Characterization of Cassava Root Husk Powder: Equilibrium, Kinetic and Modeling Studies as Bioadsorbent for Copper(II) and Lead(II)  

作　　者：Kaupa Philip Rebecca Jacob Janarthanan Gopalakrishnan Kaupa Philip;Rebecca Jacob;Janarthanan Gopalakrishnan(Department of Applied Sciences, PNG University of Technology, Lae, Papua New Guinea;School of Chemistry, University of Sydney, Sydney, Australia)

机构地区：[1]Department of Applied Sciences, PNG University of Technology, Lae, Papua New Guinea [2]School of Chemistry, University of Sydney, Sydney, Australia

出　　处：《Journal of Encapsulation and Adsorption Sciences》2021年第2期69-86,共18页封装与吸附期刊（英文）

摘　　要：This study was aimed to investigate Pb(II) and Cu(II) ions removal ability from aqueous solution by cassava root husks (CRH) as a cheap, sustainable and eco<span>-</span><span><span>friendly bioadsorbent. The CRH was characterized by Fourier Transform Infrared (FTIR) spectroscopy which indicated the availability of various functional groups for metal coordination and the result was supported by elemental analysis studies. UV-Visible spectral studies indicated the presence of oxalate (</span><img src="Edit_88f5f86a-6e96-4764-8dc0-31bbb7ac83c6.png" width="34" height="18" alt="" /></span><span><span></span><span><span>) </span><span>and it could possibly interact with metal ions to give rise to a stable chelated coordination complex which affects metal ions removal efficiency. Bioadsorption process was carried out as a function of metal concentration, contact time, pH of the solution, particle size</span></span><span>,</span><span> and dosage of the adsorbent. Experimental results indicated the optimal adsorption condition of pH 4 for both Pb(II) and Cu(II) ions, dosage of 0.1</span><span style="font-family:;" "=""> </span><span>g/0.1L and 1</span><span style="font-family:;" "=""> </span><span>g/0.1L for Pb(II) and Cu(II) ions respectively, adsorption equilibrium time of 2 and 25 minutes for Pb(II) and Cu(II) respectively, and concentration of 0.5 mg/L for both metal ions. Kinetic data best</span><span style="font-family:;" "=""> </span><span>fitted pseudo-second-order model and not </span><span>the </span><span>pseudo-first-order model. Equilibrium data best fitted </span><span>the </span><span>Freundlich model than </span><span>the </span><span>Langmuir model. Specific surface area and pore volume studies indicated that CRH is non-porous and hence rapid adsorption kinetics is expected. Supporting the experimental results, molecular modeling studies performed using Schr<span style="white-space:nowrap;">&ouml</span>dinger software predicted several sites in the structure capable of docking with metal ions.</span></sThis study was aimed to investigate Pb(II) and Cu(II) ions removal ability from aqueous solution by cassava root husks (CRH) as a cheap, sustainable and eco<span>-</span><span><span>friendly bioadsorbent. The CRH was characterized by Fourier Transform Infrared (FTIR) spectroscopy which indicated the availability of various functional groups for metal coordination and the result was supported by elemental analysis studies. UV-Visible spectral studies indicated the presence of oxalate (</span><img src="Edit_88f5f86a-6e96-4764-8dc0-31bbb7ac83c6.png" width="34" height="18" alt="" /></span><span><span></span><span><span>) </span><span>and it could possibly interact with metal ions to give rise to a stable chelated coordination complex which affects metal ions removal efficiency. Bioadsorption process was carried out as a function of metal concentration, contact time, pH of the solution, particle size</span></span><span>,</span><span> and dosage of the adsorbent. Experimental results indicated the optimal adsorption condition of pH 4 for both Pb(II) and Cu(II) ions, dosage of 0.1</span><span style="font-family:;" "=""> </span><span>g/0.1L and 1</span><span style="font-family:;" "=""> </span><span>g/0.1L for Pb(II) and Cu(II) ions respectively, adsorption equilibrium time of 2 and 25 minutes for Pb(II) and Cu(II) respectively, and concentration of 0.5 mg/L for both metal ions. Kinetic data best</span><span style="font-family:;" "=""> </span><span>fitted pseudo-second-order model and not </span><span>the </span><span>pseudo-first-order model. Equilibrium data best fitted </span><span>the </span><span>Freundlich model than </span><span>the </span><span>Langmuir model. Specific surface area and pore volume studies indicated that CRH is non-porous and hence rapid adsorption kinetics is expected. Supporting the experimental results, molecular modeling studies performed using Schr<span style="white-space:nowrap;">&ouml</span>dinger software predicted several sites in the structure capable of docking with metal ions.</span></s

关 键 词：Bioadsorption Langmuir Isotherm Freundlich Isotherm Pseudo-First-Order Kinetics Pseudo-Second-Order Kinetics Cassava Root Husk Molecular Modeling 

分 类 号：O17[理学—数学]