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Journal articles on the topic 'Chromium (VI) oxide powder'

Author: Grafiati
Published: 2 June 2025
Last updated: 31 July 2025

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1

van Leeuwen, Travis Kent, Ryan Dowdy, Amberly Guerrero, and Paul Gannon. "Reactive Condensation of Cr Vapor on Aluminosilicates Containing Alkaline Oxides." ECS Transactions 112, no. 5 (2023): 29–40. http://dx.doi.org/10.1149/11205.0029ecst.

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This research aims to improve fundamental understanding of the reactive condensation of Chromium (Cr) vapors, which are generated in many high-temperature (>500℃) process environments and can form potentially problematic condensed hexavalent (Cr(VI)) species downstream. . This study focuses on the effects of alkaline oxide additives in aluminosilicate fibers on Cr condensation and speciation. Cr vapors were generated by flowing humid, high-temperature air over chromia (Cr2O3) powder, with aluminosilicate fiber samples positioned downstream. Results indicate presence of hexavalent chromium (
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2

Liu, Minghui, Zhiwen Tan, Yuantao Zhao, et al. "Optimization of Spray Parameters and Corrosion Properties of Plasma-Sprayed Cr2O3 Coatings Using Response Surface Methodology." Crystals 15, no. 4 (2025): 377. https://doi.org/10.3390/cryst15040377.

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In this study, the experimental design of response surface methodology was used to explore the interaction between spraying parameters to obtain an optimized process to reduce the porosity of the coating, and to prepare an excellent chromium oxide coating. The order of the single parameter affecting porosity is as follows: power > main gas > spraying distance > carrier gas flow. This study found that the spraying process with the lowest porosity of the chromium oxide coating is as follows: power of 625 W, stand-off distance of 105 mm, primary gas of 42.5 lpm, carrier gas flow of 5 lpm
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3

Khan, Saif Ullah, Rumman Zaidi, Saeikh Z. Hassan, I. H. Farooqi, and Ameer Azam. "Application of Fe-Cu binary oxide nanoparticles for the removal of hexavalent chromium from aqueous solution." Water Science and Technology 74, no. 1 (2016): 165–75. http://dx.doi.org/10.2166/wst.2016.172.

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The adsorption process has been used as an effective technique for the removal of metal ions from aqueous solutions. Groundwater remediation by nanoparticles has received interest in recent years. In the present study, a binary metal oxide of Fe-Cu was prepared and used for the removal of hexavalent chromium from aqueous solution. Batch experiments were performed to investigate the effects of initial Cr (VI) concentration, dose of adsorbent, and pH of solution on the removal efficiency of Cr (VI). The prepared nanostructured Fe-Cu binary oxides were able to reduce the concentration of Cr (VI)
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4

Muska, M., A. Naeem, M. Hamayun, et al. "Comparative sorption studies of chromate by nano-and-micro sized Fe2O3 particles." Open Chemistry 15, no. 1 (2017): 147–55. http://dx.doi.org/10.1515/chem-2017-0016.

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AbstractThe comparative adsorption studies of Cr (VI) on nano and micro-powder Fe2O3 were investigated using kinetics and batch adsorption techniques. The uptake of chromate onto both the oxides of iron was observed to be dependent on the pH, contact time, temperature, media dosage and concentration of chromate anions. The values of sorption maxima were higher in the case of Fe2O3 nanopowder than the micro-powder which can be ascribed to the high surface area and point of zero charge (PZC) of the former oxide. The Dubinin-Radushkivech and Langmuir models were found well fitted for the descript
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5

Bisht, Gunjan, Sanjila Neupane, and Rebika Makaju. "Supercritical CO2Assisted Synthesis of EDTA-Fe3O4Nanocomposite with High Adsorption Capacity for Hexavalent Chromium." Journal of Nanomaterials 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/2192647.

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Efficiency of EDTA functionalized nanoparticles in adsorption of chromium (VI) from water was investigated in this study. Magnetic iron oxide nanoparticles (IONPs) were synthesized by a simple chemical coprecipitation route and EDTA coating onto IONPs was attained via supercritical carbon dioxide (Sc CO2), a technology with green sustainable properties. The obtained nanoparticles were then characterized by UV-Visible spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and vibra
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6

van Leeuwen, Travis Kent, Ryan Dowdy, Amberly Guerrero, and Paul Gannon. "The Influence of Water Concentration on High-Temperature Reactive Evaporation and Condensation of Cr in 800°C Air." ECS Transactions 111, no. 6 (2023): 263–71. http://dx.doi.org/10.1149/11106.0263ecst.

