EVALUATION OF EFFECTS OF SELECTED FACTORS ON ADSORPTION KINETICS OF LEAD ION REMOVAL FROM AQUEOUS SOLUTIONS

• A Amoko

  Department of Chemistry, Adeyemi Federal University Education, Ondo, Nigeria

• S JUSTINAH

  Department of Chemistry, Adeyemi Federal University Education, Ondo, Nigeria;

• A Fehintola

  Department of Chemistry, Adeyemi Federal University Education, Ondo, Nigeria;

• O Ezekiel

  Department of Civil Engineering, Obafemi Awolowo University, Ile-Ife, Nigeria

• I Oke

  at Civil and Environmental Engineering Department, Elizade University, Ilara- Mokin, Ondo State, Nigeria.

• A Isaiah

  Department of Civil Engineering, Obafemi Awolowo University, Ile-Ife, Nigeria

This paper presents a report on the removal of lead ions (Pb²⁺) from aqueous solutions through adsorption techniques using powdered corncobs. Corncobs were collected from Obafemi Awolowo University agricultural farm. The corncobs were washed with distilled water to remove impurities. The corncobs were dried at room temperature, pulverized, sieved into different particle sizes using standard sieve sizes and stored. Powdered corncobs (PCCS) were separated based on the size. Its micrograph structure, physical and chemical properties were determined using standard methods. The PCCS was used as an adsorbent to remove Pb²⁺ from aqueous solutions and raw water through batch processes.  Effects of the mass of the adsorbent, the initial concentration of Pb²⁺, initial pH of the aqueous solution and particle size of PCCS on the adsorption kinetics and its models’ parameters were evaluated. 

The study shown that moisture content of the PCCS was 7.29 %, volatile solid at 550^oC and 1200^oC  were 96.88 %  and 99.44 % respectively. It was also revealed that  mass of adsorbent, pH, particle size of the adsorbent, initial concentration of Pb²⁺ and adsorption time were significant factors that had effects on adsorption of Pb²⁺ onto PCCS at 95 % confidence level. It was concluded that lead ion can be removed by PCCS, the mass of the adsorbent had significant effects on adsorption kinetics.

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