Adsorption of arsenic, phosphorus and chromium by bismuth impregnated biochar: Adsorption mechanism and depleted adsorbent utilization

Zhu, Ningyuan; Yan, Tingmei; Qiao, Jun; Cao, Honglei

doi:10.1016/j.chemosphere.2016.08.036

Cited by 247 publications

(83 citation statements)

References 35 publications

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“…According to Figure a, the highest adsorption capacity for chromium ions was reached 4.6 mg g −1 at pH 3.0, which is consistent with previous researches . While, with increasing initial pH values from 3.0 to 7.0 the adsorption capacities of Cr (VI) decreased from 4.6 to 0.5 mg g −1 .…”

Section: Resultssupporting

confidence: 90%

Synthesis of amidoximated polyacrylonitrile fibers and its use as adsorbent for Cr (VI) ions removal from aqueous solutions

Bouchoum

Benmoussa

Jada

et al. 2019

Env Prog and Sustain Energy

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Functionalized fibers, especially polyacrylonitrile fibers (PANF), have attracted wide interest as an effective and economical material for environment and water protection. In this study, polyacrylonitrile fibers modified with hydroxylamine hydrochloride were used as an adsorbent to remove hexavalent chromium ions from aqueous solutions. The novelty of the present study compared to the literature is the functionalization of polyacrylonitrile fibers surface by optimizing cost and energy while achieving a yield fast removal rate and high adsorption capacity of hexavalent chromium from aqueous solutions. The amidoximated polyacrylonitrile fibers were characterized using Fourier Transform InfraRed spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The results confirmed the success of polyacrylonitrile fibers modification. The adsorption capacity was evaluated by investigating the effect of initial pH solution ranging from 2.0 to 7.0, the adsorbent dose varied from 0.05 to 0.25 g, the initial Cr (VI) concentration range was (5–70 mg g−1), the temperature varied from 5 to 60°C, and the contact time ranged from 0 to 180 min. We have used the Langmuir and Freundlich adsorption models to describe the equilibrium sorption data. The maximum adsorption capacity estimated using the Langmuir model reached 32. 57 mg g−1 under optimal conditions. The thermodynamic parameters (ΔG, ΔH, and ΔS) were also determined. In addition, the adsorbent showed a desorption rate of Cr (VI) up to 92% with 0.5 mol of NaOH, which can be reused for three adsorption–desorption cycles. The overall data showed the efficiency of amidoximated polyacrylonitrile fibers in removing Cr (VI) from aqueous solutions. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

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Section: Resultssupporting

confidence: 90%

Synthesis of amidoximated polyacrylonitrile fibers and its use as adsorbent for Cr (VI) ions removal from aqueous solutions

Bouchoum

Benmoussa

Jada

et al. 2019

Env Prog and Sustain Energy

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“…The pseudo-second-order equation was observed to best describe the adsorption kinetic of V(Ⅴ) onto the three soils at 25°C. Similar observations were made in other studies where the pseudo-second-order equation was more suitable than other equations for the characterization of kinetic data of anionic adsorption onto soils or other materials [32][33][34]. The Elovich equation confirmed that chemisorption process is the main adsorption process in the studied sorption system.…”

Section: Adsorption Kineticssupporting

confidence: 88%

Sorption of vanadium (V) on three typical agricultural soil of the Loess Plateau, China

