Article

Biosorption of Lead From Aqueous Solutions by Green Algae Spirogyra Species: Kinetics and Equilibrium Studies

Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India.
Journal of Hazardous Materials (Impact Factor: 4.53). 04/2008; 152(1):407-14. DOI: 10.1016/j.jhazmat.2007.07.028
Source: PubMed

ABSTRACT

Biosorption is the effective method for the removal of heavy metal ions from wastewaters. Results are presented showing the sorption of Pb(II) from solutions by biomass of commonly available, filamentous green algae Spirogyra sp. Batch experiments were conducted to determine the biosorption properties of the biomass and it was observed that the maximum adsorption capacity of Pb(II) ion was around 140mgmetal/g of biomass at pH 5.0 in 100min with 200mg/L of initial concentration. Temperature change in the range 20-40 degrees C affected the adsorption capacity and the nature of the reaction was found to be endothermic in nature. Uptake kinetics follows the pseudo-second-order model and equilibrium is well described by Langmuir isotherm. Isotherms have been used to determine thermodynamic parameters of the process, viz., free energy change, enthalpy change and entropy change. Various properties of the algae, as adsorbent, explored in the characterization part were chemical composition of the adsorbent, thermal analysis by TGA, surface area calculation by BET method, surface morphology with scanning electron microscope images and surface functionality by FTIR. FTIR analysis of algal biomass revealed the presence of amino, carboxyl, hydroxyl and carbonyl groups, which are responsible for biosorption of metal ions. The results indicated that the biomass of Spirogyra sp. is an efficient biosorbent for the removal of Pb(II) from aqueous solutions.

    • "Several conventional methods, including chemical precipitation, lime softening [6], evaporation, membrane filtration, desalination, chemical coagulation and flocculation, ion exchange, electrodialysis and reverse osmosis [7] [8] [9] [10], have been employed for heavy metal removal from industrial wastewaters. However, these methods have some limitations, which include high energy cost, production of oxidation by-products, need to regenerate ion exchange resins, bulk generation of toxic sludge in flocculation/coagulation methods, short ozone half-life in ozonation and membrane fouling during the filtration process. "
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    ABSTRACT: In this work, date palm trunk (DPT) fibre was investigated for the eviction of copper ions (Cu2+) from aqueous solution. The surface chemistry of the DPT adsorbent was characterized through Fourier transform infrared spectroscopy and X-ray powder diffraction. The specific surface area and the average crystalline size of the DPT fibre adsorbent were measured as 2.104 m2 g−1 and 320 nm, respectively. Equilibrium adsorption was achieved at 150 min and results reflected significantly higher adsorption of Cu2+ onto DPT fibre at pH 5 (6 mg g−1, 12%) than at pH 2–4 (1–4 mg g−1, 1–7%). The adsorption data revealed maximum removal (25.4 mg g−1) at the adsorbent dose of 5 g L−1. Significantly, removal (34 mg g−1) was observed with particles 75 μm and Cu2+ removal was significantly higher (6–23 mg g−1) with increasing Cu2+ concentration from 20 to 100 mg L−1. Adsorption kinetics data were modelled using pseudo-first-order and pseudo-second-order kinetics. The behaviour and the nature of Cu2+ adsorption were analysed by employing the Langmuir, Freundlich, Harkins–Jura (H–J) and Dubinin–Radushkevich (D–R) isotherm models. The results reflect that the adsorption isotherm model fitted the experimental data in the following order: Langmuir (R2, 0.9933) > H–J (R2, 0.9869) > Freundlich (R2, 0.9768) > D–R (R2, 0.8827) with monolayer Cu2+ adsorption. The experimental data were best explained by a Langmuir isotherm model and pseudo-second-order kinetics with R2 = 0.9933 and 0.9905, respectively, and qmax of 25.25 mg g−1 with chemisorption (E = 14.59 kJ mol−1). The homogeneity of the adsorbent surface functional groups makes DPT suited for sequestering toxic Cu2+ from wastewater. Suitable physical, chemical and physicochemical surface modifications can further improve the adsorption capabilities of DPT adsorbents.
    No preview · Article · Jan 2016 · Desalination and water treatment
    • "The mining and metallurgy of cadmium, the manufacture of batteries, ceramics and pigment industries generate effluents that contain cadmium, which is also present in many wastewaters . These effluents are usually treated by physicochemical methods such as precipitation, evaporation, adsorption and ion exchange, among others (Gupta and Rastogi 2008). All these methods entail significant economic investment, with high operation costs and even generation of secondary waste, difficult to remove (Chen et al. 2014). "
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    ABSTRACT: The nitrogen-fixing cyanobacterium Anabaena sp. ATCC 33047, which generates substantial amounts of exopolysaccharide, was immobilized by entrapment within the reticulate network of polyurethane foam discs. The immobilized Anabaena sp. system has been investigated as a potential biosorbent for the removal of cadmium from aqueous solutions. The results showed that it was a highly fast process, with 80 % of the adsorption taking place in the first 10 min, reaching full equilibrium in about 50 min. Data analysis indicated that the behaviour of the system accurately fits to a monolayer adsorption model (Langmuir isotherm). The maximal biosorption capacity determined for the immobilized Anabaena sp. system was as high as 162 mg Cd (II) per gram dry biomass. The outstanding properties established for immobilized Anabaena sp. in polyurethane foam underline the relevance of such a system as an alternative to current treatments of variety effluents or wastewater contaminated with cadmium.
    No preview · Article · May 2015 · International journal of Environmental Science and Technology
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    • "The effect of various parameters (e.g., pH, metal concentration, time, temperature, agitation speed, and inoculum dose) on the growth and removal of metals is initially optimized in batch mode. Biosorption of metals and metal complex dyes using bacteria, algae, and fungi has been reported by various scientists using simple batch bioreactors (Aksu and Karabayır 2008; Gupta et al. 2008a, b; Kalpana et al. 2011; Bulgariu et al. 2012; Mala et al. 2015). These studies have are listed in Tables 1–3. "

    Full-text · Article · Apr 2015 · Journal of Environmental Engineering
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