Adsorption mechanisms of hexavalent chromium from aqueous solutions on modified activated carbons

Valentín-Reyes, Jonathan; García-Reyes, Refugio Bernardo; García-González, Alcione; Soto-Regalado, Eduardo; Cerino-Córdova, F. J.

doi:10.1016/j.jenvman.2019.02.014

Cited by 122 publications

(29 citation statements)

References 43 publications

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“…Due to their low concentration over AC, their contribution towards adsorption has been considered very small. It is also probable that the electron donating surface functionalities of M-AC, as well as magnetic Fe +2 , may cause the reduction of Cr (VI) to Cr (III), which may further be adsorbed over anionic site via ion exchange adsorption mechanism [ 58 ].…”

Section: Resultsmentioning

confidence: 99%

Utilization of Tires Waste-Derived Magnetic-Activated Carbon for the Removal of Hexavalent Chromium from Wastewater

et al. 2020

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The present study focuses on fabrication of magnetic activated carbon (M-AC) using tire waste and its potential investigation for adsorption of Cr (VI) from wastewater. The composite material (M-AC) was synthesized by pyrolysis followed by in situ magnetization method, and characterized by FTIR, FESEM, EDX, and XRD analysis. The maximum adsorption of Cr (VI) ion over composite adsorbent was found (~99.5%) to occur at pH 2, sample volume 10 mL, adsorbent dose 100 mg, contact time 30 min. The adsorption process was endothermic, feasible, spontaneous, and was found to follow pseudo second order of the reaction. The Cr ion could be completely desorbed (~99.3%) from the composite adsorbent by using 20 mL of 2 M NaOH solution. The composite adsorbent was regenerated by continuous adsorption and desorption for 5 consecutive cycles by using 10 mL 0.1 M HCl solution. M-AC also performed well in case of tannery wastewater by removing about 97% of Cr (VI).

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Section: Resultsmentioning

confidence: 99%

Utilization of Tires Waste-Derived Magnetic-Activated Carbon for the Removal of Hexavalent Chromium from Wastewater

et al. 2020

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“…For example, the excessive emission of harmful substances, such as industrial waste gases (e.g., H 2 S, SO 2 , NO X , and CO 2 ), will cause acid rain, soil pollution, photochemical smog, and greenhouse effects. [ 2 ] Moreover, excessive levels of heavy metals in drinking water or food can cause a variety of diseases in human beings, [ 5,7‐9 ] resulting in brain damage, liver damage, anemia, miscarriage, cancer, and even death. Similarly, excessive levels of organic compounds (e.g., aniline) in industrial wastewater can have serious consequences, causing methemoglobinemia, hemolytic anemia, liver damage, and kidney damage.…”

Section: Introductionmentioning

confidence: 99%

An overview of low‐temperature plasma surface modification of carbon materials for removal of pollutants from liquid and gas phases

Huang

et al. 2020

Plasma Processes & Polymers

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As a promising surface treatment technique, low‐temperature plasma (LTP) technology has been widely used over the past two decades. Herein, the surface modification of carbon materials using LTP treatment is reviewed to clarify the modification effects. First, the basic details of LTP treatment are summarized. Second, the surface morphology, pore structure, surface chemistry, adsorption performance, and catalytic characteristics of LTP‐treated carbon materials are reviewed. Finally, the research required to further develop LTP technology for the surface modification of carbon materials is discussed. This review will contribute toward advancing the application of LTP‐treated carbon materials in environmental pollution control.

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“…In this study, the morphology and structure of PSh were carefully investigated through various measurements. The surface functional groups of PSh were estimated by the Boehm method (Valentín-Reyes et al 2019). This method is based on the neutralization of oxygenated functions by three bases having different strengths, sodium carbonate (Na 2 CO 3 ), sodium bicarbonate (NaHCO 3 ) and sodium hydroxide (NaOH) in order to determine the nature and amounts of surface functionalities among carboxylic, phenolic and lactonic groups (Kim et al 2012).…”

Section: Characterization Of the Pshmentioning

confidence: 99%

Modelling and optimization of hexavalent chromium removal from aqueous solution by adsorption on low-cost agricultural waste biomass using response surface methodological approach

Rzig

Guesmi

Hamrouni

2021

Water Science and Technology

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In this study, response surface methodology (RSM) approach using central composite design (CCD) was investigated to develop mathematical model and to optimize the effects of pH, adsorbent amount and temperature related to the hexavalent chromium removal by biosorption on peanut shells (PSh). The highest removal percentage of 30.28% was found by the predicted model under the optimum conditions (pH of 2.11, 0.73 g of PSh and 37.2 °C) for a 100 mg/L initial Cr (VI) concentration, which was very near to the experimental value (29.92%). The PSh was characterized by SEM, EDX, FTIR, BET, XRD analysis. Moreover, Langmuir isotherm fitted well (R2 = 0.992) with the experimental data, and the maximum adsorption capacity was discovered to be 2.48 and 3.49 mg/g respectively at 25 and 45 °C. Kinetic data was well foreseen by pseudo second order. Thermodynamic study depicted that biosorption of Cr(VI) onto PSh was spontaneous and endothermic. Regeneration of the PSh using NaOH showed a loss <5% in the Cr (VI) removal efficiency till three recycle runs. In summary, the Cr (VI) removal onto economic, sensitive and selective biosorbent (PSh) optimized using CCD to study biosorption behaviors.

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Adsorption mechanisms of hexavalent chromium from aqueous solutions on modified activated carbons

Cited by 122 publications

References 43 publications

Utilization of Tires Waste-Derived Magnetic-Activated Carbon for the Removal of Hexavalent Chromium from Wastewater

Utilization of Tires Waste-Derived Magnetic-Activated Carbon for the Removal of Hexavalent Chromium from Wastewater

An overview of low‐temperature plasma surface modification of carbon materials for removal of pollutants from liquid and gas phases

Modelling and optimization of hexavalent chromium removal from aqueous solution by adsorption on low-cost agricultural waste biomass using response surface methodological approach

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