Copper confined in vesicle-like BCN cavity promotes electrochemical reduction of nitrate to ammonia in water

2021 ◽  
Author(s):  
Xue Zhao ◽  
Guangzhi Hu ◽  
Fang Tan ◽  
Shusheng Zhang ◽  
Xinzhong Wang ◽  
...  
Keyword(s):  
Environmental Pollution ◽  
Electrochemical Reduction ◽  
Value Added ◽  
Electrochemical Methods ◽  
High Concentration ◽  
Bosch Process

Electrochemical methods to convert high-concentration nitrates present in sewage into high-value-added ammonia do not just alleviate the problem of environmental pollution but provide less energy-intensive alternatives to the Haber–Bosch process....

Electroreduction of nitrogen to ammonia on nanoporous gold

Nanoscale ◽  
2021 ◽  
Author(s):  
Haibin Ma ◽  
Zhiwen Chen ◽  
Zhili Wang
Keyword(s):  
Electrochemical Reduction ◽  
Nanoporous Gold ◽  
Reduction Processes ◽  
Bosch Process

Electrochemical reduction of nitrogen (N2) to ammonia (NH3) has attracted attention as an emerging alternative to the traditional Haber-Bosch process to synthesize NH3. Unfortunately, currently electrocatalytic N2 reduction processes are...

scholarly journals Extraction of sugarcane bagasse arabinoxylan, integrated with enzymatic production of xylo-oligosaccharides and separation of cellulose

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Leila Khaleghipour ◽  
Javier A. Linares-Pastén ◽  
Hamid Rashedi ◽  
Seyed Omid Ranaei Siadat ◽  
Andrius Jasilionis ◽  
...  
Keyword(s):  
Sugarcane Bagasse ◽  
Sugar Content ◽  
Value Added ◽  
Apparent Molecular Weight ◽  
Bacillus Halodurans ◽  
Glycoside Hydrolase Family ◽  
High Concentration ◽  
Enzymatic Production ◽  
Successful Separation ◽  
Ft Ir

AbstractSugarcane processing roughly generates 54 million tonnes sugarcane bagasse (SCB)/year, making SCB an important material for upgrading to value-added molecules. In this study, an integrated scheme was developed for separating xylan, lignin and cellulose, followed by production of xylo-oligosaccharides (XOS) from SCB. Xylan extraction conditions were screened in: (1) single extractions in NaOH (0.25, 0.5, or 1 M), 121 °C (1 bar), 30 and 60 min; (2) 3 × repeated extraction cycles in NaOH (1 or 2 M), 121 °C (1 bar), 30 and 60 min or (3) pressurized liquid extractions (PLE), 100 bar, at low alkalinity (0–0.1 M NaOH) in the time and temperature range 10–30 min and 50–150 °C. Higher concentration of alkali (2 M NaOH) increased the xylan yield and resulted in higher apparent molecular weight of the xylan polymer (212 kDa using 1 and 2 M NaOH, vs 47 kDa using 0.5 M NaOH), but decreased the substituent sugar content. Repeated extraction at 2 M NaOH, 121 °C, 60 min solubilized both xylan (85.6% of the SCB xylan), and lignin (84.1% of the lignin), and left cellulose of high purity (95.8%) in the residuals. Solubilized xylan was separated from lignin by precipitation, and a polymer with β-1,4-linked xylose backbone substituted by arabinose and glucuronic acids was confirmed by FT-IR and monosaccharide analysis. XOS yield in subsequent hydrolysis by endo-xylanases (from glycoside hydrolase family 10 or 11) was dependent on extraction conditions, and was highest using xylan extracted by 0.5 M NaOH, (42.3%, using Xyn10A from Bacillus halodurans), with xylobiose and xylotriose as main products. The present study shows successful separation of SCB xylan, lignin, and cellulose. High concentration of alkali, resulted in xylan with lower degree of substitution (especially reduced arabinosylation), while high pressure (using PLE), released more lignin than xylan. Enzymatic hydrolysis was more efficient using xylan extracted at lower alkaline strength and less efficient using xylan obtained by PLE and 2 M NaOH, which may be a consequence of polymer aggregation, via remaining lignin interactions.

An overview of flow cell architectures design and optimization for electrochemical CO2 reduction

2021 ◽  
Author(s):  
Dui Ma ◽  
Ting Jin ◽  
Keyu Xie ◽  
Haitao Huang
Keyword(s):  
Carbon Dioxide ◽  
Global Warming ◽  
Electrochemical Reduction ◽  
Atmospheric Carbon Dioxide ◽  
Co2 Reduction ◽  
Value Added ◽  
Flow Cell ◽  
Design And Optimization ◽  
Electrochemical Co2 Reduction ◽  
Carbon Dioxide Levels

Converting CO2 into value-added fuels or chemical feedstocks through electrochemical reduction is one of the several promising avenues to reduce atmospheric carbon dioxide levels and alleviate global warming. This approach...