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Reactive evaporation of Cr from stainless steels used in solid oxide electrochemical systems, such as solid oxide fuel cell (SOFC) and solid oxide electrolysis cell (SOEC) systems, is well-documented as the cause of Cr poisoning; however, the condensation and interactions of volatilized Cr species onto and with surrounding interfaces during complex and dynamic system exposures is less understood. Understanding these interactions during operation is critical for improving system performance and safeguarding environmental, health and safety, as some condensed Cr forms toxic hexavalent chromium (
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7

Jibin, Keloth Paduvilan, Silpa Augustine, Prajitha Velayudhan, et al. "Unleashing the Power of Graphene-Based Nanomaterials for Chromium(VI) Ion Elimination from Water." Crystals 13, no. 7 (2023): 1047. http://dx.doi.org/10.3390/cryst13071047.

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Graphene-oxide-based nanomaterials have gained attention in recent years in the field of heavy metal removal. In this work, graphene oxide (GO) and graphene-oxide-coated silica nanoparticles (GO/SiO2) were synthesized for the efficient removal of Cr(VI) ions from water. Synthesized nanosorbents were characterized by FTIR, Raman spectroscopy, and Transmission Electron Microscopy (TEM). The effects of the pH and the concentration of Cr(VI) ions in adsorption, using GO and GO/SiO2, was studied using the batch process. The results of the study indicated that the maximum removal percentage was show
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8

Ai, Tian, Xiaojun Jiang, and Qingyu Liu. "Chromium removal from industrial wastewater using Phyllostachys pubescens biomass loaded Cu-S nanospheres." Open Chemistry 16, no. 1 (2018): 842–52. http://dx.doi.org/10.1515/chem-2018-0073.

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AbstractIn this paper, a new surface modification method was reported for the preparation of Phyllostachys pubescens powder as an effective adsorbent for the removal of chromium. Complex copper sulfide (Cu-S)nanospheres were evenly dispersed and loaded into the internal surface of the adsorbent, which provided both the ion exchange and oxidative-reductive properties. The composite showed an excellent adsorption efficacy for Cr(III) and Cr(VI). The surface properties of the obtained materials were characterized by FTIR and SEM. Maximum adsorption for Cr(III) and Cr(VI) was observed at pH 6.1 an
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9

Branton, Alice, Mahendra Kumar Trivedi, Dahryn Trivedi, Gopal Nayak, and Snehasis Jana. "Assessment of the Effect of Consciousness Energy Healing Treatment on Physicochemical and Thermal Properties of Chromium (VI) Oxide." Journal of Nanotechnology and Materials Science 5, no. 1 (2018): 68–74. https://doi.org/10.15436/2377-1372.18.2024.

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Chromium TriOxide (CrO3) is an inorganic compound which has many industrial applications, but it is very hygroscopic, toxic and a powerful oxidizer. The objective of this study was to evaluate the impact of the Trivedi Effect® (Consciousness Energy Healing Treatment) on the physicochemical and thermal properties of CrO3 using modern analytical techniques. The CrO3 test sample was separated into two parts. One part of the test sample was called as a control sample (no Biofield Energy Treatment was provided), while the second part of chromium trioxide sample received the Consciousness Energy
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10

Mishra, Shuddhodan P., and Shri Niwash Singh. "Radiotracer technique in adsorption study—part VI. Adsorption of chromate ions on chromium(IV) oxide powder." International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes 38, no. 7 (1987): 541–48. http://dx.doi.org/10.1016/0883-2889(87)90202-4.

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11

van Leeuwen, Travis Kent, Ryan Dowdy, Amberly Guerrero, and Paul Gannon. "Reactive Condensation of Cr Vapor on Aluminosilicates Containing Alkaline Oxides." ECS Meeting Abstracts MA2023-02, no. 45 (2023): 2207. http://dx.doi.org/10.1149/ma2023-02452207mtgabs.

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The research presented herein is part of a larger project delving into the mechanisms and pathways for reactive condensation of Chromium (Cr) vapors in high-temperature (>500o C) environments. The overall goal of this research project is to improve fundamental understanding of reactive condensation pathways for chromium (Cr) vapors generated in high-temperature systems such as exhaust manifolds, steam turbines, boilers, or solid oxide fuel cells (SOFCs). Reactive evaporation of Cr from stainless steels commonly used in these systems is well-documented; however, the interactions between vola
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12

Thabede, Patience Mapule, Ntaote David Shooto, Thokozani Xaba, and Eliazer Bobby Naidoo. "Magnetite Functionalized Nigella Sativa Seeds for the Uptake of Chromium(VI) and Lead(II) Ions from Synthetic Wastewater." Adsorption Science & Technology 2021 (January 11, 2021): 1–15. http://dx.doi.org/10.1155/2021/6655227.

