Recent potential application of rice husk as an eco-friendly adsorbent for removal of heavy metals

Abstract

Environmental contamination by heavy metals has continued to be a source of serious concerns to researchers because of its far-reaching implications on the earth as we know it. This is because environmental pollution occasioned by heavy metals (HMs) which are non-biodegradable pose direct or indirect negative effects on environmental health, including that of plants, animals, and humans owing to their increased bioaccumulation in environmental matrices. Wastewater from industries producing chemicals is disposed of directly without proper treatment into the environment. However, HMs enter the food chains and food webs via the air, water, and soil, thereby inducing several diseases and disorders in both humans and animals. The features of rice husk (RH) as novel adsorbent are because it is chemically stable as well as being insoluble in water in addition to its large surface area relative to other agricultural waste products. There is an increasingly high awareness of the roles played by RH in environmental uses or applications for the sequestration of environmentally harmful chemical substances This review summarizes some recent developments in the use of RH and its derivatives as an environmentally friendly adsorbent that is highly suitable for the removal of heavy metal.

The Bod-Cod Reduction in Leachate Water Using Rice Husk Ash

“…It is composed of 90% Si2O, 1.48% CaO, 1.23% MgO, 1.09% MnO, 1.54% Fe3O3, and 1.21% Al2O3. The nature of rice husk ash has been reported to strongly depend on the ash chemical composition which is predominantly silica (Okoro et al, 2022).…”

Gum katira-silver nanoparticle-based bionanocomposite for the removal of methyl red dye

“…Owing to advancements in lifestyle, industrial activities have increased at a great pace and the environment has gravely depreciated as a result, particularly the aquatic environment. Toxic organic pollutants from industrial effluents damage the environment, and dyes are the foremost pollutants that contaminate water bodies and are easily recognizable by eye (Gupta, 2009;Okoro et al, 2022). As these dyes have harmful impacts on every type of life, their removal is an urgent matter of concern (Adesina et al, 2015;Saruchi et al, 2020).…”

Removal of chromium from tannery wastewater by rice husk ash nanosilica

“…It does not require much energy for the preparation of nanosilica and high purity was obtained directly. Rice husk silica was used for the removal of lead heavy metal 98% respectively at room temperature and also Hussein K. Okoro explained in his review with the collected results, which proved several metal ions were removed by using rice husk silica adsorbent [10]. This study is overall focused on removal of Cr(VI) from the tannery industrial wastewater using rice husk nanosilica.…”