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Chromium - Springer Nature

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Last Updated: 17 September 2022

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Wear Behavior of High Chromium Cast Iron and Heat Treated AISI P20 Steel Under Round and Sharp Counterbodies

Within a week, a hammer made from High Chromium Cast Iron suffered a significant material loss during barite rock crushing. HCCI microstructure consists of martensite and eutectic carbide, based on microscopy results, although AISI P20 indicates a total martensite microstructure. AISI P20T is characterized by a robust wear resistance in contrast to HCCI results, which showed poor wear endurance.

Source link: https://doi.org/10.1007/978-3-031-14615-2_79


Chromium(VI) adsorption onto boehmite nanoparticles obtained by cost effective “green” synthesis

By a simple route, memesopowder was delivered and used as an effective adsorbent for chromium removal. Chromium is known to be a human carcinogen, so removal of Cr ions from a aqueous solution is of utmost importance. Batch adsorption experiments were carried out to investigate the effects of contact time and Cr's initial concentration. The boehmite was prepared by neutralization of sodium aluminate solution from Bayer liquor and glucose as a nonionic surfactant, and it is a nonionic surfactant suitable for future industrial scale production.

Source link: https://doi.org/10.1007/s13762-021-03819-9


An investigation of the work function and stability of chromium oxide thin films deposited by reactive magnetron sputtering

The deposition conditions used during the sputtering process are vital in determining the deposited films' characteristics and allowing the production of thin film coatings that are suitable for specific engineering applications. The film prepared at a deposition power of 300 W and at a 10-sccm oxygen flow rate of 10 sccm had higher film passivation and breakdown capabilities, thus improved corrosion resistance in comparison to films prepared at higher deposition rates, according to the OCP and cyclic polarization results. The results are bolstered by the Mottu2013Schottky and work function studies, where the same film also had lower defect density and higher work function values as compared to those that were deposited at higher resolutions.

Source link: https://doi.org/10.1007/s10800-022-01718-6


Use of microorganisms and agro-industrial wastes in the biosorption of chromium (VI): a review

Chromium ions in wastewater build up over time, reaching concentrations that are detrimental to both the climate and human health due to their non-biodegradable nature. Extensive research has been carried out to find new methods for the removal of Cr from industrial effluents. Finally, representative models have been created for the reduction of Cr to Cr's by-products. Based on these factors, we conclude that a method based on the interaction and synergy between microorganisms and agro-industrial waste materials may be a cost-effective way to improve the effectiveness of removal and reduction of Cr to Cr.

Source link: https://doi.org/10.1007/s12649-022-01755-4


Sediment geochemistry and its influence on chromium enrichment in porewater from a deep aquifer in the Baiyangdian Basin, China

However, which Cr forms and species of aquifer solids influence Cr mobility in the sedimentary aquifer is unclear. We hypothesize that Cr species, Cr oxidation capability, and the possibility of Cr release of Cr in aquifer sediments control dissolved Cr in aquifer systems. In shallow aquifer systems with high Cr groundwater, the ratio of adsorbed Cr in sediments to dissolved Cr in depth-matched porewater was clearly higher in shallow aquifer systems than in deep aquifer systems with high Cr content. Several strong positive correlations were discovered between dissolved Cr in porewater and the possibility of trivalent chromium [Cr] oxidation or leakage of Cr in sediments, indicating that Cr oxidation and Cr release were conducive to the enrichment of dissolved Cr in porewater. Concentrations of dissolved Cr in porewater were positively related to adsorbed Cr, Cr's oxidation ability, and the possibility of original Cr in aquifer sediments.

Source link: https://doi.org/10.1007/s11368-022-03259-z


Green MoS_2 nanosheets as a promising material for decontamination of hexavalent chromium, pharmaceuticals, and microbial pathogen disinfection: spectroscopic study

Due to the damaging effects on human health, photoreduction of chromium hexavalent ions from the aquatic environment is urgently needed. Herein, we present a simple, template-free hydrothermal scheme to produce green and homogeneous molybdenum disulfide nanosheets for the fast removal of Cr6+ ions and pharmaceuticals from wastewater. The estimated crystallite size of the MoS_2 nanosheets is determined to be 1. 7 nm, according to the investigators' investigation into the nanostructure and morphology of the finished MoS_2 nanosheets. The MoS_2 achieved significant decrease results for Cr6+ under simulated sunlight, 90 min at pH, and 40 percent at pH 0. 6; the MoS_2's reduction rate for Cr6+ is 100% under simulated sunlight, 90 min at pH ; The results reveal that the MoS_2 produced remarkable reduction results for Cr6+; the MoS_2 demonstrated outstanding reduction results for Cr6+; The importance of the adsorption step in Cr6+ ions photoreduction has been reiterated by a new spectroscopic study report. Interestingly, complete removals of E. coli O157:H7, Listeria monocytogenes, and Candida albicans were detected at a dose of MoS_2 nanosheets of 250 ppm after a contact time of 30, and 45 minutes, respectively.

Source link: https://doi.org/10.1007/s11051-022-05573-6


Chromium doped ZnO nanoparticles for energy storage, gas and humidity sensing and spin based electronic devices applications

In all doped samples, we can be summarized as following; XRD results revealed the presence of wurtzite crystal structure with secondary phase formation in all of the above tools; as a key result of all of the above mentioned above equipment, we can be summarized as follows; XRD results confirmed the presence of wurtzite crystal structure with secondary phase formation. Also, it was discovered that as Cr ions were increasing the particle size in the samples that didped with Cr ions content of, while at 0. 14 Cr content, there was a modest rise was observed. chromium ions were discovered in ZnO nanoparticles' structure, according to FTIR spectroscopy spectra. With increasing Cr content, the energy band gab was found to have increased from 3. 84 to 4. 02 eV. The ac conductivity for Cr doping samples exhibited increasing values, especially the sample of 0. 14 wt% Cr concentration. In addition, the Cr doped ZnO nanoparticles demonstrated a ferromagnetic behavior at room temperature.

Source link: https://doi.org/10.1007/s11082-022-04075-y


Peanut Shell-Derived Biochar as a Low-Cost Adsorbent to Extract Cadmium, Chromium, Lead, Copper, and Zinc (Heavy Metals) from Wastewater: Circular Economy Approach

The buildup of heavy metals in water bodies degrades the water quality and availability of water bodies. The manufacturing of adsorbents from industrial waste produces large amounts of harmful chemicals, such as greenhouse gases, and it is also costly to produce; therefore, it has been suggested that adsorbents be grown using biomass, which promotes both circular economy and sustainability. Even without pyrolysis, peanut shells were used to remove heavy metals from shells, according to researchers. Lead and peanut shells were extracted from lead and shells in one study, but 74. 36%, 74. 5 percent, and 74. 4 percent of lead was extracted, respectively. In this article, more literature on the use of peanut shells to extract heavy metals in wastewater is reviewed to further demonstrate that peanut shells can be used as an adsorbent.

Source link: https://doi.org/10.1007/s43615-022-00207-4

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions