Variable surface charge of humic acid-ferrihydrite composite: Influence of electrolytes on ciprofloxacin adsorption

Cristian Urdiales; Manuel Gacitua; Loreto Villacura; Carmen Pizarro; Mauricio Escudey; Camila Canales; Mónica Antilén

doi:10.1016/j.jhazmat.2019.121520

Variable surface charge of humic acid-ferrihydrite composite: Influence of electrolytes on ciprofloxacin adsorption

Cristian Urdiales, Manuel Gacitua, Loreto Villacura, Carmen Pizarro, Mauricio Escudey, Camila Canales, Mónica Antilén^*

^*Corresponding author for this work

Science Institute

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Antimicrobial compounds are found in a range of environments as pollutants. Here, we evaluated the influence of two common anions, NO₃⁻ and PO₄^3-, on ciprofloxacin adsorption on humic acid/ferrihydrite composite (HA-DIG/Fh), synthetic ferrihydrite (Fh), and humic acid (HA-DIG) under controlled pH (7.0), ionic strength (0.1 M) and temperature (25 °C). All materials were characterized by isoelectric point (IEP), while the composite and the iron oxide were characterized by Mössbauer spectroscopy. Kinetic and isotherm adsorption studies were carried out using cyclic voltammetry (in KH₂PO₄) and square wave voltammetry (in KNO₃). The application of kinetic models for both anions revealed Fh to fit to a pseudo second order model (R² = 0.941); while HA-DIG (R² = 0.950) and HA-DIG/Fh (R² = 0.993) were fitted to pseudo first order models. The adsorption results showed a high dependency electrolyte, especially in Fh, where different shape curves (H-type in KNO₃ and C-type in KH₂PO₄) and maximum experimental adsorbed amount C_m were observed. This finding is supported by the distinct IEP values and change in sign of surface charge between the two ions. Finally, results suggest that HA-DIG could be potentially used in environmental remediation to remove antibiotics from natural matrices, though the risk of antibiotic transportation increased with depth in the soil profile.

Original language	English
Article number	121520
Journal	Journal of Hazardous Materials
Volume	385
DOIs	https://doi.org/10.1016/j.jhazmat.2019.121520
Publication status	Published - 5 Mar 2020

Bibliographical note

Funding Information:
Support from Fondecyt project 1130094, Puente 2018 (P1811) , Dicyt–USACH 021742PA , Proyecto Fondo Fortalecimiento USA1799 , Basal Funding for Scientific and Technological Centers of Excellence FB0807 CEDENNA and CONICYT PIA/ANILLO ACM 170002 are kindly acknowledged. We thank Alyssa Gurbe for support in language assistance.

Publisher Copyright:
© 2019 Elsevier B.V.

Other keywords

Antibiotics
Iron oxides
Mössbauer spectroscopy
Natural organic matter
Sorption models

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10.1016/j.jhazmat.2019.121520

Cite this

@article{a3823bd8d25843e5ab7c01423fd3b265,

title = "Variable surface charge of humic acid-ferrihydrite composite: Influence of electrolytes on ciprofloxacin adsorption",

abstract = "Antimicrobial compounds are found in a range of environments as pollutants. Here, we evaluated the influence of two common anions, NO3− and PO43-, on ciprofloxacin adsorption on humic acid/ferrihydrite composite (HA-DIG/Fh), synthetic ferrihydrite (Fh), and humic acid (HA-DIG) under controlled pH (7.0), ionic strength (0.1 M) and temperature (25 °C). All materials were characterized by isoelectric point (IEP), while the composite and the iron oxide were characterized by M{\"o}ssbauer spectroscopy. Kinetic and isotherm adsorption studies were carried out using cyclic voltammetry (in KH2PO4) and square wave voltammetry (in KNO3). The application of kinetic models for both anions revealed Fh to fit to a pseudo second order model (R2 = 0.941); while HA-DIG (R2 = 0.950) and HA-DIG/Fh (R2 = 0.993) were fitted to pseudo first order models. The adsorption results showed a high dependency electrolyte, especially in Fh, where different shape curves (H-type in KNO3 and C-type in KH2PO4) and maximum experimental adsorbed amount Cm were observed. This finding is supported by the distinct IEP values and change in sign of surface charge between the two ions. Finally, results suggest that HA-DIG could be potentially used in environmental remediation to remove antibiotics from natural matrices, though the risk of antibiotic transportation increased with depth in the soil profile.",

keywords = "Antibiotics, Iron oxides, M{\"o}ssbauer spectroscopy, Natural organic matter, Sorption models",

author = "Cristian Urdiales and Manuel Gacitua and Loreto Villacura and Carmen Pizarro and Mauricio Escudey and Camila Canales and M{\'o}nica Antil{\'e}n",

