Application of seaweeds for the removal of lead from aqueous solution |
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| Institution: | 1. Department of Chemical Engineering, Sri Venkateswara College of Engineering, Sriperambudur 602105, Tamilnadu, India;2. Department of Chemical Engineering, Anna University, Chennai 600025, India;1. Institute for Marine and Atmospheric research Utrecht (IMAU), Utrecht University, PO box 80005, 3508 TA, The Netherlands;2. Copenhagen Center of Atmospheric Research (CCAR), Department of Chemistry, University of Copenhagen, Denmark;3. Department of Atmospheric Sciences, Institute of Astronomy, University of São Paulo, Brazil;1. Laboratoire de Biomatériaux et Phénomènes de Transport, Faculté des Sciences et de la Technologie, Université Yahia Fares de Médéa, Pole Universitaire, RN1, Médéa 26000 Algeria;2. Laboratoire de Génie de la Réaction, Faculté de Génie Mécanique et Génie des Procédés, Université Houari Boumediene, Bab Ezzouar, Alger 16111, Algeria;3. Ecole Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, 11 Allée de Beaulieu, CS 50837, 35708 Rennes Cedex 7, France;4. Université européenne de Bretagne, 5 Boulevard Laennec, 35000 Rennes, France;1. CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong 264003, PR China;2. University of Chinese Academy of Sciences, Beijing, 100049, PR China;3. Center for Ocean Mega-Science, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao, Shandong 266071, PR China;4. School of Resources and Environmental Engineering, Ludong University, Yantai, Shandong 264025, PR China;1. LEPABE – Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. IBMC – Institute for Molecular and Cell Biology, Rua do Campo Alegre 823, 4150-180 Porto, Portugal;3. ICBAS – Instituto de Ciências Biomédicas Abel Salazar, Rua de Jorge Viterbo Ferreira 228, 4050-313 Porto, Portugal;1. Tecnologico de Monterrey, School of Engineering and Sciences, Ave. Eugenio Garza Sada 2501, CP 64849, Monterrey, N.L, Mexico;2. Tecnologico Nacional de México-Instituto Tecnológico de Durango, Department of Chemical and Biochemical Engineering, Boulevard Felipe Pescador 1830, CP 34080, Durango, Dgo, Mexico |
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| Abstract: | Ten different seaweed species were compared on the basis of lead uptake at different pH conditions. The brown seaweed, Turbinaria conoides, exhibited maximum lead uptake (at pH 4.5) and hence was selected for further studies. Sorption isotherms, obtained at different pH (4–5) and temperature (25–35 °C) conditions were fitted using Langmuir and Sips models. According to the Langmuir model, the maximum lead uptake of 439.4 mg/g was obtained at optimum pH (4.5) and temperature (30 °C). The Sips model better described the sorption isotherms with high correlation coefficients at all conditions examined. Various thermodynamic parameters such as ΔG°, ΔH° and ΔS° were calculated indicating that the present system was a spontaneous and endothermic process. Through potentiometric titrations, number of binding sites (carboxyl groups) and pK1 were determined as 4.1 mmol/g and 4.4, respectively. The influence of co-ions (Na+, K+, Mg2+ and Ca2+) on lead uptake was well pronounced in the case of divalent ions compared to monovalent ions. The solution of 0.1 M HCl successfully eluted all lead ions from lead-loaded T. conoides biomass. The regeneration experiments revealed that the alga could be successfully reused for five cycles without any loss in lead biosorption capacity. A glass column (2 cm i.d. and 35 cm height) was used to study the continuous lead biosorption performance of T. conoides. At 25 cm (bed height), 5 ml/min (flow rate) and 100 mg/l (initial lead concentration), T. conoides exhibited lead uptake of 220.1 mg/g. The column was successfully eluted using 0.1 M HCl, with elution efficiency of 99.7%. |
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