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November 13-14, 2017 Paris, France
5
th
International Conference on
PLASMA CHEMISTRY AND
PLASMA PROCESSING
Journal of Biotechnology and Phytochemistry
Volume 1, Issue 2
Plasma Chemistry 2017
Efficient degradation of organic dyestuffs wastewater
by liquid phase plasma synergy with nano-material
photo catalysis
Wanyuan Gui, Guojian Hao, Yongfeng Liang
and
Junpin Lin
University of Science and Technology, China
C
lean water is a prerequisite not only for human life but
also for all life on the planet. But the aquatic ecosystem is
severely affected by industrialization, notably industry dyestuffs
wastewater, due to its unique features, such as composition
complicated, high density and toxicity, and difficult to bio-
chemical degradation. In the past several decades, numerous
efforts based on advanced oxidation processes(AOPs)have been
made to remediation these wastewaters, such as photocatalytic
oxidation, ozone oxidation, wet oxidation, non-thermal plasma
processing. Among those AOPs, non-thermal plasma can
achieve greater output and better efficiency, due to the discharge
processes where a lot of high energy electrons and active radicals
and molecules are generated, which can effectively have degraded
of dissolved organic compound molecules. However, fast and
efficient degradation of organic wastewater in few minutes is still
facing substantial challenges, and it’s the main technical barriers
that impede its commercialization. Here, an innovative method
for rapid degradation of organic wastewater by electrolytic plasma
processing synergy with four photocatalysis of nano-material:
Au@SiO
2
, TiO
2
, NiO, and ZnO with 2g of K
2
S
2
O
8
addition. The
results showed that 50 mg of RhB dyestuffs fully degraded in
less than 10 minutes were observed by UV and fluorescence.
The mechanism behind these effects were investigated in detail,
and it’s mainly attributed to the two reasons: A large number of
free electrons and high-energy active substances were produced
under the environmental of electrolytic plasma processing, as
a result of free radical chain quickly reacts in the system; on
the other hand, sulfate radical (E°=2.7-3.1 EV) with extremely
strong standard electrode potential was introduced into system,
and it can efficient degradation of the vast majority of dissolved
organic matter. In addition, sulfate radical has a wide range of
pH value applicable range: at pH 2.0-7.0, and the sulfate radical
in the water can exist in a relatively stable state; when the pH
is higher than 8.0-10.0, hydroxyl free radicals is formed by the
part of the sulfate radicals reacting with the water; when pH
value of solution is higher than 10 most of the sulfate radical is
transformed to hydroxyl free radicals, and the coexistence or
shift of both radical can greatly enhance the oxidation capacity
of the system. The organic dyestuffs wastewater can be efficiently
degraded by the cooperation of those reactions, which provides a
broad prospect for industrial wastewater treatment.
Biography
Wanyuan Gui received his doctorate in materials science and engineering, form
State Key Laboratory for advanced metals and materials, University of Science
and Technology Beijing, China. His research interest is towards liquid phase
plasma engineering applications, such as surface modification, coating and
wastewater treatment.
guiwanyuan2008@163.comWanyuan Gui et al., J Biot Phyt 2017