Open AccessAdsorption of Pb (II) Using Partially Deproteinated Water Hyacinth (Eichhornia crassipes) Roots
Author(s) -
Aileen D. Nieva,
MH Ang,
H. G. Hipolito,
Enrique Calderón,
Kristopher Ray S. Pamintuan
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/563/1/012009
Subject(s) - eichhornia crassipes , hyacinth , chemistry , adsorption , aqueous solution , desorption , effluent , nuclear chemistry , sorbent , biosorption , wastewater , environmental chemistry , chromatography , environmental engineering , aquatic plant , sorption , organic chemistry , ecology , macrophyte , engineering , biology
Water hyacinth ( Eichhornia crassipes ) is known to be an effective biosorbent capable of removing pollutants of industrial wastewater effluents, particularly heavy metals. This study determined and compared the effectiveness of removing Pb 2+ in a lead-containing aqueous solution using untreated and treated water hyacinth roots. The treated biosorbent was the heavy organic matter that settled from the extraction of water-soluble portions of the water hyacinth roots upon centrifugation of the water hyacinth and deionized water mixture for 1 hour at ambient temperature. The treatment of the biosorbent resulted to less functional groups but more exposed fibers for which the Pb 2+ ions can adhere to. At a 24-hour equilibrium time, it was determined that the untreated biosorbent gave higher adsorption capacity of 0.743 mg/g as compared to the 0.653 mg/g capacity of the treated biosorbent. However, it was observed that in a 2-hour equilibrium time, similar adsorption capacities were obtained at 0.75 mg/g for both biosorbents. The kinetic study reveals that saturation of the biosorbents was observed within a 2-hour contact time. At prolonged adsorption time, the decrease in adsorption capacity of the treated biosorbent was due to the adsorption-desorption process that occurred at the saturated sorbent surfaces, whereby the attached Pb 2+ was released and re-attached interchangeably. The loss of functional groups in the treated biosorbent resulted to less strong bonds from chemical adsorption and thus in a higher contact time, the loosely binded Pb 2+ ions return to the aqueous phase.