Lakhasly

biosorbent that leads to the decrease of total absorbent surface area (Bla zquez, Marti n-Lara, Tenorio, & Calero, 2011; Shakoor & Nasar, 2016).3.4.9.

biosorbent that leads to the decrease of total absorbent surface area (Bla ́zquez, Martı ́n-Lara, Tenorio, & Calero, 2011; Shakoor & Nasar, 2016). There are some other bioadsorbent such as Orange peel (Al-Azabi, Al-Marog, Abukrain, & Sulyman, 2018). Salix babylonica leaves (Khodabandehloo, Rahbar-Kelishami, & Shayesteh, 2017), lotus leaf (X. Han, Wang, & Ma, 2011) and Phonix tree’s leaves (R. Han et al., 2007) were utilized for the elimination of dye from water, same
effect of biosorbent dosage on the elimination rate and capac- ity was recorded.
3.4. Effect of contact time:
The adsorption of 25 mg L-1 of eosin dye was examined at dif- ferent contact time (10 – 80 min).
The relationship between the dye uptake and contact time is illustrated in Fig. 9. The Fig. 9 showed that, initially adsorp- tion rate is greater on the external surface of adsorbent fol- lowed by a slower internal diffusion phenomena that is rate determining step (Yaneva, Koumanova et al. 2013), (Gialam- ouidis, Mitrakas et al. 2010). The optimum time period for the adsorption of eosin on the biosorbent, in order to achieve the equilibrium, was found to be 60 min. Fig. 9 indicated that rate of adsorption is increased with contact time till 60 min and there after it line became straight line, showing the attainment of equilibrium.
Bai, M. Tukaram, et al., Fella, et al. and Raju, et al. were reported optimum contact time of 60 min or the elimination of eosin dye using biomass (Allouche, Yassaa, & Lounici, 2015; Bai, Anudeep, Raju, Rao, & Chittibabu, 2021).

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A. Bukhar