Ligand-based poly(phenylenediamine) adsorbents for enhanced removal of phosphate from water

Lindani Mdlalose; Mohammed Balogun; Katlego Setshedi; Māris Kļaviņš; Luke Chimuka; Avashnee Chetty

doi:10.1007/s00289-021-03922-4

Ligand-based poly(phenylenediamine) adsorbents for enhanced removal of phosphate from water

Lindani Mdlalose^*
, Mohammed Balogun
, Katlego Setshedi
, Māris Kļaviņš
, Luke Chimuka
, Avashnee Chetty

^*Corresponding author for this work

Department of Environmental Science

Council for Scientific and Industrial Research
University of the Witwatersrand

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

2 Citations (Scopus)

Abstract

Phosphorus removal from effluents is vital to avoid eutrophication. The subject study presents the development and performance of poly(phenylenediamine) isometric adsorbents produced through oxidation using (NH₄)₂S₂O₈ and K₂Cr₂O₇ oxidants. K₂Cr₂O₇ synthesized polymers showed better adsorption capacities. The presence of Cr Lewis acid on the surface endorsed phosphate interaction through inner-sphere complex mechanism. The maximum adsorption capacities for K₂Cr₂O₇ synthesized polymers were 143, 217 and 69.0 mg/L for poly(o-phenylenediamine), poly(m-phenylenediamine) and poly(p-phenylenediamine) adsorbents, respectively. The superior performance of poly(m-phenylenediamine) was associated with minimal symmetrical arrangement, hence it was more amorphous as indicated by XRD patterns. Kinetic model fitted pseudo-second-order and isotherm favoured Langmuir. Adsorption process was also controlled by pore diffusion and external mass transfer in the sorbent. Poly(m-phenylenediamine) displayed high affinity in the presence of competing anions and was amenable to recycling.

Original language	English
Pages (from-to)	8743-8763
Number of pages	21
Journal	Polymer Bulletin
Volume	79
Issue number	10
DOIs	https://doi.org/10.1007/s00289-021-03922-4
Publication status	Published - Oct 2022

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 14 Life Below Water

Keywords

Phosphates
Regeneration
Poly(phenylenediamine) isomers
Adsorption
Inner-sphere complexing

OECD Field of Science

1.5 Earth and Related Environmental Sciences

Access to Document

10.1007/s00289-021-03922-4

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title = "Ligand-based poly(phenylenediamine) adsorbents for enhanced removal of phosphate from water",

abstract = "Phosphorus removal from effluents is vital to avoid eutrophication. The subject study presents the development and performance of poly(phenylenediamine) isometric adsorbents produced through oxidation using (NH4)2S2O8 and K2Cr2O7 oxidants. K2Cr2O7 synthesized polymers showed better adsorption capacities. The presence of Cr Lewis acid on the surface endorsed phosphate interaction through inner-sphere complex mechanism. The maximum adsorption capacities for K2Cr2O7 synthesized polymers were 143, 217 and 69.0 mg/L for poly(o-phenylenediamine), poly(m-phenylenediamine) and poly(p-phenylenediamine) adsorbents, respectively. The superior performance of poly(m-phenylenediamine) was associated with minimal symmetrical arrangement, hence it was more amorphous as indicated by XRD patterns. Kinetic model fitted pseudo-second-order and isotherm favoured Langmuir. Adsorption process was also controlled by pore diffusion and external mass transfer in the sorbent. Poly(m-phenylenediamine) displayed high affinity in the presence of competing anions and was amenable to recycling.",

keywords = "Phosphates, Regeneration, Poly(phenylenediamine) isomers, Adsorption, Inner-sphere complexing",

author = "Lindani Mdlalose and Mohammed Balogun and Katlego Setshedi and Māris Kļaviņ{\v s} and Luke Chimuka and Avashnee Chetty",

note = "Publisher Copyright: {\textcopyright} 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.",

year = "2022",

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doi = "10.1007/s00289-021-03922-4",

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T1 - Ligand-based poly(phenylenediamine) adsorbents for enhanced removal of phosphate from water

AU - Mdlalose, Lindani

AU - Balogun, Mohammed

AU - Setshedi, Katlego

AU - Kļaviņš, Māris

AU - Chimuka, Luke

AU - Chetty, Avashnee

PY - 2022/10

Y1 - 2022/10

N2 - Phosphorus removal from effluents is vital to avoid eutrophication. The subject study presents the development and performance of poly(phenylenediamine) isometric adsorbents produced through oxidation using (NH4)2S2O8 and K2Cr2O7 oxidants. K2Cr2O7 synthesized polymers showed better adsorption capacities. The presence of Cr Lewis acid on the surface endorsed phosphate interaction through inner-sphere complex mechanism. The maximum adsorption capacities for K2Cr2O7 synthesized polymers were 143, 217 and 69.0 mg/L for poly(o-phenylenediamine), poly(m-phenylenediamine) and poly(p-phenylenediamine) adsorbents, respectively. The superior performance of poly(m-phenylenediamine) was associated with minimal symmetrical arrangement, hence it was more amorphous as indicated by XRD patterns. Kinetic model fitted pseudo-second-order and isotherm favoured Langmuir. Adsorption process was also controlled by pore diffusion and external mass transfer in the sorbent. Poly(m-phenylenediamine) displayed high affinity in the presence of competing anions and was amenable to recycling.

AB - Phosphorus removal from effluents is vital to avoid eutrophication. The subject study presents the development and performance of poly(phenylenediamine) isometric adsorbents produced through oxidation using (NH4)2S2O8 and K2Cr2O7 oxidants. K2Cr2O7 synthesized polymers showed better adsorption capacities. The presence of Cr Lewis acid on the surface endorsed phosphate interaction through inner-sphere complex mechanism. The maximum adsorption capacities for K2Cr2O7 synthesized polymers were 143, 217 and 69.0 mg/L for poly(o-phenylenediamine), poly(m-phenylenediamine) and poly(p-phenylenediamine) adsorbents, respectively. The superior performance of poly(m-phenylenediamine) was associated with minimal symmetrical arrangement, hence it was more amorphous as indicated by XRD patterns. Kinetic model fitted pseudo-second-order and isotherm favoured Langmuir. Adsorption process was also controlled by pore diffusion and external mass transfer in the sorbent. Poly(m-phenylenediamine) displayed high affinity in the presence of competing anions and was amenable to recycling.

KW - Phosphates

KW - Regeneration

KW - Poly(phenylenediamine) isomers

KW - Adsorption

KW - Inner-sphere complexing

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UR - https://www.scopus.com/pages/publications/85117019644

U2 - 10.1007/s00289-021-03922-4

DO - 10.1007/s00289-021-03922-4

M3 - Article

SN - 0170-0839

VL - 79

SP - 8743

EP - 8763

JO - Polymer Bulletin

JF - Polymer Bulletin

IS - 10

ER -

Ligand-based poly(phenylenediamine) adsorbents for enhanced removal of phosphate from water

Abstract

UN SDGs

Keywords

OECD Field of Science

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