2.2. Batch adsorption measurements. The adsorption of phosphate on synthesized magnetite was examined over pH 2–8 with 10 mg/L initial phosphate concentrations and two different levels of CA (0 and 0.05 M).The dissolved CA was adjusted by addition of C 4 H 6 O 7, and the reactor with 25 mL total solution was …
The mechanism of reduction and dephosphorization of phosphorus-containing magnetite was studied using SiC as reducing agent. The thermodynamic …
This suggests that magnetite has been formed after the modification of the raw bentonite with Fe and Zr. Furthermore, the peak . Conclusions. M-ZrFeBT exhibited a good affinity towards aqueous phosphate at pH 7, with a maximum phosphate monolayer adsorption capacity of up to 8.02 mg P/g.
This sample was prepared via the standard method for magnetite preparation described in Cornell and Schwertmann (1996) and had previously been used in the development of a sequential Fe extraction by Poulton and Canfield (2005). Partial oxidation of magnetite to hematite during subsequent storage was confirmed by XRD (SI Fig. 2).
PDF | High-phosphorus oolitic iron ore, treated by suspended flash magnetic roasting, contained 42.73% iron (mainly present as magnetite) and 0.93%... | Find, read and cite all the research you ...
The phosphorus distribution behavior in iron ore pellets reduced by CO-H2 gas mixtures was investigated. ... temperatures of between 600 and 900°C. 9 The time-dependent phosphorus migration characteristics behavior of medium-phosphorus magnetite ore during carbothermic reduction was investigated. 10 The results showed …
Phosphorus, Magnetite, Ballasted Technology, Operation Experience, Nutrient Removal, ABSTRACT The Town of Billerica is located in Middlesex County, Massachusetts and owns and operates the town's wastewater treatment facility (WWTF). In 2005 a revision of the plant environmental discharge license
Semantic Scholar extracted view of "Magnetite/Lanthanum hydroxide for phosphate sequestration and recovery from lake and the attenuation effects of sediment …
This study investigated the applicability and chemical stability of magnetite mineral microparticles (Mag-MM) (average particle size: 34 μm) for phosphorus (P) removal and recovery from actual secondary effluent (SE) of a sewage treatment plant.The maximum P adsorption capacity of Mag-MM was 0.52–0.83 mg P/g at 5–45 °C.The …
Magnetite nanoparticles of 40 nm in size have been phosphated in orthophosphoric acid. Large phosphatation rates, equivalent to goethite capacity, have been pointed out, and the possibility of …
1. Introduction. Phosphate (P) is an indispensable salt for the growth and survival of all plants and animals. Whereas, the amount of discharged phosphate from the artificial production like fertilizing in agriculture is excessive for the environmental capacity, triggering severe eutrophication, deteriorating water quality, and threatening the health …
Zaporski and Yang (2022) the impacts of magnetite on phosphorus storage and carbon cycling in Lake Michigan shoreline sediments. Microcosm incubations with …
The characteristics and mechanism of phosphate adsorption onto magnetite, hematite and goethite were comparatively studied, and the effects of …
This study developed novel active capping systems with recycling convenience using ferrihydrite (Fh) combined with magnetite (Mag), and investigated the effectiveness and mechanism for the restriction of endogenous phosphorus movement from sediment into overlying water (OW) by the combined use of Fh and Mag.
The low adsorption capacity of magnetite (Fe 3 O 4) for phosphates has a potential negative impact on magnetic composites. ... Phosphorus (P) is an essential element and nutrient for all living organisms, playing a crucial role in maintaining the ecosystem balance. However, an excess of phosphate can lead to detrimental …
Magnetite/zirconium-comodified attapulgite (Fe/ZrATP) acting as a novel phosphorus (P) sorbent was synthesized, characterized and applied to control P in an aquatic environment. Batch experiments demonstrated that at an adsorption dose of 0.2 g, 97.8% of the phosphate was rapidly sequestered from aqueous solution within 24 h, …
Nano-magnetite addition structured an enormous and compact electron transfer network, thus enhanced DIR and vivianite formation. Our study proposed a new strategy to promote iron-reduction-coupled phosphorus recovery with natural DIR products, and provided theoretical support for clarifying the interaction between minerals and microorganisms.
