Absorption Reaction Model

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Adsorption reaction models are originating from chemical reaction kinetics and are based on the complete process of adsorption without considering these intermediate steps mentioned above (Pan et al. 2009). Pseudo first order model proposed by Lagergren (1898) and pseudo second order model proposed by Ho and McKay (1998) are the adsorption reaction models which are commonly used to simulate the sorption kinetics data of liquid –solid phase adsorption of metal cations onto bio-adsorbents. Pseudo first order model is described by the following equation: (dQ_t)/dt=K_1 (Q_e-Q_t) 1 Where k1 (min-1) pseudo first order rate constant for the model, Qe and Qt (mg/g) are the adsorption capacities at equilibrium and time t respectively. This has been…show more content…
Adsorption is an economically viable and environmentally benign metal removal technique in comparison to membrane filtration, chemical precipitation and coagulation-flocculation techniques. Bio-materials generated as agricultural waste draw much attention as potential bio adsorbents and the efficiency of such treatments depends mainly on the adsorbent/adsorbents. Due to the heterogeneity within the material, adsorption capacities vary even for the same material in different studies. This is a detriment of using bio-adsorbent as a potential wastewater treatment technique as the ultimate removal efficiency relies on the properties of the…show more content…
To minimise the impact on receiving water due to heavy metals, it is essential to have an appropriate wastewater treatment system. Numerous studies have been undertaken to remove heavy metal from industrial wastewater. Removal of heavy metals by various sorbent materials has been investigated in the past. However, the effectiveness of such a treatment method based on adsorption strongly depends on the characteristics of the sorbent materials. Even though there are studies on the influence of these characteristics of bio- adsorbents on adsorption, the relationship between these characteristics and the adsorption kinetics is not evidently explained. Understanding these parameters and how they affect the adsorption is important in removing heavy metals from the industrial wastewater. The current research will address this knowledge gap by identifying the following research problems: What are the factors that influence the removal of heavy metals? How do these factors influence heavy metal removal kinetics of

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