Developments in the Application of Nanomaterials for Water Treatment and Their Impact on the Environment

Abstract

Nanotechnology is an uppermost priority area of research in several nations presently because of its enormous capability and financial impact. One of the most promising environmental utilizations of nanotechnology has been in water treatment and remediation where various nanomaterials can purify water by means of several mechanisms inclusive of the adsorption of dyes, heavy metals, and other pollutants, inactivation and removal of pathogens, and conversion of harmful materials into less harmful compounds. To achieve this, nanomaterials have been generated in several shapes, integrated to form different composites and functionalized with active components. Additionally, the nanomaterials have been added to membranes that can assist to improve the water treatment efficiency. In this paper, we have discussed the advantages of nanomaterials in applications such as adsorbents (removal of dyes, heavy metals, pharmaceuticals, and organic contaminants from water), membrane materials, catalytic utilization, and microbial decontamination. We discuss the different carbon-based nanomaterials (carbon nanotubes, graphene, graphene oxide, fullerenes, etc.), and metal and metal-oxide based nanomaterials (zinc-oxide, titanium dioxide, nano zerovalent iron, etc.) for the water treatment application. It can be noted that the nanomaterials have the ability for improving the environmental remediation system. The examination of different studies confirmed that out of the various nanomaterials, graphene and its derivatives (e.g., reduced graphene oxide, graphene oxide, graphene-based metals, and graphene-based metal oxides) with huge surface area and increased purity, outstanding environmental compatibility and selectivity, display high absorption capability as they trap electrons, avoiding their recombination. Additionally, we discussed the negative impacts of nanomaterials such as membrane damage and cell damage to the living beings in the aqueous environment. Acknowledgment of the possible benefits and inadvertent hazards of nanomaterials to the environment is important for pursuing their future advancement.

Reduced Graphene Oxide Membranes as Potential Self-Assembling Filter for Wastewater Treatment

“…Following the adsorption step, the filter and the ions retained therein can be disposed of or, more desirably, the filter can be recycled and the adsorbed species recovered [5,6]. A number of sorbent solids are usually employed, such as activated carbon, silica gel, pristine, and modified clay, activated silico-aluminates and polymeric materials [7,8].…”

“…Therefore, several research groups have proposed the modification and the functionalization of carbon materials to achieve a satisfactory efficiency and selectivity [7,12]. The proposed functionalization processes are targeted to improve the coordination properties of carbon species in order to capture more easily the pollutants in the aqueous solution.…”

Disinfection of Tank Water Using Biogenic Silver Nanosilica as Anti-Microbial Agents in Jeddah City

“…Incorporation of polyurethane foam coated biogenic nanoparticles (current study) enables its reactivity rather than a basic physical barrier and achieves multiple goals in one integrated system. The persistence of nanomaterials in drinking water is of concern not only because of the economic cost of water recovery but also because of the potential health consequences of removing them from drinking water [88][89][90][91][92]. The biosynthesized foam coated nano silica silver nanoparticles (NSAgNPs) developed in the current study, showed complete reduction of microorganisms in contaminated tank water samples at optimal concentration (100 mg/L) and it does not have any detrimental effect on the treated water which encourages the incorporation of these nanoparticles into drinking water purification systems.…”

Interaction of Titanium Dioxide with Formaldehyde in the Presence of Quartz Sand under Static and Dynamic Conditions

“…In addition, TiO 2 nanocomposites are widely used as adsorbents to remove metal ions from industrial waste [43]. Therefore, the use of TiO 2 nanoparticles as adsorbent could be a promising solution for environmental remediation [44].…”