Jiang

Yin

Luo

et al. 2019

Environmental Pollutants and Bioavailability

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Selected three soil (yellow cinnamon soil, manual loessial soil and aeolian sandy soil) to study the kinetics and isotherms sorption of V(Ⅴ), and further explore the differences in the adsorption mechanism caused by initial V (V) concentration, ionic strength (IS), pH and different reaction times. It was observed that V(Ⅴ) adsorption onto the soil had three processes and completed rapid adsorption in 60, 100 and 120 min. The maximum adsorbing capacity of V(Ⅴ) on yellow cinnamon soil, manual loessial soil and aeolian sandy soil reached stable in pH range from 4 to 8. The adsorption capacity decreased with the increase of IS. V(Ⅴ) adsorption onto soil varied greatly with mineralogy and properties of soil, the surface area, soil organic carbon content and composition of particulate matter. This research enhanced the understanding of how soil properties affect vanadium (V) sorption onto agricultural soil.To investigate the reaction mechanism between vanadium (Ⅴ) and soil, and further explore the differences in the adsorption mechanism caused by initial V(V) concentration, ionic strength, pH and different reaction times. Selected three soil (yellow cinnamon soil, manual loessial soil and aeolian sandy soil) which are the typical agricultural soil from Shaanxi province to study the kinetics and isotherms sorption of V(Ⅴ). SEM study is used to probe the morphological features of the soil in the presence of vanadium and to investigate the change of surface functional groups on the three soils after adsorption by the FTIR spectra. It was observed that V(Ⅴ) adsorption onto the soil had three processes and completed rapid adsorption in 60 min, 100 min and 120 min. The maximum adsorption concentration of V(Ⅴ) derived from experimental data for the yellow cinnamon soil, manual loessial soil and aeolian sandy soil were 1124.6mg kg, 854.4mg kg and 748.6mg kg, respectively. The maximum adsorbing capacity of V(Ⅴ) on yellow cinnamon soil, manual loessial soil and aeolian sandy soil reached stable in the pH range from 4.0 to 8.0. The adsorption capacity decreased with the increase of ionic strength. V(Ⅴ) adsorption onto soil varied greatly with mineralogy and physical-chemical properties of soil, the BET surface area, soil organic carbon content and composition of particulate matter. This research enhanced the understanding of how soil properties affect vanadium (V) sorption onto agricultural soil.

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“…Small globular particles which come from the polymer particles of reed decomposition can be seen precipitated over thin fibers. The cross-linked structure which was made up by the lignin and cellulose in reed was broken in the HTC process as the cellulose was hydrolyzed into aqueous phase [26,27]. Compared with lignin, the microcrystal structure of cellulose is relatively easily damaged under higher temperature conditions and the results were demonstrated in the FTIR analysis.…”

Section: Characterization Of Reed and Biocharmentioning

confidence: 72%

Efficient Low Temperature Hydrothermal Carbonization of Chinese Reed for Biochar with High Energy Density

2017

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Hydrothermal carbonization (HTC), as an environmental friendly process, presents wide potential applicability for converting biomass to biochar with high energy density. Reed, a major energy crop, was converted by a HTC process in a batch reactor at 200-280 • C for 0.5 to 4 h. Biochar mass yield changed from 66.7% to 19.2% and high heating value (HHV) from 20.0 kJ/g to 28.3 kJ/g, respectively, by increasing the carbonization temperature from 200 • C to 280 • C and decreasing the residence time from 2 h to 1 h. The Fourier Transform infrared spectroscopy (FTIR), X-ray Diffraction (XRD), and Scanning Electron Microscope (SEM) results indicated the lignocellulosic crosslink structure of reed is broken and biochar having a high energy density is obtained with the increase of temperature. The microcrystal features of reed are destroyed and biochar contained mainly lignin fractions. The HTC of biocrude is carried out at 200-280 • C for 2.0 h and the results showed that the obtained biochar has uniform particles filled with carbon microspheres.

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Adsorption of arsenic, phosphorus and chromium by bismuth impregnated biochar: Adsorption mechanism and depleted adsorbent utilization

Cited by 247 publications

References 35 publications

Synthesis of amidoximated polyacrylonitrile fibers and its use as adsorbent for Cr (VI) ions removal from aqueous solutions

Synthesis of amidoximated polyacrylonitrile fibers and its use as adsorbent for Cr (VI) ions removal from aqueous solutions

Sorption of vanadium (V) on three typical agricultural soil of the Loess Plateau, China

Efficient Low Temperature Hydrothermal Carbonization of Chinese Reed for Biochar with High Energy Density

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