Nanostructured chitosan/molecular sieve-4A an emergent material for the synergistic adsorption of radioactive major pollutants cesium and strontium

Nitin Goyal, Peng Gao, Zhe Wang, Shuwen Cheng, Yong Sik Ok, Gang Li, Liying Liu

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A fresh adsorbent nanostructured chitosan/molecular sieve 4A hybrid (NSC@MS-4A) was fabricated for the rapid adsorption of strontium (Sr2+) and cesium (Cs+) ions from aqueous solutions. The as-obtained NSC@MS-4A were thoroughly characterized by XRD, FE-SEM, EDS, BET, XPS and FT-IR. The physio-chemical properties and structural aspects revealed that NSC@MS-4A acquires fine surface area (72 m2/g), porous structure as well as compatible functional groups (–P–O–P and –C–O–C) for the admission of Cs+ and Sr2+ ions. The batch adsorption studies concluded that prepared adsorbent displayed a maximum adsorption of 92–94 % within 40 min. Fast adsorption of Cs+ and Sr2+ was achieved at neutral pH (6–7), ambient temperature (25−30 °C) and slow agitation speed (50−60 rpm) which could propose vast benefits such as little power utilization and uncomplicated operation. Among six types of adsorption isotherms, Freundlich isotherm showed the best fit with R2>0.997. Pseudo-second order made a better agreement as compare to other kinetic models. The thermodynamic coefficients suggested the passage of Cs+ and Sr2+ ions through the liquid solid boundary is exothermic and spontaneous. The NSC@MS-4A displayed excellent regenerability properties over five repetitive adsorption/desorption cycles, which specified that as-obtained NSC@MS-4A is a sustainable as well as efficient adsorbent for practical decontamination of radioactive liquid waste.

Original languageEnglish
Article number122494
JournalJournal of hazardous materials
Volume392
DOIs
Publication statusPublished - 2020 Jun 15

Keywords

  • Adsorption
  • Adsorption mechanism
  • Cesium
  • Molecular sieve 4A
  • Nanochitosan
  • Strontium

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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