Sorption of arsenic onto Ni/Fe layered double hydroxide (LDH)-biochar composites
Biochar is a carbon-enriched material that has been investigated for use as a remediation agent for environmental contaminants. However, in order for biochar to see practical use for metal removal, it has to be modified to improve its sorption efficiency. Layered double hydroxides (LDHs) are robust...
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| Published in | RSC advances Vol. 6; no. 22; pp. 17792 - 17799 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
01.01.2016
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| Subjects | |
| Online Access | Get full text |
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| Abstract | Biochar is a carbon-enriched material that has been investigated for use as a remediation agent for environmental contaminants. However, in order for biochar to see practical use for metal removal, it has to be modified to improve its sorption efficiency. Layered double hydroxides (LDHs) are robust sorbents for removal of a wide array of contaminants. Thus, two LDH-biochar composites were produced by (1) pyrolysis of Ni/Fe-LDH-modified pine feedstock (NFMF), and (2) precipitation of LDHs onto pristine biochars (NFMB). Both composites were characterized and tested for their ability to remove arsenate [As(
v
)] from aqueous solution. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and energy-dispersive X-ray analyses suggested that Ni/Fe-LDH had a layered structure that was anchored on the carbonaceous surface in both NFMF and NFMB. The maximum As(
v
) sorption capacity of NFMF and NFMB (1.56 g kg
−1
and 4.38 g kg
−1
, respectively) was greatly enhanced over that of the unmodified one. The results, such as increased sorption at lower solution pH, indicated that electrostatic attraction and surface complexation with hydroxyl (-OH) groups were the main As(
v
) sorption mechanisms for both sorbents. The good stability and As(
v
) sorption make Ni/Fe-LDH modified biochars high-potential sorbents for environmental remediation.
Biochar is a carbon-enriched material that has been investigated for use as a remediation agent for environmental contaminants. |
|---|---|
| AbstractList | Biochar is a carbon-enriched material that has been investigated for use as a remediation agent for environmental contaminants. However, in order for biochar to see practical use for metal removal, it has to be modified to improve its sorption efficiency. Layered double hydroxides (LDHs) are robust sorbents for removal of a wide array of contaminants. Thus, two LDH-biochar composites were produced by (1) pyrolysis of Ni/Fe-LDH-modified pine feedstock (NFMF), and (2) precipitation of LDHs onto pristine biochars (NFMB). Both composites were characterized and tested for their ability to remove arsenate [As(
v
)] from aqueous solution. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and energy-dispersive X-ray analyses suggested that Ni/Fe-LDH had a layered structure that was anchored on the carbonaceous surface in both NFMF and NFMB. The maximum As(
v
) sorption capacity of NFMF and NFMB (1.56 g kg
−1
and 4.38 g kg
−1
, respectively) was greatly enhanced over that of the unmodified one. The results, such as increased sorption at lower solution pH, indicated that electrostatic attraction and surface complexation with hydroxyl (-OH) groups were the main As(
v
) sorption mechanisms for both sorbents. The good stability and As(
v
) sorption make Ni/Fe-LDH modified biochars high-potential sorbents for environmental remediation.
