Several types of red mud-based porous materials (RMPM) and other raw minerals via different processes were prepared and characterized using X-ray diffraction (XRD) analyses and scanning electron microscope (SEM) observations. Using the polymer sponge method, a 72% apparent porosity could be reached compared with 64% by adding a pore-forming agent. These materials were tested for their adsorption of polyvinyl alcohol (PVA) from simulated textile wastewater. The best mass ratio of RMPM to PVA solution was 50:100 with a removal maximum of 25.8% after they were in contact for 50 min. The adsorption rate and kinetics could be better described by Lagergren's pseudo-second-order model in comparison with the pseudo-first-order model.
Adsorption of polyvinyl alcohol from wastewater by sintered porous red mud
Yihe Zhang, Wei Chen, Guocheng Lv, Fengzhu Lv, Paul K. Chu, Wenmin Guo, Baolin Cui, Rui Zhang, Hell Wang; Adsorption of polyvinyl alcohol from wastewater by sintered porous red mud. Water Sci Technol 1 June 2012; 65 (11): 2055–2060. doi: https://doi.org/10.2166/wst.2012.114
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