TY - JOUR
T1 - Arsenic removal by perilla leaf biochar in aqueous solutions and groundwater
T2 - An integrated spectroscopic and microscopic examination
AU - Niazi, Nabeel Khan
AU - Bibi, Irshad
AU - Shahid, Muhammad
AU - Ok, Yong Sik
AU - Burton, Edward D.
AU - Wang, Hailong
AU - Shaheen, Sabry M.
AU - Rinklebe, Jörg
AU - Lüttge, Andreas
N1 - Funding Information:
The authors are thankful to the International Foundation for Science (IFS, Sweden; W/5698-1), Grand Challenges Canada ? Stars in Global Health (GCC 0433-01) and Higher Education Commission, Pakistan for financial support (Projects Nos. 6396 and 6425). This work was supported by the National Research Foundation of Korea (NRF) (NRF-2015R1A2A2A11001432). Biochar samples were produced and fully characterized by the Korea Biochar Research Center (KBRC). Drs Nabeel Khan Niazi and Irshad Bibi are thankful to the University of Agriculture Faisalabad (Pakistan) and the University of Bremen (Germany), and thanks are extended by Dr Bibi (Ref 3.5 - PAK - 1164117 - GFHERMES-P) and Professor Shaheen (Ref 3.4 - EGY - 1185373 - GF-E) to the Alexander von Humboldt Foundation for a Postdoctoral Research Fellowship. We are thankful to Mr M. Bilal Shakoor (Research Fellow, UAF) and Ms Avanthi Deshani Igalavithana (KNU) for their partial assistance in some laboratory work. The authors thank the members of the Pohang Accelerator Laboratory (PAL), Korea for providing synchrotron user facilities for XAFS spectroscopy experimentation.
Funding Information:
The authors are thankful to the International Foundation for Science (IFS, Sweden; W/5698-1 ), Grand Challenges Canada – Stars in Global Health (GCC 0433-01 ) and Higher Education Commission, Pakistan for financial support (Projects Nos. 6396 and 6425 ). This work was supported by the National Research Foundation of Korea (NRF) ( NRF-2015R1A2A2A11001432 ). Biochar samples were produced and fully characterized by the Korea Biochar Research Center (KBRC). Drs Nabeel Khan Niazi and Irshad Bibi are thankful to the University of Agriculture Faisalabad (Pakistan) and the University of Bremen (Germany) , and thanks are extended by Dr Bibi (Ref 3.5 - PAK - 1164117 - GFHERMES-P) and Professor Shaheen (Ref 3.4 - EGY - 1185373 - GF-E) to the Alexander von Humboldt Foundation for a Postdoctoral Research Fellowship. We are thankful to Mr M. Bilal Shakoor (Research Fellow, UAF) and Ms Avanthi Deshani Igalavithana (KNU) for their partial assistance in some laboratory work. The authors thank the members of the Pohang Accelerator Laboratory (PAL), Korea for providing synchrotron user facilities for XAFS spectroscopy experimentation.
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/1
Y1 - 2018/1
N2 - In this study, we examined the removal of arsenite (As(III)) and arsenate (As(V)) by perilla leaf-derived biochars produced at 300 and 700 °C (referred as BC300 and BC700) in aqueous environments. Results revealed that the Langmuir isotherm model provided the best fit for As(III) and As(V) sorption, with the sorption affinity following the order: BC700-As(III) > BC700-As(V) > BC300-As(III) > BC300-As(V) (QL = 3.85–11.01 mg g−1). In general, As removal decreased (76–60%) with increasing pH from 7 to 10 except for the BC700-As(III) system, where notably higher As removal (88–90%) occurred at pH from 7 to 9. Surface functional moieties contributed to As sequestration by the biochars examined here. However, significantly higher surface area and aromaticity of BC700 favored a greater As removal compared to BC300, suggesting that surface complexation/precipitation dominated As removal by BC700. Arsenic K-edge X-ray absorption near edge structure (XANES) spectroscopy demonstrated that up to 64% of the added As(V) was reduced to As(III) in BC700- and BC300-As(V) sorption experiments, and in As(III) sorption experiments, partial oxidation of As(III) to As(V) occurred (37–39%). However, XANES spectroscopy was limited to precisely quantify As binding with sulfur species as As2S3-like phase. Both biochars efficiently removed As from natural As-contaminated groundwater (As: 23–190 μg L−1; n = 12) despite in the presence of co-occurring anions (e.g., CO32−, PO43−, SO42−) with the highest levels of As removal observed for BC700 (97–100%). Overall, this study highlights that perilla leaf biochars, notably BC700, possessed the greatest ability to remove As from solution and groundwater (drinking water). Significantly, the integrated spectroscopic techniques advanced our understanding to examine complex redox transformation of As(III)/As(V) with biochar, which are crucial to determine fate of As on biochar in aquatic environments. Our study shows that perilla leaf biochars efficiently removed As (As(III), As(V)) in aqueous solutions and groundwater (drinking water), and integrated spectroscopic techniques determined complex fate of As on biochars.
AB - In this study, we examined the removal of arsenite (As(III)) and arsenate (As(V)) by perilla leaf-derived biochars produced at 300 and 700 °C (referred as BC300 and BC700) in aqueous environments. Results revealed that the Langmuir isotherm model provided the best fit for As(III) and As(V) sorption, with the sorption affinity following the order: BC700-As(III) > BC700-As(V) > BC300-As(III) > BC300-As(V) (QL = 3.85–11.01 mg g−1). In general, As removal decreased (76–60%) with increasing pH from 7 to 10 except for the BC700-As(III) system, where notably higher As removal (88–90%) occurred at pH from 7 to 9. Surface functional moieties contributed to As sequestration by the biochars examined here. However, significantly higher surface area and aromaticity of BC700 favored a greater As removal compared to BC300, suggesting that surface complexation/precipitation dominated As removal by BC700. Arsenic K-edge X-ray absorption near edge structure (XANES) spectroscopy demonstrated that up to 64% of the added As(V) was reduced to As(III) in BC700- and BC300-As(V) sorption experiments, and in As(III) sorption experiments, partial oxidation of As(III) to As(V) occurred (37–39%). However, XANES spectroscopy was limited to precisely quantify As binding with sulfur species as As2S3-like phase. Both biochars efficiently removed As from natural As-contaminated groundwater (As: 23–190 μg L−1; n = 12) despite in the presence of co-occurring anions (e.g., CO32−, PO43−, SO42−) with the highest levels of As removal observed for BC700 (97–100%). Overall, this study highlights that perilla leaf biochars, notably BC700, possessed the greatest ability to remove As from solution and groundwater (drinking water). Significantly, the integrated spectroscopic techniques advanced our understanding to examine complex redox transformation of As(III)/As(V) with biochar, which are crucial to determine fate of As on biochar in aquatic environments. Our study shows that perilla leaf biochars efficiently removed As (As(III), As(V)) in aqueous solutions and groundwater (drinking water), and integrated spectroscopic techniques determined complex fate of As on biochars.
KW - Arsenic toxicity
KW - Drinking water
KW - Groundwater remediation
KW - Sorbent
KW - Water filtration
KW - XANES
UR - http://www.scopus.com/inward/record.url?scp=85030464555&partnerID=8YFLogxK
U2 - 10.1016/j.envpol.2017.09.051
DO - 10.1016/j.envpol.2017.09.051
M3 - Article
C2 - 28966026
AN - SCOPUS:85030464555
SN - 0269-7491
VL - 232
SP - 31
EP - 41
JO - Environmental Pollution
JF - Environmental Pollution
ER -