Biochar is a carbon-enriched material that has been investigated for use as a remediation agent for environmental contaminants. Biochar is a carbon-enriched material that has been investigated for use as a remediation agent for environmental contaminants. However, in order for biochar to see practical use for metal removal, it has to be modified to improve its sorption efficiency. Layered double hydroxides (LDHs) are robust sorbents for removal of a wide array of contaminants. Thus, two LDH-biochar composites were produced by (1) pyrolysis of Ni/Fe-LDH-modified pine feedstock (NFMF), and (2) precipitation of LDHs onto pristine biochars (NFMB). Both composites were characterized and tested for their ability to remove arsenate [As(v)] from aqueous solution. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and energy-dispersive X-ray analyses suggested that Ni/Fe-LDH had a layered structure that was anchored on the carbonaceous surface in both NFMF and NFMB. The maximum As(v) sorption capacity of NFMF and NFMB (1.56 g kg⁻¹ and 4.38 g kg⁻¹, respectively) was greatly enhanced over that of the unmodified one. The results, such as increased sorption at lower solution pH, indicated that electrostatic attraction and surface complexation with hydroxyl (–OH) groups were the main As(v) sorption mechanisms for both sorbents. The good stability and As(v) sorption make Ni/Fe-LDH modified biochars high-potential sorbents for environmental remediation. Biochar is a carbon-enriched material that has been investigated for use as a remediation agent for environmental contaminants. However, in order for biochar to see practical use for metal removal, it has to be modified to improve its sorption efficiency. Layered double hydroxides (LDHs) are robust sorbents for removal of a wide array of contaminants. Thus, two LDH-biochar composites were produced by (1) pyrolysis of Ni/Fe-LDH-modified pine feedstock (NFMF), and (2) precipitation of LDHs onto pristine biochars (NFMB). Both composites were characterized and tested for their ability to remove arsenate [As(v)] from aqueous solution. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and energy-dispersive X-ray analyses suggested that Ni/Fe-LDH had a layered structure that was anchored on the carbonaceous surface in both NFMF and NFMB. The maximum As(v) sorption capacity of NFMF and NFMB (1.56 g kg super(-1) and 4.38 g kg super(-1), respectively) was greatly enhanced over that of the unmodified one. The results, such as increased sorption at lower solution pH, indicated that electrostatic attraction and surface complexation with hydroxyl (-OH) groups were the main As(v) sorption mechanisms for both sorbents. The good stability and As(v) sorption make Ni/Fe-LDH modified biochars high-potential sorbents for environmental remediation. Biochar is a carbon-enriched material that has been investigated for use as a remediation agent for environmental contaminants. However, in order for biochar to see practical use for metal removal, it has to be modified to improve its sorption efficiency. Layered double hydroxides (LDHs) are robust sorbents for removal of a wide array of contaminants. Thus, two LDH-biochar composites were produced by (1) pyrolysis of Ni/Fe-LDH-modified pine feedstock (NFMF), and (2) precipitation of LDHs onto pristine biochars (NFMB). Both composites were characterized and tested for their ability to remove arsenate [As( v )] from aqueous solution. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and energy-dispersive X-ray analyses suggested that Ni/Fe-LDH had a layered structure that was anchored on the carbonaceous surface in both NFMF and NFMB. The maximum As( v ) sorption capacity of NFMF and NFMB (1.56 g kg −1 and 4.38 g kg −1 , respectively) was greatly enhanced over that of the unmodified one. The results, such as increased sorption at lower solution pH, indicated that electrostatic attraction and surface complexation with hydroxyl (–OH) groups were the main As( v ) sorption mechanisms for both sorbents. The good stability and As( v ) sorption make Ni/Fe-LDH modified biochars high-potential sorbents for environmental remediation. |
| Author | Gao, Bin Li, Yuncong Cao, Xinde Zimmerman, Andrew R Wang, Shengsen |
| AuthorAffiliation | Tropical Research and Education Center Shanghai Jiaotong University University of Florida Department of Geological Sciences Department of Agricultural and Biological Engineering School of Environmental Science and Engineering Soil and Water Science Department |
| AuthorAffiliation_xml | – sequence: 0 name: Department of Geological Sciences – sequence: 0 name: Department of Agricultural and Biological Engineering – sequence: 0 name: Tropical Research and Education Center – sequence: 0 name: Soil and Water Science Department – sequence: 0 name: Shanghai Jiaotong University – sequence: 0 name: University of Florida – sequence: 0 name: School of Environmental Science and Engineering |
| Author_xml | – sequence: 1 givenname: Shengsen surname: Wang fullname: Wang, Shengsen – sequence: 2 givenname: Bin surname: Gao fullname: Gao, Bin – sequence: 3 givenname: Yuncong surname: Li fullname: Li, Yuncong – sequence: 4 givenname: Andrew R surname: Zimmerman fullname: Zimmerman, Andrew R – sequence: 5 givenname: Xinde surname: Cao fullname: Cao, Xinde |
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| SubjectTerms | aqueous solutions Arrays arsenates arsenic biochar Contaminants electrostatic interactions energy-dispersive X-ray analysis feedstocks Hydroxides iron Nickel pollution pyrolysis Remediation scanning electron microscopy Sorbents Sorption X-ray diffraction X-ray photoelectron spectroscopy X-rays |
| Title | Sorption of arsenic onto Ni/Fe layered double hydroxide (LDH)-biochar composites |
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