Recyclable process modeling study of hexavalent chromium elimination by thiol-based electron donor: Implications for practical applicability

Jerosha Ifthikar, Mengmeng Zhao, Ajmal Shahzad, Irshad Ibran Shahib, Jia Wang, Huabin Wang, Lotfi Sellaoui, Zhuqi Chen, Zhulei Chen

Research output: Journal PublicationArticlepeer-review

7 Citations (Scopus)


Recently, extensive researches implemented to decontaminate hexavalent chromium from industrial effluents. Even though, these processes were not comprehensively addressed in various environmental conditions. This paper investigated the reduction plus adsorption mechanism of [Cr2O7]2-by thiol-based composite in wide range pHs. In this system, firstly the reduction of [Cr2O7]2-to Cr3+occurred and Cr species adsorbed by -SH, -NH2, -OH functional groups in different degrees. The pH 2.0 medium underwent partial reduction of [Cr2O7]2-to Cr3+, besides three-quarter of [Cr2O7]2-were reduced to Cr3+and also Cr species adsorbed onto the composite in pH 3.0 medium. The extremely fast reduction occurred within 5 min, which helped the application in the fixed-bed column while diminished the column's residual time. Interestingly, mild acidic pHs have prompted the composite to a well-expanded structure, which further controlled the hydraulic resistance and column blockage. Inspiringly, the [Cr2O7]2-- composite system can be treated 13 L of 19.87 mg L-1[Cr2O7]2-to the Environmental Protection Agency's (EPA) discharge limit by 2.27 g of composite in pH 3.0 with 383 mL of an eluent. As per the Bohart-Adams model, a liter of a fixed-bed column may effectively capture around 60 g of Cr from industrial effluent in pH 2.0 - 3.0. This collective system is an efficient catalytic cycle technique to treat oxyanions from wastewater where replacing toxic oxidants with environmentally friendly catalytic wastewater treatment processes.

Original languageEnglish
Article number105645
JournalJournal of Environmental Chemical Engineering
Issue number4
Publication statusPublished - Aug 2021


  • Hexavalent chromium
  • Hydraulic resistance
  • Reduction coupled adsorption
  • Residual time

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology


Dive into the research topics of 'Recyclable process modeling study of hexavalent chromium elimination by thiol-based electron donor: Implications for practical applicability'. Together they form a unique fingerprint.

Cite this