Removal Of Copper (II) And Nickel (II) In Aqueous Solution By Modified Rhizophora Apiculata Barks Adsorbent
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Date
2012-07
Authors
Che Amat, Rozaini
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Waste mangrove barks of Rhizophora apiculata has been chemically modified in different
conditions to be used as adsorbents to remove Cu(II) and Ni(II) ions from aqueous solution.
Rhizophora apiculata bark mainly consists of 53% cellulose, 48% lignin, 46% extractive and
13% ash content.Chemical modifications were done using formaldehyde as cross linking
agent in acidic and basic conditions. The adsorbents were chemically and physically
characterised by FTIR spectroscopy, pHzpc and BET analysis shows that the adsorbent
produced are insoluble in water and have micro porous texture. The effects of pH, initial
heavy metal ion concentration, adsorbent dosage, contact time and temperature on the
removal of Cu(II) and Ni(II) were studied with equilibrium was established after shaking for
60 min using 1 g of adsorbent dosage at pH 5. Changes in the texture surface of the adsorbent
were evaluated by using scanning electron microscopy after modification process. The
adsorption process was described well by the Freundlich isotherm models with monolayer
adsorption capacity of Ni(II) was 6.16 mg g-1 and 5.80 mg g-1 for acidic condition and basic
condition, respectively. Meanwhile the monolayer adsorption capacity of Cu(II) was 1.50 mg
g-1 and 11.67 mg g-1 for acidic condition and basic condition, respectively. Kinetics data were
best described by pseudo-second order model. Thermodynamic parameters showed that the
adsorption of Cu(II) and Ni(II) ions onto modified Rhizophora apiculata barks were
spontaneous and endothermic. MBA and MBB may be applied for removal of electroplating
wastewater with 65% removal efficiency.
Description
Keywords
Removal of copper (II) and nickel (II) in aqueous solution , modified Rhizophora apiculata barks adsorbent