Direct reduction of copper oxide into copper under hydrothermal conditions

Abstract

A new preparation method of Cu from CuO under hydrothermal conditions was investigated. Glucose was employed as reducing agent. Results showed that CuO can be reduced easily to Cu°with glucose as reductant at 220-250°C with NaOH. The reaction conditions such as reaction time, reaction temperature, sodium hydroxide concentration and water filling played key roles in the purity of the products. The proposed method provides an efficient and green conversion of CuO into Cu°without an expensive and toxic reducing agent at low temperatures.

Selective conversion of glucose into lactic acid and acetic acid with copper oxide under hydrothermal conditions

“…That is, there was no loss of copper in the solution, and almost 100% copper as solid can be obtained. Our previous reports have showed that completely reduced Cu from CuO can be available after 1.5 h with glucose or cellulose at 250°C. In this study, the conversion of glucose was above 99% after 1 min in the batch reactor, whereas a large proportion of CuO was not reduced at the same reaction condition according to XRD result (Figure ).…”

“…Recently, we investigated the possibility of reduction of CuO into Cu in the presence of glucose or cellulose under hydrothermal conditions, to develop an alternative for replacing the traditional copper smelting methods that are energy‐intensive and nonenvironmental . Results showed that CuO can be reduced into Cu in the presence of cellulose or glucose under mild conditions. These facts suggested us a new way to enhance the production of carboxylic acids from carbohydrates with metal oxide as an oxidant.…”

Production of Acrylic Acid from Biomass-Derived Fumaric Acid under Hydrothermal Conditions

“…If the fermentation broth can be used directly to produce acrylic acid, it will reduce the high operational costs. However, not only can glucose in the fermentation broth react with CuO to produce complex carboxylic acids, but carboxylic acids can also react with CuO [24,25]. Therefore, fairly high-purity fumaric acid is used in this study.…”

Hydrothermal synthesis of bacterial cellulose–copper oxide nanocomposites and evaluation of their antimicrobial activity

“…copper alloys have also shown bactericidal activity against Salmonella enterica and Campylobacter jejuni (Zhu, Elguindi, Rensing, & Ravishankar, 2012). Under sizes down nanometric range, copper particles display excellent antibacterial and catalytic activity, distinguished optical and magnetic properties than its bulk counterpart or similar sized gold, silver or palladium nanoparticles (Umer, Naveed, Ramzan, Rafique, Imran, 2014;Yao, Huo & Jin, 2011).…”