Enhanced As(III) removal from aqueous solution by Fe-Mn-La-impregnated biochar composites

A novel Fe-Mn-La-impregnated biochar composite (FMLBC) was synthesized using an impregnation method for efficient As (III) adsorption. The pseudo-second-order model (R2 values are 0.996, 0.996, and 0.994 for different FMLBC rate used) better fitted the kinetic adsorption of arsenic (As) on the FMLBC...

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Vydáno v:The Science of the total environment Ročník 686; s. 1185 - 1193
Hlavní autoři: Lin, Lina, Song, Zhengguo, Khan, Zulqarnain Haider, Liu, Xuewei, Qiu, Weiwen
Médium: Journal Article
Jazyk:angličtina
Vydáno: Netherlands Elsevier B.V 10.10.2019
Témata:
adsorbents
Adsorption
aqueous solutions
arsenic
Arsenic (As)
biochar
electrostatic interactions
energy-dispersive X-ray analysis
Fe-Mn-La-impregnated biochar composite (FMLBC)
Fourier transform infrared spectroscopy
iron
ligands
manganese
Mechanism
nitrates
phosphates
scanning electron microscopy
sulfates
X-ray photoelectron spectroscopy
Fe-Mn-La-impregnated biochar composite (FMLBC)
Adsorption
Mechanism
Arsenic (As)
ISSN:0048-9697, 1879-1026, 1879-1026
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Shrnutí:A novel Fe-Mn-La-impregnated biochar composite (FMLBC) was synthesized using an impregnation method for efficient As (III) adsorption. The pseudo-second-order model (R2 values are 0.996, 0.996, and 0.994 for different FMLBC rate used) better fitted the kinetic adsorption of arsenic (As) on the FMLBC than the pseudo-first order model (R2 values are 0.978, 0.971, and 0.991 respectively). The SEM-EDS, FTIR and XPS results confirmed the addition of Fe, Mn and La into the BC structure. Compared with pristine biochar (3.73 mg g−1) and Fe-Mn-impregnated biochar (9.48 mg g−1), the As (III) adsorption capacity of Fe-Mn-La impregnated biochar (14.9 mg g−1) was significantly improved. The presence of NO3− and SO42− did not influence As adsorption, whereas PO43− influenced As removal. The mechanism of As adsorption on the FMLBC involved oxidization, electrostatic attraction, ligand exchange, and formation of an inner-sphere R-O-As complex. Among them, the electrostatic attraction and inner-sphere complexation contributed the most. The simple preparation process and high adsorption performance suggest that the FMLBC could be served as a promising adsorbent for As (III) removal from aqueous solution. [Display omitted] •Fe-Mn-La impregnated biochar (FMLBC) was prepared through an easily synthetized method.•As (III) adsorption capacity of Fe-Mn-La impregnated biochar (14.9 mg g−1) was significantly improved.•The adsorption mechanism of arsenic is mainly electrostatic attraction and inner-sphere complexation.•LaO plays an important role in As adsorption due to formation of La-O-As complex.
Bibliografie:ObjectType-Article-1
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ISSN:0048-9697
1879-1026
1879-1026
DOI:10.1016/j.scitotenv.2019.05.480