Efficient adsorption of dyes from aqueous solution using a novel functionalized magnetic biochar: Synthesis, kinetics, isotherms, adsorption mechanism, and reusability

Li, Xiumin; Xu, Jinlan; Luo, Xianxin; Shi, Jingxin

doi:10.1016/j.biortech.2022.127526

Cited by 63 publications

(15 citation statements)

References 49 publications

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“…Moreover, the Sips exponents (β > 1) of PFOS and PFOA indicated that the adsorption process might be dominated by heterogeneity with supported sites of different affinities. This result confirmed that the adsorption of PFOS and PFOA on H-SL biochar was a complex process with physical sorption and chemical sorption . In conclusion, the adsorption process of PFOS and PFOA on H-SL biochar might be dominated by heterogeneous physical sorption and chemical sorption.…”

Section: Resultssupporting

confidence: 78%

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Enhanced Removal of Polyfluoroalkyl Substances by Simple Modified Biochar: Adsorption Performance and Theoretical Calculation

et al. 2023

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To cope with the widespread polyfluoroalkyl substance (PFAS) pollution in the global aquatic environment, this study prepared an acid-modified biochar adsorbent derived from sludge with satisfactory performance. The theoretical maximum adsorption capacities of the adsorbent for perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) were determined to be 72.17 and 45.88 mg·g–1, respectively. The theoretical calculation of the adsorption of biochar surface functional groups with PFOS and PFOA was first performed in this study, and the mechanism of the adsorption process was inferred with a combination of experimental results and redundancy analysis. The adsorption mechanism is composed mainly of the following three aspects: (I) electrostatic interaction between the positively charged biochar and the deprotonated PFAS; (II) hydrogen bonding between anionic species of PFAS and functional groups; and (III) hydrophobic interaction between long-chain hydrophobic PFAS and biochar. Electrostatic interaction plays a major role in the three main adsorption mechanisms under acidic media. Meanwhile, different functional groups have different adsorption energies for PFAS, and CO has the highest adsorption energy. The findings in this work could provide great insights into the adsorption of PFAS on modified biochar as an environmentally friendly adsorbent to promote resource reuse, improve water quality, and ensure human health.

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Section: Resultssupporting

confidence: 78%

“…This result confirmed that the adsorption of PFOS and PFOA on H-SL biochar was a complex process with physical sorption and chemical sorption. 34 In conclusion, the adsorption process of PFOS and PFOA on H-SL biochar might be dominated by heterogeneous physical sorption and chemical sorption.…”

Section: Adsorption Performance Of Pfasmentioning

confidence: 90%

Enhanced Removal of Polyfluoroalkyl Substances by Simple Modified Biochar: Adsorption Performance and Theoretical Calculation

et al. 2023

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“…With the decrease in the number of adsorption sites, the samples entered the slow stage, and the adsorption rate slowed and gradually approached equilibrium 56 . In comparison, the Elovich model had the best fitting effect on adsorption ( R 2 > 0.944), indicating that the adsorption of Cd 2+ by corn stover biochar occurred by heterogeneous chemisorption 57 . The results were consistent with the previous adsorption mechanism.…”

Section: Resultsmentioning

confidence: 95%

Adsorption characteristics and mechanisms of Cd2+ from aqueous solution by biochar derived from corn stover

