No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
No. 1688, Gaoke East Road, Pudong new district, Shanghai, China.
However, the concentration of formaldehyde indoor is usually lower than 50 ppm, and the catalytic removal at room temperature is more acceptable. ... Nanostructured manganese oxides as highly active water oxidation catalysts: a boost from manganese precursor chemistry. ChemSusChem, 7 (2014), pp. 2202-2211. Crossref View in Scopus Google Scholar
Nitrate-dependent manganese oxidation (NDMO) bacteria were enriched in the reactor. ... soluble divalent manganese solution were daily pulse-dose into the reactor to maintain the bulk nitrate and divalent manganese concentration for NDMO microorganisms enrichment in the ranges of 0–100 mg N L −1 and 0–100 mg Mn 2+ L −1 (Phase I). With ...
Many different organisms oxidize manganese ('Ehrlich, 1981; Nealson, 1983b; Ghiorse, 1984b), including bacteria, algae, yeast, and fungi, and the mechanisms by which …
Manganese (Mn) is one of the most abundant metals in Earth's crust. Mn can exist in 11 oxidative states, but the most widely occurring forms in the environment are soluble Mn(II) when reduced and insoluble Mn(III/IV) when oxidized (Tebo et al., 2004).Naturally occurring Mn(II) is commonly found in drinking water sources and is essential for human health at low …
Biological oxidation of manganese results in hydrated forms of y-MnOOH manganese oxides, while chemical oxidation creates more amorphous forms of manganese …
First, the Mn (II) concentration utilized must not inhibit biological activity. Second, effective abiotic controls must be employed to distinguish biological Mn (II) removal and/or …
The abundance and oxidation states (II, III and IV) of manganese (Mn) in a weathering profile encompassing both the soil layers (A and B horizons) and the underlaid …
Nickel (Ni) critically affected both manganese (Mn) oxidation and pellicle biofilm formation in Pseudomonas putida GB-1 at considerably lower concentrations than bacterial growth. The inhibition of Mn oxidation was correlated with the underexpression of two key genes involved in oxidase enzyme production, and the production of Mn oxides was directly related …
To further evaluate the role of SO 2 and Mn 2+, chamber experiments were carried out with different concentrations of Mn 2+ and SO 2 under similar relative humidity (RH) and NH 3 conditions. As ...
All these MMO processes require substantial free oxygen concentrations. Even the new group of manganese oxidizers reported by Yu et al., which accomplish Mn (II) oxidation …
the formation of manganese oxides on the cell surface under various conditions of pH and cell density. Growth rates of S. subspicatus were determined over a range of Mn concentrations to evaluate essential and toxic Mn concentration ranges. Final-ly, we compared the response of the algal cultures to the manganese concentrations
Manganese is an important component of some marine reduction-oxidation cycles. It is usually assumed that only the Mn(II) and Mn(IV) oxidation states play an important role in these cycles. But recently, Webb et al. (1) suggested that during the oxidation of Mn(II) by bacteria, Mn(III) is formed as an intermediate. Large concentrations of Mn(III) would then …
Anaerobic microbial manganese oxidation (AMMO) has been considered an ancient biological metabolism for Mn element cycling on Archaean Earth before the presence of oxygen. ... The concentrations ...
Manganese (Mn), as a cofactor of multiple enzymes, exhibits great significance to the human body, plants and animals. ... To determine the effect of cell concentration on the rate of Mn oxidation, a series of Mn oxidation experiments on Leptothrix discophora strain SS-1 were conducted at four different cell concentrations ranging from 24 to 35 ...
Iron (Fe) and manganese (Mn) are present in very low concentrations in groundwater but when found in high concentrations can affect the aesthetics of the water. The World Health Organization (WHO) has not established specific health-based guidelines for iron.
The principal controls on manganese concentration in groundwater are pH (acidity) and redox (oxidation-reduction) condition. Manganese is mobilised under acidic conditions. Hence concentrations can be relatively high in acidic waters such as some industrial waters and those issuing from mines rich in weathered sulphide minerals
Electrocatalytic studies for water oxidation. The electrocatalytic OER performance of the manganese phosphates were explored by cyclic voltammetry (CV) in a 0.05 M pH = 6.99 PBS solution on a ...
On the other hand, high concentrations of Mn can be toxic to microbes. Therefore, microbes need to evolve not only the ability to utilize Mn for their own growth and metabolism but also mechanisms to protect themselves from its potential harm. ... In 'direct manganese oxidation' process, manganese is oxidized by manganese oxidase enzymes ...
The mechanisms of Mn in metabolic diseases via oxidative stress. (a) Mn deficiency will cause a number of detrimental effects, such as impaired growth, poor bone formation and skeletal defects, reduced fertility and birth defects, abnormal glucose tolerance, and altered lipid and carbohydrate metabolism in both animals and humans.
9 form (ATSDR, 2012). Manganese can exist in 11 oxidation states; the most environmentally and 10 biologically important manganese compounds are those that contain Mn2+, Mn4+ or Mn7+. Manganese can ... 95 concentration of manganese in ambient air from 2009-2013 reported as 1.25×10-3 µg/m3 (range from below
However, the oxidation of NH þ 4 and NO 2 À through nitrification is energetically more favorable than Mn oxidation, so that manganese removal through SAR will take place only after ammonium is ...
Manganese oxidation and reduction in soils: effects of temperature, water potential, pH and their interactions ... concentrations can fluctuate widely and rapidly with changes in
oxidation and to stabilize organic molecules, at least temporarily, through organo-mineral associations. ... concentrations and further influence global climate. Indeed, approximately ∼14% of anthropogenic CO 2 released to the ... Manganese is a highly reactive soil constituent that is known
Abstract. Manganese (Mn 2+) oxidation is an important phenomena in environmental and industrial processes.This study aims to shed light on the mechanism by which NaClO oxidizes Mn 2+ to precipitate MnO 2 in the presence of HCl. Experiments at pH = 1.5 indicated that the autocatalytic formation and the BET surface area of the MnO 2 precipitates …
MnO x is the most powerful natural oxidant in pathway I, with typical redox potentials of 1.23 V [13] and 1.51 V [14], respectively (Equations (1) and (2)).
The model reproduces this by means of a threshold on particulate manganese oxides of 25 pM, suggesting that a minimal concentration of particulate Mn is needed before aggregation and removal ...
Manganese comprises about 0.1% of the total mass of the Earth (Nealson 1983) and occurs as MnAl 2 O 4 (Zajic 1969).It is the fifth most abundant transition metal in the Earth's crust (Tebo et al. 2007) and is the second most common trace metal after iron (Tebo et al. 1997).The name manganese is derived from the Greek word mangania, meaning magic …
2 concentrations below 3 µM, both oxidation and reduction processes can occur but usually at different depths. In suboxic zones, dissolved Mn is ... sections 2.5, 4 and 5). In this overview, we look at the cycling between these three oxidation states of manganese and show that dissolved [Mn(III)] is an important part of manganese cycling
In this review, we focus on the Mn (II) oxidation process mediated by different MnOM, including their Mn (II) oxidation characterization and putative mechanism, as well as characterization of BioMnOx, and BioMnOx-related environmental remediation processes.
Here we show that communities of anoxygenic photosynthetic microorganisms biomineralize manganese oxides in the absence of molecular oxygen and high-potential …
