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Abstract
The equilibrium sorption of a local Ayous (Triplochiton scleroxylon) wood sawdust was examined as substitute adsorbent for removal of paraquat from water. Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (DRK) isotherms were used to compare the equilibrium sorption data obtained. The separation factor revealed a constructive sorption experiment since the maximum monolayer coverage (Q0) from Langmuir isotherm model was found out to be 41.66 µmol/g. In addition, the correlation value of Langmuir isotherm model was the maximum among the four adsorption isotherms. From Freundlich isotherm model, the sorption intensity (n) that denotes favorable sorption and the correlation value are 2.402 and 0.929, respectively. Temkin isotherm model was used to calculate the heat of sorption process which corresponds to 18.39 J/mol, and the mean free energy was estimated from DRK isotherm model to be 0.091 kJ/mol which vividly proved that the adsorption experiment was obeyed to a physical process. The results indicate that this local wood sawdust could be employed as an economical material for reducing paraquat from industrial wastewater.
Highlights
IntroductionIn most developed and developing countries, current agricultural and industrial production is based on the use of inputs to overcome the factors limiting the production such as insects, fungi, weeds (Carter 2000)
Four adsorption isotherm models were examined in this research work; investigation of the equilibrium sorption was carried out at 25 °C and pH between 6.3 and 6.5
The sorption data were fitted into Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherms
Summary
In most developed and developing countries, current agricultural and industrial production is based on the use of inputs to overcome the factors limiting the production such as insects, fungi, weeds (Carter 2000). The use of pesticides, which designate substances intended to fight against plant and animal pests, harmful to crops and humans (Worthing 1979), makes it possible to optimize yields and ensure significant production and to be viable. The storage, transportation and systematic use of these products are, accompanied by significant pollution which is at the root of the destruction of the ecosystem equilibrium. Pesticides are ecologically important due to their high toxicity for living organisms including human beings (Volesky 2001). The toxicological profile of this contaminant is a potential risk for the environment and public health (Bhattacharya et al 2006; Mishra and Patel 2009).
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