Abstract
In this article, we study modified nano-hydroxyapatite (HAp) by nano manganese oxide (Mn3O4) as adsorbent material to remove iron ions from groundwater. Different parameters were studied to option optimum conditions of removing such as contact time, pH, initial concentration, a dosage of adsorbent, agitation speed and temperature. Kinetics studies included first order (R2 = 0.915), pseudo-first order (R2 = 0.936), second order (R2 = 0.948), pseudo-second order (R2 = 0.995), Elovich equation model (R2 = 0.977), intraparticle diffusion (R2 = 0.946), Natarajan and Khalaf (R2 = 0.915) were carried out, the obtained results revealed that the pseudo-second order is the best to describe the adsorption process because the correlation coefficient is approaching one (R2 = 0.995). Adsorption isotherm was calculated by using Freundlich, Langmuir and Temkin constants, adsorption capacity from Langmuir model was 0.606 mg/g. Thermodynamic parameters (ΔG, ΔH = −51 KJ/mol, and ΔS = −142 (KJ/mol)) for the adsorption process were also calculated and discussed.
Highlights
We study modified nano-hydroxyapatite (HAp) by nano manganese oxide (Mn3O4) as adsorbent material to remove iron ions from groundwater
Kinetics studies included first order (R2 = 0.915), pseudo-first order (R2 = 0.936), second order (R2 = 0.948), pseudo-second order (R2 = 0.995), Elovich equation model (R2 = 0.977), intraparticle diffusion (R2 = 0.946), Natarajan and Khalaf (R2 = 0.915) were carried out, the obtained results revealed that the pseudo-second order is the best to describe the adsorption process because the correlation coefficient is approaching one (R2 = 0.995)
The simple function has caused this method to be one of the best ways to remove iron ions from groundwater such as Polyvinyl alcohol was used for removal of bromothymol blue and methylene blue from [9]
Summary
It is one of the most difficult problems that pollute the groundwater and the presence of iron. The adsorption method is more commonly used, adsorption is an effective technology to remove different contaminated from aqueous solutions. In this process, a very high rate of adsorption and excretion occurs. Removal of natural organic matter and its constituents from water by metal oxides and hydroxides based adsorbents were investigated [10]. Removal of benzotriazole and benzimidazole from water over a Co-based metal azolate framework MAF-5(Co) was investigated [17]
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