Related Experiment Video
Updated: Jan 11, 2026
09:50
Electrochemically and Bioelectrochemically Induced Ammonium Recovery
Published on: January 22, 2015
13.1K
Breaking Dilution Limits: Electrocatalytic Ammonia Production from Low-Concentration Nitrate Streams
Ke Wang1, Yan Chen2, Tong Zhao1
1State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150040, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|November 10, 2025
Summary
Electrocatalytic nitrate reduction converts low-concentration nitrate (NO3-) in wastewater to ammonia (NH3). This review details challenges and strategies for efficient ammonia synthesis from dilute nitrate sources.
Area of Science:
- Environmental Chemistry
- Electrocatalysis
- Green Chemistry
Background:
- Nitrate (NO3-) pollution is a global issue, impacting water quality and ecosystems.
- Electrocatalytic nitrate reduction reaction (eNO3-RR) offers a sustainable route to convert nitrate to valuable ammonia (NH3).
- Existing research often overlooks low-concentration nitrate found in polluted waters, limiting practical applications.
Purpose of the Study:
- To systematically review recent advances in electrocatalytic reduction of low-concentration nitrate to ammonia.
- To analyze challenges and summarize strategies for improving eNO3-RR performance under dilute conditions.
- To assess the feasibility of large-scale ammonia recovery from low-concentration nitrate sources.
Main Methods:
- Review of current literature on electrocatalytic nitrate reduction.
- Analysis of reaction mechanisms and influencing factors for eNO3-RR.
- Assessment of scalability, economic viability, and environmental impact of the process.
Main Results:
- Identified key challenges in electrocatalytic reduction of low-concentration nitrate.
- Summarized effective strategies to enhance ammonia yield and selectivity.
- Evaluated the potential for industrial-scale ammonia production from wastewater.
Conclusions:
- Electrocatalytic nitrate reduction is a promising technology for sustainable ammonia production from dilute nitrate sources.
- Further research is needed to optimize catalysts and reactor designs for real-world applications.
- This review provides a roadmap for future advancements in low-concentration nitrate remediation and ammonia recovery.
Related Concept Videos
01:22Inorganic Nitrogen Assimilation
441
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
441
01:30Preparation of Amines: Alkylation of Ammonia and Amines
4.5K
Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
4.5K
01:15Metabolism of Chemolithotrophs
741
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
741
01:20Titration of a Weak Base with a Strong Acid
8.0K
The titration curve of a weak base like ammonia with a strong acid like hydrochloric acid is the mirror image of the titration curve of a weak acid with a strong base.
Using the ICE table and substituting the Kb value, we calculate the initial pH of 50 mL of 0.1 M ammonia to be 11.11. Addition of 25 mL of 0.1 M hydrochloric acid to this solution of ammonia results in a buffer with an equal concentration of ammonia and ammonium ions. The pH of this buffer can be calculated by substituting these...
Using the ICE table and substituting the Kb value, we calculate the initial pH of 50 mL of 0.1 M ammonia to be 11.11. Addition of 25 mL of 0.1 M hydrochloric acid to this solution of ammonia results in a buffer with an equal concentration of ammonia and ammonium ions. The pH of this buffer can be calculated by substituting these...
8.0K
03:21Weak Base Solutions
24.7K
Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
24.7K
01:29Preparation of Amines: Reduction of Oximes and Nitro Compounds
4.6K
Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
4.6K