Enhanced Cr(VI) removal from acidic solutions using biochar modified by Fe3O4@SiO2-NH2 particles

Shunquan Shi; Jiakuan Yang; Sha Liang; Mingyang Li; Quan Gan; Keke Xiao; Jingping Hu

doi:10.1016/j.scitotenv.2018.02.091

Enhanced Cr(VI) removal from acidic solutions using biochar modified by Fe₃O₄@SiO₂-NH₂ particles

Shunquan Shi, Jiakuan Yang, Sha Liang^*, Mingyang Li, Quan Gan, Keke Xiao, Jingping Hu

^*Corresponding author for this work

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

245 Scopus citations

Abstract

Fe₃O₄@SiO₂-NH₂ magnetic particles with core-shell structure were attached on carboxylated biochar derived from phoenix tree leaves to synthesize a novel magnetic biochar for removing Cr(VI) ions from acidic solutions. FSEM, FTEM, XRD characterizations of the synthesized magnetic biochar revealed that the Fe₃O₄@SiO₂-NH₂ magnetic particles distributed uniformly on the surface or macrospores of carboxylated biochar by strong chemical bonding. The Cr(VI) ions adsorption capacity of magnetic biochar was 27.2 mg·g⁻¹, surpassing original carboxylated biochar (18.2 mg·g⁻¹). VSM and XPS characterizations demonstrated that the attached Fe₃O₄@SiO₂-NH₂ magnetic particles not only endowed biochar with perfect magnetic property (23 emu·g⁻¹) but also provided complexing sites for binding Cr(III) cations reduced from Cr(VI) anions. The Cr(VI) ions removal by magnetic biochar contained three steps: (1) adsorption of Cr(VI) anions by protonated functional groups; (2) reduction of Cr(VI) anions to Cr(III) cations by electron-donor groups; and (3) chelation of Cr(III) cations by amine groups. The adsorption recycling test showed that magnetic biochar kept 85% of its initial Cr(VI) adsorption capacity at the sixth cycle, and the Fe leakage under pH 1.0 was smaller than 0.25 mg·L⁻¹. The results indicated that this novel magnetic biochar was applicable for the practical treatment of Cr(VI)-containing wastewater.

Original language	English
Pages (from-to)	499-508
Number of pages	10
Journal	Science of the Total Environment
Volume	628-629
DOIs	https://doi.org/10.1016/j.scitotenv.2018.02.091
State	Published - 1 Jul 2018
Externally published	Yes

Keywords

Cr(III) immobilization
Cr(VI) removal
FeO@SiO-NH particles
Magnetic biochar

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10.1016/j.scitotenv.2018.02.091

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title = "Enhanced Cr(VI) removal from acidic solutions using biochar modified by Fe3O4@SiO2-NH2 particles",

abstract = "Fe3O4@SiO2-NH2 magnetic particles with core-shell structure were attached on carboxylated biochar derived from phoenix tree leaves to synthesize a novel magnetic biochar for removing Cr(VI) ions from acidic solutions. FSEM, FTEM, XRD characterizations of the synthesized magnetic biochar revealed that the Fe3O4@SiO2-NH2 magnetic particles distributed uniformly on the surface or macrospores of carboxylated biochar by strong chemical bonding. The Cr(VI) ions adsorption capacity of magnetic biochar was 27.2 mg·g−1, surpassing original carboxylated biochar (18.2 mg·g−1). VSM and XPS characterizations demonstrated that the attached Fe3O4@SiO2-NH2 magnetic particles not only endowed biochar with perfect magnetic property (23 emu·g−1) but also provided complexing sites for binding Cr(III) cations reduced from Cr(VI) anions. The Cr(VI) ions removal by magnetic biochar contained three steps: (1) adsorption of Cr(VI) anions by protonated functional groups; (2) reduction of Cr(VI) anions to Cr(III) cations by electron-donor groups; and (3) chelation of Cr(III) cations by amine groups. The adsorption recycling test showed that magnetic biochar kept 85% of its initial Cr(VI) adsorption capacity at the sixth cycle, and the Fe leakage under pH 1.0 was smaller than 0.25 mg·L−1. The results indicated that this novel magnetic biochar was applicable for the practical treatment of Cr(VI)-containing wastewater.",

keywords = "Cr(III) immobilization, Cr(VI) removal, FeO@SiO-NH particles, Magnetic biochar",

author = "Shunquan Shi and Jiakuan Yang and Sha Liang and Mingyang Li and Quan Gan and Keke Xiao and Jingping Hu",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2018",

month = jul,

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doi = "10.1016/j.scitotenv.2018.02.091",

