the hydrophilicity of cellulose filter paper (FP) and the excellent chelating property of chitosan (CH) for Mn2+, we have designed an efficient and retrievable dip catalyst MnO2/CH-FP for Fenton-like degradation of methylene blue (MB) over a wide pH range from 2.8 to 11.2. The MnO2 nanoparticles were uniformly immobilized in the CH-FP matrix by in-situ redox precipitation method where Mn(NO3)2 was treated with KMnO4 at mild conditions. A series of MnO2/CH-FP hybrids with different MnO2 loading were fabricated via varying concentration of Mn(NO3)2 solution, and their structure-function relationships were discussed based on detailed characterization. The optimal catalyst 1.0MnO2/CH-FP could cooperate with multiple low-concentration dosages of H2O2 to efficiently degrade 95.6% MB in 90 min (50 mg L−1 MB, 1 g L−1 catalyst, 30 mg L−1 H2O2, pH 7). It is also shown that 1.0MnO2/CH-FP could still keep 83.3% degradation efficiency of MB after six cycles. Moreover, the activity of this composite greatly surpassed that of bare MnO2 for nearly 50%, owing to its larger surface area and more accessible active sites. This method for preparing MnO2/CH-FP could effectively avoid the agglomeration of MnO2 nanoparticles and make the reaction turn on/off almost instantaneously by mere insertion/removal.
- Subjects :
- Environmental Engineering
Materials science
Filter paper
Precipitation (chemistry)
Health, Toxicology and Mutagenesis
0208 environmental biotechnology
Public Health, Environmental and Occupational Health
Nanoparticle
02 engineering and technology
General Medicine
General Chemistry
010501 environmental sciences
01 natural sciences
Pollution
Redox
020801 environmental engineering
Catalysis
Chitosan
chemistry.chemical_compound
chemistry
Chemical engineering
Environmental Chemistry
Degradation (geology)
Cellulose
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 00456535
- Volume :
- 268
- Database :
- OpenAIRE
- Journal :
- Chemosphere
- Accession number :
- edsair.doi...........91bbfb8dcf89380c7af5c9f399b0359d