Sunlight promoted removal of toxic hexavalent chromium by cellulose derived photoactive carbon dots

Ruchi Aggarwal, Deepika Saini, Sumit Sonkar, Amit Kumar Sonker (Corresponding Author), Gunnar Westman (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

31 Citations (Scopus)

Abstract

A scalable synthetic procedure for fabricating photoactive carbon dots (CD) from microcrystalline cellulose (MCC) is presented. The MCC was transformed into a photoactive nanosized CD by a one-step acid-assisted thermal-carbonization (~90 °C for 30 min). The efficiency of the obtained CD was determined by photo-removal of toxic hexavalent chromium (Cr(VI)) ions from wastewater. CD obtained from cellulose completely removed 20 ppm of Cr(VI) wastewater within ∼120 min under sunlight illumination. No Cr(VI) removal was observed in dark conditions and with control cellulose material as reference samples. The Cr(VI) removal follows pseudo-first-order kinetics along with a half-life of ∼26 min. Furthermore, the Cr(VI) removal from wastewater was supported via cyclic voltammetry analysis. Using a low-cost, naturally available cellulose material and sulfuric acid, the world's most-used chemical, creates techno-economic prerequisites for a scalable process of photoactive carbon dots.

Original languageEnglish
Article number132287
JournalChemosphere
Volume287
Issue numberPart 3
DOIs
Publication statusPublished - Jan 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Acid assisted carbonization
  • Biomass
  • Heavy metal removal
  • Photocatalysis

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