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Sunlight promoted removal of toxic hexavalent chromium by cellulose derived photoactive carbon dots
Chemosphere ( IF 8.8 ) Pub Date : 2021-09-17 , DOI: 10.1016/j.chemosphere.2021.132287
Ruchi Aggarwal 1 , Deepika Saini 1 , Sumit Kumar Sonkar 1 , Amit Kumar Sonker 2 , Gunnar Westman 2
Affiliation  

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.



中文翻译:

阳光促进纤维素衍生的光活性碳点去除有毒六价铬

提出了一种用于从微晶纤维素 (MCC) 制造光活性碳点 (CD) 的可扩展合成程序。MCC通过一步酸辅助热碳化(~90°C,30分钟)转化为光活性纳米尺寸的CD。通过光去除废水中的有毒六价铬 (Cr(VI)) 离子来确定获得的 CD 的效率。在阳光照射下,从纤维素获得的 CD 在约 120 分钟内完全去除了 20 ppm 的 Cr(VI) 废水。在黑暗条件下并使用对照纤维素材料作为参考样品,未观察到 Cr(VI) 去除。Cr(VI) 的去除遵循伪一级动力学,半衰期约为 26 分钟。此外,通过循环伏安法分析支持从废水中去除 Cr(VI)。使用低成本,

更新日期:2021-09-23
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