Abstract
Recently, the development of a unique class of layered silicate nanomaterials has attracted considerable interest for treatment of wastewater. Clean water is an essential commodity for healthier life, agriculture and a safe environment at large. Layered double hydroxides (LDHs) and other clay hybrids are emerging as potential nanostructured adsorbents for water purification. These LDH hybrids are referred to as hydrotalcite-based materials or anionic clays and promising multifunctional two-dimensional (2D) nanomaterials. They are used in many applications including photocatalysis, energy storage, nanocomposites, adsorption, diffusion and water purification. The adsorption and diffusion capacities of various toxic contaminants heavy metal ions and dyes on different unmodified and modified LDH-samples are discussed comparatively with other types of nanoclays acting as adsorbents. This review focuses on the preparation methods, comparison of adsorption and diffusion capacities of LDH-hybrids and other nanoclay materials for the treatment of various contaminants such as heavy metal ions and dyes.
Highlights
A reliable, affordable, sustainable and accessible clean water supply chain for many societies in the entire world is an essential component for healthier life and safe environment
The maximum adsorption efficiency improved to a 99.74%, and the saturation occurred when no more metal ions could be adsorbed on the surface of Co/Mo-layered double hydroxides (LDHs)
LDHs procedures for water purification systems. Synthesis of nanomaterials such as nanoclays play a pivotal role in improving the physicochemical properties of adsorbents for pollutant removal
Summary
A reliable, affordable, sustainable and accessible clean water supply chain for many societies in the entire world is an essential component for healthier life and safe environment. Many countries and communities experienced the global challenge/phenomenon known as “Coronavirus (COVID-19) or COV2 infections”, which required a frequent washing of hands with clean water and soap or hand sanitizer to avoid or curb the spread (flatten the curve) These key risk aspects or factors adversely impact on food security, livelihood diversities and learning opportunities for poor and most susceptible households across the world. Optimization of the properties like hydrophilicity, hydrophobicity, porosity, mechanical strength and dispersibility [8,9,10] is the best option to treat wastewater Due to their high surface area, high chemical reactivity, adsorption capabilities, excellent mechanical strength and cost-effectiveness, nanomaterials have a huge potential to effectively purify water in numerous ways [8,10,11,12] by removing various contaminants. Surface modification of nanomaterials (SMNs), compared to unmodified nanomaterials, has attracted a considerable interest in science communities
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