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

Ruchi Aggarwal; Deepika Saini; Sumit Sonkar; Amit Kumar Sonker; Gunnar Westman

doi:10.1016/j.chemosphere.2021.132287

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)

Not published at VTT

Research output: Contribution to journal › Article › Scientific › peer-review

33 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 language	English
Article number	132287
Journal	Chemosphere
Volume	287
Issue number	Part 3
DOIs	https://doi.org/10.1016/j.chemosphere.2021.132287
Publication status	Published - Jan 2022
MoE publication type	A1 Journal article-refereed

Keywords

Acid assisted carbonization
Biomass
Heavy metal removal
Photocatalysis

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.chemosphere.2021.132287

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title = "Sunlight promoted removal of toxic hexavalent chromium by cellulose derived photoactive carbon dots",

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.",

keywords = "Acid assisted carbonization, Biomass, Heavy metal removal, Photocatalysis",

author = "Ruchi Aggarwal and Deepika Saini and Sumit Sonkar and Sonker, {Amit Kumar} and Gunnar Westman",

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doi = "10.1016/j.chemosphere.2021.132287",

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T1 - Sunlight promoted removal of toxic hexavalent chromium by cellulose derived photoactive carbon dots

AU - Aggarwal, Ruchi

AU - Saini, Deepika

AU - Sonkar, Sumit

AU - Sonker, Amit Kumar

AU - Westman, Gunnar

PY - 2022/1

Y1 - 2022/1

N2 - 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.

AB - 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.

KW - Acid assisted carbonization

KW - Biomass

KW - Heavy metal removal

KW - Photocatalysis

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U2 - 10.1016/j.chemosphere.2021.132287

DO - 10.1016/j.chemosphere.2021.132287

M3 - Article

SN - 0045-6535

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JO - Chemosphere

JF - Chemosphere

IS - Part 3

M1 - 132287

ER -

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

Abstract

Keywords

UN SDGs

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