TY - JOUR
T1 - Lead removal from aqueous solutions by olive mill wastes derived biochar
T2 - Batch experiments and geochemical modelling
AU - Kypritidou, Zacharenia
AU - El-Bassi, Leila
AU - Jellali, Salah
AU - Kinigopoulou, Vasiliki
AU - Tziritis, Evangelos
AU - Akrout, Hanene
AU - Jeguirim, Mejdi
AU - Doulgeris, Charalampos
N1 - Funding Information:
The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Charalampos Doulgeris, Leila El-Bassi reports financial support was provided by ARIMNet2 - European Union’s Seventh Framework Programme for research, technological development and demonstration.
Funding Information:
This work was funded by FERTICHAR project , through the ARIMNet2 Joint Call by the following funding agencies: MHESRT (Tunisia), ANR (France), and HAO DEMETER (Greece). ARIMNet2 (ERA-NET) has received funding from the European Union's Seventh Framework Programme for research, technological development and demonstration under grant agreement no. 618127 . The authors gratefully acknowledge the funding agencies for their support
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/9/1
Y1 - 2022/9/1
N2 - In this study, lead removal from aqueous solutions using biochar derived from olive mill solid and liquid wastes has been investigated by applying batch experiments and geochemical modelling. The batch adsorption experiments included the assessment of several key parameters such as the contact time (kinetic), initial concentration (isotherm), pH, adsorbent dose, and the presence of competitive cations, whilst the geochemical modelling focused on the involved adsorption mechanisms using the PHREEQC code. The kinetic studies showed that lead adsorption is a relatively fast process, where intraparticle diffusion is the rate-limiting step. Biochar dose, solution pH and the presence of competitive ions significantly affected the Pb adsorption effectiveness by the biochar. Especially the higher Pb removal percentages were observed in mono-elemental solutions with high biochar dose at mildly acidic solution pH values. The maximum Pb adsorption capacity of biochar was estimated as 40.8 mg g−1 which is higher than various biochars derived from sludge, lignocellulosic and animal biomasses. On the other hand, the geochemical modelling employing the PHREEQC code showed that ion exchange and Pb precipitation are the main reactions controlling its removal from aqueous solutions, whilst surface complexation is insignificant, mainly due to the low surface functional groups on the used biochar.
AB - In this study, lead removal from aqueous solutions using biochar derived from olive mill solid and liquid wastes has been investigated by applying batch experiments and geochemical modelling. The batch adsorption experiments included the assessment of several key parameters such as the contact time (kinetic), initial concentration (isotherm), pH, adsorbent dose, and the presence of competitive cations, whilst the geochemical modelling focused on the involved adsorption mechanisms using the PHREEQC code. The kinetic studies showed that lead adsorption is a relatively fast process, where intraparticle diffusion is the rate-limiting step. Biochar dose, solution pH and the presence of competitive ions significantly affected the Pb adsorption effectiveness by the biochar. Especially the higher Pb removal percentages were observed in mono-elemental solutions with high biochar dose at mildly acidic solution pH values. The maximum Pb adsorption capacity of biochar was estimated as 40.8 mg g−1 which is higher than various biochars derived from sludge, lignocellulosic and animal biomasses. On the other hand, the geochemical modelling employing the PHREEQC code showed that ion exchange and Pb precipitation are the main reactions controlling its removal from aqueous solutions, whilst surface complexation is insignificant, mainly due to the low surface functional groups on the used biochar.
KW - Batch experiments
KW - Biochar
KW - Lead removal
KW - Olive oil wastes
KW - PHREEQC
KW - Sorption mechanisms
KW - Water
KW - Water Pollutants, Chemical
KW - Animals
KW - Adsorption
KW - Solutions
KW - Lead
KW - Kinetics
KW - Olea
KW - Charcoal
KW - Hydrogen-Ion Concentration
UR - http://www.scopus.com/inward/record.url?scp=85133436388&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85133436388&partnerID=8YFLogxK
U2 - 10.1016/j.jenvman.2022.115562
DO - 10.1016/j.jenvman.2022.115562
M3 - Article
C2 - 35764000
AN - SCOPUS:85133436388
SN - 0301-4797
VL - 318
SP - 115562
JO - Journal of Environmental Management
JF - Journal of Environmental Management
M1 - 115562
ER -