Succinate-bonded pullulan: An efficient and reusable super-sorbent for cadmium-uptake from spiked high-hardness groundwater

Azhar Abbas; Muhammad Ajaz Hussain; Muhammad Amin; Muhammad Sher; Muhammad Nawaz Tahir; Wolfgang Tremel

doi:10.1016/j.jes.2015.04.013

Succinate-bonded pullulan: An efficient and reusable super-sorbent for cadmium-uptake from spiked high-hardness groundwater

Azhar Abbas, Muhammad Ajaz Hussain^*, Muhammad Amin, Muhammad Sher, Muhammad Nawaz Tahir, Wolfgang Tremel

^*Corresponding author for this work

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

44 Scopus citations

Abstract

Chemically modified pullulan was evaluated for its sorption efficiency and selectivity to remove cadmium (Cd) from spiked high-hardness groundwater (GW). Pullulan esterified with succinic anhydride using dimethylaminopyridine showed a fairly high degree of substitution value as confirmed by ¹H NMR spectroscopy. Pullulan succinate (Pull-Suc) was converted into the sodium salt (Pull-Suc-Na). The effect of contact time (5-200min) and pH (2-8) on Cd-uptake by the sorbent (Pull-Suc-Na) was investigated. The sorbent showed more than 90% Cd-removal in first 15min from distilled water (DW) and GW solution, respectively. Comparison of Pull-Suc-Na with other polysaccharidal sorbents suggested its high efficiency (DW 476.2mg/g and GW 454.5mg/g) and selectivity for the removal of Cd by an ion exchange mechanism, which is further supported by the negative Gibbs free energy values calculated from Langmuir isotherms. A Langmuir isotherm kinetic model provided the best fit for the sorption of Cd using Pull-Suc-Na. The sorbent showed a negligible decrease in Cd-uptake over three regeneration cycles. The thermal stability testing of the sorbents indicated that Pull-Suc-Na (sorbent) is more stable than Pull-Suc.

Original language	English
Pages (from-to)	51-58
Number of pages	8
Journal	Journal of Environmental Sciences
Volume	37
DOIs	https://doi.org/10.1016/j.jes.2015.04.013
State	Published - 1 Nov 2015
Externally published	Yes

Bibliographical note

Funding Information:
A. Abbas gratefully acknowledges the Higher Education Commission, Pakistan , for funding under the scheme “HEC Indigenous 5000 Fellowships” with grant number PIN 074-1392-Ps4-584 . Authors also acknowledge the Hi-Tech “Instruments Labs”, University of Sargodha for provision of analysis and technical assistance. We acknowledge Mr. Muhammad Sarfraz, Research Officer, PCRWR (Pakistan Council of Research in Water Resources), Laboratories, Sargodha, Pakistan for technical assistance and valuable discussions.

Publisher Copyright:
© 2015.

Keywords

Adsorption
Cadmium
Modified pullulan
Succinylation
Thermal stability

ASJC Scopus subject areas

Environmental Engineering
Environmental Chemistry
General Environmental Science

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10.1016/j.jes.2015.04.013

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title = "Succinate-bonded pullulan: An efficient and reusable super-sorbent for cadmium-uptake from spiked high-hardness groundwater",

abstract = "Chemically modified pullulan was evaluated for its sorption efficiency and selectivity to remove cadmium (Cd) from spiked high-hardness groundwater (GW). Pullulan esterified with succinic anhydride using dimethylaminopyridine showed a fairly high degree of substitution value as confirmed by 1H NMR spectroscopy. Pullulan succinate (Pull-Suc) was converted into the sodium salt (Pull-Suc-Na). The effect of contact time (5-200min) and pH (2-8) on Cd-uptake by the sorbent (Pull-Suc-Na) was investigated. The sorbent showed more than 90\% Cd-removal in first 15min from distilled water (DW) and GW solution, respectively. Comparison of Pull-Suc-Na with other polysaccharidal sorbents suggested its high efficiency (DW 476.2mg/g and GW 454.5mg/g) and selectivity for the removal of Cd by an ion exchange mechanism, which is further supported by the negative Gibbs free energy values calculated from Langmuir isotherms. A Langmuir isotherm kinetic model provided the best fit for the sorption of Cd using Pull-Suc-Na. The sorbent showed a negligible decrease in Cd-uptake over three regeneration cycles. The thermal stability testing of the sorbents indicated that Pull-Suc-Na (sorbent) is more stable than Pull-Suc.",

keywords = "Adsorption, Cadmium, Modified pullulan, Succinylation, Thermal stability",

author = "Azhar Abbas and Hussain, \{Muhammad Ajaz\} and Muhammad Amin and Muhammad Sher and Tahir, \{Muhammad Nawaz\} and Wolfgang Tremel",

