Heavy 2008), air dissolved floatation (ADS) (Lundh et

Heavy metals discharged from different
industrial and treatment plants to the environment have received serious
attention because of their toxic, non-degradable, and bio
accumulative effect on
aquatic as well as to the human life. Among many known heavy
metals (specific gravity ? 5) like: Cu, Cd, Zn and Pb;  Cu (II) is widely used in many industries
including metal cleaning and plating baths, printed board circuit production, paints
and pigments, fertilizer,  pulp and paper
etc. (Kumar et al. 2011). Copper is one of important element required by humans
in trace amount for its role in enzyme synthesis, tissues and bones development
(Bilal et al. 2013). However, the divalent copper (Cu (II)) is toxic and
carcinogenic if consumed in excess. The excessive consumption of Cu (II) leads
to health related problems like deposition in liver leading to subsequent
vomiting, nausea, headache, respiratory problems, liver and kidney failure,
abdominal pain and gastrointestinal bleeding (Akar et al. 2009).

 In the present scenario, regulations which
control the concentration of toxic heavy metals from industrial effluents are
becoming more and more demanding (Ramos et al. 2016), as their adverse effect
is clearly visible. Various
treatment processes for remediation of Cu (II) from water and wastewater
include chemical precipitation (Fu and Wang 2011), floatation (Sudilovskiy
et al. 2008), air dissolved
floatation (ADS) (Lundh et al. 2000), coagulation/flocculation (Kurniawan
et al. 2006), ion exchange (Cavaco
et al. 2007; Alyuz and Veli 2009; Motsi et al. 2009; Inglezakis et al. 2002), complexion/sequestration
(Fu and Wang 2011),
electrochemical operation (Barakat 2011), membrane separation (Barakat and Schmidt 2010; Ahmad and Ooi 2010), reverse osmosis (Greenlee
et al. 2009), solvent
extraction, electro-flotation, biological treatment, and adsorption. Though, most
of the above mentioned methods are effective for treating high concentrations
of heavy metal ions but they are costly and not eco-friendly (Abdelwahab
et al. 2015). Adsorption using
activated carbon is much preferable due to its economic and effective removal of
low concentration of metal ions (

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