Abstract
Industrial and drinking water polluted by Cr(VI) ions is a worldwide problem. This polluted water causes harmful effect to the environment. Hence, removal of Cr(VI) ions from polluted water is a challenging task to achieve a healthy and safe environment. Adsorption is a widely used method to remove chromium (Cr) ions from polluted water due to simple setup, low cost, environmentally friendly, and highly efficient. For the adsorption process, a suitable adsorbent is required with a focus on morphology, stability, and surface properties. Graphene oxide (GO) is a 2D carbon-based material having different oxygen-containing functional groups (hydroxyl, epoxy, carboxyl), high surface area, and high chemical and thermal stability. Due to these outstanding properties, GO and its composite materials have been effectively used for removing Cr(VI) ions from water. Recent research has focused to develop different metal oxide nanomaterials decorated with GO and applied for the adsorption of Cr(VI) ions to increase the adsorption efficiency. This chapter basically focuses on the synthesis of different metal oxide nanomaterials, mostly iron-, zinc-, silicon-, and manganese-functionalized GO. The adsorption of Cr(VI) ions using GO-based metal oxide nanomaterials from water is briefly summarized. The adsorption affinity, processes, sorption capacity parameters, and mechanism for Cr(VI) removal by using GO-based metal oxide nanomaterials are also discussed.
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