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The aim of the present study was to utilise pristine and magnetite-sucrose functionalized Nigella Sativa seeds as the adsorbents for the uptake of chromium(VI) and lead(II) ions from synthetic wastewater. Prestine Nigella Sativa seeds were labelled (PNS) and magnetite-sucrose functionalized Nigella Sativa seeds (FNS). The PNS and FNS composites were characterized by Fourier-transform infrared spectroscopy (FTIR) and X-ray powder diffraction (XRD). The FTIR analysis of both adsorbents revealed the presence of vibrations assigned to 1749 and 1739 cm-1 (-C=O) for ketonic group for both adsorbents
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van Leeuwen, Travis Kent, Ryan Dowdy, Amberly Guerrero, and Paul Gannon. "The Influence of Water Concentration on High-Temperature Reactive Evaporation and Condensation of Cr in 800°C Air." ECS Meeting Abstracts MA2023-01, no. 54 (2023): 39. http://dx.doi.org/10.1149/ma2023-015439mtgabs.

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Deleterious reactive evaporation of chromium from stainless steels commonly used in solid oxide electrochemical systems is well-documented; however, interactions between Cr vapor species and surrounding interfaces during complex and dynamic system exposures is poorly understood. Understanding the interactions between Cr vapor species and downstream components during operation is critical for improving system performance and safeguarding environmental, health and safety, as many condensed Cr compounds contain toxic and carcinogenic hexavalent chromium Cr(VI). Furthermore, the interactions betwe
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14

van Leeuwen, Travis Kent, Amberly Guerrero, Ryan Dowdy, et al. "(Digital Presentation) Reactive Evaporation of Cr Vapors from Chromia-Alkaline Oxide Mixtures Generated in 800℃ Air and Subsequent Condensation Onto Aluminosilicate Fibers." ECS Meeting Abstracts MA2024-01, no. 19 (2024): 3039. http://dx.doi.org/10.1149/ma2024-01193039mtgabs.

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This research aims to improve fundamental understanding of the reactive evaporation and condensation of Chromium (Cr) vapors, which are generated from Cr containing alloys used in many high-temperature (>500℃) process environments and can form potentially problematic condensed hexavalent (Cr(VI)) species downstream. This study focuses on the effects of alkaline oxides present in the Cr source on the resultant Cr evaporation and condensation. Vapor species were generated by flowing high-temperature (800℃) air containing 3% water vapor over chromia (Cr2O3) and mixtures of chromia with calcium
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15

Niu, Huan, Can Wang, Xia Luo, et al. "Cr(VI) reduction, electricity production, and microbial resistance variation in paddy soil under microbial fuel cell operation." SOIL 11, no. 1 (2025): 323–38. https://doi.org/10.5194/soil-11-323-2025.

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Abstract. The microbial fuel cell (MFC) is an efficient in situ approach to combat pollutants and generate electricity. This study constructed a soil MFC (SMFC) to reduce Cr(VI) in paddy soil and to investigate its influence on microbial community and microbial resistance characteristics. Ferroferric oxide (Fe3O4) nanoparticles, as the cathodic catalyst, effectively boosted power generation (0.97 V, 102.00 mW m−2), with the porous structure and reducibility also contributing to chromium (Cr) reduction and immobilization. After 30 d, 93.67 % of Cr(VI) was eliminated. The bioavailable Cr decreas
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16

Priyadarsini, Amrita, Chirasmayee Mohanty, Spandan Nanda, et al. "Synergistic cobalt oxide/reduced graphene oxide/biochar nano-composite catalyst: harnessing the power of the catalyst for sustainable remediation of organic dyes and chromium(vi)." RSC Advances 14, no. 14 (2024): 10089–103. http://dx.doi.org/10.1039/d4ra01031k.

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17

Faizan, Muhammad, Mariyam Fatima, Faryal Shams, et al. "Plant Extract Mediated Biogenic Synthesis and Characterization of Nickel Oxide Nanoparticles and its Environmental and Antibacterial Applications." Journal of Chemistry and Environment 2, no. 2 (2023): 109–21. http://dx.doi.org/10.56946/jce.v2i2.280.

