Removal of toxic metals from solution by leaf, stem and root phytomass of Quercus ilex L. (holly oak)

Abstract

apsule'': Holly oak phytomass was useful as a bio®lter of toxic trace metals. AbstractIncreased consciousness for safeguarding the aqueous environment has prompted a search for alternative technologies for the removal of toxic metal ions from aqueous solutions. In this regard, a wide variety of biomass is being considered as adsorbents of heavy metals for treatment of industrial and domestic wastewaters as well as natural waters, including drinking water. In the present investigation, the potential of Quercus ilex phytomass from stem, leaf and root as an adsorbent of chromium (Cr), nickel (Ni), copper (Cu), cadmium (Cd) and lead (Pb) at ambient temperature was investigated. The metal uptake capacity of the root for different metals was found to be in the order: Ni>Cd>Pb>Cu>Cr; stem Ni>Pb>Cu>Cd>Cr; and leaf Ni>Cd>Cu>Pb>Cr. The highest amount adsorbed was Ni (root>leaf>stem). Data from this laboratory demonstrated that Ni is sequestered mostly in the roots, where concentrations can be as high as 428.4 ng/g dry wt., when 1-year-old seedlings were treated with Ni (2000 mg/l) in pot culture experiments, compared to 7.63 ng/g dry wt., control (garden and greenhouse soil) topsoil where Ni was present in trace amounts. This proves that the root biomass of Q. ilex has the capacity for complexing Ni. Cr exhibited the least adsorption values for all the three types of phytomass compared to other metals. The trend of adsorption of the phytomass was similar for Ni and Cd, i.e. root>leaf>stem. Desorption with 10 mM Na 4 EDTA was eective (55±90%) and, hence, there exists the possibility of recycling the phytomass. The biosorption results of recycled phytomass suggest that the selected adsorbents are re-usable. The advantages and potential of the Q. ilex phytomass as a bio®lter of toxic trace metals, the scope and need for enhancing the eciency of the Q. ilex phytomass as an adsorbent of metals are presented. #

Kinetic, Equilibrium and Thermodynamic Studies of the Biosorption of Heay Metals by <i>Ceratonia </i><i>Si</i><i>liqua</i> Bark

“…The advantages of biosorption lie in the good performance in metal removal, cost-effectiveness and eco-friendly to environment. Many biomaterials have been investigated as biosorbents for removal of heavy metals such as leaf, stem and root phytomass of Quercus ilex [9], pomegranate peel [10], banana (Musa paradisiaca), lemon (Citrus limonum) and orange (Citrus sinensis) peel [11], rice husk [12], peanut Biosorption of Heay Metals by Ceratonia siliqua Bark and grounded to a fine powder in a grinding mill (Retsch RM 100) and sieved to get size fraction < 44 µm. The C. siliqua bark powder was dried in an oven at 60℃ for 6 h and then stored in a desiccator to be used for the batch experiments.…”

Removal of Cd(II), Zn(II) and Pb(II) from aqueous solutions by brown marine macro algae: Kinetic modelling

“…A lot of materials such as bark, chitosan, wool, cotton, clay, bacteria, fungi, alginate, dead biomass, waste fruit residues and others [4,[6][7][8] have been reported to have an effective performance in removing heavy metals from industrial effluents.…”

Zinc adsorption and desorption characteristics in root cell wall involving zinc hyperaccumulation in Sedum alfredii Hance

“…Previous investigations showed that heavy metals bind to natural cellulosic materials (Bryant et al, 1992;Shukla and Sakhardande, 1992;Prasad and Freitas, 2000). This phenomenon, known as biosorption, has attracted increasing research interests recently.…”