1. Removal of Methyl Orange dye by Graphene Oxide from aqueous solution Md. Osim Aquatar1, Stephy Rangari2, Arshiya Tarannum2,S.S. Waghmare2, Tanvir Arfin2, Sadhana Rayalu2 1AcSIR PhD Scholar, 1,2EMD,CSIR-NEERI, Nagpur, India,
 ABSTRACT
In this study, Graphene Oxide (GO) powder was used for the adsorption of methyl orange (MO) dye from aqueous solution. GO powder have single layered graphite composition ornamented with a quantity of oxygen containing functionalities such as ketone, carboxyl, epoxy and hydroxyl groups which transmit a negative charge to it in aqueous solution at a broad range of pH. In order to obtain better specific surface area value and adsorption capacity, the graphene oxide (GO) powder was effectively prepared by Hummer’s modified method and was used as the adsorbent for the removal of methyl orange dye from aqueous solution. The as prepared adsorbent was characterized by Raman, XRD, FTIR, and zeta potential and SEM respectively. The adsorption process followed the Langmuir isotherm and the pseudo-second-order kinetic models. The current adsorption studies of MO dyes revealed the potential of GO powder to be utilized as adsorbents with excellent adsorption capacity for purification of water. Thus, GO powder can be predicted as a good quality adsorbent material for the adsorption of dye species. Additionally, the adsorbent can be easily reused by cleansing it with DI water. The regenerated GO powder exhibit a fairly adsorption performance which can be reused for dye removal. This outcome confirmed that the GO powder might be used as an excellent alternative for the efficient elimination of organic dyes from waste water in wide pH ranges.
SYNTHESIS OF GRAPHENE OXIDE(GO)
CHALLENGES
Dyes absorb and reflect sunlight in water diminishing photosynthesis & respiration activities of aquatic biota.
Many dyes and their breakdown products are carcinogenic, mutagenic and/or toxic to life.
Methyl orange(MO), a water-soluble azo dye, widely used in textile, printing, paper, food and pharmaceutical industries and research laboratories is a cause of concern.
Triple primary cancers involving skin, kidney, urinary bladder and liver of dye workers have been reported
Textile dyes can cause allergies like dermatitis and respiratory diseases, allergic reaction in eyes, skin irritation, and mucosal membrane disorder and the upper respiratory tract.
FACTS 
Dye contaminated wastewater is a matter of global concern
More than 10,000 commercially available dyes are existing
Amount of total dyes exceeds 700,000 tons per year globally
World Bank estimates that 17 to 20% of industrial water pollution emanates from textile dyeing and Treatment processes
In India, Bicchhadi area in Rajasthan is badly affected with dye pollution
The common treatment processes, such as sedimentation, flocculation and membrane filtration are insufficiently effective
Adsorption process have been considered as a robust and efficient alternative for treating dye contaminated wastewater
CHARACTERIZATION
CALIBRATION CURVE
RESULTS
CONCLUSION
From the preliminary study it has been found that GO is effectively remove approx. 90% of methyl orange dye from aqueous solution.
It’s found that the adsorption equilibrium is only 60min.
Different pH studies from 4-11 has been done.
The adsorption process fit the isotherm models very well.
Thus, the present investigation has provided a novel and promising method to improve the adsorption capacity of GO material for the adsorption of anionic dyes.
And the as-obtained GO can be used as an excellent adsorbent with the value of practical application for water remediation.
Effective Dye Removal(with diff.doses)
Raman Spectra
SEM Images of GO
Graphene Oxide(GO)
XRD Spectrum of GO
Acknowledgement
The work is being carried out under AcSIR and the authors gratefully acknowledge the financial support provided by the UGC and research facilities provided by CSIR-NEERI, Nagpur, India.
References
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Liu, Qiang, et al. "Efficient Removal of Methyl Orange and Alizarin Red S from pH-Unregulated Aqueous Solution by the Catechol–Amine Resin Composite Using Hydrocellulose as Precursor." ACS Sustainable Chemistry & Engineering 5.2 (2017):