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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/128653
Title: 
Characterization of corn (Zea mays) leaf powder and Its adsorption properties regarding Cu(II) and Cd(II) from aqueous samples
Author(s): 
Institution: 
  • Universidade Estadual Paulista (UNESP)
  • Universidade de São Paulo (USP)
  • Universidade Federal de Mato Grosso do Sul (UFMS)
ISSN: 
1930-2126
Sponsorship: 
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Sponsorship Process Number: 
  • FAPESP: 2013/22955-2
  • FAPESP: 2012/21795-9
  • CNPq: 302284/2012-5
Abstract: 
In this study, a green adsorbent made of corn leaf powder was applied in the removal of Cu(II) and Cd(II) from water samples. The material was characterized by Fourier transform infrared (FTIR) spectroscopy, which indicated the existence of amine (1375 and 1249 cm(-1)) and carboxylic groups (1730 cm(-1)). Elemental analysis corroborated the results of FTIR, indicating that the substance consisted of 0.63% sulfur and 0.46% nitrogen. The NMR results indicated that thiamine and methionine may be present in the corn leaf substances, which can act in coordination with metal species. Scanning electron microscopy (SEM) indicated the existence of pores of approximately 15 mu m in diameter and a homogeneous particle size. Equilibrium adsorption was attained in 5 min, and the obtained data were applied to a pseudo-second-order kinetic model (r(2) = 0.999 for Cu(II) and Cd(II)). Selective adsorption of Cu(II) was attained at pH 3.0, and the maximum adsorption capacities were attained at pH 6.0. Adsorption isotherms were adjusted to a modified Langmuir equation and the maximum number of moles adsorbed of Cu(II) and Cd(II) were 0.089 and 0.071 mmol g(-1), respectively. The results are superior to many materials currently employed in metal removal from aqueous samples.
Issue Date: 
1-Jan-2015
Citation: 
Bioresources. Raleigh: North Carolina State Univ Dept Wood &paper Sci, v. 10, n. 1, p. 1099-1114, 2015.
Time Duration: 
1099-1114
Publisher: 
North Carolina State Univ Dept Wood &paper Sci
Keywords: 
  • Corn leaf powder
  • Heavy metal ions
  • Metal-surface interaction
  • Adsorption
Source: 
http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_10_1_1099_Silva_Corn_Leaf_Powder_Adsorption
URI: 
Access Rights: 
Acesso aberto
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/128653
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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