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Chromium - DOAJ

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Last Updated: 17 September 2022

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Use of Green Chemistry for Amputation of Chromium Ions from Wastewater by Alkali-Treated Composts of Fruit Peels in Economical Way

The chosen sorbent materials for Cr was tested for adsorption by tuning different parameters. Base-treated adsorbents were found to be more adsorbents than the acid treated version, which in turn are better than raw adsorbents. Overall, the chosen sorbents removed Cr in the range of 53. 62 to u201396%, though the maximum sorption is with base-treated water melon peels, which is 95. 98 percent. Both thermodynamic and chemical testing results confirm that under ideal conditions, all of the selected sorbents specifically base-treated sorbents are adequate for the removal of Cr ions in an eco-friendly manner.

Source link: https://doi.org/10.1155/2022/9924164


Chromium Removal from Electroplating Wastewater Using Activated Coffee Husk Carbon

Chromium is a heavy metal with a significant environmental health issue. Various studies have been published in Ethiopia on the removal of Cr from various forms of wastewater; however, factual studies on the adaptability of cost-effective activated coffee husk carbon for the removal of Cr from electroplating wastewater are lacking. This research was therefore conducted in an attempt to determine the Cr adsorption efficiency of activated coffee husk carbon from electroplating wastewater at laboratory scale. The ability of activated coffee husk carbon to desorb Cr was tested. The activated coffee husk carbon had good quality, and, therefore, playing a vital role in metal adsorption, according to a characterization of the adsorbent's physicochemical properties. In general, due to the ease with which coffee husk can be obtained from coffee processing plants, its use as an absorbent will be cost-effective and considered as an alternative to removing Cr metal from wastewaters.

Source link: https://doi.org/10.1155/2022/7646593


On retrieving the chromium and zinc concentrations in the arable soil by the hyperspectral reflectance based on the deep forest

However, such a spectral reflectance is generally affected by various heavy metal components, posing a significant challenge to ensure the inversion accuracy for a specified heavy metal percentage. The Deep Forest 2021 algorithm, which provides a novel approach for hyperspectral inversion with high precision, shows promising results in the deep learning. This paper uses Chromium and Zinc concentrations as examples, and it investigates the DF21 for retrieving heavy metal content by the spectral representation of the naturally contaminated arable soil. The results show that the spectral pretreatment may have a positive effect on the inversion results, but that it has no or even negative impact on the inversion results after the PCA is applied. The Cr concentration, which has a relatively low degree of heterogeneity, has higher inversion accuracy, meaning that spatial heterogeneity could have a direct influence on the ORI-PCA-DF21's results.

Source link: https://doi.org/10.1016/j.ecolind.2022.109440


Evaluation of Phenotypic Responses of Selected Rice (Oryza sativa L.) Cultivars to Hexavalent Chromium Stress in Soil

The study of tolerance and phenotypical changes of three specially selected rice cultivars, Bina Dhan 11, Kalachachampa, and Pratikshya, in the seedling stages, was done under soil Cr concentrations up to 300 mg. kg-1 of soil. p u2264 0. 05 The 7-day seedlings of these rice cultivars were found to show a significant decrease in shoot and root growth in these rice cultivars growing on Cr treated soils, which was found to have a significant decrease in shoot and root growth at 7 p. 0. 05. p 2264 0. 05 Bina Dhan 11's 7-day seedlings were found to be the best among the three cultivars under soil Cr stress conditions, according to the experimental findings.

Source link: https://doi.org/10.46488/NEPT.2022.v21i03.041


Microbial-assisted soil chromium immobilization through zinc and iron-enriched rice husk biochar

The tannery effluent compromises the atmosphere and poses serious health issues, with Soil chromium toxicity often resulting from the tannery effluent compromises the soil and poses significant health risks. This research, therefore, examined the benefits of zinc and iron-enriched rice husk biochar with microbial combinations to promote chromium immobilization in sandy loam soil. After 40 days of incubation relative to wastewater, the soil DTPA-extractable chromium was down by 96 percent. Langmuir's adsorption isotherm reported the highest chromium adsorption capacity with FeBC 3% at 40 DAI. Overall, the study found that microbes + ZnBC/FeBC contributed to low pH, high OM, and CEC, which ultimately played a role in maximum Cr adsorption from wastewater applied to the soil. The correlation and shifts in soil dynamics with pollution control techniques were also shown in the paper. To reduce the Cr toxicity, FeBC with Trichoderma viride should be tested on the field scale.

Source link: https://doi.org/10.3389/fmicb.2022.990329


In situ microscopic investigation of ion migration on the surface of chromium coated steels

On the micro- and macroscale, the electrolyte diffusion of electrolyte on two-layers chromium coatings electrodeposited on steel was investigated. The kinetics of spreading observed at microscopic scales are similar to that measured using a scanning Kelvin probe on larger scales, in average. Microscopy of surface defects and surface microscopy is shown as a cost-effective in situ method to detect electrolyte spreading and microscopic skin microscopy.

Source link: https://doi.org/10.1038/s41529-022-00285-7


Removal of Chromium (VI) from the Steel Mill Effluents Using the Chemically Modified Leaves of Pteris vittata as Adsorbent

Chromium, a metal that is widely used in industrial and water bodies, is not only the primary causative agent of lung cancer in humans but also negatively impacts plant metabolism. The present study was designed to remove Cr from industrial effluents of steel mills installed in Dargai District Malakand, Pakistan, using chemically modified Pteris vittata plant leaves as an adsorbent. With maximum uptake capacity q max estimated from the Langmuir isotherm, the best elimination of Cr was recorded at pH = 2 with maximum uptake capacity q max as calculated from the Langmuir isotherm. The modified leaves-based biosorbent can be used as an alternative adsorbent for effective Cr removal from water, and its use could be extended to other heavy metals and organic pollutants as well, and further research is required in this regard.

Source link: https://doi.org/10.3390/w14172599

* 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