1
RUDN University Chemist Creates a Catalyst to Remove Paracetamol from Wastewater

RUDN University Chemist Creates a Catalyst to Remove Paracetamol from Wastewater

A RUDN University chemist has created a catalyst for wastewater treatment that removes paracetamol – one of the most commonly prescribed antipyretics. This medicine is excreted from the body through the kidneys and enters the sewage, where it does not decompose and can pose a threat to people and the environment. The chemist managed to create a catalyst based on silver sulfide, zinc oxide and graphene oxide, thanks to which paracetamol decomposes in light. The work is published in the journal Separation and Purification Technology.

The widespread use of medicinal and hygiene products has become one of the main factors of wastewater pollution. Imperceptible ‘treatment’ with drugs that can enter the human body from insufficiently treated water, pose a serious threat to both human health and the environment. For wastewater treatment, the method of biodegradation is usually used, when the main work is performed by microorganisms. The second option is adsorption, that is, the absorption of harmful substances by filters-adsorbents. But in this case, it is necessary to solve the issue of recycling filters. Ozone oxidation and some other oxidation methods are also used, but they are expensive and require special equipment.

However, many harmful substances are not biodegradable. One of these substances is acetaminophen, better known to consumers as paracetamol or panadol. This is the most common antipyretic and painkiller in the world, which is sold without a prescription in many countries. About 58-68 percent of the paracetamol in the body is released through the kidneys with urine and enters the city sewer system. In European countries, scientists estimate that the concentration of acetaminophen in wastewater that has already been treated can reach 6 micrograms per liter, and in the United States – 10 micrograms per liter. Therefore, the search for effective and affordable ways to remove this substance from wastewater is an urgent task.

RUDN University chemist Raphael Luque and his colleagues created a series of catalysts for photo-oxidation of acetaminophen in an aqueous medium. The catalyst particles were nanospheres of a composite of zinc oxide and silver sulfide, coated on the outside with a layer of graphene oxide – a layer of carbon one atom thick.

Chemists have found that when the catalyst is irradiated in an aqueous medium with visible light, a short-lived and non-toxic superoxide radical is formed from oxygen dissolved in water. It also oxidizes acetaminophen to water, carbon dioxide and nitrogen, which are harmless to the environment. The sample with a 10% molar silver content had the highest activity.

For comparison, researchers under the same experimental conditions tested the catalytic activity of titanium dioxide and zinc oxide nanospheres coated with graphene oxide. They provided photo-oxidation of acetaminophen by 35 percent for titanium dioxide and 47 percent for zinc oxide in 60 minutes. The new catalysts containing silver sulfide were superior in activity. In 60 minutes, 100 percent of the acetaminophen disappeared from the solution.

The work is published in the Separation and Purification Technology.

Student's Scientific Initiatives View all
03 Nov 2017
June 22 - 26, 2017 in Barnaul, Altai State University, took place the Summer Academy of the BRICS Youth Assembly, an international event that brought together representatives of different countries
650
Visiting Professors View all
03 Nov 2017
Michele Pagano is a graduate of the University of Pisa, a leading scientist, the author of more than 200 publications in international journals, and a participant in many international research projects
1162
Similar newsletter View all
30 Dec
Biologists from RUDN University discovered the secret of flaxseed oil with long shelf life

Biologists from RUDN University working together with their colleagues from the Institute of Molecular Biology of the Russian Academy of Sciences and the Institute of Flax studied the genes that determine the fatty acid composition in flaxseed oil and identified polymorphisms in six of them. The team also found out what gene variations could extend the shelf life of flaxseed oil. This data can be used to improve the genetic selection of new flax breeds. The results were published in the BMC Plant Biology journal.

20
30 Dec 2020
RUDN University chemists developed cheap and eco-friendly surfactants

An international team including chemists from RUDN University suggested an economically feasible and environmentally friendly method to synthesize surfactants. The new compounds can become an eco-friendly alternative to traditional chemicals used in oil production, skincare products manufacture, and in the pharmaceutical industry to transport drugs to diseased body tissues.

22
30 Dec 2020
RUDN University Mathematicians Applied 19th Century Ideas To Modern Computerized Algebra Systems

A team of mathematicians from RUDN University added new symbolic integration functionality to the Sage computerized algebra system. The team implemented ideas and methods suggested by the German mathematician Karl Weierstrass in the 1870s.

15
Similar newsletter View all