To further study the effect of CMC on the magnetite's phosphate adsorption capacity, 0.01 g cellulase was added into the adsorption systems that contained CMC-NP and CMC-MP, respectively, after reaction for 5 h. At pre-determined times duplicate bottles were saced for analysis, the suspensions were centrifuged at 8 kg-force and filtered ...
Zaporski and Yang (2022) the impacts of magnetite on phosphorus storage and carbon cycling in Lake Michigan shoreline sediments. Microcosm incubations with native sediments demonstrated that "the ...
The phosphorus content of Australian iron ores is a particularly serious problem. There are extensive (~7 billion tonnes) amounts of high phosphorus-containing ore in Western Australia deposits that are close to existing infrastructure. These deposits have acceptable iron grade, but the phosphorus levels (>0.1 wt-% P) incur a price …
Phosphate is one of the main contaminants responsible for the eutrophication of surface waters, and adsorption is a potential treatment method of this pollutant. A magnetic adsorbent manufactured from magnetite (Fe 3 O 4) can be easily recovered from treated water by magnetic force, without requiring further downstream treatment.
Fig. 3, Fig. 4 show that how much phosphate precipitated in total (a) and onto the magnetite surfaces (b) for initial phosphorus concentrations of 0.645 and 1.29. mmol/l.. The data given in these figures represent the results obtained after 1 h of reaction time.The results show that the amount of phosphate precipitated onto magnetite …
Magnetite was greatly effective for phosphorus removal in the column experiments, which is a more practical reflection of phosphorous removal combing the adsorption isotherm model and the ...
The synthesized gel was made magnetite by embedding Fe 3 O 4 nanoparticles through co-precipitation To date, development of adsorbents for nitrate and phosphate removal by using the combination of these materials has not been reported. The synergistic effect of combining chitosan, polyaniline and magnetite nanoparticles is …
1. Introduction. Phosphorous (P) is an essential nutrient element in all forms of living organisms. It engages with the origin and evolution of life as the component of nucleic acids (DNA and RNA) and ATP/ADP energy source in living cells (Nancharaiah et al., 2016).The natural P cycle has been established since the earth was born, involving …
Precipitation of calcium phosphates from supersaturated solutions seeded with magnetite powder (magnetite mineral, Fe 3 O 4) has been studied in lab scale in the pH range 6.9–7.7.While the initial concentration of phosphorus was 1.29. mmol/l, the initial molar ratio of Ca/P was taken one to three times of the stoichiometric calcium to …
magnetite ore ranges from 515 to 550 kg mm-2, with an average of 528 kg mm-2. While its density is in the range of 5.16 to 5.18 g cm-3. The magnetite ore has strong magnetic, brittle, odorless and tasteless. Magnetite is broadly distributed in nature, and it could remove low concentrations phosphorus from wastewater by adsorption.
High-phosphorus oolitic iron ore, treated by suspended flash magnetic roasting, contained 42.73% iron (mainly present as magnetite) and 0.93% phosphorus (present as collophane). Low-intensity magnetic separation (LIMS) was combined with reverse flotation to increase the iron and reduce the phosphorus contents of the …
Contamination of groundwater by arsenic (As(III/V)) is a serious global issue, and phosphate (P(V)) is known to be the biggest interference in adsorption-based remediation methods. The present study is focused on understanding the interaction between phosphate and iron oxides/oxy-hydroxides with two well-known classes of potential …
Ferrihydrite was superior to that of magnetite in improving phosphorus and COD capture performance of bioflocculation technology. TCOD and TP removal efficiency could respectively reach 78.5% and 91.2%, by ferrihydrite assisted bioflocculation process. Magnetite would induce a high biotoxicity and result in poor effluent quality.
As the most widely distributed magnetic natural mineral on Earth, magnetite (radius 1.0 to 2.0 mm), with a magnetization value of 50 emu/g, was used as EMF carrier in this study. The quartz sand with the same size as magnetite was inert, and the sulfur was obtained from a chemical plant (Hebei, China), with a purity above 99 %.
