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Multistage optimizations of slow pyrolysis synthesis of biochar from palm oil sludge for adsorption of lead.
- Source :
-
Bioresource Technology . Dec2017 Part A, Vol. 245, p944-953. 10p. - Publication Year :
- 2017
-
Abstract
- This research investigated the removal of lead (Pb 2+ ) by a novel biochar derived from palm oil sludge (POS-char) by slow pyrolysis. Multistage optimizations with central composite design were carried out to firstly optimize pyrolysis parameters to produce the best POS-char for Pb 2+ removal and secondly to optimize adsorption conditions for the highest removal of Pb 2+ . The optimum pyrolysis parameters were nitrogen flowrate of 30 mL min −1 , heating rate of 10 °C min −1 , temperature of 500 °C and time of 30 min. The optimum Pb 2+ adsorption conditions were concentration of 200 mg L −1 , time of 60 min, dosage of 0.3 g and pH of 3.02. The various functional groups within POS-char played a vital role in Pb 2+ uptake. Regeneration was demonstrated to be feasible using hydrochloric acid. Adsorption equilibrium was best described by Freundlich model. At low concentration range, adsorption kinetic obeyed pseudo-first-order model, but at high concentration range, it followed pseudo-second-order model. Overall, the results highlighted that POS-char is an effective adsorbent for Pb 2+ removal. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PALM oil
*BIOCHAR
*PROCESS optimization
*ADSORPTION (Chemistry)
*LEAD
*PYROLYSIS
Subjects
Details
- Language :
- English
- ISSN :
- 09608524
- Volume :
- 245
- Database :
- Academic Search Index
- Journal :
- Bioresource Technology
- Publication Type :
- Academic Journal
- Accession number :
- 125526652
- Full Text :
- https://doi.org/10.1016/j.biortech.2017.08.175