manganese oxide Articles
-
Adsorption of Hg(II) from aqueous solution using functionalized hydrogel loaded with hydrous manganese dioxide particles
In this paper, a high performance adsorbent (hydrous manganese oxides onto acylamino and hydroxyl functionalized hydrogel) containing manganese oxide was prepared by the cross-linking polymer; the novel composite adsorbent has an excellent adsorption for Hg(II) removal. The adsorbent was characterized by scanning electron microscopy and Fourier transform infrared analysis, the hydrogel ...
-
Manganese oxidation and bacterial diversity on different filter media coatings during the start-up of drinking water biofilters
Manganese removal is a typical concern in drinking water production. Biofiltration may be used when treating groundwater sources but the onset of manganese removal in virgin biofilters can vary considerably. The aim of this study was to investigate the effect of different filter media on manganese oxidation and bacterial diversity in biofilters during the start-up. The onset of manganese ...
-
Comparison of removal of chromium (III) from aqueous solution by two kinds of modified diatomite: manganese-oxide-modified diatomite and microemulsion-modified diatomite
Crude Diatomites Modified by Microemulsion (DMM) and manganese oxide (MnD) are tested for the removal of chromium (III) in this study. The results indicate that zero point of charge (pHZPC) of DMM is 4.7 and that of MnD is 4.6. Both DMM and MnD show remarkable increase in the sorption capacity of chromium (III) when compared with untreated diatomite, and the removal of chromium (III) by DMM is ...
-
A Case Study: Overcoming Iron Bacteria Problems in South Africa
One of two articles published in the December issue of Borehole Water Journal, the magazine of the South African Borehole Water Association. Craig Jones from Midlands Pumps in South Africa is the BoreSaver partner of Geoquip Water Solutions Ltd. Craig outlines case studies that demonstrate the effectiveness of BoreSaver in treating iron oxide, manganese oxide, iron related bacterial and ...
-
Types of materials
A classification of materials, according to their behavior against a magnetic field, could be the following: Not Magnetic It does not facilitate or does not allow the passage of magnetic field lines. Example: the Void. Diamagnetic Weakly magnetic material. If a bar magnet is placed near it, it repels it. Example: Bismuth (Bi), Silver (Ag), Lead (Pb), Water. Paramagnetic It presents a very ...
-
Removal of arsenic from aqueous solution by iron-coated sand and manganese-coated sand having different mineral types
In this study, the effects of the coating temperature during the preparation of manganese-coated sand (MCS) and iron-coated sand (ICS) on the removals of As(III) and As(V) were evaluated. The mineral type of manganese oxide on MCS-150, prepared at 150 °C, was identified as a mixture of pyrolusite and ramsdellite, which changed to high crystalline pyrolusite above 300 °C. The mineral type of ...
-
Neptune Project Deliverable D2.1
Within WP2 in the Neptune project, promising technologies were developed and further investigated for sustainable wastewater treatment, where wastewater is regarded as a resource rather than as a waste. These technologies comprise microbial fuel cells for energy recuperation, denitrification and production of added value product. For the removal of micropollutants two new technologies were ...
-
Overcoming Iron Bacteria Problems in South Africa
One of two articles published in the December issue of Borehole Water Journal, the magazine of the South African Borehole Water Association. Craig Jones from Midlands Pumps in South Africa is the BoreSaver partner of Geoquip Water Solutions Ltd. Craig reviews the problems of iron bacteria and iron oxide contamination in South Africa and advocates an ongoing maintenance programme that ...
-
Fabrication of catalytic ceramic membranes for water filtration
The paper describes the use of the layer-by-layer technique to coat ceramic membranes with iron and manganese oxide nanoparticles. The coatings are thin (Escherichia coli bacteria.Keywords: ceramic membranes, fouling, membrane filtration, ozone, ...
-
Manganese-Promoted Oxidative Cyclization of Unsaturated Oximes Using Molecular Oxygen in Air under Ambient Conditions
A highly efficient manganese-promoted oxidative cyclization of unsaturated oximes to afford the corresponding 4,5-dihydroisoxazoline alcohols was developed. A very low loading (generally 0.1–0.2 mol-%) of Mn(acac)3 (acac = acetylacetonate) promoted the oxidative cyclization through the direct incorporation of molecular oxygen present in air (open flask) at room temperature. Continue ...
