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Efficency of Graphene/Magnetite nanocomposite in water treatment

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Mohammed Goda

on 10 September 2014

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Transcript of Efficency of Graphene/Magnetite nanocomposite in water treatment

Outlines
Water treatment
Efficiency of graphene/magnetite nanocomposite for wastewater treatment
Efficiency of graphene/magnetite nanocomposite for wastewater treatment
Characterization Results
Acknowledgments
Vibrating Sample Magnetometer:
Water pollutions
Water pollutions.
Water treatment and graphene in water treatment.
Questions?
Prof.Dr. Ramadan Mahdy El Bahnasawy
Graphene/ magnetite nanocomposite in water treatment.
Adsorption technique:
Experimental work
Graphene in water treatment
High resolution transmission electron microscope (HR-TEM)
Graphene
Water treatment techniques

.

Mohammed Abd El Mawgoud Farghali
Research Assistant Nanotechnology and Advanced Materials Central Lab., Agricultural Research Center.
Co-authors:
Prof.Dr. Ramadan Mahdy El Bahnasawy
Professor of analytical and inorganic chemistry, Department of Chemistry, Faculty of Science, Menofiya University.
Dr. Taher Ahmed Salah El-Dein
The Director of Nanotechnology and Advanced Materials Central Lab., Agricultural Research Center.
Introduction:
Experimental work:
Synthesis of graphene/Fe3O4 nanocomposite.
Determination of adsorption capacity of graphene/Fe3O4 nanocomposite for Mthylene blue (MB) removal.
Results:
Without water, no life could exist on the earth.
water covers 70 percent of the earth’s surface.
According to the latest report of the World Health Organization/2012 Update”)
in developing countries about
3.3

million
people die from water-related health problems each year and
46%
of people on earth do not have water piped to their homes.
Nowadays, of a worldwide population of roughly
6.8

billion
, approximately
one third
is living in countries considered in water emergency. If this trend continues till
2025
, two third of people worldwide will be living in regions with water scarcity.
It is well known that an increase in population and consumption of fossil fuels have led to increased pollution worldwide
pollutants that are removed during water treatment:
Total Dissolved Solids.
Total Suspended Solids
Biological contaminants
pesticides
Radioactive wastes
Heavy metals.
dyes and organic contaminants.
Water treatment should
reduce
or
remove
entirely all contaminants present in the water to
acceptable
levels for a desired end-use
Various methods are used to remove and dyes wastes including:
Biological treatment
Ozone treatment
Chemical oxidation
Precipitation
Ion exchange
Photocatalytic degradation
Evaporation
Adsorption process

Adsorption
is recognized as the
preferred
method for
removal
,
recovery
and
recycling
of
toxic
pollutants from waste water.
attractive due to its
low cost
,
simplicity
of
design
,
ease of operation
,
effectiveness
and
economy
.
Many kinds of sorbents
such as activated carbon, mesoporous materials, clay, zeolite, chitosan, apatite, polymers and
graphene.
Graphene
is a
one-atom-thick planar sheet
of carbon atoms that are densely packed in a honeycomb crystal lattice.
Graphite
itself consists of many graphene sheets
stacked
together.
It has large specific surface area, so it can be used in water treatment.
It was well known that magnetic separation provides a rapid and effective way for removing and recycling magnetic particles by applying an appropriate external magnet.

Magnetite (Fe3O4) NPs have promising applications in magnetic separation, Additionally, Fe3O4 NPs also show advantages such as low toxicity, low cost, and eco-friendliness.
Graphene magnetite nanocomposite in water treatment.
Thus, the
combination
of
graphene
with
magnetic NPs
to produce a
magnetic/ graphene nanocomposite
would provide a new
functional
with
complementary
behavior between each constituent, and thus will have great
advantages
for
water treatment
applications.
Graphene oxide was prepared from expanded graphite according to a
modified Hummers method
.

Preparation of graphene oxide (GO)
Preparation of graphene/ magnetite nanocomposite by solvothermal method
Determination of sorbent capacity of graphene/Fe3O4 nanocomposite for MB removal.
Effect of contact time
Effect of initial MB concentration
Effect of adsorbent dosage
Effect of pH
Effect of temperature
Factors affecting on MB adsorption
X – Ray Diffraction (XRD)
X-ray photoelectron spectroscopy (XPS spectra)
Zeta potential measurements
Adsorption Results
Effect of contact time
Effect of initial MB concentration
Effect of pH
Effect of adsorbent mass
Effect of temperature
Distribution of water on earth
TSS can enter groundwater through runoff from industrial, urban or agricultural areas.
TDS measure the solids remaining in a water sample filtered through a
1.2
micro meter filter. commonly calcium, magnesium, sodium, potassium, carbonate, bicarbonate, chloride, sulfate and silica, which affects the taste and odor of water and in general, levels above 300 mg/L become noticeable to consumers
Inorganic contamination is a significant hazard to water.Metallic ions such as chromium (Cr), lead (Pb), and arsenic (As) are significant threats to the environment as well as human health.
Dyes with
intense
color and high
toxicity discharged from industries
such as dye synthesis, electroplating, leather, paper, printing, cosmetic and textile.
Trace dyes
in water may cause
human
health problems, such as, allergic dermatitis or eye and skin irritation, and may be
carcinogenic.
Methylene blue (MB)
is a heterocyclic
aromatic
chemical compound with the molecular formula
C16H18N3SCl.
a
cationic
dye with maximum absorption of light around
665
nm.
used substance for dying of
cotton
,
wood
, and
silk
.
MB can cause some
harmful
effects such as shock, vomiting, Hypertension, increased heart rate, diarrhea, Anemia, Abdominal pain and tissue necrosis on
human
beings.
Graphene has been used as the sorbent in water treatment because of its ultrahigh specific surface area, high chemical stability and excellent thermal stability.
However, the application is often limited due to the difficulty in removing the suspended graphene from water after the adsorption process.
Acknowledgments:
Professor of analytical and inorganic chemistry, Department of Chemistry, Faculty of Science, Menofiya University.
Dr. Taher Ahmed Salah El-Dein
The Director of Nanotechnology and Advanced Materials Central Lab., Agricultural Research Center.
My Supervisors
My Teamwork
Characterization result of graphene/magnetite nanocomposite.
adsorption capacity result of graphene/magnetite nanocomposite.
Bacteria
Virus
Molds
Algae
Fungi
because they are sprayed in agricultural fields. Pesticide residues have been found in rain and groundwater.
presence of radioactive substances on surfaces or within solids, liquids or gases which emit harmful ionising radiation such as alpha particles or beta particles, gamma rays or neutrons.
such as Nuclear explosion
Adsorption work
qe = (Co–Ce )V/M
Full transcript