Abstract：
:The properties of biochar derived from waste activated sludge and anaerobic digestion sludge under pyrolysis temperature varying from 400°C to 800°C were investigated. The heavy metals adsorption efficiency of the sludge-derived biochar was also examined. Among the biochar samples tested, ADSBC600 possessing highly porous structure, special surface chemical behaviors and high thermal stability was found to remove Pb2+ from aqueous solutions efficiently with an adsorption capacity of 51.20mg/g. The Pb2+ adsorption kinetics and isotherm for ADSBC600 can be described using the pseudo second-order model and Langmuir isotherm, respectively. Analysis of the characteristics of biochar before and after metal treatment suggests that electrostatic attraction, precipitation, surface complexation and ion exchange are the possible Pb2+ removal mechanisms. This study demonstrates a successful example of waste refinery by converting anaerobic digestion sludge to feasible heavy metal adsorbents to implement the concept of circular economy.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Ho SH,Chen YD,Yang ZK,Nagarajan D,Chang JS,Ren NQdoi
10.1016/j.biortech.2017.08.025subject
Has Abstractpub_date
2017-12-01 00:00:00pages
142-149eissn
0960-8524issn
1873-2976pii
S0960-8524(17)31330-5journal_volume
246pub_type
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