Role of Hydrophobic Interaction in Driving the Partitioning of Metal Ions in a PEG-Based Aqueous Two-Phase System

Pan Sun; Kun Huang; Jieyuan Lin; Huizhou Liu

doi:10.1021/acs.iecr.8b01551

Role of Hydrophobic Interaction in Driving the Partitioning of Metal Ions in a PEG-Based Aqueous Two-Phase System

Pan Sun, Kun Huang, Jieyuan Lin, Huizhou Liu

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

19 Scopus citations

Abstract

PEG-based aqueous two-phase systems (ATPS) for extraction and removal of metal ions from industrial wastewaters is a promising strategy to replace traditional organic-aqueous two phase systems, due to its environmentally friendly advantages and excellent separation efficiency from controllable phase structure and physicochemical properties. However, controversy still remains about the partitioning mechanism of metal ions into the PEG-rich phase in ATPS. The present contribution revealed that a specific hydrophobic interaction was a main driving force for the transferring of Cr(VI) ions into the PEG-rich phase in ATPS. The properties of aqueous media around the PEG molecules and Cr(VI) ions also played a crucial role in the partitioning of Cr(VI) ions in the PEG-base ATPS. The PEG-rich phase in the ATPS exhibited a specific affinity toward poorly hydrated HCrO₄ ^- ions, compared to the strongly hydrated CrO₄ ^2- ions. The difference in the properties of aqueous media in the coexisting liquid phases was response for the partitioning of Cr(VI) ions in the PEG-base ATPS. It was confirmed by combined application of UV-vis spectroscopy and molecular dynamics simulations. The present work provides a new understanding into the microscopic mechanism of the partitioning of metal ions in the polymer-based ATPS.

Original language	English
Pages (from-to)	11390-11398
Number of pages	9
Journal	Industrial and Engineering Chemistry Research
Volume	57
Issue number	33
DOIs	https://doi.org/10.1021/acs.iecr.8b01551
State	Published - Aug 22 2018
Externally published	Yes

Funding

This work was financially supported by the National Natural Science Foundation of China (Nos. 51574213 and 51074150) and the Key Project of Chinese National Programs for Fundamental Research and Development (973 Program No. 2013CB632602). We thank the Supercomputing Centre of Chinese Academy of Sciences for allowing us to use the ScGrid for theoretical calculations.

Funders	Funder number
National Natural Science Foundation of China	51574213, 51074150
National Key Research and Development Program of China	2013CB632602

UN SDGs

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

Access to Document

10.1021/acs.iecr.8b01551

Cite this

@article{4d0ae6f8bedb469083c1d6c6a8e5b582,

title = "Role of Hydrophobic Interaction in Driving the Partitioning of Metal Ions in a PEG-Based Aqueous Two-Phase System",

abstract = "PEG-based aqueous two-phase systems (ATPS) for extraction and removal of metal ions from industrial wastewaters is a promising strategy to replace traditional organic-aqueous two phase systems, due to its environmentally friendly advantages and excellent separation efficiency from controllable phase structure and physicochemical properties. However, controversy still remains about the partitioning mechanism of metal ions into the PEG-rich phase in ATPS. The present contribution revealed that a specific hydrophobic interaction was a main driving force for the transferring of Cr(VI) ions into the PEG-rich phase in ATPS. The properties of aqueous media around the PEG molecules and Cr(VI) ions also played a crucial role in the partitioning of Cr(VI) ions in the PEG-base ATPS. The PEG-rich phase in the ATPS exhibited a specific affinity toward poorly hydrated HCrO4 - ions, compared to the strongly hydrated CrO4 2- ions. The difference in the properties of aqueous media in the coexisting liquid phases was response for the partitioning of Cr(VI) ions in the PEG-base ATPS. It was confirmed by combined application of UV-vis spectroscopy and molecular dynamics simulations. The present work provides a new understanding into the microscopic mechanism of the partitioning of metal ions in the polymer-based ATPS.",

