Biosorption of Cd+2 by green plant biomass, Araucaria heterophylla: characterization, kinetic, isotherm and thermodynamic studies
| Autor: | K. Kishore Kumar, B. Sarada, Ch. V. R. Murthy, M. Krishna Prasad |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Langmuir
Sorbent 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences 01 natural sciences symbols.namesake Adsorption lcsh:Water supply for domestic and industrial purposes Botany Freundlich equation 0105 earth and related environmental sciences Water Science and Technology 021110 strategic defence & security studies lcsh:TD201-500 Aqueous solution Chemistry Biosorption Langmuir adsorption model Gibbs free energy Kinetics FTIR SEM symbols Araucaria heterophylla Cadmium(II) Nuclear chemistry |
| Zdroj: | Applied Water Science, Vol 7, Iss 7, Pp 3483-3496 (2017) |
| ISSN: | 2190-5495 2190-5487 |
| Popis: | The present study attempted to analyze the biosorption behavior of novel biosorbent, Araucaria heterophylla (green plant) biomass, to remove Cd+2 from solutions against various parameters, i.e., initial metal ion concentration, pH, temperature, sorbent dosage and biomass particle size. The maximum biosorption was found to be 90.02% at pH 5.5 and biosorption capacity (q e) of Cd+2 is 9.2506 mg g−1. The Langmuir and Freundlich equilibrium adsorption isotherms were studied and it was observed that Freundlich model is the best fit than the Langmuir model with correlation co-efficient of 0.999. Kinetic studies indicated that the biosorption process of Cd+2 well followed the pseudo-second-order model with R 2 0.999. Thermodynamic studies observed that the process is exothermic (ΔH ° negative). Free energy change (ΔG °) with negative sign reflected the feasibility and spontaneous nature of the process. The chemical functional –OH groups, CH2 stretching vibrations, C=O carbonyl group of alcohol, C=O carbonyl group of amide, P=O stretching vibrations and –CH groups were involved in the biosorption process. The XRD pattern of the A. heterophylla was found to be mostly amorphous in nature. The SEM studies showed Cd+2 biosorption on selective grains of the biosorbent. It was concluded that A. heterophylla leaf powder can be used as an effective, low-cost, and environmentally friendly biosorbent for the removal of Cd+2 from aqueous solution. |
| Databáze: | OpenAIRE |
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