Abstract
The removal of (Cr) ions from industrial wastage by adsorption on rice husk was investigated based on activated pure rice husk dosage, stay time, metal concentration and solution temperature. The optimum values of activated pure rice husk dosage and stay time were determined to be 0.5gm/50ml solution and 60 mins, respectively, for the adsorption of (Cr) ions. The constant for the Freundlich, D-R and Langmuir isotherms were 50%, calculated at 50 . The adsorption of (Cr) from industrial wastage was found to be exothermic. Thermodynamic parameters such as free energy change ( G°), enthalpy change ( H°) and entropy change ( S°) of adsorption also calculated and interpreted from the slope and intercept of the plots of lnkD vs I/T. The G° value decreases with rise in temperature and the negative values of H° indicate that the adsorption of (Cr) from industrial wastage was an exothermic process while positive values of change in entropy ( S°) were also observed
Highlights
Rice husk is a waste product from different rice production industries
Rice husk is a waste substance that can be converted into an adsorbent material (Marshall and Johns, 2016; Marshall et al, 2019; Ahmedna et al, 2017) This product exhibits very good adsorption for “(Cr)” ion from industrial waste, and the quest for cheap waste treatment alternative has compelled the researches (Ahmedna et al, 2018; Johns et al, 2018; Marshall et al, 2019, 2016)
Rice husk is generated during the first stage of rice milling, when rough rice or paddy rice is husked, that is, husk is separated from the rest of the grain
Summary
Rice husk is a waste product from different rice production industries. Rice husk is a waste substance that can be converted into an adsorbent material (Marshall and Johns, 2016; Marshall et al, 2019; Ahmedna et al, 2017) This product exhibits very good adsorption for “(Cr)” ion from industrial waste, and the quest for cheap waste treatment alternative has compelled the researches (Ahmedna et al, 2018; Johns et al, 2018; Marshall et al, 2019, 2016). A high concentration removal of such metal ion is more effective by ion exchange or adsorption on solid sorbents such as activated pure rice husk (Qadeer et al, 2015). Pure rice husk which is a solid waste matter was used as an adsorbent for the removal of (Cr) metal ion from industrial waste (Khattak e.t al., 2000; Khattak et al, 2002).
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