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
Closing in on advanced prostate cancer
13.12.2017 | Institute for Research in Biomedicine (IRB Barcelona)
Visualizing single molecules in whole cells with a new spin
13.12.2017 | Wyss Institute for Biologically Inspired Engineering at Harvard
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
13.12.2017 | Health and Medicine
13.12.2017 | Physics and Astronomy
13.12.2017 | Life Sciences