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Use of spent coffee ground as a reducing agent for enhanced reduction of chromate by freezing process

机译：使用废咖啡研磨作为还原剂，通过冷冻过程提高铬酸盐的减少

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In this study, the freezing-mediated reduction of chromate (Cr(VI)) was investigated using spent coffee ground (SCG) as a reducing agent. The results obtained showed that the rate of Cr(VI) reduction using SCG was dramatically enhanced in the frozen phase (-20 degrees C) compared with the aqueous phase (25 degrees C), and after 3 h of reaction, the residual Cr(VI) concentration in the aqueous phase was 15.25 +/- 0.58 mu M, while that in the frozen phase was only 1.89 +/- 0.16 mu M (initial experimental conditions: [Cr(VI)](i) = 20 mu M, [SCG](i) = 0.1 g/L, and pH(i) = 3.0). Additionally, based on the results obtained under different experimental conditions, the accelerated reduction of Cr(VI) using SCG in the frozen solution could be attributed to the freeze concentration phenomenon, which is associated with the accumulation of Cr(VI) and protons, as well as the phenolic compounds in SCG extracts. (C) 2021 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering
机译：本研究以废咖啡渣（SCG）为还原剂，研究了冷冻介导的铬酸盐（Cr（VI））还原。结果表明，与水相（25℃）相比，冷冻相（-20℃）中使用SCG还原Cr（VI）的速度显著提高，反应3小时后，水相中残余Cr（VI）浓度为15.25+/-0.58μM，而在冷冻阶段只有1.89+/-0.16μM（初始实验条件：[Cr（VI）]（i）=20μM，[SCG]（i）=0.1 g/L，pH（i）=3.0）。此外，根据在不同实验条件下获得的结果，使用SCG在冷冻溶液中加速还原Cr（VI）可归因于冷冻浓缩现象，这与Cr（VI）和质子以及SCG提取物中酚类化合物的积累有关。（c）2021由爱思唯尔B.V出版，代表韩国工业和工程学会

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