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TY - JOUR

T1 - Enhanced Cr(VI) removal from acidic solutions using biochar modified by Fe3O4@SiO2-NH2 particles

AU - Shi, Shunquan

AU - Yang, Jiakuan

AU - Liang, Sha

AU - Li, Mingyang

AU - Gan, Quan

AU - Xiao, Keke

AU - Hu, Jingping

PY - 2018/7/1

Y1 - 2018/7/1

N2 - Fe3O4@SiO2-NH2 magnetic particles with core-shell structure were attached on carboxylated biochar derived from phoenix tree leaves to synthesize a novel magnetic biochar for removing Cr(VI) ions from acidic solutions. FSEM, FTEM, XRD characterizations of the synthesized magnetic biochar revealed that the Fe3O4@SiO2-NH2 magnetic particles distributed uniformly on the surface or macrospores of carboxylated biochar by strong chemical bonding. The Cr(VI) ions adsorption capacity of magnetic biochar was 27.2 mg·g−1, surpassing original carboxylated biochar (18.2 mg·g−1). VSM and XPS characterizations demonstrated that the attached Fe3O4@SiO2-NH2 magnetic particles not only endowed biochar with perfect magnetic property (23 emu·g−1) but also provided complexing sites for binding Cr(III) cations reduced from Cr(VI) anions. The Cr(VI) ions removal by magnetic biochar contained three steps: (1) adsorption of Cr(VI) anions by protonated functional groups; (2) reduction of Cr(VI) anions to Cr(III) cations by electron-donor groups; and (3) chelation of Cr(III) cations by amine groups. The adsorption recycling test showed that magnetic biochar kept 85% of its initial Cr(VI) adsorption capacity at the sixth cycle, and the Fe leakage under pH 1.0 was smaller than 0.25 mg·L−1. The results indicated that this novel magnetic biochar was applicable for the practical treatment of Cr(VI)-containing wastewater.

AB - Fe3O4@SiO2-NH2 magnetic particles with core-shell structure were attached on carboxylated biochar derived from phoenix tree leaves to synthesize a novel magnetic biochar for removing Cr(VI) ions from acidic solutions. FSEM, FTEM, XRD characterizations of the synthesized magnetic biochar revealed that the Fe3O4@SiO2-NH2 magnetic particles distributed uniformly on the surface or macrospores of carboxylated biochar by strong chemical bonding. The Cr(VI) ions adsorption capacity of magnetic biochar was 27.2 mg·g−1, surpassing original carboxylated biochar (18.2 mg·g−1). VSM and XPS characterizations demonstrated that the attached Fe3O4@SiO2-NH2 magnetic particles not only endowed biochar with perfect magnetic property (23 emu·g−1) but also provided complexing sites for binding Cr(III) cations reduced from Cr(VI) anions. The Cr(VI) ions removal by magnetic biochar contained three steps: (1) adsorption of Cr(VI) anions by protonated functional groups; (2) reduction of Cr(VI) anions to Cr(III) cations by electron-donor groups; and (3) chelation of Cr(III) cations by amine groups. The adsorption recycling test showed that magnetic biochar kept 85% of its initial Cr(VI) adsorption capacity at the sixth cycle, and the Fe leakage under pH 1.0 was smaller than 0.25 mg·L−1. The results indicated that this novel magnetic biochar was applicable for the practical treatment of Cr(VI)-containing wastewater.

KW - Cr(III) immobilization

KW - Cr(VI) removal

KW - FeO@SiO-NH particles

KW - Magnetic biochar

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U2 - 10.1016/j.scitotenv.2018.02.091

DO - 10.1016/j.scitotenv.2018.02.091

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C2 - 29453179

AN - SCOPUS:85041900693

SN - 0048-9697

VL - 628-629

SP - 499

EP - 508

JO - Science of the Total Environment

JF - Science of the Total Environment

ER -

Enhanced Cr(VI) removal from acidic solutions using biochar modified by Fe₃O₄@SiO₂-NH₂ particles

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Keywords

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