A comparative study on fly ash, geopolymer and faujasite block for Pb removal from aqueous solution

Liu, Yi and Yan, Chunjie and Zhang, Zuhua and Wang, Hongquan and Zhou, Sen and Zhou, Wei (2016) A comparative study on fly ash, geopolymer and faujasite block for Pb removal from aqueous solution. Fuel, 185. pp. 181-189. ISSN 0016-2361


This work aims to evaluate the efficiencies of fly ash, fly ash-based geopolymer and faujasite block, which is transformed from geopolymer, as sorbents for lead (Pb) from aqueous solutions. Comparative experiments were performed to examine the mineralogical features of the fly ash, geopolymer and faujasite block and their adsorption capacities. Equilibrium isotherms and thermodynamic parameters were obtained through systematic investigation of parameters including pH, initial Pb concentration, temperature and contact time. The adsorption kinetics of geopolymer and faujasite block fit well to the pseudo-second-order kinetic model, while the adsorption of fly ash fit to the pseudo-first-order kinetic model. The adsorption equilibrium data of fly ash, geopolymer and faujasite can be expressed using Langmuir model. The maximum adsorption capacities of fly ash, geopolymer and faujasite block at pH = 3 were determined to be 49.8, 118.6 and 143.3 mg/g, respectively. Through this study we demonstrate that both geopolymer and faujasite can effectively remove Pb from wastewater. Most importantly, we prove that geopolymer has the same adsorption mechanisms as faujasite or similar zeolite materials. This finding suggests geopolymer technology being an energy-saving, low cost and environmentally friendly process in adsorbent manufacturing.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 03 Apr 2017 04:31
Last Modified: 03 Apr 2017 04:31
Uncontrolled Keywords: adsorption; absorbent; fly ash; geopolymer; faujasite; lead
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091299 Materials Engineering not elsewhere classified
09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
03 Chemical Sciences > 0302 Inorganic Chemistry > 030203 Inorganic Green Chemistry
Socio-Economic Objective: B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials
Funding Details:
Identification Number or DOI: 10.1016/j.fuel.2016.07.116
URI: http://eprints.usq.edu.au/id/eprint/31066

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