{"id":10117,"date":"2022-08-03T04:20:14","date_gmt":"2022-08-03T04:20:14","guid":{"rendered":"https:\/\/file.currentschoolnews.com\/?post_type=product&p=10117"},"modified":"2022-08-03T08:09:56","modified_gmt":"2022-08-03T08:09:56","slug":"assessment-of-the-competitive-adsorption-of-some-heavy-metal-ions-onto-soil","status":"publish","type":"product","link":"https:\/\/pastexamquestions.com\/product\/assessment-of-the-competitive-adsorption-of-some-heavy-metal-ions-onto-soil\/","title":{"rendered":"Assessment of the Competitive Adsorption of Some Heavy Metal Ions onto Soil"},"content":{"rendered":"

– Assessment of the Competitive Adsorption of Some Heavy Metal Ions onto Soil –<\/strong><\/span><\/p>\n

Download Assessment of the Competitive Adsorption of Some Heavy Metal Ions onto Soil<\/strong><\/span>. Chemistry students who are writing their projects can get this material to aid their research work.<\/span><\/span><\/p>\n

Abstract<\/b><\/span><\/h2>\n

This research work assessed the adsorption of Cd2+, Cr6+, Cu2+ and Pb2 in single-metal and multi-metal ions reaction systems onto a standard reference soil (NIST SRM 2709a).<\/p>\n

The effect of varying adsorbent dosage, contact time and initial concentration of the metal ions on the soil was examined and for most of the metals, the optimum conditions were attained at 20 mg\/dm3 initial metal ion concentration, 1.0 g adsorbent dose and 2 hrs contact time.<\/p>\n

The highest percentage adsorption of Cd2+, Cr6+, Cu2+, and Pb2+obtained from their respective solutions were 92.22%, 56.71%, 99.57% and 97.11%. Equilibrium studies showed that the Freundlich isotherm had a better fit for the selected metals than Langmuir isotherm.<\/p>\n

The kinetics study revealed that all the selected metal ions followed the pseudo- second order model. The results of the experiments confirmed that adsorption from single- metal solution was more effective than adsorption under multi-metal conditions due to competitive effects.<\/p>\n

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Introduction<\/span><\/span><\/strong><\/span><\/h2>\n

Soil is one of the key elements in the ecosystems. It provides the nutrient-bearing environment for plant life and it is important for degradation of biomass.<\/p>\n

Soil is a very complex heterogeneous medium, which consists of solid phases (the soil matrix) containing minerals and organic matter and fluid phases (soil water and the soil air); which interact with each other and ions entering the soil system (Brady and Weil, 2002).<\/p>\n

The ability of soils to adsorb metal ions from aqueous solution is of special interest and has consequences for both agricultural issues (such as soil fertility) and environmental questions such as remediation of polluted soils and waste deposition (Bradl, 2004).<\/p>\n

Heavy metals are group of elements between copper and lead on the Periodic Table, having atomic weights between 63.55 and 200.59, high density, precisely greater than 5 gcm-3 and specific gravities greater than 4.0 (Hawkes, 1997).<\/p>\n

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