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<p>Cassava starch mixed with polyethylene oxide (PEO) and polyvinyl alcohol (PVA) was irradiated under the Co-60 source to produce crosslinked starch-based hydrogels for removing phenol red (PR) from aqueous solutions. The hydrogels were formed by gamma irradiation even at low radiation dose. The gel fraction, namely the crosslinking density, quickly increased with radiation dose to 10&#xa0;kGy, then gradually rose to a maximum of approximately 65% while the swelling degree decreased with the increase of gel fraction. The hydrogel obtained by gamma irradiation at 5&#xa0;kGy was chosen as an absorbent for removing PR from wastewater of textile industry. Experimental results revealed that the maximum adsorption capacity of the hydrogel for PR reached up to 1.55&#xa0;μmol/g (550&#xa0;μg/g) in an alkaline solution (pH = 9). The adsorption of PR onto the starch-based crosslinked hydrogel was a spontaneous and exothermic process, which followed the Langmuir isotherm and the pseudo-second-order kinetic.</p>

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Radiation crosslinking of cassava starch to use as an absorbents for removal of phenol red from wastewater

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • Minh Quynh Tran,
  • Ba Tan Tran,
  • Manh Thang Tran,
  • Duc Nhan Dang

摘要

Cassava starch mixed with polyethylene oxide (PEO) and polyvinyl alcohol (PVA) was irradiated under the Co-60 source to produce crosslinked starch-based hydrogels for removing phenol red (PR) from aqueous solutions. The hydrogels were formed by gamma irradiation even at low radiation dose. The gel fraction, namely the crosslinking density, quickly increased with radiation dose to 10 kGy, then gradually rose to a maximum of approximately 65% while the swelling degree decreased with the increase of gel fraction. The hydrogel obtained by gamma irradiation at 5 kGy was chosen as an absorbent for removing PR from wastewater of textile industry. Experimental results revealed that the maximum adsorption capacity of the hydrogel for PR reached up to 1.55 μmol/g (550 μg/g) in an alkaline solution (pH = 9). The adsorption of PR onto the starch-based crosslinked hydrogel was a spontaneous and exothermic process, which followed the Langmuir isotherm and the pseudo-second-order kinetic.