TY - JOUR
T1 - Uncommon crop residues as Ni(II) and Cd(II) biosorbents
AU - Correa, María L.
AU - Velásquez, Jorge A.
AU - Quintana, Germán C.
PY - 2012/9/26
Y1 - 2012/9/26
N2 - Four residues of uncommon crops-Coffea arabica fruit endocarp, coconut fruit endocarp, Eichhornia crassipes weed (EC), and Guadua angustifolia plant?and a commercial activated carbon (CA) are evaluated as Ni(II) and Cd(II) biosorbents. These materials are chosen for their abundance and economic importance in Colombia. Surface functional groups containing oxygen, such as carboxylic, lactonic, and phenolic, are quantified using the Boehm's method. The Ni(II) and Cd(II) adsorption are determined from dose curves. The highest removal percentage is obtained using EC: 74.31% and 95.77% for Ni(II) and Cd(II), respectively. The equilibrium isotherms are constructed at 28 °C and pH 6.6. The results are adjusted to the Langmuir model by nonlinear regression, showing a good fit, with R 2 above 95%. The highest maximum adsorption capacity (X mL) is found with EC: 17.47 mg Ni(II)/g EC and 32.82 mg Cd(II)/g EC. The trend in the estimated X mL values is found to be consistent with their contents of total acidic surface functional groups. It is concluded that these lignocellulosic materials, without chemical and physic treatment, behave similarly or even equal to the CA.
AB - Four residues of uncommon crops-Coffea arabica fruit endocarp, coconut fruit endocarp, Eichhornia crassipes weed (EC), and Guadua angustifolia plant?and a commercial activated carbon (CA) are evaluated as Ni(II) and Cd(II) biosorbents. These materials are chosen for their abundance and economic importance in Colombia. Surface functional groups containing oxygen, such as carboxylic, lactonic, and phenolic, are quantified using the Boehm's method. The Ni(II) and Cd(II) adsorption are determined from dose curves. The highest removal percentage is obtained using EC: 74.31% and 95.77% for Ni(II) and Cd(II), respectively. The equilibrium isotherms are constructed at 28 °C and pH 6.6. The results are adjusted to the Langmuir model by nonlinear regression, showing a good fit, with R 2 above 95%. The highest maximum adsorption capacity (X mL) is found with EC: 17.47 mg Ni(II)/g EC and 32.82 mg Cd(II)/g EC. The trend in the estimated X mL values is found to be consistent with their contents of total acidic surface functional groups. It is concluded that these lignocellulosic materials, without chemical and physic treatment, behave similarly or even equal to the CA.
UR - http://www.scopus.com/inward/record.url?scp=84867543613&partnerID=8YFLogxK
U2 - 10.1021/ie301156y
DO - 10.1021/ie301156y
M3 - Artículo en revista científica indexada
AN - SCOPUS:84867543613
SN - 0888-5885
VL - 51
SP - 12456
EP - 12462
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 38
ER -