Adsorption of rhodamine B and methylene blue dyes using waste of seeds of Aleurites Moluccana, a low cost adsorbent

Autor: Danielle Caroline Cipriani Melo, Francielle Zanatta, Clóvis Antonio Rodrigues, Debora Luiza Postai, Carla Albertina Demarchi
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Thermogravimetric analysis
Langmuir
Engineering
Chemical
Engineering
Civil
Aleurites moluccana
02 engineering and technology
010501 environmental sciences
01 natural sciences
Physics
Applied
chemistry.chemical_compound
Adsorption
Cationic dye
Architecture
Rhodamine B
Freundlich equation
Materials Science
Textiles
Point of zero charge
Fourier transform infrared spectroscopy
Engineering(all)
0105 earth and related environmental sciences
Waste management
General Engineering
Engineering
Environmental
Sorption
Engineering
Electrical & Electronic
021001 nanoscience & nanotechnology
Engineering (General). Civil engineering (General)
Engineering
Marine
Engineering
Mechanical
Physics
Nuclear
Low cost adsorbent
chemistry
Computer Science
Interdisciplinary Applications
TA1-2040
0210 nano-technology
Nuclear chemistry
Zdroj: Alexandria Engineering Journal, Vol 55, Iss 2, Pp 1713-1723 (2016)
Scipedia Open Access
Scipedia SL
ISSN: 1110-0168
Popis: Removal of the cationic dyes rhodamine B (RhB) and methylene blue (MB) by waste seeds Aleurites moluccana (WAM) was studied in a batch system. The adsorbent was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), point of zero charge measurement, and the Boehm titration method. The effects of contact time and pH were investigated for the removal of cationic dyes. An increase in pH from 3 to 9 was accompanied by an approximately three-fold increase in the amount of dye adsorbed. The adsorptions equilibrium values were obtained and analyzed using the Langmuir, Freundlich, Sips, and Redlich–Peterson equations, the Sips isotherm being the one that showed the best correlation with the experimental values. The maximum adsorption capacities of the dyes were 178 mg/g for the MB and 117 mg/g for the RhB. The kinetic sorption was evaluated by the pseudo-first-order, pseudo-second-order, and intraparticle diffusion models, where it was observed that sorption follows the pseudo-second-order kinetic model. The study of thermodynamics showed that the adsorption is a spontaneous and endothermic process. The results indicate that waste seeds of A. moluccana could be used as a low cost material for the removal of cationic dyes from wastewater.
Databáze: OpenAIRE
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