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Volume 8 Journal of Environmental & Analytical Toxicology EnviTox Summit 2018
September 17-18, 2018
September 17-18, 2018 Singapore
18th Global Summit on
Environmental Toxicology and Pharmacology
Tholiso Ngulube et al., J Environ Anal Toxicol 2018, Volume 8
DOI: 10.4172/2161-0525-C2-015
The treatment of dye contaminated wastewater using crypto-crystalline magnesite
Tholiso Ngulube1, Jabulani Ray Gumbo1, Vhahangwele Masindi2,3 and Arjun Maity4
1University of Venda, South Africa
2Council for Scientific and Industrial Research, South Africa
3University of South Africa, South Africa
4Council for Scientific and Industrial Research, South Africa
Discharging industrial colored wastewaters into aqueous
environments can cause adverse effects on aquatic life due to the
toxic nature of synthetic dyes. The present study aimed to evaluate the
efficiency of using crypto-crystalline magnesite to remove an anionic
dye (Methyl Orange; MO) from aqueous systems. To achieve that,
several operational factors like residence time, adsorbent dosage, species
concentration and temperature were appraised. The batch study proved
that crypto-crystalline magnesite is effective in the treatment of MO
contaminated water and moreover it performed well in terms of color
removal. The removal efficiency of crypto-crystalline magnesite was
found to be 85.85% for 30 mg/L of MO solution. Four different kinetic models, viz., pseudo-first-order, pseudo-second-order,
intra-particle diffusion and Elovich were used to fit the kinetics data. The adsorption kinetics process primarily followed the
pseudo-second-order model indicating chemisorption. The best-fitted adsorption isotherm models were found to be in the
order Temkin (0.96)>Dubinin Radush Kevich (0.88)>Langmiur (0.81)>Freundlich (0.30). In accordance with the results of
this study, it can be concluded that crypto-crystalline magnesite can be used effectively for the adsorption of methyl orange in
wastewater and thus can be applied to treat wastewater containing dyes.
Recent Publications
1. Ngulube T, Gumbo J R, Masindi V and Maity A (2017) An update on synthetic dyes adsorption onto clay based minerals:
A state-of-art review. Journal of Environmental Management; 191: 35-57.
2. Masindi V, Ngulube T and Gitari WM (2015) Kinetics and equilibrium studies for removal of fluoride from underground
water using crypto-crystalline magnesite. Journal of Water Reuse and Desalination; doi:10.2166/wrd.2015.080.
Biography
Tholiso Ngulube has completed her PhD in Environmental Sciences from the University of Venda in South Africa. She is a Member of the Water Institute of Southern
Africa. She has also published articles in international peer reviewed journals and has also attended various international conferences in the environmental
sciences field. She has been serving as a Core Lecturer at Applied Centre for Climate and Earth Science Systems (ACCESS) and is also a Tutor and Mentor at
the University of Venda.