This study produced a biosorbent called HeveaMET obtained from rubber leaf powder, chemically modified with NaOH, to remove Cu(II) and Ni(II) ions from wastewater.
The presence of heavy metals in the environment is of major concern because of their toxicity, bioaccumulation, and threat to human life and environment. The removal of heavy metals from our environment especially wastewater, is shifted from using electrolysis, chemical precipitation, electroflotation, oxidation-reduction, solvent extraction and ion-exchange to the use of biosorbents.
In recent years, many low cost biosorbents obtained from lignocellulosic agricultural by-products have been investigated for their biosorption capacity towards heavy metals. Agricultural wastes are now becoming viable alternatives since they are abundantly available, much cheaper and have various functional groups such as carboxylic acid, ester, carboxylate, hydroxyl, phenolic and amino that can act as adsorption sites for heavy metal ions.
In Malaysia, more than 1.2 million ha of lands are planted with rubber trees and every year, mature rubber leaves (brownish in color) will fall to the ground during the dry season (January to March) producing a huge amount of solid waste. The conversion of this type of plant waste into a low cost heavy metal biosorbent offers a cost effective and green alternative to existing technologies to treat metal laden wastewater.
In this work, the data obtained from column experiment indicated that 10 g of HeveaMET was able to remove 7.1 and 11.1 L of Cu(II) and Ni(II) ions at 10 mg/L concentration, respectively. HeveaMET was able to be regenerated using 0.1 M HCl or HNO3 and reused for three cycles. The main mechanisms involved in heavy metals removal were ion-exchange, complexation and physical adsorption. Due to the high volumes of Cu(II) and Ni(II) that could be treated and the low cost of production (~ RM5/kg), HeveMET ha.Reported by Megawati Omar
Megakaryocytes act as „bouncers“ restraining cell migration in the bone marrow
16.07.2019 | Rudolf-Virchow-Zentrum für Experimentelle Biomedizin der Universität Würzburg
A human liver cell atlas
15.07.2019 | Max Planck Institute of Immunobiology and Epigenetics
Scientists at the University Würzburg and University Hospital of Würzburg found that megakaryocytes act as “bouncers” and thus modulate bone marrow niche properties and cell migration dynamics. The study was published in July in the Journal “Haematologica”.
Hematopoiesis is the process of forming blood cells, which occurs predominantly in the bone marrow. The bone marrow produces all types of blood cells: red...
For some phenomena in quantum many-body physics several competing theories exist. But which of them describes a quantum phenomenon best? A team of researchers from the Technical University of Munich (TUM) and Harvard University in the United States has now successfully deployed artificial neural networks for image analysis of quantum systems.
Is that a dog or a cat? Such a classification is a prime example of machine learning: artificial neural networks can be trained to analyze images by looking...
An international research group led by scientists from the University of Bayreuth has produced a previously unknown material: Rhenium nitride pernitride. Thanks to combining properties that were previously considered incompatible, it looks set to become highly attractive for technological applications. Indeed, it is a super-hard metallic conductor that can withstand extremely high pressures like a diamond. A process now developed in Bayreuth opens up the possibility of producing rhenium nitride pernitride and other technologically interesting materials in sufficiently large quantity for their properties characterisation. The new findings are presented in "Nature Communications".
The possibility of finding a compound that was metallically conductive, super-hard, and ultra-incompressible was long considered unlikely in science. It was...
An interdisciplinary research team at the Technical University of Munich (TUM) has built platinum nanoparticles for catalysis in fuel cells: The new size-optimized catalysts are twice as good as the best process commercially available today.
Fuel cells may well replace batteries as the power source for electric cars. They consume hydrogen, a gas which could be produced for example using surplus...
The fly agaric with its red hat is perhaps the most evocative of the diverse and variously colored mushroom species. Hitherto, the purpose of these colors was...
24.06.2019 | Event News
29.04.2019 | Event News
17.04.2019 | Event News
16.07.2019 | Physics and Astronomy
16.07.2019 | Power and Electrical Engineering
16.07.2019 | Information Technology