Abstract
This paper studied the adsorption potentials and efficiency of low cost activated carbon produced from Senna occidentalis seeds for the removal of Methylene Blue dye in aqueous solutions. Batch adsorption experiments were carried out to investigate the effects of variables such as initial dye concentration, carbon dosage, contact time, pH and temperature to the process. Similarly, adsorption isotherms consisting Langmuir, Freundlich and Temkin were employed and found Langmuir Adsorption model fitted best. However, Kinetic models consisting pseudo first-order, pseudo second-order and intra-particle diffusion were also used to investigate the kinetic nature of the process, and found that pseudo second-order model better explained the process. Keywords: Equilibrium, Adsorption Isotherm, Kinetic Studies, Activated Carbon and Methylene Blue Dye DOI : 10.7176/CMR/11-4-04 Publication date : April 30 th 2019
Highlights
The environmental and health issues associated with residual colour in textile effluents have posed a major challenge to environmental scientists as well as the textile colouration processors (Joshi et al, 2004).Large scale production and the widespread application of synthetic dyes by various industries such as the textile, leather, tanning, food, cosmetics, paper printing, plastics etc. lead to severe contamination of surface and groundwater sources in the vicinity of dye industries (Ali et al, 2010).Synthetic dyes often have complex aromatic molecular structures that make them more difficult to naturally biodegrade
Materials and Methods The major materials used in this study are; Senna occidentalis seeds which was obtained from Birnin Kebbi local government area of Kebbi State, Nigeria, from which the adsorbent was prepared; Methylene blue dye which was purchased from Cardinal Scientific Supplies, Zaria, Nigeria, from which the adsorbate solution was prepared
2.1 Preparation of Adsorbent The adsorbent used in this study was adopted from the already prepared Senna Occidentalis Seeds Activated Carbon (SOSAC) with its preparatory methods been reported in the earlier work (Gulumbe et al, 2019)
Summary
Large scale production and the widespread application of synthetic dyes by various industries such as the textile, leather, tanning, food, cosmetics, paper printing, plastics etc. Synthetic dyes often have complex aromatic molecular structures that make them more difficult to naturally biodegrade. Their disposal in water bodies exhibit adverse effect to the aquatic and human life by creating eutrophication mutagenic, carcinogenic effects, dysfunction of the organs, having effect on aquatic ecosystem by preventing sunlight from reaching into the water bodies (Sharifi et al, 2018). Many studies have been undertaken for the removal of pollutants by using variety of materials (used as adsorbents) ranging from agricultural waste or agro-by-products such as; coir pith (Namasivayam and Kavitha, 2002), date seeds (Yakubu et al, 2008), rice husk (Sharma and Janveja, 2008), mango seed shell (Akpen et al, 2011), groundnut shell (Mohammed et al, 2015), tamarind seed (Okoli et al, 2015), aloe vera leaves shell (Omidi et al, 2017); biomass such as cellulose dust (Sharifi et al, 2018) to varieties of clays (Vimonsesa et al, 2009)
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