note = "Funding Information: A. Abbas gratefully acknowledges the Higher Education Commission, Pakistan , for funding under the scheme “HEC Indigenous 5000 Fellowships” with grant number PIN 074-1392-Ps4-584 . Authors also acknowledge the Hi-Tech “Instruments Labs”, University of Sargodha for provision of analysis and technical assistance. We acknowledge Mr. Muhammad Sarfraz, Research Officer, PCRWR (Pakistan Council of Research in Water Resources), Laboratories, Sargodha, Pakistan for technical assistance and valuable discussions. Publisher Copyright: {\textcopyright} 2015.",

year = "2015",

month = nov,

day = "1",

doi = "10.1016/j.jes.2015.04.013",

language = "English",

volume = "37",

pages = "51--58",

journal = "Journal of Environmental Sciences",

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T2 - An efficient and reusable super-sorbent for cadmium-uptake from spiked high-hardness groundwater

AU - Abbas, Azhar

AU - Hussain, Muhammad Ajaz

AU - Amin, Muhammad

AU - Sher, Muhammad

AU - Tahir, Muhammad Nawaz

AU - Tremel, Wolfgang

N1 - Funding Information: A. Abbas gratefully acknowledges the Higher Education Commission, Pakistan , for funding under the scheme “HEC Indigenous 5000 Fellowships” with grant number PIN 074-1392-Ps4-584 . Authors also acknowledge the Hi-Tech “Instruments Labs”, University of Sargodha for provision of analysis and technical assistance. We acknowledge Mr. Muhammad Sarfraz, Research Officer, PCRWR (Pakistan Council of Research in Water Resources), Laboratories, Sargodha, Pakistan for technical assistance and valuable discussions. Publisher Copyright: © 2015.

PY - 2015/11/1

Y1 - 2015/11/1

N2 - Chemically modified pullulan was evaluated for its sorption efficiency and selectivity to remove cadmium (Cd) from spiked high-hardness groundwater (GW). Pullulan esterified with succinic anhydride using dimethylaminopyridine showed a fairly high degree of substitution value as confirmed by 1H NMR spectroscopy. Pullulan succinate (Pull-Suc) was converted into the sodium salt (Pull-Suc-Na). The effect of contact time (5-200min) and pH (2-8) on Cd-uptake by the sorbent (Pull-Suc-Na) was investigated. The sorbent showed more than 90% Cd-removal in first 15min from distilled water (DW) and GW solution, respectively. Comparison of Pull-Suc-Na with other polysaccharidal sorbents suggested its high efficiency (DW 476.2mg/g and GW 454.5mg/g) and selectivity for the removal of Cd by an ion exchange mechanism, which is further supported by the negative Gibbs free energy values calculated from Langmuir isotherms. A Langmuir isotherm kinetic model provided the best fit for the sorption of Cd using Pull-Suc-Na. The sorbent showed a negligible decrease in Cd-uptake over three regeneration cycles. The thermal stability testing of the sorbents indicated that Pull-Suc-Na (sorbent) is more stable than Pull-Suc.

AB - Chemically modified pullulan was evaluated for its sorption efficiency and selectivity to remove cadmium (Cd) from spiked high-hardness groundwater (GW). Pullulan esterified with succinic anhydride using dimethylaminopyridine showed a fairly high degree of substitution value as confirmed by 1H NMR spectroscopy. Pullulan succinate (Pull-Suc) was converted into the sodium salt (Pull-Suc-Na). The effect of contact time (5-200min) and pH (2-8) on Cd-uptake by the sorbent (Pull-Suc-Na) was investigated. The sorbent showed more than 90% Cd-removal in first 15min from distilled water (DW) and GW solution, respectively. Comparison of Pull-Suc-Na with other polysaccharidal sorbents suggested its high efficiency (DW 476.2mg/g and GW 454.5mg/g) and selectivity for the removal of Cd by an ion exchange mechanism, which is further supported by the negative Gibbs free energy values calculated from Langmuir isotherms. A Langmuir isotherm kinetic model provided the best fit for the sorption of Cd using Pull-Suc-Na. The sorbent showed a negligible decrease in Cd-uptake over three regeneration cycles. The thermal stability testing of the sorbents indicated that Pull-Suc-Na (sorbent) is more stable than Pull-Suc.

KW - Adsorption

KW - Cadmium

KW - Modified pullulan

KW - Succinylation

KW - Thermal stability

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DO - 10.1016/j.jes.2015.04.013

M3 - Article

C2 - 26574087

AN - SCOPUS:84946896323

SN - 1001-0742

VL - 37

SP - 51

EP - 58

JO - Journal of Environmental Sciences

JF - Journal of Environmental Sciences

ER -

Succinate-bonded pullulan: An efficient and reusable super-sorbent for cadmium-uptake from spiked high-hardness groundwater

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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