Adsorption of methylene blue from aqueous solution using untreated and treated (Metroxylon spp.) waste adsorbent: equilibrium and kinetics studies
Background (Metroxylon spp.) waste is an inexpensive and abundantly available material with the characteristics of a good adsorbent for treating dye from wastewater. We studied the effectiveness of alkali and acid modification in enhancing the adsorption capacity of sago waste. The untreated and...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
2016
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/55042/ http://irep.iium.edu.my/55042/ http://irep.iium.edu.my/55042/ http://irep.iium.edu.my/55042/1/Paper%20AC%20Jaminat.pdf http://irep.iium.edu.my/55042/7/55042_Adsorption%20of%20methylene_wos.pdf |
| Summary: | Background (Metroxylon spp.) waste is an inexpensive
and abundantly available material with the characteristics
of a good adsorbent for treating dye from wastewater. We
studied the effectiveness of alkali and acid modification in
enhancing the adsorption capacity of sago waste. The
untreated and treated adsorbent was characterized by FTIR,
elemental analysis and BET surface area. The capacity of
each adsorbent to adsorb MB was evaluated at different pH
values, adsorbent dosage and initial dye concentrations and
contact time.
Results According to the results obtained, alkali treatment
more than doubled the sorption capacity of sago waste by
increasing the porosity, surface area and number of adsorption
sites. The alkali-treated material also adsorbed significantly
more than many known biosorbents. The effects of the
initial concentration of methylene blue, solution pH and
adsorbent dosage on methylene blue removal are reported.
Equilibrium data were best represented by the Langmuir
isothermmodel with adsorption capacities of 83.5, 212.8 and
36.82 mg/g for untreated, potassium hydroxide-treated and
phosphoric acid-treated sago wastes, respectively. The
kinetics of adsorption were best described by a pseudo-second-order
model (R2 = 0.999). Conclusions The alkali treatment of sago waste demonstrates the use of a low-cost agricultural waste and a simple |
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