Submitted by-
Priyanka Takhar
Prashant Gautam
Vaibhav Gehlot
2010CEV2926
2014CEV2925
2010CH70189

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
High demand of water due to increase in population

High amount of wastewater is generated

The wastewater contains micro-organisms, organics, metals and toxicants

Metals (copper here) are highly carcinogenic

Metals cannot be decomposed or bio-degraded
 They have to be removed during treatment

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
Precipitation

Flotation

Ion Exchange

Electrocoagulation

Adsorption
Adsorption is widely used for the removal of metals because of its simplicity and effective cost

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The most common adsorbent (nowadays) are nanoparticles

Nanoparticles are particles with size less than 100nm

The advantages of using nanoparticles as adsorbent are-

High surface area in low volume
 Magnetic characteristics

Low cost
 Effective contaminant removal even at low concentrations
 Less waste generation post-treatment

Table 3: Comparison between different nano particles
Source
Palanisamy et al., 2013
Nano particle
Magnetic iron oxide stabilized by Olive Oil pH
2.5
2.5
Kana et al., 2013
Liu et al., 2008
Sukopová et al., 2013
Predescu et.al., 2012
Magnetic iron oxide stabilized by MIONs
Flaxseed Oil
Chitosan Nano-Particles
Fe
3
O
4
Magnetic
Nanoparticles With Humic
Acid
Zerovalent Iron
Nanoparticles
Maghemite Nanoparticles
-
6.4
9.2
2.5
Time taken
(min)
60
60
30
15
4380
120
Removal
(%)
95.5
91.6
99
81
100
99.7

Bhargav et al., 2013
Xin et al., 2012
Iron (III) Oxide
Nanoparticle
Amine-functionalized mesoporous Fe
3
O
4 nanoparticles
Rafiq et al., 2014
Pang et al., 2011
Zinc oxide nanoadsorbents
Magnesium oxide nano-adsorbents
Magnetic
Nanoparticle
5
3
5.5
8
7
90
90
30
1710
120
100
98
97.6
98.21
98

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Corrosion of metal surface

Reaction by-products
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
Non corrosive nanoparticles should be more used

Reaction by-products should be minimised


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
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
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
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