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This research focuses on the green synthesis of Nickel Oxide nanoparticles (NiO NPs) using Musa paradisiaca, commonly known as banana plant, as a cost-effective and eco-friendly approach. Musa paradisiaca, utilized in traditional medicine, possesses various medicinal properties, including antioxidant, antibiotic, allogeneic, and hypoglycemic antimicrobial attributes. The peduncle extract of Musa paradisiaca serves as a reducing and capping agent for NiO nanoparticle synthesis. Characterization techniques such as XRD, EDX, and UV-vis spectroscopy were employed to analyze the properties of the s
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18

Shahgaldi, Samaneh, and Aditya Singh. "Development of Novel Coating on Metallic Bipolar Plates for Proton Exchange Membrane Water Electrolyzer Application." ECS Meeting Abstracts MA2023-02, no. 49 (2023): 3365. http://dx.doi.org/10.1149/ma2023-02493365mtgabs.

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Considering the demand for a more environmentally friendly system, renewable and sustainable energy sources, such as wind and solar power are regarded as a promising substitute for fossil fuels in the generation of electricity. Since these energy sources exhibit intermittency and unpredictability, there is a need to develop a highly efficient and rapidly responsive energy conversion system for the purpose of storing this energy as a chemical fuel. Due to their ability to manage the variability of intermittent energy sources, proton exchange membrane electrolyzer cells (PEMECs) are garnering co
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19

Young, Jay A. "Chromium(VI) Oxide, CrO3." Journal of Chemical Education 80, no. 3 (2003): 259. http://dx.doi.org/10.1021/ed080p259.

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20

Atmasari, Kica, Sri Anggarini Rasyid, and Erwin Azizi Jayadipraja. "Effectiveness of Pokea (Batissa violaceae celebensis Martens, 1897) shells in reducing hexavalent chromium." Waluya The International Science of Health Journal 3, no. 1 (2024): 1–6. http://dx.doi.org/10.54883/wish.v3i1.623.

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Introduction: Preliminary data obtained showed that the Hexavalent Chromium (VI) content found in the Lasolo River had a concentration of 0.3 mg/l which exceeded the quality standard. Pokea shellfish (Batissa violaceae celebensis Martens, 1897) is an adsorbent used to reduce hexavalent chromium levels in water.
 Method: The methodology used is experimental with a quantitative approach. This study used variations in adsorbent mass and contact time, with variations in adsorbent mass of 2.5 with variations in contact time for 30 minutes, 60 minutes, and 120 minutes.
 Result: Adsorption
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21

Annuar, N. H. R., A. A. Jalil, S. Triwahyono, N. A. A. Fatah, L. P. Teh, and C. R. Mamat. "Cumene cracking over chromium oxide zirconia: Effect of chromium(VI) oxide precursors." Applied Catalysis A: General 475 (April 2014): 487–96. http://dx.doi.org/10.1016/j.apcata.2014.02.005.

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22

Petrucci, Francesco, and Oreste Senofonte. "Determination of Cr(vi) in cosmetic products using ion chromatography with dynamic reaction cell-inductively coupled plasma-mass spectrometry (DRC-ICP-MS)." Analytical Methods 7, no. 12 (2015): 5269–74. http://dx.doi.org/10.1039/c4ay03042g.

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23

Kondagorla, Shivshankar R., and Swapnil V. Madhamshettiwar. "Adsorption of Chromium (VI) from Wastewater Using Blended Natural Adsorbent." Oriental Journal Of Chemistry 40, no. 4 (2024): 1134–37. http://dx.doi.org/10.13005/ojc/400427.

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In this study adsorption of chromium (VI) ion by using blended natural novel adsorbent like neem leaves powder with peanut shell powder. The batch Adsorption experiments were conducted by different proportions of blended neem leaf powder and peanut shells powder and variations in the weight of adsorbents, contact time at room temperature, and various pH. Investigate the concentration of adsorbate before adsorption and after adsorption by 1, 5 Diphenyl Carbazide Colorimetric method with reference to calibration curve. Results obtained by blended neem leaves powder with peanut shell powder adsor
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24

Krishna, D., and Sree R. Padma. "Modeling of Chromium (VI) adsorption on limonia acidissima hull powder using Artificial Neural Network (ANN) approach." i-manager's Journal on Chemical Sciences 2, no. 1 (2020): 32. http://dx.doi.org/10.26634/jchem.2.1.17441.

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Batch experiment was carried out for the removal of Chromium (VI) from aqueous solution to get experimental data to which an Artificial Neural Network (ANN) model was developed using 16 experimental data points (for testing) and 36 experimental data points (for training). A single layer feed forward back propagation was used to get minimum mean square error with eleven neurons in hidden layer. To develop ANN model, a tan sigmoid transfer function for input and purelin for output layers were used. The optimized process parameters viz., adsorbent dosage, pH and initial concentration of chromium
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25

Vasović, Dušanka D., and Djordje R. Stojaković. "Preparation of Chromium(III) Phthalate and Chromium(III) Pyromellitate via Chromium(VI) Oxide." Journal of Coordination Chemistry 25, no. 3 (1992): 221–27. http://dx.doi.org/10.1080/00958979209409194.

