Effect of Mineral Systems Injected with Zinc Sulfide on Arsenite Removal from Aqueous Solution: Part II

Egirani, Davidson

doi:10.11648/j.ajac.20150306.14

Cited by 3 publications

(14 citation statements)

References 16 publications

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“…This favoured mercury adsorption. Increase in the adsorption of mercury by biomass, maximizing at pH = 8 and plateauing thereafter has been reported [9]. This paper reports a similar pattern of adsorption.…”

Section: Resultssupporting

confidence: 83%

“…Contact time and pH are regulating factors in the hydrolysis of mercury ions and species solubility. Huang and Lin have reported an increase in adsorption of mercury by biomass as pH was increased [3,8,9]. Particle concentration, particle sizes and chemistry of the adsorbent control the diminution of mercury removal from the aquatic environment [10].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of goethite coated with copper oxide and its effect on the removal of aqueous mercury(II) ions

Egirani

Poyi

Wessey

et al. 2018

Journal of Taibah University for Science

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This paper has investigated the synthesis and characterization of CuO-coated goethite and its application in the removal of mercury. The presence of CuO coating significantly modified the adsorption pattern of mercury on goethite. The synthesis was carried out in a trimetric manner and characterization was conducted using standard laboratory procedures. Batch mode technique under reducing conditions at ambient temperature was used to determine mercury adsorption on CuO-coated goethite. Reaction mechanism indicated a less than one proton coefficient (0.68), an intraparticle diffusion that was controlled by boundary layer, an intercept C equals to 444.45, =0 and mass transfer rates (8.752 -6 cm h -1 and 7.216 -7 cm h -1 ) higher than those of previous studies. ARTICLE HISTORY

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Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of goethite coated with copper oxide and its effect on the removal of aqueous mercury(II) ions

Egirani

Poyi

Wessey

et al. 2018

Journal of Taibah University for Science

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“…The proton coefficient otherwise known as the proton exchange isotherm was derived from change of pH versus Log Kd plot. This was based on Freundlich isotherm (Egirani and Wessey 2015b;Wang et al 2016) as given by Eqs. (1, 2):…”

Section: Batch Mode Adsorption Experimentsmentioning

confidence: 99%

“…Here, SOH equals the mineral surface binding site, SO − equals the soluble arsenite species, logK p equals the apparent equilibrium binding constant, and α equals the coefficient of protonation. This represents the number of protons displaced when one mole of metal binds to the mineral surface (Egirani and Wessey 2015a;Contescu et al 1993;Arshadi et al 2014). The plot of logKd versus pH provided the slope as the proton coefficient.…”

Section: Batch Mode Adsorption Experimentsmentioning

confidence: 99%

“…The fast process of intraparticle diffusion and slow process of outer-sphere complexation are components of the reaction mechanism involved in Lead uptake in aqueous solution (Bonnet et al 2017;Dhal et al 2013;Khodadadi et al 2017). In addition, Lead removal from the aquatic environment is controlled by solution concentration and exchange of ions (Egirani and Wessey 2015a;Wang et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of kaolinite coated with copper oxide and its effect on the removal of aqueous Lead(II) ions

et al. 2019

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The removal of Lead (Pb 2+) ions from waste water in the aquatic environment by copper oxide-kaolinite composite forms an important step involved in the reduction of Lead ions in the environment. The study investigated the synthesis, characterization, and application of copper oxide-kaolinite composite in the removal of Lead ions from aqueous systems. The synthesis of the composite involved a trimetric process to produce the copper oxide (CuO)-kaolinite composite. The characterization involved the determination of cation exchange capacity, specific surface area, and spectral analysis by sodium saturation method, nitrogen gas adsorption techniques, and scanning electron spectroscopy, respectively. The determination of parameters affecting the reaction mechanism and reaction kinetics involved the use of batch mode techniques. The findings indicated a reaction mechanism that was less than one proton coefficient, higher mass transfer rates when compared with uncoated kaolinite. Here, the intraparticle diffusion was higher than the value for the uncoated kaolinite. The reactions based on Pb 2+ initial concentration indicated that the coated kaolinite gradually became saturated as the concentration was increased. The reactions based on solid concentration (Cp) demonstrated a complex change in the capacity of adsorption over different Pb 2+ concentrations (10-40 mgL −1) and solid concentrations (2-10 gL −1). Here, the reduction in specific surface area, particle size increase, mineral aggregation, and concentration gradient effect controlled the complex changes in adsorption. In conclusion, the copper oxide-kaolinite composite significantly enhanced the adsorption of Pb 2+ ions.

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Genesis, Uses and Environment Implications of Iron Oxides and Ores

Egirani¹,

Latif²,

Poyi³

et al. 2018

Iron Ores and Iron Oxide Materials

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Iron oxides are chemical complexes which occur naturally, comprising iron and oxygen. Here, together, 16 types of iron oxides and oxyhydroxides have been identified. These two components of oxides are widely spread naturally. They are vital to humans and useful in most geological and biological activities. In addition, they are useful as pigments and catalyst in industries and hemoglobin in blood circulation. The interplay and conversion of these components from one form to another are essentially controlled by bacterial species. These contain 70 and 72% iron, respectively. Furthermore, iron ores are classified in terms of occurrence. Banded iron formation (BIF) comprises 15% iron, comprising minerals of iron that are bedded besides silica. Beneficiation processes of iron ore generate dust in the atmosphere, acid mine drainage in the ecosystem and metallic iron for steelmaking. Beneficiation process requires dissolution of minerals surrounding the ore and the release of metals and cement matrix into water courses. These generates acid leading to acid mine drainage. Therefore, there is a need for impact assessment of the environment in the planned beneficiation cycle. Sustainable beneficiation must be done to reduce impact on the natural, social or economic environment.

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Effect of Mineral Systems Injected with Zinc Sulfide on Arsenite Removal from Aqueous Solution: Part II

Cited by 3 publications

References 16 publications

Synthesis and characterization of goethite coated with copper oxide and its effect on the removal of aqueous mercury(II) ions

Synthesis and characterization of goethite coated with copper oxide and its effect on the removal of aqueous mercury(II) ions

Synthesis and characterization of kaolinite coated with copper oxide and its effect on the removal of aqueous Lead(II) ions

Genesis, Uses and Environment Implications of Iron Oxides and Ores

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