Surface modification of Nizimuddinia zanardini and Stoechospermum marginatum using 4-phenyl-3-thiosemicarbazide to improve heavy metals biosorption from water
Autor: | Ahmad Asadinezhad, Hamid Zilouei, Kiomars Zargoosh, A. Yousefi Abdolmaleki, S. A. Alavi |
---|---|
Rok vydání: | 2017 |
Předmět: |
021110 strategic
defence & security studies Langmuir Environmental Engineering Aqueous solution Chemistry Metal ions in aqueous solution Inorganic chemistry 0211 other engineering and technologies Biosorption Langmuir adsorption model Chemical modification 02 engineering and technology 010501 environmental sciences 01 natural sciences symbols.namesake Adsorption symbols Environmental Chemistry Freundlich equation General Agricultural and Biological Sciences 0105 earth and related environmental sciences |
Zdroj: | International Journal of Environmental Science and Technology. 15:993-1000 |
ISSN: | 1735-2630 1735-1472 |
DOI: | 10.1007/s13762-017-1441-9 |
Popis: | Surface modification of two algal biomasses, Nizimuddinia zanardini and Stoechospermum marginatum, using 4-phenyl-3-thiosemicarbazide ligand was performed to investigate the consequences on the adsorption of heavy metals from aqueous solution. Stabilization of amino group of 4-phenyl-3-thiosemicarbazide on the surface of biomasses was confirmed using Fourier transform infrared spectroscopy. Chemical modification was found to exert significant positive effects on biosorption. Adsorption capacities for Pb(II), Cd(II) and Cr(VI) using modified N. zanardini were observed to be 19.3, 16.75 and 15.75 mg/g, respectively, compared to 17.48, 14.18 and 11.85 mg/g for raw N. zanardini biomass. Also, adsorption of Pb(II), Cd(II) and Cr(VI) by the modified S. Marginatum was found to be 17.54, 15.62 and 14.77 mg/g, respectively, in comparison with that of the raw biomass which were 16.86, 12.9 and 11.2 mg/g. The obtained results of the equilibrium adsorption were studied through different isotherm models of Langmuir, Freundlich and Temkin, where the Langmuir model was observed to agree well with the results. Prevalent kinetic models including pseudo-second order and intra-particle diffusion were applied, and the pseudo-second order was found to describe the adsorption kinetics data adequately. Intra-particle model was also utilized in order to show penetration of metal ions, where it was realized that the biosorption took place in two or three steps including film diffusion, molecular diffusion and chemical reaction. |
Databáze: | OpenAIRE |
Externí odkaz: |