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26

Salarzadeh, I., and SA Tariq. "The Reactions of 11 Compounds of Copper, Silver and Chromium With the Molten Lithium-Sodium-Potassium Carbonate Eutectic." Australian Journal of Chemistry 39, no. 7 (1986): 1119. http://dx.doi.org/10.1071/ch9861119.

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The reactions of Cu2Cl2, CuCl2, AgCl , AgNO3, CrCl2, CrCl3, Cr2O3, K2CrO4, K2Cr2O7, K2Cr3O10 and CrO3 with the molten lithium-sodium-potassium carbonate eutectic were investigated under argon as well as carbon dioxide atmospheres. Copper(I) and copper(II) chlorides reacted to produce CuO with the evolution of CO and CO2 respectively. The silver compounds reacted to produce silver metal and a mixture of O2 and CO2. Chromium(II) and chromium(III) chlorides and Cr2O3 were converted into alkali-metal chromate(III) species. Potassium chromate(VI) was found to be stable in the eutectic. Chromium(VI)
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27

Ghaneian, Mohammad Taghi, Mohammad Hasan Ehrampoush, Asghar Mosleh Arany, Behzad Jamshidi, and Mahboobeh Dehvari. "Equilibrium and kinetic studies of Cr (VI) removal from synthetic wastewater by Acroptilon repense flower powder." Polish Journal of Chemical Technology 15, no. 2 (2013): 40–47. http://dx.doi.org/10.2478/pjct-2013-0022.

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In this study the removal of Cr (VI) from synthetic wastewater was investigated using Acroptilon repens (Russian Knapweed) flower powder under various conditions (pH, contact time and initial concentration of Cr). The capacity of chromium adsorption at equilibrium conditions by this biosorbent was increased by adsorbate concentration. The results also showed that the removal efficiency of Cr (VI) was increased by increasing the contact time. By increasing the initial concentration of Cr (VI) solution, chromium removal was reduced. The suitability of adsorbents and their constants was tested or
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28

Reena and Jayachitra A. "Hexavalent chromium bioreduction by chromium-resistant sporulating bacteria isolated from tannery effluent." Environment Conservation Journal 24, no. 4 (2023): 32–44. http://dx.doi.org/10.36953/ecj.22792588.

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The main polluting source of heavy metal contamination of water is the leather tanning industry, which uses chrome powder and discharges it into the nearby ecosystem. In this investigation, chromium-resistant bacterial strains were isolated and characterized from tannery effluent. Based on morphological and biochemical characterization, the predominant sporulating Bacillus sp. was isolated and identified as Bacillus subtilis based on 16S rRNA gene sequencing. Chromium degradation by the bacterial strain was evaluated using the flask culture method at three different concentrations (300, 600, a
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29

Madhuranthakam, Chandra Mouli R., Archana Thomas, Zhainab Akhter, Shannon Q. Fernandes, and Ali Elkamel. "Removal of Chromium(VI) from Contaminated Water Using Untreated Moringa Leaves as Biosorbent." Pollutants 1, no. 1 (2021): 51–64. http://dx.doi.org/10.3390/pollutants1010005.

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Biosorption of chromium (Cr(VI)) is studied by using raw (chemically not modified) Moringa (Moringa Oleifera) leaf powder without any pretreatment. Cr(VI) is one of the potentially harmful heavy metals found in industrial wastewater. In the Moringa leaf powder, the presence of a significant amount of organic acids form the source for the biosorption of Cr(VI). The concentration of Cr(VI) in the feed solution is varied and different dosages of the proposed biosorbent are used to study its efficiency in the removal of Cr(VI). The concentration of Cr(VI) is varied from 1 ppm to 20 ppm while the a
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30

Mulani, Khudbudin, Siona Daniels, Kishor Rajdeo, Sanjeev Tambe, and Nayaku Chavan. "Adsorption of Chromium(VI) from Aqueous Solutions by Coffee Polyphenol-Formaldehyde/Acetaldehyde Resins." Journal of Polymers 2013 (December 26, 2013): 1–11. http://dx.doi.org/10.1155/2013/798368.

