Bentonite polymer composite for water purification

Gulziya A. Seilkhanova, Ainur N. Imangaliyeva, Yitzhak Mastai, Akmaral B. Rakhym

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A polyethylene glycol (PEG)-bentonite (BT) composite was prepared by direct polymerization of PEG in suspensions of BT. Based on detailed analyses using field-effect scanning electron microscopy, X-ray diffraction, surface area measurements and chemical methods, the obtained product was mainly composed of Ca-BT with a specific surface area of 4.13 m2 g-1. The optimal conditions for adsorption of Pb2+ and Cd2+ ions were found to be a PEG content of 0.1% and a contact time of 60 min. The sorption experiments were performed under various operating variables, including polymer concentration, pH and temperature. For both Pb2+ and Cd2+, the adsorption equilibrium was described by the Freundlich model, which confirmed the presence of a heterogeneous system with irregular filling of the active centres. The maximum sorption capacities of BT-PEG for removal of Pb2+ and Cd2+ were found to be 22 and 18 mg g-1, respectively. The rate constants calculated for the sorption of Pb2+ and Cd2+ were 6.29 and 6.67 g mg-1 min-1, respectively, at 25°C. This study shows that the obtained sorbents based on BT may be used for treatment of waste water and could help resolve environmental protection issues.

Original languageEnglish
Article number60
JournalBulletin of Materials Science
Volume42
Issue number2
DOIs
StatePublished - Apr 2019

Bibliographical note

Publisher Copyright:
© Indian Academy of Sciences.

Funding

This work was supported by a grant from the Ministry of Education and Science of the Republic of Kazakhstan 3444/GF4 ‘Scientific bases development of phosphorus-containing compounds obtained on the basis of technogenic mineral raw materials’.

FundersFunder number
GF4
Ministry of Education and Science of the Republic of Kazakhstan

    Keywords

    • Bentonite clay
    • Cadmium
    • Composite materials
    • Lead
    • Polyethylene glycol
    • Sorption

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