Abstract
In this work, the adsorption of crystal violet dye from aqueous solution on charcoal and rice husk has been investigated, where the impact of variable factors (contact time; the dosage of adsorbent, pH, temperature, and ionic strength) have been studied. It has been found that charcoal and rice husk have an appropriate adsorption limit with regards to the expulsion of crystal violet dye from fluid arrangements. The harmony adsorption is for all intents and purposes accomplished in 45 min for charcoal and 60 min for rice husk. The amount of crystal violet dye adsorbed (0.4 g of charcoal and 0.5 g of rice husk) increased with an increasing pH and the value of 11 is the best. The effect of temperature on the adsorption process was studied at the range (298-323) K. The test comes about were broken down by utilizing Freundlich and Tempkin isotherm models, where the Freundlich and Tempkin factors were determined, and it has been found that the adsorption isotherm obey the Freundlich isotherm. The effect of ionic strength on the adsorption process was studied also via sodium chloride electrolyte solution; the results have been revaled that the sodium ion has a positive impact on the adsorption process. The thermodynamic parameters are shown estimated as ∆H values were 2.8012 kJ mol-1 and 5.8252 kJ mol-1 for charcoal and rice husk, respectively; this behavior referred to endothermic adsorption.
Highlights
Various methods have been used to remove the contaminants from the wastewater, like; ion exchange, activated carbon adsorption, membrane technology, and coagulation, degradation and so on, but it has been found that the adsorption process is the superior technique to other processes of removing dyes from aqueous worldwide
The adsorbent dosage is an imperative parameter in the adsorption process; the experiments were done by using different amounts of the charcoal and rice husk for a given initial concentration of dye solution 8ppm at 25◦C
It can be observed that the adsorption process exhibits immediate rapid adsorption and reaches equilibrium within a short period of 45 min for charcoal and 60 min for rice husk [16]
Summary
Various methods have been used to remove the contaminants from the wastewater, like; ion exchange, activated carbon adsorption, membrane technology, and coagulation, degradation and so on, but it has been found that the adsorption process is the superior technique to other processes of removing dyes from aqueous worldwide. Some minimal effort plant squander had been utilized as an adsorbent for color adsorption from wastewater treatment. The utilization of untreated plant squanders adsorbent can likewise bring a few issues, for example, bring down adsorption limit, higher synthetic oxygen request and natural substance request and add up to natural carbon due to the discharged of the solvent natural compound contained in the plant material [9, 10]. The CV is absorbed by the creatures in the water and affected their lives; the waste water containing crystal violet dye needs to be treated before it is discharged into water bodies [14]. The present work involves using plant rice husk and charcoal as a reasonable sorbent for the removal of crystal violet from aqueous solutions and check the freundlich and Temkin isotherms.
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