Removal of Cr(VI) by biochar derived via co-pyrolysis of oily sludge and corn stalks

Han, Lei; Li, Jinling; Zhang, Tiantian; Qu, Chengtun; Yu, Tao; Yang, Bo; Shao, Zhihong

doi:10.1038/s41598-022-14142-9

Cited by 7 publications

(3 citation statements)

References 61 publications

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“…In strong acidic solution (pH < 1), the removal rate of total chromium increased while the removal rate of Cr(VI) declined, and total chromium removal rates were always lower than Cr(VI) [45] . This reveals that the conversion of Cr(VI) to trivalent chromium bene ts with an increase in the acidity of the solution, and a part of trivalent chromium ions occurred in solution.…”

Section: The Effect Of Phmentioning

confidence: 97%

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Research on the performance of modified blue coke in adsorbing hexavalent chromium

Wang

Song

et al. 2023

Preprint

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To solve the issue of hexavalent chromium (Cr(VI)) contamination in water bodies, blue coke powder (LC) was chemically changed using potassium hydroxide to create the modified material (GLC), which was then used to treat a Cr(VI)-containing wastewater solution. The differences between the modified and unmodified blue coke's adsorption characteristics for Cr(VI) were studied, and the impact of pH, starting solution concentration, and adsorption period on the GLC's adsorption performance was investigated. The adsorption behavior of the GLC was analyzed using isothermal adsorption models, kinetic models, and adsorption thermodynamic analysis. The mechanism of Cr(VI) adsorption by the GLC was investigated using characterization techniques such as Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscope (FE-SEM), X-Ray Diffraction (XRD), and X-Ray Photoelectron Spectroscopy (XPS). With the biggest difference in removal rate at pH = 2, which was 2.42 times that of LC, bath adsorption experiments revealed that, under the same adsorption conditions, the GLC always performed better than LC. With a specific surface area that was three times that of LC and an average pore diameter that was 0.67 times that of LC, GLC had a more porous structure than LC. The alteration significantly increased the amount of hydroxyls on the surface of GLC by altering the structural makeup of LC. The ideal pH for removing Cr(VI) was 2, and the ideal GLC adsorbent dosage was 2.0 g/L. Pseudo-second-order kinetic model and Redlich-Peterson model can effectively describe the adsorption behavior of GLC for Cr(VI). Physical and chemical adsorption work together to remove Cr(VI) by GLC in a spontaneous, exothermic, and entropy-increasing process, with oxidation-reduction processes playing a key role. GLC is a potent adsorbent that can be used to remove Cr(VI) from aqueous solutions.

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Section: The Effect Of Phmentioning

confidence: 97%

“…When a signi cant number of H + ions were present, Cr(VI) was changed to Cr(III). The speci c reaction equation is as follows [45] :…”

Section: The Effect Of Phmentioning

confidence: 99%

Research on the performance of modified blue coke in adsorbing hexavalent chromium

Wang

Song

et al. 2023

Preprint

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“…Using KOH as the activator can effectively improve the adsorption capacity of activated carbon for a variety of pollutants; increase the content of hydroxyl groups, carboxyl groups and other functional groups in the biochar; improve the pore structure of the biochar; and change the adsorption performance [ 16 ]. Liu [ 17 ] and Han [ 18 ] et al have investigated the adsorption of organic materials and heavy metals on oily sludge-derived activated carbon.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Oily Sludge-Derived Activated Carbon and Its Adsorption Performance for Tetracycline Hydrochloride

Long,

He,

Przystupa

et al. 2024

Molecules

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Oily sludge-derived activated carbon was prepared using the potassium hydroxide (KOH) activation method using oily sludge as a raw material, and one-factor experiments determined the best conditions for preparing activated carbon. The activated carbon’s morphological structure and surface chemical properties were analyzed by scanning different characterization tools, and the adsorption behavior of tetracycline hydrochloride was investigated. The results showed that the optimum conditions for preparing oily sludge-derived activated carbon were an activation temperature of 400 °C, activation time of 30 min, activator concentration of 1 mol/L, and impregnation ratio of 2 mL/g. After activation, the activated carbon had more pores and a more orderly crystal structure arrangement, the specific surface area was 2.07 times higher than that before activation, and the surface was rich in functional groups such as -HO, -C-O, -C=C, and -C-H, which increased the active sites of activated carbon. Physicochemical effects dominated the adsorption process. It belonged to the spontaneous heat absorption process under the quasi-secondary kinetic and Langmuir isothermal models. The maximum monolayer adsorption capacity of KOH-activated carbon was 205.1 mg·g−1.

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High efficient COVID-19 waste co-pyrolysis char/TiO2 nanocomposite for photocatalytic reduction of Cr(VI) under visible light

Nallaselvam,

Rajamohan,

Kalaiarasu

et al. 2023

Environ Sci Pollut Res

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Removal of Cr(VI) by biochar derived via co-pyrolysis of oily sludge and corn stalks

Cited by 7 publications

References 61 publications

Research on the performance of modified blue coke in adsorbing hexavalent chromium

Research on the performance of modified blue coke in adsorbing hexavalent chromium

Preparation of Oily Sludge-Derived Activated Carbon and Its Adsorption Performance for Tetracycline Hydrochloride

High efficient COVID-19 waste co-pyrolysis char/TiO2 nanocomposite for photocatalytic reduction of Cr(VI) under visible light

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