author = "Pan Sun and Kun Huang and Jieyuan Lin and Huizhou Liu",

note = "Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2018",

month = aug,

day = "22",

doi = "10.1021/acs.iecr.8b01551",

language = "English",

volume = "57",

pages = "11390--11398",

journal = "Industrial and Engineering Chemistry Research",

issn = "0888-5885",

publisher = "American Chemical Society",

number = "33",

}

TY - JOUR

T1 - Role of Hydrophobic Interaction in Driving the Partitioning of Metal Ions in a PEG-Based Aqueous Two-Phase System

AU - Sun, Pan

AU - Huang, Kun

AU - Lin, Jieyuan

AU - Liu, Huizhou

PY - 2018/8/22

Y1 - 2018/8/22

N2 - PEG-based aqueous two-phase systems (ATPS) for extraction and removal of metal ions from industrial wastewaters is a promising strategy to replace traditional organic-aqueous two phase systems, due to its environmentally friendly advantages and excellent separation efficiency from controllable phase structure and physicochemical properties. However, controversy still remains about the partitioning mechanism of metal ions into the PEG-rich phase in ATPS. The present contribution revealed that a specific hydrophobic interaction was a main driving force for the transferring of Cr(VI) ions into the PEG-rich phase in ATPS. The properties of aqueous media around the PEG molecules and Cr(VI) ions also played a crucial role in the partitioning of Cr(VI) ions in the PEG-base ATPS. The PEG-rich phase in the ATPS exhibited a specific affinity toward poorly hydrated HCrO4 - ions, compared to the strongly hydrated CrO4 2- ions. The difference in the properties of aqueous media in the coexisting liquid phases was response for the partitioning of Cr(VI) ions in the PEG-base ATPS. It was confirmed by combined application of UV-vis spectroscopy and molecular dynamics simulations. The present work provides a new understanding into the microscopic mechanism of the partitioning of metal ions in the polymer-based ATPS.

AB - PEG-based aqueous two-phase systems (ATPS) for extraction and removal of metal ions from industrial wastewaters is a promising strategy to replace traditional organic-aqueous two phase systems, due to its environmentally friendly advantages and excellent separation efficiency from controllable phase structure and physicochemical properties. However, controversy still remains about the partitioning mechanism of metal ions into the PEG-rich phase in ATPS. The present contribution revealed that a specific hydrophobic interaction was a main driving force for the transferring of Cr(VI) ions into the PEG-rich phase in ATPS. The properties of aqueous media around the PEG molecules and Cr(VI) ions also played a crucial role in the partitioning of Cr(VI) ions in the PEG-base ATPS. The PEG-rich phase in the ATPS exhibited a specific affinity toward poorly hydrated HCrO4 - ions, compared to the strongly hydrated CrO4 2- ions. The difference in the properties of aqueous media in the coexisting liquid phases was response for the partitioning of Cr(VI) ions in the PEG-base ATPS. It was confirmed by combined application of UV-vis spectroscopy and molecular dynamics simulations. The present work provides a new understanding into the microscopic mechanism of the partitioning of metal ions in the polymer-based ATPS.

UR - http://www.scopus.com/inward/record.url?scp=85051145367&partnerID=8YFLogxK

U2 - 10.1021/acs.iecr.8b01551

DO - 10.1021/acs.iecr.8b01551

M3 - Article

AN - SCOPUS:85051145367

SN - 0888-5885

VL - 57

SP - 11390

EP - 11398

JO - Industrial and Engineering Chemistry Research

JF - Industrial and Engineering Chemistry Research

IS - 33

ER -

Role of Hydrophobic Interaction in Driving the Partitioning of Metal Ions in a PEG-Based Aqueous Two-Phase System

Abstract

Funding

UN SDGs

Access to Document

Other files and links

Fingerprint

Cite this