Related Experiment Video
Updated: Jan 28, 2026
04:35
Preparation of Free-Surface Hyperbolic Water Vortices
Published on: July 28, 2023
3.8K
Catalytic Converters for Water Treatment
Kimberly N Heck1,2, Sergi Garcia-Segura1,3, Paul Westerhoff1,3
1Nanotechnology Enabled Water Treatment (NEWT) Center , 6100 Main Street , Houston , Texas 77005 , United States.
Accounts of Chemical Research
|February 23, 2019
Summary
Heterogeneous catalysts offer a sustainable solution for cleaning toxic water contaminants like chlorinated organics and nitrates. These advanced reduction technologies can be modular for decentralized water treatment, improving access to safe drinking water.
Area of Science:
- Materials Science
- Environmental Science
- Chemistry
Background:
- Growing global population increases demand for fresh water, necessitating improved, sustainable water purification methods, especially for remote areas.
- Heterogeneous catalysts provide an alternative to conventional water treatment, offering faster kinetics and avoiding concentrated waste streams.
- Current water treatment methods like ion exchange and reverse osmosis generate secondary waste, highlighting the need for advanced reduction technologies.
Purpose of the Study:
- To review the development of heterogeneous catalysts for treating toxic water contaminants, focusing on chlorinated organics and nitrates.
- To explore the relationship between catalyst structure, activity, and selectivity in aqueous reactions.
- To discuss the potential of photocatalysis and electrocatalysis for nitrate treatment and the future of modular catalytic water purification systems.
Main Methods:
- Utilized model metal-on-metal nanoparticle catalysts to investigate structure-activity relationships.
- Employed advanced in situ spectroscopic techniques and density functional theory (DFT) calculations to understand catalyst surface structure and reaction mechanisms.
- Reviewed recent advancements in photocatalysis and electrocatalysis for nitrate remediation.
Main Results:
- Demonstrated that catalyst structure significantly impacts activity and selectivity for degrading water contaminants.
- Provided fundamental insights into the surface chemistry governing catalytic water treatment processes.
- Highlighted the potential for heterogeneous catalysts to be designed for specific contaminant removal.
Conclusions:
- Heterogeneous catalysts represent a promising, waste-free technology for addressing water contamination challenges.
- Modular catalytic units offer a scalable solution for decentralized and on-demand water purification.
- Further research and pilot studies are needed to transition these technologies from lab-scale to large-scale implementation for safe drinking water.
Related Concept Videos
01:19Turnover Number and Catalytic Efficiency
21.5K
The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
21.5K
01:07Catalytically Perfect Enzymes
5.1K
The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
Most enzymes...
Most enzymes...
5.1K
02:13Reduction of Alkenes: Catalytic Hydrogenation
14.0K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
14.0K
01:23States of Water
56.8K
Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
56.8K
01:30Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors
2.5K
Angiotensin-converting enzyme (ACE), a vital component of the renin-angiotensin-aldosterone system, is abundant in lung endothelial cells. ACE converts the inactive decapeptide, angiotensin I, into the active octapeptide, angiotensin II. This potent vasoconstrictor narrows blood vessels, increasing resistance to blood flow and elevating blood pressure. Angiotensin II also stimulates aldosterone production, encouraging kidney cells to reabsorb more sodium and water from urine, thereby increasing...
2.5K
01:28Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
5.8K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
5.8K