Use of red mud activated at different temperatures as a low cost adsorbent of reactive dye

Abstract

Red mud, a waste product generated during alumina extraction from bauxite, could be used as a low-cost adsorbent. Here, the effect of thermal treatment on the adsorption of Reactive Blue 19 (RB19) dye by red mud was compared with the adsorption capacity of untreated red mud. Thermal treatment of red mud at 500°C results in an increase in adsorption capacity from 357 mg g-1 (untreated red mud) to 416 mg g-1, under acidic conditions. Red mud samples thermally treated at 600°C and 800°C show a reduction in adsorption capacity, however, falling to 337 mg g-1, in acid medium. The change in the maximum adsorption capacity of red mud to RB19 following thermal treatment is associated with specific surface area. Red mud subjected to 500°C can be used for the treatment of water and wastewaters with a higher efficiency than untreated red mud, thus finding possible application in the textile industry.

Evaluation of the Kinetics of Adsorption of Methylene Blue Dye on Low Cost Ceramic Membranes Characterized with Waste from the Bayer Process

“…The XRD of clay from the Paracuri-PA region (Figure 7) points to major peaks of Quartz (67%), Muscovite (21%) and Kaolinite (12%), compatible with results found in the literature (SILVA et al, 2013 ;MACHADO et al, 2019;SANTOS et al, 2011). The mineral composition for both raw materials was quantified by the Rietveld Technique (ANTONIANNE, 2010;KONIG et al, 2002;NEUMANN et al, 2015).…”

“…The highest value of adsorption capacity () was obtained with the 65AGL/35LV membrane (950° C). According to Antunes et al, (2017), it is noticed that with the increase in temperature, there is a partial decomposition of the sodalite mineral phase, which may be the factor responsible for the non-adsorption of the compositions at 1000 °C.𝑞 𝑚…”

Investigation on Properties and Heavy Metal Ion Extraction of Thermally Activated Red Mud Incorporated Cement Mortar

“…However, when considering calcined red mud, CO 2 emission is more prominent. Calcination above 750ºC possesses decarbonation of calcite to quick lime and CO 2 [4][5][6]. Thus, it would adversely affect the Global Warming Potential, Cumulative Energy Demand, and the emission of major air pollutants (CO, NO X , PM 10 , and SO 2 ) adversely [7].…”