By SusChem
-
Influence of nitrite on the removal of Mn(II) using pilot-scale biofilters
Two pilot-scale biofilters were used to systematically investigate the influence of nitrite on biological Mn(II) removal. Gibbs free energy change (ΔG) of the redox reaction between MnO2 and NO2– was 122.28 kJ mol–1 in 298 K, suggesting that MnO2 could not react with NO2–. When nitrite in the influent was increased from 0.05 to 0.5 mg L–1, manganese oxides did not react with nitrite in ...
-
Coating techniques for glass beads as filter media for removal of manganese from water
Dry as well as wet coating techniques were developed to coat glass beads as filter media to remove manganese from water. For dry coating, powdered manganese oxide ore was fixed on the media surface. Wet coating was achieved by depositing synthetic manganese oxides onto the bead surface. The media were characterized by electron microscopy as well as by testing the removal of Mn2+ in a ...
-
Interactions between ammonia, iron and manganese removal using pilot-scale biofilters
Pilot-scale biofilters treated with real groundwater were established to systemically investigate the interactions between ammonia, iron and manganese removal. When both of ammonia and manganese in influent were about 1 mg/L, they were quickly removed; but when manganese was above 3 mg/L, ammonia removal was affected significantly. When total iron was above 5 mg/L, the oxidization rate of ...
-
Removal of methylene blue from water by γ-MnO2
Methylene blue (MB) is a cationic dyestuff, which is particularly resistant to biodegradation. The molecular sieved γ-MnO2 was used as an adsorbent/oxidant to remove the MB at room temperature and in visible light. The removal efficiency was mainly evaluated by X-ray diffractometer (XRD), UV–Vis spectrometer (UV–Vis), total organic carbon (TOC). The results revealed that the mechanisms of MB ...
-
Manganese-catalyzed degradation of phosphonic acids
Abstract The non-biodegradable and chemically very stable phosphonates are used in a variety of industrial applications including cooling waters, oil production and textile industry. We show here that they are degraded in the presence of Mn(II) and oxygen. The half-life for the reaction is 9 min near neutral pH. The presence of other cations such as Ca(II) and Zn(II) considerably slows down the ...
-
Effect of root exudates on pentachlorophenol adsorption by soil and its main chemical components
The relationship between root exudates (REs) and the adsorption of organic pollutants has important impacts on phytoremediation of organic contaminated soil. The effect of REs collected from alfalfa (Medicago sativa Linn.) on pentachlorophenol (PCP) adsorption by soil and its main chemical components was investigated. The experimental results indicated that the data of PCP adsorption was fitted ...
-
Synthesis of MnFe2O4 and Mn3O4 magnetic nano-composites with enhanced properties for adsorption of Cr(VI): artificial neural network modeling
This study reports adsorptive removal of Cr(VI) by magnetic manganese ferrite and manganese oxide nano-particles (MnF-MO-NPs) composite from aqueous media. The X-ray diffraction pattern of MnF-MO-NPs revealed a polycrystalline nature with nanoscale crystallite size. The prepared adsorbent with high Brunauer–Emmett–Teller specific surface area of 100.62 m2/g and saturation magnetization of ...
-
Identification of the bacterial population in manganese removal filters
The aim of this study was to identify bacteria present in ripened manganese removal filters for drinking water production. The bacterial population was identified with ‘next generation’ DNA sequencing, and specific bacteria were quantified with quantitative polymerase chain reaction (qPCR) and characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry ...
-
Practical evaluation of inorganic contaminant presence in a drinking water distribution system after hydraulic disturbance
The accumulation of loose deposits in a drinking water distribution system (DWDS) is a potential risk for water quality. In this work, hydraulic disturbance was simulated in different areas of a large DWDS. The water quality features before and after the disturbance were compared, and the solid deposits captured from different experimental sites were characterized. The results showed that the ...
-
The on-site feasibility study of iron and manganese removal from groundwater by hollow-fiber microfiltration
The aim of this research was to investigate the removal of iron and manganese from groundwater by aeration, chlorine oxidation and microfiltration (MF). Pilot-scale experiments were performed at the Chang-Hua Water Treatment Plant in Taiwan. The raw waters contained soluble iron (0.4 mg/L) and manganese (0.5 mg/L) which were oxidized by chlorine and then filtered by hollow-fiber PTFE-MF. The ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you