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Removal of chromium(VI) from wastewater is essential as it is toxic. Thus, removal of chromium(VI) was performed using coffee polyphenol-formaldehyde/acetaldehyde resins as adsorbents. Adsorbent resins were prepared by condensation of decaffeinated coffee powder with formaldehyde/acetaldehyde and used for the removal of Cr(VI) ions from aqueous solutions. A simple and sensitive solid phase extraction procedure was applied for the determination of chromium at trace levels by spectroscopic method using 1,5-diphenylcarbazide reagent. The adsorption of Cr(VI) on the coffee polyphenol-formaldehyde/
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31

Ghammamy, Shahriare, Mohammad Kazem Mohammadi, and Ali Hassani Joshaghani. "Triethylammonium halochromates/silica gel: an efficient reagent for oxidative coupling of thiols to disulfides." Macedonian Journal of Chemistry and Chemical Engineering 27, no. 2 (2008): 117. http://dx.doi.org/10.20450/mjcce.2008.231.

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Triethylammonium halochromates, (C2H5)3NCrO3X, TEAXC (X = Cl, F) are easily synthesized by the reaction of triethylamine with a solution of chromium(VI) oxide in 6M hydrochloric acid, or a solution of chromium(VI) oxide in 40% hydrofluoric acid. These reagents are easily supported on common silica gel and can be used as heterogeneous oxidants. Triethylammonium halochromate(VI) is a versatile reagent for the effective and selective oxidation of organic substrates. Various aliphatic (cyclic and acyclic) and aromatic thiols are converted into the corresponding disulfides by treatment with triethy
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32

Sulaiman, Syazwan Liyana, Sufizar Ahmad, and Hariati Taib. "Effect of Silicon Oxide Size and Reducing Environment on the Photocatalytic Capability of Poly(Vinyl Alcohol)/Chitosan/Silicon Oxide Beads." Applied Mechanics and Materials 699 (November 2014): 1000–1005. http://dx.doi.org/10.4028/www.scientific.net/amm.699.1000.

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The present work assess the capability of silicon oxide (SiO2) nanoparticle and microparticle incorporated in poly (vinyl alcohol)/chitosan/silicon oxide (PVA/CS/SiO2) beads to reduce chromium (Cr) ions of Cr (VI) to Cr (III). PVA/CS/(nanoand micro)-SiO2beads were prepared through a simple drop wise method. The elemental analysis of prepared photocatalytic beads were confirmed by scanning electron microscopy-energy dispersive x-ray spectroscopy (SEM-EDX) and morphology of PVA/CS/SiO2beads before and after Cr ions reduction were observed with SEM. The reduction of chromium (Cr (VI)) ions by bot
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33

Sharma, Arunima, and Krishna G. Bhattacharyya. "Adsorption of Chromium (VI) on Azadirachta Indica (Neem) Leaf Powder." Adsorption 10, no. 4 (2005): 327–38. http://dx.doi.org/10.1007/s10450-005-4818-x.

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34

Zhao, Bin, Li Ke Zou, and Guo Yong Li. "Study on Treatment of Chromium(VI) Wastewater by Cuprous Oxide." Applied Mechanics and Materials 713-715 (January 2015): 2909–12. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.2909.

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Cuprous oxide catalyst was prepared and applied as photocatalist to treat chromium (VI) in wastewater, and the photocatalytic activity of the cuprous oxide was studied. The optimal conditions for the treatment was as follows: the pH of wastewater was 3, the amount of catalysts was 0.3 g/L, the reaction temperature was 60°C. Under the optimal conditions, the removal rate of chromium (IV) in wastewater reached 50% in the presence of cuprous oxide catalyst.
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35

BAEHAKI, Farhan, Ratu Betta RUDIBYANI, Suci Rizki Nurul AENI, Ryzal PERDANA, and Shindy Nur AQMARINA. "UTILIZATION OF Salacca zalacca SEEDS AS CHROMIUM(VI) ADSORBENTS." Periódico Tchê Química 17, no. 34 (2020): 200–212. http://dx.doi.org/10.52571/ptq.v17.n34.2020.217_p34_pgs_200_212.pdf.

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The Chromium(VI) waste treatment system in the textile industry activities in Indonesia is an environmental problem that really needs attention. This is because Chromium(VI) is a heavy metal that falls into the category of hazardous and toxic materials. So that it can have a negative impact on the environment and health of the body. One simple processing effort to reduce the amount of Chromium(VI) in waste is the biosorption method using organic adsorbents. One of these organic adsorbents is Salacca zalacca seeds. Salacca zalacca seeds can be used as an alternative adsorbent because they have
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Zhang, Jun Jie, Yong Li, Jin Bao Li, Yuan Gao, and Gong Dong Ma. "Investigation on Al-Cr2O3-Al2O3 Sliding Gate Performance." Advanced Materials Research 466-467 (February 2012): 242–45. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.242.

