Ultrasonic-enhanced synthesis of rubber-based hydrogel for waste water treatment: Kinetic, isotherm and reusability studies

Noor Faeiza Mohd Noor, Siti Fairus M. Yusoff

Research output: Contribution to journalArticle

Abstract

Hydrogel is used as an adsorbent for the removal of dyes and heavy metals in waste water. In this work, different methods of synthesising novel hydrogels from liquid natural rubber (LNR) were investigated. The two different methods were ultrasonic-assisted polymerisation and heating under reflux. Through graft modification, LNR had initially combined with maleic anhydride (MaH) using benzoyl peroxide (BPO) as a radical initiator. After grafting, acrylic acid (AA) was crosslinked onto LNR-g-MaH using N,N-methylenebisacrylamide (MBA) and potassium persulfate (KPS) as a crosslinker and initiator, respectively. The best method between the two different techniques was identified via a five-level-two-factor response surface methodology (RSM). Higher adsorption percentage (93.34%) was observed in the ultrasonic technique. Meanwhile, the effects of adsorbent mass, dye concentration, pH solution and ionic strength were also investigated and results showed that different conditions were found to give different MG dye adsorption rates. The adsorption of MG dyes on hydrogel is dependent on pH and ionic strength solution. This action indicates an ion exchange mechanism. From an isotherm study, it was found that the Freundlich isotherm best fitted the adsorption of MG dyes. Furthermore, the adsorption kinetic data followed the pseudo-second order kinetic model and the reusability of hydrogel was also investigated.

Original languageEnglish
Article number106200
JournalPolymer Testing
Volume81
DOIs
Publication statusPublished - Jan 2020

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Hydrogel
Rubber
Reusability
Water treatment
Hydrogels
Isotherms
Desorption
Wastewater
Coloring Agents
Dyes
Ultrasonics
Adsorption
Kinetics
Maleic Anhydrides
Maleic anhydride
Ionic strength
Adsorbents
Liquids
Benzoyl Peroxide
Benzoyl peroxide

Keywords

  • Adsorption
  • Desorption
  • Malachite green
  • Rubber-based hydrogel
  • Ultrasonic-assisted

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

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title = "Ultrasonic-enhanced synthesis of rubber-based hydrogel for waste water treatment: Kinetic, isotherm and reusability studies",
abstract = "Hydrogel is used as an adsorbent for the removal of dyes and heavy metals in waste water. In this work, different methods of synthesising novel hydrogels from liquid natural rubber (LNR) were investigated. The two different methods were ultrasonic-assisted polymerisation and heating under reflux. Through graft modification, LNR had initially combined with maleic anhydride (MaH) using benzoyl peroxide (BPO) as a radical initiator. After grafting, acrylic acid (AA) was crosslinked onto LNR-g-MaH using N,N-methylenebisacrylamide (MBA) and potassium persulfate (KPS) as a crosslinker and initiator, respectively. The best method between the two different techniques was identified via a five-level-two-factor response surface methodology (RSM). Higher adsorption percentage (93.34{\%}) was observed in the ultrasonic technique. Meanwhile, the effects of adsorbent mass, dye concentration, pH solution and ionic strength were also investigated and results showed that different conditions were found to give different MG dye adsorption rates. The adsorption of MG dyes on hydrogel is dependent on pH and ionic strength solution. This action indicates an ion exchange mechanism. From an isotherm study, it was found that the Freundlich isotherm best fitted the adsorption of MG dyes. Furthermore, the adsorption kinetic data followed the pseudo-second order kinetic model and the reusability of hydrogel was also investigated.",
keywords = "Adsorption, Desorption, Malachite green, Rubber-based hydrogel, Ultrasonic-assisted",
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