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

被引：35

作者：

Aggarwal, Ruchi ^{[1
]}

Saini, Deepika ^{[1
]}

Sonkar, Sumit Kumar ^{[1
]}

Sonker, Amit Kumar ^{[2
,3
]}

Westman, Gunnar ^{[2
,3
]}

机构：

[1] Malaviya Natl Inst Technol, Dept Chem, Jaipur 302017, Rajasthan, India

[2] Chalmers Univ Technol, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden

[3] Chalmers Univ Technol, Wallenberg Wood Sci Ctr WWSC, S-41296 Gothenburg, Sweden

来源：

CHEMOSPHERE | 2022年 / 287卷

关键词：

Biomass; Acid assisted carbonization; Photocatalysis; Heavy metal removal; ELECTROCHEMICAL SYNTHESIS; CR(VI); NANOCRYSTALS; PHOTOREDUCTION; NANOPARTICLES; FLUORESCENCE; DEGRADATION; REDUCTION; RESONANCE; PRECURSOR;

D O I：

10.1016/j.chemosphere.2021.132287

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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 degrees 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 pseudofirst-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.

引用

页数：9

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