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Volume 3, Issue 2 (Suppl)
Trends in Green chem
ISSN: 2471-9889
Environmental & Green Chemistry 2017
July 24-26, 2017
Page 129
5
th
International Conference on
6
th
International Conference on
July 24-26, 2017 Rome, Italy
Environmental Chemistry and Engineering
Green Chemistry and Technology
&
Greener approach to prepare electrospun antibacterial β-cyclodextrin-based nanofibers for removal of
bacteria fromwater
Sabelo D Mhlanga, Lebea N Nthunya, Monaheng L Masheane
and
Edward N Nxumalo
University of South Africa, South Africa
Statement of the Problem:
Water in Southern Africa is becoming a lot scarcer and the quality can be poor, especially in rural
communities where there is no access to purified tap water. As a result, the impact of water-borne diseases is significant. The
lack of water has resulted into conflicts and protests in some communities. Groundwater from boreholes and wells plays an
important role in water supply, but due to limited hydrological knowledge, these drinking water sources are not always well-
designed and they are prone to contamination. Poor sanitation is another problem; e.g. it is well-known that nearby located
latrines can result in fecal (and thus pathogenic) contamination of open wells and boreholes. The aim of this project was to
develop viable sustainable solutions that involved the integration of nanofibers to a filtration system.
Methodology &Theoretical Orientation:
Electrospun nanofibres containing Ag+/Fe3+ ions were subjected to UV-reduction
in the presence of water vapor created in a unique system under inert atmosphere at temperatures below 100°C to reduce the
ions to zero-valent state, thus avoiding the use of other toxic reducing agents such as ammonia.
Findings:
The average diameter of the β-CD-based nanofibers was 382.12±30.09 nm and that the diameters of Ag and Ag/Fe
NPs were 38.81±8.21 nm and 56.29±12.64 nm, respectively, after reduction. The effect of UV irradiation time on the reduction
of the Ag+ and Fe3+ was studied by measuring the UV–vis absorbance of the reduced NPs. The Ag and Ag/Fe NPs embedded
on the β-CD-based nanofibers exhibited a strong biocidal effect on all of the bacteria strains.
Conclusion & Significance:
The nanofibers were also tested on real water samples and were found to be effective in killing
bacteria in the water.
mhlansd@unisa.ac.zaEfficient and selective palladium-catalyzed telomerization of 1,3-butadiene with carbon dioxide
Sarim Dastgir
1
, Muhammad Sharif
3
, Ralf Jackstell
3
, Badria Al-Shihi
2
and
Matthias Beller
3
1
Hamad Bin Khalifa University, Qatar
2
Sultan Qaboos University,Sultanate of Oman
3
Universität Rostock, Germany
T
he sustainable approaches for the synthesis of value-added fine and bulk chemicals using viable raw materials and feed
stock has been accepted as a collective knowledge by our society. From the aspect of organic syntheses, the development of
chemical reactions, with high atom efficiency is the main targets. In this respect, carbon dioxide is considered as a valuable C1
building block due to its abundance, low toxicity and recyclability. To create essential C-C bonds from CO
2
using traditional
synthetic methodologies, the use of strong carbon nucleophiles is necessary, which also generate stoichiometric amounts of
by-products. In contrast, the catalytic telomerization of 1,3-butadiene with carbon dioxide leads to the unsaturated δ-lactone
(3-ethylidene-6-vinyltetrahydro-2H-pyran-2-one) under mild conditions in a 100% atom-efficient manner. Herein, we report
our finding on improved palladium catalyst systems for the telomerization of 1,3-butadiene with carbon dioxide and also
report the first related reactions with 1,2-butadiene.
sdastgir@hbku.edu.qaTrends in Green chem, 3:2
DOI: 10.21767/2471-9889-C1-003