Use of Silica Fume as Low-Cost Absorbent Material for Nickel Removal from Aqueous Solutions

Abstract

The presence of heavy metals in the aquatic ecosystem causes harmful effects to living organisms and causes environmental hazards 1. Inorganic effluents contaminate wastewater with toxic metals such as Ni, Cr, Cd, Hg, Pb and Zn 2-4. These heavy metals are extremely toxic, non-biodegradable and accumulate in the food chain, even in relatively minute quantities. Thus, industries such as electroplating, aerospace and metal finishing are among the most hazardous from a wastewater viewpoint 5-6. For the past several years, high levels of heavy metals in drinking water and foods have been associated with several acute and chronic illnesses in humans throughout the world 7,8. Water pollution is the contamination of water bodies such as lakes, rivers, oceans and groundwater caused by human activities, which can be harmful to organisms and plants, present in water bodies. The presence of heavy metals in streams, lakes and groundwater reservoirs has been responsible for several health problems with plants, animals and human beings 9. Heavy metal contamination exists in aqueous waste stream from many industries such as metal plating, mining, tanneries, painting, car radiator manufacturing, as well as agricultural sources where fertilizers and fungicidal spray are intensively used 10-12. Nickel ion is one such heavy metal frequently encountered in raw wastewater streams from industries, such as non-ferrous

Sodium Alginate/β-Cyclodextrin Reinforced Carbon Nanotubes Hydrogel as Alternative Adsorbent for Nickel(II) Metal Ion Removal

“…However, due to the intrinsic parameters of the Langmuir isotherm model, plots gave a negative value of Langmuir constant, b, and the calculated maximum adsorption capacity, Q m, for Ni, as listed in Table 2. The results demonstrate that the Langmuir isotherm model was unsuitable to describe the adsorption process, as the adsorption behavior on the tested system was not following the assumption of the Langmuir isotherm approach [77]. In this context, the Freundlich model was suggested and more fitted to describe the isotherm of the Ni(II) adsorption on SA-β-CD/CNTs hydrogel.…”

RSM Optimization of Direct Orange 26 Adsorption on Low-Cost Silica Fume Adsorbent

“…Wang et al (2011) found that the performance of silica fume in adsorption of Rhodamine B from aqueous solutions is better than from coal ash (Wang & Chu, 2011). Kalkan et al (2014) found silica fume has a high capacity to adsorb nickel (Kalkan, Nadaroglu, & Celebi, 2014). Nadaroglu et al (2013) and Ahmed et al (2015) showed that silica fume is a cheap and effective adsorbent for the removal of cadmium (II) and copper and zinc ions from wastewater (Ahmed et al, 2017;.…”

Study on melamine/bentonite polyurethane porous composite foam: Pb2+ adsorption and mechanical properties

“…Baraka et al studied heavy metal removal of melamine‐formaldehyde‐dietheylenetriaminepentaacetic acid, and found its absorption mechanism was attributed to the chelate between amino and divalent toxic metal ions 10 . Furthermore, clay, 11 and silicates are the low‐cost adsorbent, 12‐14 including micritic limestone, 15 zeolite, 16 bentonite. Therein, bentonite is a clay type consisting of montmorillonite primarily, comparatively cheaper and commonly used adsorbent because of its unique high surface area and high ion exchange rate, thereby gaining increasing attention in wastewater treatment in recent years 17,18 .…”