Adsorption properties and mechanism of Cr(VI) by Fe2(SO4)3 modified biochar derived from Egeria najas

Yan Yi; Xiangyu Wang; Yaxian Zhang; Jun Ma; Ping Ning

doi:10.1016/j.colsurfa.2022.128938

Adsorption properties and mechanism of Cr(VI) by Fe₂(SO₄)₃ modified biochar derived from Egeria najas

Yan Yi
, Xiangyu Wang^*
, Yaxian Zhang
, Jun Ma
, Ping Ning

^*Corresponding author for this work

Kunming University of Science and Technology
School of Environment, Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

The aquatic plant Egeria najas based biochar was innovatively constructed by modifying it with Fe₂(SO₄)₃ (Fe₂(SO₄)₃ @EN-BC) for Cr(VI) removal. The characterizations of Fe₂(SO₄)₃ @EN-BC confirmed that Fe₂(SO₄)₃ was attached to biochar in form of Fe₂O₃ after hydrolysis and calcination under high temperature. The results showed that Fe₂(SO₄)₃ @EN-BC had a high removal efficiency of Cr(VI) with approaching 99.88%, which was about 7 times higher compared to unmodified biochar (EN-BC). Batch experiments of Cr(VI) removal included initial concentration, reaction temperature, solution pH and kinetics were conducted. The adsorption kinetics could be more accurately explained using pseudo-second order kinetics model, indicating the chemical adsorption controlled the reaction process. According to the Langmuir model, the maximum adsorption capacities for Cr(VI) were 138.79, 159.36 and 190.91 mg/g at 298, 313 and 333 K, respectively. Moreover, based on FTIR and XPS results, the Fe₂(SO₄)₃ @EN-BC surface was loaded with many functional groups conducive to Cr(VI) adsorption. The main removal mechanisms of Cr(VI) by Fe₂(SO₄)₃ @EN-BC included adsorption and reduction, and the percentage of Cr(VI) removed by adsorption and reduction were 19.1% and 80.9%, respectively.

Original language	English
Article number	128938
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	645
DOIs	https://doi.org/10.1016/j.colsurfa.2022.128938
State	Published - 20 Jul 2022
Externally published	Yes

Keywords

Adsorption mechanism
Cr(VI) removal
Egeria najas based biochar
Fe(SO) activation

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10.1016/j.colsurfa.2022.128938

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title = "Adsorption properties and mechanism of Cr(VI) by Fe2(SO4)3 modified biochar derived from Egeria najas",

abstract = "The aquatic plant Egeria najas based biochar was innovatively constructed by modifying it with Fe2(SO4)3 (Fe2(SO4)3 @EN-BC) for Cr(VI) removal. The characterizations of Fe2(SO4)3 @EN-BC confirmed that Fe2(SO4)3 was attached to biochar in form of Fe2O3 after hydrolysis and calcination under high temperature. The results showed that Fe2(SO4)3 @EN-BC had a high removal efficiency of Cr(VI) with approaching 99.88\%, which was about 7 times higher compared to unmodified biochar (EN-BC). Batch experiments of Cr(VI) removal included initial concentration, reaction temperature, solution pH and kinetics were conducted. The adsorption kinetics could be more accurately explained using pseudo-second order kinetics model, indicating the chemical adsorption controlled the reaction process. According to the Langmuir model, the maximum adsorption capacities for Cr(VI) were 138.79, 159.36 and 190.91 mg/g at 298, 313 and 333 K, respectively. Moreover, based on FTIR and XPS results, the Fe2(SO4)3 @EN-BC surface was loaded with many functional groups conducive to Cr(VI) adsorption. The main removal mechanisms of Cr(VI) by Fe2(SO4)3 @EN-BC included adsorption and reduction, and the percentage of Cr(VI) removed by adsorption and reduction were 19.1\% and 80.9\%, respectively.",

keywords = "Adsorption mechanism, Cr(VI) removal, Egeria najas based biochar, Fe(SO) activation",

author = "Yan Yi and Xiangyu Wang and Yaxian Zhang and Jun Ma and Ping Ning",

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year = "2022",

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T1 - Adsorption properties and mechanism of Cr(VI) by Fe2(SO4)3 modified biochar derived from Egeria najas

AU - Yi, Yan

AU - Wang, Xiangyu

AU - Zhang, Yaxian

AU - Ma, Jun

AU - Ning, Ping

PY - 2022/7/20

Y1 - 2022/7/20

N2 - The aquatic plant Egeria najas based biochar was innovatively constructed by modifying it with Fe2(SO4)3 (Fe2(SO4)3 @EN-BC) for Cr(VI) removal. The characterizations of Fe2(SO4)3 @EN-BC confirmed that Fe2(SO4)3 was attached to biochar in form of Fe2O3 after hydrolysis and calcination under high temperature. The results showed that Fe2(SO4)3 @EN-BC had a high removal efficiency of Cr(VI) with approaching 99.88%, which was about 7 times higher compared to unmodified biochar (EN-BC). Batch experiments of Cr(VI) removal included initial concentration, reaction temperature, solution pH and kinetics were conducted. The adsorption kinetics could be more accurately explained using pseudo-second order kinetics model, indicating the chemical adsorption controlled the reaction process. According to the Langmuir model, the maximum adsorption capacities for Cr(VI) were 138.79, 159.36 and 190.91 mg/g at 298, 313 and 333 K, respectively. Moreover, based on FTIR and XPS results, the Fe2(SO4)3 @EN-BC surface was loaded with many functional groups conducive to Cr(VI) adsorption. The main removal mechanisms of Cr(VI) by Fe2(SO4)3 @EN-BC included adsorption and reduction, and the percentage of Cr(VI) removed by adsorption and reduction were 19.1% and 80.9%, respectively.

AB - The aquatic plant Egeria najas based biochar was innovatively constructed by modifying it with Fe2(SO4)3 (Fe2(SO4)3 @EN-BC) for Cr(VI) removal. The characterizations of Fe2(SO4)3 @EN-BC confirmed that Fe2(SO4)3 was attached to biochar in form of Fe2O3 after hydrolysis and calcination under high temperature. The results showed that Fe2(SO4)3 @EN-BC had a high removal efficiency of Cr(VI) with approaching 99.88%, which was about 7 times higher compared to unmodified biochar (EN-BC). Batch experiments of Cr(VI) removal included initial concentration, reaction temperature, solution pH and kinetics were conducted. The adsorption kinetics could be more accurately explained using pseudo-second order kinetics model, indicating the chemical adsorption controlled the reaction process. According to the Langmuir model, the maximum adsorption capacities for Cr(VI) were 138.79, 159.36 and 190.91 mg/g at 298, 313 and 333 K, respectively. Moreover, based on FTIR and XPS results, the Fe2(SO4)3 @EN-BC surface was loaded with many functional groups conducive to Cr(VI) adsorption. The main removal mechanisms of Cr(VI) by Fe2(SO4)3 @EN-BC included adsorption and reduction, and the percentage of Cr(VI) removed by adsorption and reduction were 19.1% and 80.9%, respectively.

KW - Adsorption mechanism

KW - Cr(VI) removal

KW - Egeria najas based biochar

KW - Fe(SO) activation

UR - https://www.scopus.com/pages/publications/85127634850

U2 - 10.1016/j.colsurfa.2022.128938

DO - 10.1016/j.colsurfa.2022.128938

M3 - 文章

AN - SCOPUS:85127634850

SN - 0927-7757

VL - 645

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

M1 - 128938

ER -

Adsorption properties and mechanism of Cr(VI) by Fe₂(SO₄)₃ modified biochar derived from Egeria najas

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Keywords

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