note = "Funding Information: Support from Fondecyt project 1130094, Puente 2018 (P1811) , Dicyt–USACH 021742PA , Proyecto Fondo Fortalecimiento USA1799 , Basal Funding for Scientific and Technological Centers of Excellence FB0807 CEDENNA and CONICYT PIA/ANILLO ACM 170002 are kindly acknowledged. We thank Alyssa Gurbe for support in language assistance. Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2020",

month = mar,

day = "5",

doi = "10.1016/j.jhazmat.2019.121520",

language = "English",

volume = "385",

journal = "Journal of Hazardous Materials",

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TY - JOUR

T1 - Variable surface charge of humic acid-ferrihydrite composite

T2 - Influence of electrolytes on ciprofloxacin adsorption

AU - Urdiales, Cristian

AU - Gacitua, Manuel

AU - Villacura, Loreto

AU - Pizarro, Carmen

AU - Escudey, Mauricio

AU - Canales, Camila

AU - Antilén, Mónica

N1 - Funding Information: Support from Fondecyt project 1130094, Puente 2018 (P1811) , Dicyt–USACH 021742PA , Proyecto Fondo Fortalecimiento USA1799 , Basal Funding for Scientific and Technological Centers of Excellence FB0807 CEDENNA and CONICYT PIA/ANILLO ACM 170002 are kindly acknowledged. We thank Alyssa Gurbe for support in language assistance. Publisher Copyright: © 2019 Elsevier B.V.

PY - 2020/3/5

Y1 - 2020/3/5

N2 - Antimicrobial compounds are found in a range of environments as pollutants. Here, we evaluated the influence of two common anions, NO3− and PO43-, on ciprofloxacin adsorption on humic acid/ferrihydrite composite (HA-DIG/Fh), synthetic ferrihydrite (Fh), and humic acid (HA-DIG) under controlled pH (7.0), ionic strength (0.1 M) and temperature (25 °C). All materials were characterized by isoelectric point (IEP), while the composite and the iron oxide were characterized by Mössbauer spectroscopy. Kinetic and isotherm adsorption studies were carried out using cyclic voltammetry (in KH2PO4) and square wave voltammetry (in KNO3). The application of kinetic models for both anions revealed Fh to fit to a pseudo second order model (R2 = 0.941); while HA-DIG (R2 = 0.950) and HA-DIG/Fh (R2 = 0.993) were fitted to pseudo first order models. The adsorption results showed a high dependency electrolyte, especially in Fh, where different shape curves (H-type in KNO3 and C-type in KH2PO4) and maximum experimental adsorbed amount Cm were observed. This finding is supported by the distinct IEP values and change in sign of surface charge between the two ions. Finally, results suggest that HA-DIG could be potentially used in environmental remediation to remove antibiotics from natural matrices, though the risk of antibiotic transportation increased with depth in the soil profile.

AB - Antimicrobial compounds are found in a range of environments as pollutants. Here, we evaluated the influence of two common anions, NO3− and PO43-, on ciprofloxacin adsorption on humic acid/ferrihydrite composite (HA-DIG/Fh), synthetic ferrihydrite (Fh), and humic acid (HA-DIG) under controlled pH (7.0), ionic strength (0.1 M) and temperature (25 °C). All materials were characterized by isoelectric point (IEP), while the composite and the iron oxide were characterized by Mössbauer spectroscopy. Kinetic and isotherm adsorption studies were carried out using cyclic voltammetry (in KH2PO4) and square wave voltammetry (in KNO3). The application of kinetic models for both anions revealed Fh to fit to a pseudo second order model (R2 = 0.941); while HA-DIG (R2 = 0.950) and HA-DIG/Fh (R2 = 0.993) were fitted to pseudo first order models. The adsorption results showed a high dependency electrolyte, especially in Fh, where different shape curves (H-type in KNO3 and C-type in KH2PO4) and maximum experimental adsorbed amount Cm were observed. This finding is supported by the distinct IEP values and change in sign of surface charge between the two ions. Finally, results suggest that HA-DIG could be potentially used in environmental remediation to remove antibiotics from natural matrices, though the risk of antibiotic transportation increased with depth in the soil profile.

KW - Antibiotics

KW - Iron oxides

KW - Mössbauer spectroscopy

KW - Natural organic matter

KW - Sorption models

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U2 - 10.1016/j.jhazmat.2019.121520

DO - 10.1016/j.jhazmat.2019.121520

M3 - Article

C2 - 31784135

AN - SCOPUS:85075872538

SN - 0304-3894

VL - 385

JO - Journal of Hazardous Materials

JF - Journal of Hazardous Materials

M1 - 121520

ER -

Variable surface charge of humic acid-ferrihydrite composite: Influence of electrolytes on ciprofloxacin adsorption

Abstract

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