Mesoporous activated carbon prepared from macadamia nut shell waste by carbon dioxide activation: comparative characterisation and study of methylene blue removal from aqueous solution

Wongcharee, Surachai and Aravinthan, Vasantha and Erdei, Laszlo and Sanongraj, Wipada (2018) Mesoporous activated carbon prepared from macadamia nut shell waste by carbon dioxide activation: comparative characterisation and study of methylene blue removal from aqueous solution. Asia-Pacific Journal of Chemical Engineering (e2179). pp. 1-16. ISSN 1932-2143

Abstract

Activated carbons are the most widely used adsorbents; however, producing high‐performance mesoporous activated carbons with simple technology still remains a challenge. In this research, waste macadamia nut shell (MNS) was explored as precursor for preparing mesoporous activated carbons by carbon dioxide activation. The material characteristics of MNS‐based activated carbon (MAC) were thoroughly examined in comparison with a premium‐grade commercial activated carbon (CAC). MAC and CAC had specific surface areas of 830 and 1,299 m2 g−1, respectively. Although CAC had a predominantly microporous structure, about 74% of the pore volume of MAC is composed of mesopores. Adsorption performances were evaluated in batch experiments using methylene blue model pollutant and demonstrated 135 and 181 mg g−1 saturation capacities for MAC and CAC, respectively. Non‐linear regression found that the fractal‐like pseudo first‐order model accurately described sorption kinetics, and intraparticle diffusion was the rate‐limiting step. Among 6 established isotherm models, the Liu equilibrium model showed the best statistics. Thermodynamic analysis verified that the process was favourable and involved physisorption. These results show that valuable mesoporous activated carbons can be prepared from the biowaste MNS with simple production technology to suit environmental and industrial applications.


Statistics for USQ ePrint 33699
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published online 13 February 2018. Permanent restricted access to ArticleFirst version, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 20 Feb 2018 00:03
Last Modified: 14 May 2018 23:45
Uncontrolled Keywords: adsorption, macadamia nut shell, mesoporous activated carbon, methylene blue, non‐linear modelling
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091299 Materials Engineering not elsewhere classified
09 Engineering > 0904 Chemical Engineering > 090410 Water Treatment Processes
05 Environmental Sciences > 0502 Environmental Science and Management > 050205 Environmental Management
Identification Number or DOI: 10.1002/apj.2179
URI: http://eprints.usq.edu.au/id/eprint/33699

Actions (login required)

View Item Archive Repository Staff Only