Chen

Sun

Liang

et al. 2022

Sci Rep

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Corn stover could be pyrolysed to prepare biochar for removing pollutants in water and realizing the resource utilization of biomass. The aims of the present study were to investigate the optimal preparation and adsorption conditions of biochar and to reveal the adsorption characteristics and mechanisms of Cd2+ in water by biochar. For this purpose, with Cd2+ as the target pollutant, the pyrolysis conditions involved in the pyrolysis temperature, retention time, and heating rate were evaluated and optimized. Additionally, the characteristics, mechanisms and optimal adsorption conditions of Cd2+ by biochar were determined. A series of characterization techniques was employed, including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and specific surface area analysis (SBET). The optimum pyrolysis parameters were a pyrolysis temperature of 700 °C, a retention time of 2.5 h, and a heating rate of 5 °C/min. Acid/base modification did not improve the adsorption capacity of biochar. The Langmuir and the Elovich model were the most suitable isotherm and kinetic models for equilibrium data, respectively. The maximum adsorption capacity fitted by Langmuir model was 13.4 mg/g. Furthermore, mineral precipitation and π electron interactions were shown to be the main adsorption mechanisms of Cd2+. The optimum adsorption conditions for Cd2+ in water were a CaCl2 electrolyte solution of 0.01 mol/L, a pH level of 6.7, and a biochar dosage of 0.4 g. Our results indicated that corn stover biochar was an appropriate approach for improving the status of water with Cd2+ contamination in the short term and for promoting a new perspective for the rational utilization of corn stover and the low-cost pollution control of heavy metals in water.

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“…The peak of C=C in the FTIR spectra of SDMBC600 shifted from 1662 to 1673 cm −1 after the adsorption of diuron, which indicated that π–π binding was involved in diuron adsorption [ 50 ]. The peak of –OH shifted from 3502 to 3522 cm −1 in SDMBC600 and its intensity increased evidently, indicating that the hydrogen bond was involved in the adsorption of diuron [ 51 ]. Moreover, the Fe–O and Zn–O peaks in the FTIR spectra of SDMBC600 moved and their intensity decreased after the adsorption of diuron, providing evidence for surface complexation [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

A Stable Fe-Zn Modified Sludge-Derived Biochar for Diuron Removal: Kinetics, Isotherms, Mechanism, and Practical Research

Liu

Wang

et al. 2023

Molecules

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To remove typical herbicide diuron effectively, a novel sludge-derived modified biochar (SDMBC600) was prepared using sludge-derived biochar (SDBC600) as raw material and Fe-Zn as an activator and modifier in this study. The physico-chemical properties of SDMBC600 and the adsorption behavior of diuron on the SDMBC600 were studied systematically. The adsorption mechanisms as well as practical applications of SDMBC600 were also investigated and examined. The results showed that the SDMBC600 was chemically loaded with Fe-Zn and SDMBC600 had a larger specific surface area (204 m2/g) and pore volume (0.0985 cm3/g). The adsorption of diuron on SDMBC600 followed pseudo-second-order kinetics and the Langmuir isotherm model, with a maximum diuron adsorption capacity of 17.7 mg/g. The biochar could maintain a good adsorption performance (8.88–12.9 mg/g) under wide water quality conditions, in the pH of 2–10 and with the presence of humic acid and six typical metallic ions of 0–20 mg/L. The adsorption mechanisms of SDMBC600 for diuron were found to include surface complexation, π–π binding, hydrogen bonding, as well as pore filling. Additionally, the SDMBC600 was tested to be very stable with very low Fe and Zn leaching concentration ≤0.203 mg/L in the wide pH range. In addition, the SDMBC600 could maintain a high adsorption capacity (99.6%) after four times of regeneration and therefore, SDMBC600 could have a promising application for diuron removal in water treatment.

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Efficient adsorption of dyes from aqueous solution using a novel functionalized magnetic biochar: Synthesis, kinetics, isotherms, adsorption mechanism, and reusability

Cited by 63 publications

References 49 publications

Enhanced Removal of Polyfluoroalkyl Substances by Simple Modified Biochar: Adsorption Performance and Theoretical Calculation

Enhanced Removal of Polyfluoroalkyl Substances by Simple Modified Biochar: Adsorption Performance and Theoretical Calculation

Adsorption characteristics and mechanisms of Cd2+ from aqueous solution by biochar derived from corn stover

A Stable Fe-Zn Modified Sludge-Derived Biochar for Diuron Removal: Kinetics, Isotherms, Mechanism, and Practical Research

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