Nano-Sized Adsorbent from Pyrolysed Sago Activated Sludge for Removal of Pb(II) from Aqueous Solution
Increased disposal of heavy metals, including lead (II) (Pb(II)) into the environment calls for a reliable and sustainable solution. In this study, nano-sized biochar from sago activated sludge was proposed for the removal of Pb(II). Sago activated sludge was pyrolysed in a tube furnace followed by...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | en |
| Published: |
Universiti Putra Malaysia Press
2020
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/47814/1/Nano-Sized%20Adsorbent.pdf http://ir.unimas.my/id/eprint/47814/ http://www.pertanika.upm.edu.my/resources/files/Pertanika%20PAPERS/JST%20Vol.%2028%20(3)%20Jul.%202020/08%20JST-1917-2020.pdf |
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| Summary: | Increased disposal of heavy metals, including lead (II) (Pb(II)) into the environment calls for a reliable and sustainable solution. In this study, nano-sized biochar from sago activated sludge was proposed for the removal of Pb(II). Sago activated sludge was pyrolysed in
a tube furnace followed by a chemical activation to yield nano-sized particles ranging from 45 to 75 nm. The nano-sized biochar obtained was characterised and the influence
of pH (2 – 10), initial Pb(II) concentration (1 – 5 mg/L), contact time (30 – 90 mins) and adsorbent dosage (0.1 – 0.5 g) was investigated in a batch adsorption study. Response
surface methodology (RSM) approach with central composite design (CCD) was used as statistical tools to optimize the adsorption process by relating the mutual interactions
among all studied variables. Characterisation of the prepared adsorbent showed that large surface area was observed on sludge activated carbon (78.863 m2
/g) compared with sludge biochar (8.044 m2/g) and sludge biomass (1.303 m2 /g). The batch adsorption best fitted
the Langmuir isotherm (maximum adsorption capacity, Q0 = 3.202 × 10-3 mg/g, R-squared value = 0.9308). The RSM indicated that the optimum Pb(II) removal (99.87%) was at 0.5 g of adsorbent, 5 mg/L initial concentration
and 30 min contact time. This study is significant because utilisation of sago effluent will reduce sago manufacturing
waste by conversion into a value-added product as adsorbent to adsorb Pb(II) in wastewater. |
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