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
Research Management Institute
Further Reports about: chemical precipitation > electroflotation > electrolysis > Green > heavy metals > HeveaMET > ion-exchange > mature rubber leaves > metal laden wastewater > oxidation-reduction > rubber trees
More articles from Life Sciences:
Study details genes that control whether tumors adapt or die when faced with p53 activating drugs
23.05.2013 | University of Colorado Denver
Scientists announce Top 10 New Species
23.05.2013 | Arizona State University
New indicator molecules visualise the activation of auto-aggressive T cells in the body as never before
Biological processes are generally based on events at the molecular and cellular level. To understand what happens in the course of infections, diseases or normal bodily functions, scientists would need to examine individual cells and their activity directly in the tissue.
The development of new microscopes and fluorescent dyes in ...
A fried breakfast food popular in Spain provided the inspiration for the development of doughnut-shaped droplets that may provide scientists with a new approach for studying fundamental issues in physics, mathematics and materials.
The doughnut-shaped droplets, a shape known as toroidal, are formed from two dissimilar liquids using a simple rotating stage and an injection needle. About a millimeter in overall size, the droplets are produced individually, their shapes maintained by a surrounding springy material made of polymers.
Droplets in this toroidal shape made ...
Frauhofer FEP will present a novel roll-to-roll manufacturing process for high-barriers and functional films for flexible displays at the SID DisplayWeek 2013 in Vancouver – the International showcase for the Display Industry.
Displays that are flexible and paper thin at the same time?! What might still seem like science fiction will be a major topic at the SID Display Week 2013 that currently takes place in Vancouver in Canada.
High manufacturing cost and a short lifetime are still a major obstacle on ...
University of Würzburg physicists have succeeded in creating a new type of laser.
Its operation principle is completely different from conventional devices, which opens up the possibility of a significantly reduced energy input requirement. The researchers report their work in the current issue of Nature.
It also emits light the waves of which are in phase with one another: the polariton laser, developed ...
Innsbruck physicists led by Rainer Blatt and Peter Zoller experimentally gained a deep insight into the nature of quantum mechanical phase transitions.
They are the first scientists that simulated the competition between two rival dynamical processes at a novel type of transition between two quantum mechanical orders. They have published the results of their work in the journal Nature Physics.
“When water boils, its molecules are released as vapor. We call this ...
23.05.2013 | Physics and Astronomy
23.05.2013 | Health and Medicine
23.05.2013 | Ecology, The Environment and Conservation
17.05.2013 | Event News
15.05.2013 | Event News
08.05.2013 | Event News