Mixed-valence mesoporous manganese oxide spheres from waste manganese nitrate aqueous solution

2019 ◽  
Vol 284 ◽  
pp. 353-359 ◽  
Author(s):  
Andrzej Sienkiewicz ◽  
Agnieszka Kierys ◽  
Marta Grochowicz ◽  
Aldona Nowicka ◽  
Jacek Goworek
Keyword(s):  
Aqueous Solution ◽  
Manganese Oxide ◽  
Mixed Valence ◽  
Manganese Nitrate

scholarly journals Adsorption of Mn2+ from Aqueous Solution Using Manganese Oxide-Coated Hollow Polymethylmethacrylate Microspheres (MHPM)

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Dhiraj Dutta ◽  
Jyoti Prasad Borah ◽  
Amrit Puzari
Keyword(s):  
Aqueous Solution ◽  
Manganese Oxide ◽  
Adsorption Capacity ◽  
High Surface ◽  
High Surface Area ◽  
Freundlich Isotherm ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Coated Sand

Results of investigation on adsorption of Mn2+ from aqueous solution by manganese oxide-coated hollow polymethylmethacrylate microspheres (MHPM) are reported here. This is the first report on Mn-coated hollow polymer as a substitute for widely used materials like green sand or MN-coated sand. Hollow polymethylmethacrylate (HPM) was prepared by using a literature procedure. Manganese oxide (MnO) was coated on the surface of HPM (MHPM) by using the electroless plating technique. The HPM and MHPM were characterized by using optical microscopy (OM), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). Optical and scanning micrographs were used to monitor the surface properties of the coated layer which revealed the presence of MnO on the surface of HPM. TGA showed the presence of 4-5% of MnO in MHPM. Adsorption isotherm studies were carried out as a function of pH, initial ion concentration, and contact time, to determine the adsorption efficiency for removal of Mn2+ from contaminated water by the synthesized MHPM. The isotherm results showed that the maximum adsorption capacity of MnO-coated HPM to remove manganese contaminants from water is 8.373 mg/g. The obtained R 2 values of Langmuir isotherm and Freundlich isotherm models were 1 and 0.87, respectively. Therefore, R 2 magnitude confirmed that the Langmuir model is best suited for Mn2+ adsorption by a monolayer of MHPM adsorbent. The material developed shows higher adsorption capacity even at a higher concentration of solute ions, which is not usually observed with similar materials of this kind. Overall findings indicate that MHPM is a very potential lightweight adsorbent for removal of Mn2+ from the aqueous solution because of its low density and high surface area.

Mixed-valence Manganese Oxide Catalysed Oxidation of Benzyl Alcohol and Cyclohexanol in the Liquid Phase

2014 ◽  
Vol 39 (4) ◽  
pp. 375-390 ◽  
Author(s):  
Mohammad Ilyas ◽  
Muhammad Saeed ◽  
Mohammad Sadiq ◽  
Mohsin Siddique
Keyword(s):  
Liquid Phase ◽  
Manganese Oxide ◽  
Benzyl Alcohol ◽  
Mixed Valence ◽  
Oxidation Of Benzyl Alcohol ◽  
Catalysed Oxidation

scholarly journals Effect of Potassium Ions on the Formation of Mixed-Valence Manganese Oxide/Graphene Nanocomposites

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1245 ◽  
Author(s):  
Wooree Jang ◽  
Dae-Young Jeon ◽  
Youn-Sik Lee ◽  
Hye Young Koo
Keyword(s):  
Graphene Oxide ◽  
Manganese Oxide ◽  
Mixed Valence ◽  
High Specific Capacitance ◽  
Potassium Ions ◽  
Electrochemical Supercapacitors ◽  
One Pot ◽  
Graphene Nanocomposites ◽  
Reduced Graphene ◽  
A Current

One-pot synthesis of mixed-valence manganese oxide (MnOx)/potassium ion-doped reduced graphene oxide (rGO) composites for efficient electrochemical supercapacitors is introduced. Using manganese nitrate and potassium permanganate as co-precursors for the MnOx and by directly annealing the rGO without tedious purification steps, as described herein, MnOx/rGO composites with a high specific capacitance of 1955.6 F g−1 at a current density of 1 A g−1 are achieved. It is found that the presence of potassium ions helps in the development of mixed-valence MnOx on the surface of the rGO.

scholarly journals Removal of Methylene Blue from Aqueous Solution Using a Polarizable Nanolayered Manganese Oxide Film

2009 ◽  
Vol 25 (2) ◽  
pp. 229-233 ◽  
Author(s):  
Masaharu NAKAYAMA ◽  
Shinya NAKAMOTO ◽  
Chihiro IIDA ◽  
Makoto YOSHIMOTO
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Oxide Film ◽  
Manganese Oxide

Copper(II) and lead(II) removal from aqueous solution in fixed-bed columns by manganese oxide coated zeolite

2006 ◽  
Vol 137 (2) ◽  
pp. 934-942 ◽  
Author(s):  
Runping Han ◽  
Weihua Zou ◽  
Hongkui Li ◽  
Yanhu Li ◽  
Jie Shi
Keyword(s):  
Aqueous Solution ◽  
Manganese Oxide ◽  
Fixed Bed
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