Use of modified bauxite residue-based porous inorganic polymer monoliths as adsorbents of methylene blue
authors Hertel, T; Novais, RM; Alarcon, RM; Labrincha, JA; Pontikes, Y
nationality International
journal JOURNAL OF CLEANER PRODUCTION
author keywords Bauxite residue; Red mud; Porosity; Inorganic polymer; Wastewater treatment; Adsorption
keywords WASTE-WATER TREATMENT; ASH-BASED GEOPOLYMER; LOW-COST ADSORBENTS; FLY-ASH; ACTIVATED CARBON; DYE REMOVAL; AQUEOUS-SOLUTION; RED MUD; ADSORPTION; COMPOSITES
abstract Porous inorganic polymer (IP) monoliths were synthesised using a modified bauxite residue (BR) as the reactive fraction with the objective of using them as adsorbents for methylene blue (MB) from synthetic wastewater. First, unreactive, as-produced BR was transformed into a suitable glassy precursor material for IPs by blending BR with minor quantities of C and CaSiO3, thermally treating it at 1200 degrees C for 2 h, and quenching in water. The alkaline activation of this slag in combination with a pore foaming agent led to the formation of a highly porous microstructure with up to 85% in total porosity. The synthesised porous monoliths demonstrated high MB uptake (up to 17 mg of MB/g of IP with an initial MB concentration of 75 mg/L). A higher porosity of the monoliths, a higher pH, an increasing initial MB concentration as well as stirring of the testing solution have a positive effect on the adsorption capacity, while an optimum solution volume for adsorption was identified. Furthermore, the reuse of these novel monolithic adsorbents was demonstrated by repeating adsorption tests up to five cycles (adsorption-desorption), with a decrease in adsorption capacity of approximately 30%, but a promising cumulative uptake of about 40 mg of MB per g IP. (C) 2019 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0959-6526
year published 2019
volume 227
beginning page 877
ending page 889
digital object identifier (doi) 10.1016/j.jclepro.2019.04.084
web of science category Green & Sustainable Science & Technology; Engineering, Environmental; Environmental Sciences
subject category Science & Technology - Other Topics; Engineering; Environmental Sciences & Ecology
unique article identifier WOS:000470939600078
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