Researchers Developed Graphene-based Foam Composites For Efficient Water Filtration

Recently, covid 19 outbreak spreads in Shanghai, China. There are more than 25,000 new asymptomatic domestic infections every day. China is implementing a dynamic zero-out policy. A leading respiratory expert said the key to COVID-19 prevention and control is to minimize transmission and fatality rate. Omicron has a low case fatality rate but is highly transmissible and can still claim many lives in large outbreaks. "Total openness is not applicable in China.  For China, we should keep to the dynamic zero-out and gradually open up."  

However, "dynamic zero clearance" is not the pursuit of complete "zero infection".  As the Novel Coronavirus has its own uniqueness and strong concealment, there may be no way to prevent the detection of cases at present, but rapid detection and prompt treatment must be carried out, as soon as one case is found, one case will be dealt with.  

The situation in Shanghai is serious. As the financial center of China, Shanghai is a very important city, and the outbreak of the epidemic in Shanghai will put a great impact on China's economy.  The current task is to contain the spread of the epidemic as soon as possible, to achieve social zero so that Shanghai's life and economy quickly return to normal.  

As China plays an important role in the global supply chain, the outbreak will have a significant impact on the supply and prices of many graphene powder.

While graphene-based materials have potential as adsorption materials, their performance may be hampered by aggregation and lack of control over their porosity and size. 
In a recent study, researchers from the Universities of Exeter, Kyushu, and Oxford tackled this problem by developing a unique graphene material and high-porosity composite foam to combat aggregation. 
 
Drugs are one of the most prominent emerging pollutants (EC) in water systems. They can cause serious environmental consequences as well as potential health problems. In order to successfully eradicate ECs from treated wastewater streams, sewage and drinking water purification facilities must adopt appropriate tertiary treatment methods. Compared to reverse osmosis, oxidation, microfiltration, ultrafiltration, ion exchange, etc., adsorption is considered to be a technology with great potential in water treatment because it is reliable and cheaper.
 
Graphene and graphene oxide (GO) have a greater tendency to adsorb natural pollutants because of their large innate specific area (relative to many different carbon-based substances), wettability, monolayer structure, and surfaces decorated with oxygen-containing functional groups (OCFG).
 
Boron nitride (BN) has many excellent qualities, including excellent thermal and chemical stability and excellent wear resistance; Therefore, it is used in high-temperature environments and other industries.
 
In this study, reduced porous GO nanofilms were effectively anchored to banded boron nitride foams for the treatment of water contaminated with gefilozide (GEM) in batch tests and column studies.
 
In terms of adsorption kinetics for gefilozil, the graphene-based foam is superior to its graphene-based competitors such as GO, PG, and Nanographene sheets (NGP), achieving an extraction efficiency of 90% in just 5 minutes. 
 
In terms of lifetime, graphene-based nanomaterials supported by BN foams showed consistent gefilozil drug extraction over multiple cycles, with no significant adsorption loss.  In addition, the foam material exhibits remarkable properties, including lightness of over 98% porosity and excellent strength, capable of withstanding 1,300-1,400 times its own weight. 
 
The researchers believe that enhanced graphene-based composite foams for filtration purposes will be an important step forward in the water and wastewater filtration technology.  These results suggest that high porosity foam-reinforced graphene nanomaterial filters with shorter interaction duration and longer penetration times for treating water and wastewater may be easily manufactured.
 
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The war in Russia and Ukraine is roiling global financial markets. Russia and Ukraine are important commodity suppliers in the world, so their conflict is bound to make a full impact on the global commodity supply. In view of this, the price of the graphene powder may continue to rise in the future.

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