TY - JOUR
T1 - Surface interactions during the removal of emerging contaminants by hydrochar-based adsorbents
AU - Román, Silvia
AU - Nabais, Joâo Manuel Valente
AU - Ledesma, Beatriz
AU - Laginhas, Carlos
AU - Titirici, Maria Magdalena
N1 - Funding: The work was partially funded by the FCT (Grant FRH/BD/82696/2011) with National (OE) and European Union (FEDER, program COMPETE of QREN) funds. The authors are also grateful to Junta de Extremadura and FEDER (Fondo Europeo de Desarrollo Regional “Una manera de hacer Europa”), for financial help by project IB16108, and also to the program “Ayudas a grupos de la Junta de Extremadura” GR18150.
Acknowledgments: The authors are grateful for the SAIUEX (Servicios de Apoyo a la Investigación de la Universidad de Extremadura) for their help in textural and surface chemistry analysis of the hydrochars.
PY - 2020/5/1
Y1 - 2020/5/1
N2 - The aim of this work was to test activated carbons derived from hydrochars produced from sunflower stem, olive stone and walnut shells, as adsorbents for emerging contaminants in aqueous solution, namely fluoxetine and nicotinic acid. The adsorption capacity was determined by the chemical nature of the adsorbents, namely the presence of specific functional groups and their positive or negative ionization in aqueous solutions and also by steric factors. The activated carbons produced by air showed a higher adsorption capacity of fluoxetine, whilst the samples produced by carbon dioxide activation were more useful to remove nicotinic acid. In general, surface acidity was advantageous for fluoxetine adsorption and detrimental for nicotinic acid removal. The adsorption mechanisms involved in each case were discussed and related to the adsorbents characteristics. The maximum adsorption capacity, Q0, given by the Langmuir model was 44.1 and 91.9 mg g-1 for fluoxetine and nicotinic acid adsorption, respectively.
AB - The aim of this work was to test activated carbons derived from hydrochars produced from sunflower stem, olive stone and walnut shells, as adsorbents for emerging contaminants in aqueous solution, namely fluoxetine and nicotinic acid. The adsorption capacity was determined by the chemical nature of the adsorbents, namely the presence of specific functional groups and their positive or negative ionization in aqueous solutions and also by steric factors. The activated carbons produced by air showed a higher adsorption capacity of fluoxetine, whilst the samples produced by carbon dioxide activation were more useful to remove nicotinic acid. In general, surface acidity was advantageous for fluoxetine adsorption and detrimental for nicotinic acid removal. The adsorption mechanisms involved in each case were discussed and related to the adsorbents characteristics. The maximum adsorption capacity, Q0, given by the Langmuir model was 44.1 and 91.9 mg g-1 for fluoxetine and nicotinic acid adsorption, respectively.
KW - Activated carbons
KW - Adsorption
KW - Hydrocarbonization
KW - Pharmaceutical effluents
KW - Water
UR - http://www.scopus.com/inward/record.url?scp=85084447250&partnerID=8YFLogxK
U2 - 10.3390/molecules25092264
DO - 10.3390/molecules25092264
M3 - Article
C2 - 32403348
AN - SCOPUS:85084447250
VL - 25
JO - Molecules
JF - Molecules
SN - 1420-3049
IS - 9
M1 - 2264
ER -