how Cu can be obtained from CuO by using reduction method?
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Abstract
A simple and green hydrothermal process has been developed to produce Cu from CuO using cellulose as a reductant under mild hydrothermal conditions. The results showed that CuO was easily reduced to Cu in the presence of cellulose, and a complete conversion of CuO into Cu was obtained at a temperature of 250 °C with a reaction time of 1.5 h in 0.50 mol/L NaOH. At the same time, cellulose was converted into value-added chemicals, such as lactic acid and acetic acid. A reaction mechanism for the reduction of CuO to Cu with cellulose as a reductant was also proposed.
Therefore, it is highly desirable to develop a new solid oxidant to replace air or oxygen. Recently, we investigated the possibility of reduction of CuO into Cu in the presence of glucose or cellulose under hydrothermal conditions, 20,21 to develop an alternative for replacing the traditional copper smelting methods that are energy-intensive and nonenvironmental. 22 Results 20,21 showed that CuO can be reduced into Cu in the presence of cellulose or glucose under mild conditions. ...
... These results indicated that CuO could also be reduced by other decomposed products of glucose, such as LA. 20 In addition, as shown in Table 1, in the case of adding CuO (Entry 2), the inorganic carbon (IC) in the liquid phase after the reaction was 3.5 times as that without addition of CuO (Entry 1). The IC in Entry 4 (CuO þ NaOH) was 3.8 times as that only adding NaOH (Entry 3). ...
... Also, CO 2 was detected for gaseous samples in the presence of both CuO and NaOH. 20 These results suggest that CuO promoted the oxidation of glucose to CO 2 , particularly for the presence of alkali. The decrease of the percentage of TOC in the liquid samples from 82 to 48% with the increase of CuO from 1 to 4 mmol (see Figure 5) further verified this assumption. ...
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