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High performance Al-Cr2O3-Al2O3 sliding gate are made from tabular corundum, white fused corundum, aluminum powder, and chromium oxide powder. Phenolic resin is used as binder. The properties of the Al-Cr2O3-Al2O3 sliding gates with the different content of chromium oxide(mass percent 3%,6%,9%,12%,15%) which are made from different processes (dried at 200°C in air, fired at 1300°Cin N2 and fired at 1450°C in CO), are researched respectively. The results show that in different processes, the samples which contain 6% chromium oxide powder have higher cold crushing strength and hot modulus of rup
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37

Wu, Qing, Ruihan Wan, Qiannan Li, et al. "Transformation of Chromium Speciation during High Hexavalent Chromium-Contaminated Soil Remediation by CPS and Biostimulation." Agronomy 12, no. 4 (2022): 801. http://dx.doi.org/10.3390/agronomy12040801.

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To address the secondary pollution problem of chemical reduction and the defects of a long bioremediation period for the soil around a chromium (Cr) salt plant in China, calcium polysulfide (CPS) combined with biostimulation (adding nutrient solution with glucose and urea) was used to reduce and stabilize hexavalent chromium [Cr(VI)] in the soil. The results showed that the remediation effect of adding CPS and nutrient solution was better than that of CPS alone for Cr(VI)-contaminated soil. An amount of 2.15% CPS with the Cr(VI) concentration reduced to approximately 330.0 mg/kg was selected a
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38

Sato, Y., K. Ijima, A. Shibayama, and R. Inoue. "Formation of hexavalent chromium in Cr-containing steelmaking slag." Archives of Materials Science and Engineering 1, no. 94 (2018): 5–10. http://dx.doi.org/10.5604/01.3001.0012.7802.

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Purpose: In present work, the mineral phases in chromium-containing slags were identified, and the formation mechanisms of Cr(VI) in Cr2O3-containing mineral phases were discussed. Design/methodology/approach: In steelmaking slag containing chromium, chromium is mainly present as spinel phases such as MgCr2O4 and (Mg,Fe)Cr2O4. When these Cr(III) oxides are oxidized to Cr(VI) oxide, the Cr(VI) is easily eluted from the slag due to its high solubility in water. Findings: The Cr (VI) adversely affects the human health and the environment. In this study, the influence of cooling rate, quenching te
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39

Gao, Yu, Ying Liu, Xu Zhao, Xinchao Liu, Qina Sun, and Tifeng Jiao. "Three-Dimensional Porous Artemia Cyst Shell Biochar-Supported Iron Oxide Nanoparticles for Efficient Removal of Chromium from Wastewater." Molecules 30, no. 8 (2025): 1743. https://doi.org/10.3390/molecules30081743.

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Chromium-containing wastewater poses severe threats to ecosystems and human health due to the high toxicity of hexavalent chromium (Cr(VI)). Although iron oxide nanoparticles (IONPs) show promise for Cr(VI) removal, their practical application is hindered by challenges in recovery and reuse. Herein, a novel three-dimensional porous nanocomposite, Artemia cyst shell biochar-supported iron oxide nanoparticles (ACSC@ IONP), was synthesized via synchronous pyrolysis of Fe3+-impregnated Artemia cyst shells (ACSs) and in situ reduction of iron. The optimized composite C@Fe-3, prepared with 1 mol/L F
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40

Jaiswal, Vivek, Harshit Ekka, Srijan Choudhary, Claritus D. Souza, Basil Joy, and S. Gowtham Sanjai. "Synthesis, Characterization of Chromium Oxide Powders and Coatings." Solid State Phenomena 350 (October 6, 2023): 41–49. http://dx.doi.org/10.4028/p-qvu6kk.

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The chromium oxide powders are transformed into plasma sprayable particles by using synthetic polymers for agglomeration. In order to carry out the agglomeration process, spray drying technique was employed. This research work highlights the significance of the process variables that control the synthesis of plasma spray powder and consequently, the properties that were suited for plasma spray coating. Energy Dispersive Spectroscopy (EDS) was used to characterize the elemental composition, while scanning electron microscopy (SEM) was used to analyse the morphology and powder grain sizes and X-
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41

Butler, Elizabeth C., Lixia Chen, Colleen M. Hansel, Lee R. Krumholz, Andrew S. Elwood Madden, and Ying Lan. "Biological versus mineralogical chromium reduction: potential for reoxidation by manganese oxide." Environmental Science: Processes & Impacts 17, no. 11 (2015): 1930–40. http://dx.doi.org/10.1039/c5em00286a.

