Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Fe-TAML(R) activators developed at Carnegie Mellon help cleanup paper and wood pulp manufacturing

11.09.2003


Potent, environmentally friendly catalysts called Fe-TAML® activators, developed by scientists at Carnegie Mellon University, can destroy colored pollutants and toxic compounds resulting from paper and wood pulp processing.



The results of extensive field trials conducted by Carnegie Mellon University, Forest Research of New Zealand and the University of Auckland are being presented by Dr. L. James Wright of the University of Auckland on Wed., Sept. 10, in New York City at the 226th annual meeting of the American Chemical Society (paper 177, "Activation of hydrogen peroxide with a TAML® catalyst for wastewater remediation in the pulp and paper industry," Industrial & Engineering Chemistry Division).

"Right now, we can use Fe-TAMLs with hydrogen peroxide to clean up the unsightly color from chlorine-based bleaching processes used by mills to make paper and the chlorinated byproducts of those processes, which are considered a potential health hazard," said Terry Collins, the Thomas Lord Professor of Chemistry at Carnegie Mellon and the chief researcher on the Fe-TAML project. Collins describes the results of the decolorization as going from ’coffee’ to ’lemonade.’


Fe-TAMLs (TAML stands for tetra-amido macrocyclic ligand) are synthetic catalysts made with elements found in nature.

While the current study shows that the Fe-TAML activators are extremely promising in cleanup efforts, their real promise may be in replacing altogether chlorine-based bleaching processes currently in place. If accomplished, this substitution would virtually avert the formation of chlorinated byproducts altogether and greatly reduce or eliminate color production associated with paper processing, according to Collins.

The paper and wood pulp manufacturing process produces approximately 100 million tons of bleached pulp each year for use in the manufacture of a variety of cellulose-based products including white paper. In standard mill paper processing, a dark, coffee-colored effluent is produced, called ’color’ in the industry because of its dark hue, which enters streams and rivers. This effluent often contains a dark-colored oxidized form of a polymer derived from lignin, which is a polymer surrounding the cellulose in wood, as well as chlorinated byproducts. The effluent inhibits light from penetrating the water. Reduced light, in turn, can reduce plant growth and affect organisms that depend on those plants for food.

While Fe-TAML activators are not yet optimized to the point where they could replace chlorinated bleaching processes completely, they could be used now by paper and wood pulp mills to significantly reduce color so that brown, opaque wastewater becomes yellow and translucent, according to Collins. The decolorization process also reduces chlorinated byproducts resulting from some wood bleaching processes by nearly 30 percent.

Hydrogen peroxide catalyzed by Fe-TAML activators eventually should provide a much more efficient bleaching process than one using chlorinated compounds, according to Collins, because only small quantities of the Fe-TAML activators and hydrogen peroxide are needed to be highly effective. Furthermore, according to Collins, Fe-TAMLs are likely to be relatively inexpensive catalysts when produced in large amounts.

The field trials on color removal conducted in 2003 were funded by New Zealand resources and by the Eden Hall Foundation in Pittsburgh, Pennsylvania.

Fe-TAML activators originated at Carnegie Mellon’s Institute for Green Oxidation Chemistry under the leadership of Collins, who is a strong proponent of green chemistry to create environmentally friendly, sustainable technologies. Fe-TAML activators show enormous potential to provide clean, safe alternatives to existing industrial practices. They also provide ways to remediate other pressing problems that currently lack solutions.

As part of this September’s American Chemical Society meeting symposium, "Green Chemistry: Multidisciplinary Science and Engineering Applied to Global Environmental Issues," the Collins group will present results of Fe-TAML activators’ effectiveness in killing a simulant of a biological warfare agent, reducing fuel pollutants, cleaning wastewater from textile manufacturing and detoxifying pesticides. At the symposium, the Collins group also will highlight how Fe-TAML activators can work with oxygen rather than hydrogen peroxide, thereby extending tremendously the range of potential applications of these catalysts.

Lauren Ward | EurekAlert!
Further information:
http://www.cmu.edu/

More articles from Ecology, The Environment and Conservation:

nachricht Global threat to primates concerns us all
19.01.2017 | Deutsches Primatenzentrum GmbH - Leibniz-Institut für Primatenforschung

nachricht Reducing household waste with less energy
18.01.2017 | FIZ Karlsruhe – Leibniz-Institut für Informationsinfrastruktur GmbH

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Quantum optical sensor for the first time tested in space – with a laser system from Berlin

For the first time ever, a cloud of ultra-cold atoms has been successfully created in space on board of a sounding rocket. The MAIUS mission demonstrates that quantum optical sensors can be operated even in harsh environments like space – a prerequi-site for finding answers to the most challenging questions of fundamental physics and an important innovation driver for everyday applications.

According to Albert Einstein's Equivalence Principle, all bodies are accelerated at the same rate by the Earth's gravity, regardless of their properties. This...

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Tracking movement of immune cells identifies key first steps in inflammatory arthritis

23.01.2017 | Health and Medicine

Electrocatalysis can advance green transition

23.01.2017 | Physics and Astronomy

New technology for mass-production of complex molded composite components

23.01.2017 | Process Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>