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Keywords = copper pectate

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13 pages, 2260 KiB  
Article
A Water-Soluble Sodium Pectate Complex with Copper as an Electrochemical Catalyst for Carbon Dioxide Reduction
by Kirill V. Kholin, Mikhail N. Khrizanforov, Vasily M. Babaev, Guliya R. Nizameeva, Salima T. Minzanova, Marsil K. Kadirov and Yulia H. Budnikova
Molecules 2021, 26(18), 5524; https://doi.org/10.3390/molecules26185524 - 11 Sep 2021
Cited by 2 | Viewed by 3058
Abstract
A selective noble-metal-free molecular catalyst has emerged as a fruitful approach in the quest for designing efficient and stable catalytic materials for CO2 reduction. In this work, we report that a sodium pectate complex of copper (PG-NaCu) proved to be highly active [...] Read more.
A selective noble-metal-free molecular catalyst has emerged as a fruitful approach in the quest for designing efficient and stable catalytic materials for CO2 reduction. In this work, we report that a sodium pectate complex of copper (PG-NaCu) proved to be highly active in the electrocatalytic conversion of CO2 to CH4 in water. Stability and selectivity of conversion of CO2 to CH4 as a product at a glassy carbon electrode were discovered. The copper complex PG-NaCu was synthesized and characterized by physicochemical methods. The electrochemical CO2 reduction reaction (CO2RR) proceeds at −1.5 V vs. Ag/AgCl at ~10 mA/cm2 current densities in the presence of the catalyst. The current density decreases by less than 20% within 12 h of electrolysis (the main decrease occurs in the first 3 h of electrolysis in the presence of CO2). This copper pectate complex (PG-NaCu) combines the advantages of heterogeneous and homogeneous catalysts, the stability of heterogeneous solid materials and the performance (high activity and selectivity) of molecular catalysts. Full article
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10 pages, 2233 KiB  
Article
A New Method for Determination of Pectin Content Using Spectrophotometry
by Furong Wang, Chao Du, Junjun Chen, Lisheng Shi and Hailong Li
Polymers 2021, 13(17), 2847; https://doi.org/10.3390/polym13172847 - 25 Aug 2021
Cited by 19 | Viewed by 7422
Abstract
The study aimed at developing a new spectrophotometric method for determining the pectin content. Take commercial pectin as an example, and the method is based on the reaction of copper ions with pectin to produce copper pectate. The spectrophotometer was used to measure [...] Read more.
The study aimed at developing a new spectrophotometric method for determining the pectin content. Take commercial pectin as an example, and the method is based on the reaction of copper ions with pectin to produce copper pectate. The spectrophotometer was used to measure the remaining content of copper ions so as to calculate the pectin content. This method eliminated the weight step and avoided the error associated with it. Effects of reaction time, temperature, and pH on absorbance were also studied. Additionally, the accuracy of this method was verified. It indicated excellent repeatability and accuracy with the relative standard deviation of 2.09%. In addition, three different plant types were used to demonstrate the reliability of the method. To summarize, this method can be widely used for the determination of pectin content in many materials. Full article
(This article belongs to the Section Polymer Analysis and Characterization)
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