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42

Yamazaki, Shigekazu. "Chromium(VI) Oxide-Catalyzed Benzylic Oxidation with Periodic Acid." Organic Letters 1, no. 13 (1999): 2129–32. http://dx.doi.org/10.1021/ol991175k.

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43

Dines, Trevor J., and Steven Inglis. "Raman spectroscopic study of supported chromium(vi) oxide catalysts." Physical Chemistry Chemical Physics 5, no. 6 (2003): 1320–28. http://dx.doi.org/10.1039/b211857b.

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44

Ciminale, Francesco, Michele Camporeale, Rossella Mello, Luigino Troisi, and Ruggero Curci. "Oxidation of tertiary amines by chromium(VI) oxide diperoxide." Journal of the Chemical Society, Perkin Transactions 2, no. 5 (1989): 417. http://dx.doi.org/10.1039/p29890000417.

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45

da Silva Neto, José Sabino, Vivian Stumpf Madeira, Gicélia Rodrigues, Jerlan Alves da Silva, and Mariana Fortini Moreira. "Chromium (VI) removal using cerium doped iron oxide nanoparticles." Materials Research Express 6, no. 11 (2019): 115098. http://dx.doi.org/10.1088/2053-1591/ab4b9e.

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46

Hill, W., and G. Öhlmann. "Thermal decomposition of chromium(VI)-oxide supported on silica." Reaction Kinetics and Catalysis Letters 38, no. 2 (1989): 289–94. http://dx.doi.org/10.1007/bf02062120.

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47

Ullah, Rafique, Biplob Kumer Deb, and Mohammad Yousuf Ali Mollah. "Studies on the Treatment of Wastewaters Containing Cr6+ with Iron Oxide-Silica Composite Materials Prepared by Different Methods." Defect and Diffusion Forum 353 (May 2014): 33–38. http://dx.doi.org/10.4028/www.scientific.net/ddf.353.33.

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Chromium (VI) is known to be carcinogenic to humans and thus it is important to ensure the removal of Chromium (VI) from aqueous solutions and industrial effluents. The present study introduces a good alternative method for Cr (VI) removal from aqueous solutions at ambient temperature by adsorption, allowing the development of newer, lower operational cost, and more efficient technology than other processes already in use. Adsorption was found to be dependent on pH and initial concentration of Cr (VI) solution. Results of adsorption studies suggest that pristine iron oxide and silicon (IV) oxi
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48

Kalabarige, Lakshmana Rao, D. Krishna, Upendra Kumar Potnuru, Manohar Mishra, Salman S. Alharthi, and Ravindranadh Koutavarapu. "Tree-Based Machine Learning and Nelder–Mead Optimization for Optimized Cr(VI) Removal with Indian Gooseberry Seed Powder." Water 16, no. 15 (2024): 2175. http://dx.doi.org/10.3390/w16152175.

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Wastewater containing a mixture of heavy metals, a byproduct of chemical, petrochemical, and refinery activities driven by urbanization and industrial expansion, poses significant environmental threats. Analyzing such wastewater through adsorbate-adsorbent experiments yields extensive datasets. However, traditional methodologies like the Box–Behnken design (BBD) within the response surface methodology (RSM) struggle with managing large datasets and capturing the complex, nonlinear relationships inherent in such experimental data. To address these challenges, ML techniques have emerged as promi
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49

Loubière, S., Ch Laurent, J. P. Bonino, and A. Rousset. "A metastable chromium carbide powder obtained by carburization of a metastable chromium oxide." Journal of Alloys and Compounds 243, no. 1-2 (1996): 59–66. http://dx.doi.org/10.1016/s0925-8388(96)02384-5.

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50

Nasseh, Negin, Lobat Taghavi, Behnam Barikbin, and Ali Reza Harifi-Mood. "The removal of Cr(VI) from aqueous solution by almond green hull waste material: kinetic and equilibrium studies." Journal of Water Reuse and Desalination 7, no. 4 (2016): 449–60. http://dx.doi.org/10.2166/wrd.2016.047.

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The discharge of industrial effluents containing hexavalent chromium into the environment can be very harmful to living things. Therefore, prior to effluent discharge into the environment, hexavalent chromium should be removed from contaminated water and especially from wastewaters. In the present work, almond green hull powder (AGHP) was investigated for the removal of hexavalent chromium from wastewater. The effects of pH (2–10), adsorbent dose (2–24 g L−1), Cr(VI) concentration (10–100 mg L−1), contact time (1–60 min), and temperature (5–50 °C) were studied. All the experiments were perform
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