Zn nanosheets coated with a ZnS subnanometer layer for effective and durable CO2 reduction

2019 ◽  
Vol 7 (4) ◽  
pp. 1418-1423 ◽  
Author(s):  
Chenglong Li ◽  
Gurong Shen ◽  
Rui Zhang ◽  
Deyao Wu ◽  
Chengqin Zou ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Co2 Reduction ◽  
Value Added ◽  
Environmental Crisis

Electrochemical reduction of CO2 into value-added chemicals provides a facile solution to energy and environmental crisis.

scholarly journals Extraction of Value-Added Minerals from Various Agricultural, Industrial and Domestic Wastes

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6333
Author(s):  
Virendra Kumar Yadav ◽  
Krishna Kumar Yadav ◽  
Vineet Tirth ◽  
Govindhan Gnanamoorthy ◽  
Nitin Gupta ◽  
...  
Keyword(s):  
Environmental Pollution ◽  
Industrial Waste ◽  
Raw Materials ◽  
Agricultural Waste ◽  
Value Added ◽  
Cost Effective ◽  
Household Waste ◽  
Waste Materials ◽  
Materials Synthesis ◽  
Coconut Shells

Environmental pollution is one of the major concerns throughout the world. The rise of industrialization has increased the generation of waste materials, causing environmental degradation and threat to the health of living beings. To overcome this problem and effectively handle waste materials, proper management skills are required. Waste as a whole is not only waste, but it also holds various valuable materials that can be used again. Such useful materials or elements need to be segregated and recovered using sustainable recovery methods. Agricultural waste, industrial waste, and household waste have the potential to generate different value-added products. More specifically, the industrial waste like fly ash, gypsum waste, and red mud can be used for the recovery of alumina, silica, and zeolites. While agricultural waste like rice husks, sugarcane bagasse, and coconut shells can be used for recovery of silica, calcium, and carbon materials. In addition, domestic waste like incense stick ash and eggshell waste that is rich in calcium can be used for the recovery of calcium-related products. In agricultural, industrial, and domestic sectors, several raw materials are used; therefore, it is of high economic interest to recover valuable minerals and to process them and convert them into merchandisable products. This will not only decrease environmental pollution, it will also provide an environmentally friendly and cost-effective approach for materials synthesis. These value-added materials can be used for medicine, cosmetics, electronics, catalysis, and environmental cleanup.

Salen ligand complexes as electrocatalysts for direct electrochemical reduction of gaseous carbon dioxide to value added products

RSC Advances ◽  
2015 ◽  
Vol 5 (5) ◽  
pp. 3581-3589 ◽  
Author(s):  
Surya Singh ◽  
Bedika Phukan ◽  
Chandan Mukherjee ◽  
Anil Verma
Keyword(s):  
Carbon Dioxide ◽  
Electrochemical Reduction ◽  
Value Added ◽  
Salen Complexes ◽  
Gaseous Carbon Dioxide ◽  
Salen Ligand ◽  
Centrosymmetric Molecule ◽  
Value Added Products

CO2, being a linear and centrosymmetric molecule, is very stable, and the electrochemical reduction of CO2 requires energy. However, the salen complexes are found to be very efficient to minimize overpotential as compared to their metal counterparts.

Interaction between Binuclear Copper(I) Complexes and the Dioxygen Molecule Investigated by Electrochemical Methods

1992 ◽  
Vol 47 (1) ◽  
pp. 109-114 ◽  
Author(s):  
Yuzo Nishida ◽  
Izumi Watanabe ◽  
Kei Unoura
Keyword(s):  
Cyclic Voltammetry ◽  
Thin Layer ◽  
Electrochemical Reduction ◽  
High Reactivity ◽  
Electrochemical Methods ◽  
Tridentate Ligand ◽  
Cyclic Voltammograms ◽  
Binuclear Copper ◽  
Alkyl Chains ◽  
Binucleating Ligands

The cyclic voltammograms of some binuclear copper(II) compounds with binucleating ligands where two molecules of tridentate ligand, N, N -bis(benzimidazol-2-ylmethyl)amine are linked by several alkyl chains, were measured under both argon and dioxygen. The results demonstrate that the binuclear copper(I) species produced by electrochemical reduction exhibit high reactivity towards dioxygen, while the reaction of the corresponding mononuclear species with oxygen is very slow. Thin-layer coulometry ([binuclear copper(I)]/[O2] = 0.47 - 10.6) and thin-layer cyclic voltammetry ([binuclear copper(I)]/[O2] = 4.3 - 10.6 ) revealed that two molecules of the binuclear copper(I) species react with one molecule of dioxygen.

scholarly journals Positional effects of second-sphere amide pendants on electrochemical CO2 reduction catalyzed by iron porphyrins

2018 ◽  
Vol 9 (11) ◽  
pp. 2952-2960 ◽  
Author(s):  
Eva M. Nichols ◽  
Jeffrey S. Derrick ◽  
Sepand K. Nistanaki ◽  
Peter T. Smith ◽  
Christopher J. Chang
Keyword(s):  
Carbon Dioxide ◽  
Greenhouse Gas ◽  
Electrochemical Reduction ◽  
Energy Input ◽  
Sustainable Energy ◽  
Co2 Reduction ◽  
Value Added ◽  
Iron Porphyrins ◽  
Electrochemical Co2 Reduction ◽  
Positional Effects

The development of catalysts for electrochemical reduction of carbon dioxide offers an attractive approach to transforming this greenhouse gas into value-added carbon products with sustainable energy input.

Efficient Electrochemical Reduction of High Concentration Nitrate by a Stepwise Method

2019 ◽  
Vol 149 (5) ◽  
pp. 1216-1223
Author(s):  
Lian-Kui Wu ◽  
Yi-Jie Shi ◽  
Cheng Su ◽  
Hua-Zhen Cao ◽  
Guo-Qu Zheng
Keyword(s):  
Electrochemical Reduction ◽  
High Concentration ◽  
Stepwise Method

scholarly journals A Disquisition on the Active Sites of Heterogeneous Catalysts for Electrochemical Reduction of CO 2 to Value‐Added Chemicals and Fuel

2020 ◽  
Vol 10 (11) ◽  
pp. 1902106 ◽  
Author(s):  
Rahman Daiyan ◽  
Wibawa Hendra Saputera ◽  
Hassan Masood ◽  
Josh Leverett ◽  
Xunyu Lu ◽  
...  
Keyword(s):  
Electrochemical Reduction ◽  
Active Sites ◽  
Heterogeneous Catalysts ◽  
Value Added
Sign in / Sign up

Export Citation Format

Share Document