Physicochemical characterization of natural dolomite for efficient removal of lead and cadmium in aqueous systems

Abstract

Physicochemical characterization of naturally abundant carbonates has been undertaken to evaluate their potentialities in the removal of lead and cadmium ions in aqueous systems. Powdered dolomite samples, collected from the Jebel Rehach location, southern Tunisia, were used in their natural form for the removal of both cadmium and lead in aqueous conditions. The removal experiments were carried out in batch by mixing known amount of dolomite powder with a metal solution (lead or cadmium). The mixture was shaken at 200 rpm under the experimental conditions of pH 6, temperature (25°C), dolomite concentration 3 g/L, and cadmium 10 mg/L and lead 100 mg/L solutions. Shaking time was 60 min. Our results showed that the studied dolomite samples were mainly composed of calcium and magnesium oxides; other impurities were also detected. Adsorption data showed that dolomitic samples of the Triassic Rehach formation (southern Tunisia) removed substantial amounts of lead and cadmium ions in aqueous systems. It was found that lead removal efficiency reached 24.80 and 33.25 mg/g, which is much higher than that of cadmium (1.31–1.77 mg/g). It was also observed that more than 95% of the total adsorptive capacity was achieved after 30 min of agitation, but 60 min was used to ensure equilibration time. These results suggested that the Triassic Rehach dolomite, Tunisia, can be effectively used for capturing lead and cadmium ions in aqueous conditions. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018

Dolomite dust filled glass fiber reinforced epoxy composite: Influence of fabrication techniques on physicomechanical and erosion wear properties

“…[27] Furthermore, the mean of S/N ratio was found to decrease with impingement angle, suggesting that the means of erosion rate increases with increased impingement angle. As observed from figures for hand layup and VRTM based composites, the erosion wear remained lowest for smaller impingement angles (30 ) and attained the highest values at 90 of impingement angle, indicating F I G U R E 9 Interaction plot of S/N ratio for hand layup technique brittle erosion behavior. Similar results were reported for polymer composites by Öztürk et al [27] and Barkoula et al, [41] where maximum erosion wear was observed at 90 of impingement angle.…”

“…The impingement angle, impact velocity, and erodent size are the most studied factors that significantly influence erosion behavior. It was well documented in the literature that erosion wear remains highest for ductile and brittle materials at low (15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30) and high (90 ) impingement angles, respectively. [27] In comparison, erosion wear is found to increase with an increase in impact velocity and erodent size.…”

“…[28,29] Dolomite is reported to be used in numerous applications, including manufacturing tiles and glass, producing magnesium as a construction material, removing cadmium, and lead from aqueous systems and geopolymer foams. [28][29][30] Conversely, the literature towards the utilization of dolomite in polymeric composites is quite limited. Ali et al [31] reported that composite based on polyether polyurethane with dolomite filler significantly affected the evaluated mechanical (shore hardness, elongation tensile, and compression strength) properties.…”

Removal of Cr3+ ions by phytic acid derivatives from rice bran

“…Various artificial and natural porous materials having developed specific surface area are used to remove cations of toxic metal from aquatic media, including zeolites (Aljerf 2018), carbon-containing terpels (Shashkova et al 2001), dolomites (Sdiri 2018), and carbon sorbents based on vegetable and animal raw materials (Pakshirajan et al 2013;Elabbas et al 2015). When treating wastewater containing heavy metal ions, the main practical task is to select local materials that are of a low cost but effective.…”

Green approaches for materials, wastes, and effluents treatment

“…On the other hands, effluents discharge into municipal sewers by mining, metallurgy, electroplating, electronics, textile, nuclear, and other industrial effluents have become serious threats to the receiving environment. Therefore, controlling those effluents is of outmost importance (Yang et al 2013;Sdiri et al 2018;Sdiri 2018). A number of technologies have been developed for the removal and recovery of various pollutants including filtration, chemical precipitation, ion exchange, adsorption, electrodeposition, and membrane systems (Kesraoui et al 2016;Othmani et al 2017).…”