Nanotechnology: Emerging Opportunities and Regulatory Aspects in Water Treatment

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Advanced Functional Nanoparticles "Boon or Bane" for Environment Remediation Applications

Abstract

Nanotechnology is emerging as one of the innovative technologies, which involves the controlled synthesis of structures, materials, and devices in the nano range. Nanomaterials have shown their competence in almost all fields of science due to their entirely different functional properties than bulk counterparts. Environmental nanotechnology is a revolutionary field of science and technology that involves the use of nanomaterials for environmental applications. In this era, the most worrying issue of global concern are water scarcity, which is becoming more intense day by day due to increasing human population, civilization, environmental changes, agricultural activities, and industrialization. The conventional water treatment approaches like coagulation, flocculation, activated carbon adsorption, ozonation, and membrane processing are not competent to remove all the contaminants from wastewater, which necessitate the emergence of develo** novel water treatment technologies to overcome this social issue. In view of these, nanotechnology is one of the promising tools to solve the problems of water purification and wastewater treatment. The competency of nanomaterials is due to their high reactivity, large specific surface area, affinity for specific target contaminants, size-dependent properties, and a high degree of functionalization of engineered nanoforms. Different nanomaterials are used in the past for the detection and removal of chemical and biological contaminants. The toxic effect of nanomaterials on ecology and human health is a critical concern in their selection for commercial applications. Hence, regulatory guidelines should be adopted before the marketing of nanoengineered products. This chapter covers diverse applications of nanotechnology in different sectors, the action mechanism of nanomaterials, conventional and advanced tools for wastewater treatment, and the application of nanotechnology in water purification and wastewater treatment. Further, attention is paid to safety issues with the use of nanomaterials along with regulatory aspects. The commercial processes of nano-based materials related to water application will also be addressed.

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Questions and Answers: A Solution Manual

Questions and Answers: A Solution Manual

6.1.1 Objective Questions

  • Q1. Which technique is used for characterization of nanoparticle interaction with microbial contaminants?

    1. (a)

      Scanning Probe Microscopy (SPM)

    2. (b)

      Transmission Electron Microscopy (TEM)

    3. (c)

      Both of the above

    4. (d)

      None of the above

  • Ans. (c).

  • Q2. The sewage wastewater treatment capacity of India is

    1. (a)

      8080.8 MLD

    2. (b)

      8008.2 MLD

    3. (c)

      8642.0 MLD

    4. (d)

      9080.9 MLD

  • Ans. (a).

  • Q3. Vesicles are used for

    1. (a)

      Calcination

    2. (b)

      Encapsulation

    3. (c)

      Crystallization

    4. (d)

      All of the above

  • Ans. (b).

  • Q4. Nanoparticles of which of the following metals is used for efficient degradation of octachlorodibenzo-p-dioxin into substituent chlorinated congeners under ambient conditions

    1. (a)

      Ti

    2. (b)

      Ni

    3. (c)

      Mn

    4. (d)

      Zn

  • Ans. (d).

  • Q5. Which of the following groups of atoms, Quantum Dots are composed of?

    1. (a)

      I

    2. (b)

      II

    3. (c)

      Both of the above

    4. (d)

      None of the above

  • Ans. (b).

6.1.2 Fill in the Blanks

  1. 1.

    The process of nanotechnology was initiated by ________ in the year _______.

    • Answer: Richard Feynman, 1959

  2. 2.

    Nanotechnology is used in forensic science in DNA fingerprinting for __________ and ____________.

    • Answer: Parental testing, Solving criminal cases

  3. 3.

    The emerging pollutants in wastewater are nonbiodegradable materials due to their _______ in food web.

    • Answer: Bioaccumulation

  4. 4.

    Dendrimers are used as nano-adsorbents for removal of heavy metals by tailoring of external branches with ____ and _____ groups.

    • Answer: –NH2 and –OH

  5. 5.

    Based on layering system of nanotubes, CNTs can be _____ and ______.

    • Answer: Single-walled, multiwalled

6.1.3 Short Answer Questions

  1. 1.

    Which techniques are commonly used for the synthesis of nanoparticles?

    • Answer: Top-down approach and Bottom-up approach.

  2. 2.

    What kind of nanomaterials are used for wastewater treatment in the current scenario?

    • Answer: Metal oxides, zeolites, dendrimers, carbon nanotubes (CNTs), fullerenes, graphene-based nanomaterials, nanosorbents, nanocatalysts, biomimetic membrane, molecularly imprinted polymers (MIP), and zerovalent iron particles.

  3. 3.

    What are the applications of nanotechnology in environment sector?

    • Answer: Environmental nanotechnology is a revolutionary field of science and technology, which is gaining interest of scientific community from past few decades. Nanomaterials have been explored for generation of renewable energy in batteries, fuel cells, and supercapacitors. Nanoparticles are used for environmental remediation, water purification, and wastewater treatment.

  4. 4.

    Which techniques are currently used for wastewater treatment?

    • Answer: Activated carbon adsorption, ozonation and advanced oxidation processes, coagulation-flocculation, membrane processes, halogens (Cl, Br), sedimentation, boiling, distillation, reverse osmosis, solvent extraction, evaporation, ultraviolet light, low frequency ultrasonic radiations, ion exchange water softener, and neutralization and remineralization.

  5. 5.

    Which properties of nanoparticles make them suitable for application in wastewater purification and treatment?

    • Answer: High specific surface area, strong and wide-spectrum antimicrobial activity, high chemical stability, low cost, photocatalytic activity, ease of use, high conductivity, high mechanical strength, tunable surface chemistry, and superparamagnetism.

  6. 6.

    What are the issues for not adopting the use of CNTs at industrial level?

    • Answer: The use of CNTs is not expected at industrial scale in wastewater treatment plants due to their high production cost, coagulation phenomenon with some organic contaminants, and because of several reports of health-related concerns of NPs.

6.1.4 Long Answer Question

  1. 1.

    What are the different action mechanisms of nanomaterials used for wastewater purification and treatment?

    • Answer: Nanomaterials are used worldwide for the degradation of many pollutants like inorganic anions, phosphates, nitrates, phenols, chlorinated and halogenated organic compounds, radio elements, nitroaromatic compounds, and organic dyes by different mechanisms such as oxidation, reduction, precipitation, and adsorption. Silver nanoparticles (Ag NPs) possess good antimicrobial activity, and they have been used extensively for wastewater treatment against wide range of bacteria, viruses, and fungi. Ag NPs increase permeability of cell membrane by generation of free radicals, which finally resulting in cell apoptosis (Le et al. 2012). Some research groups have studied the action mechanism of Ag NPs and observed that these NPs can kill pathogenic bacteria by inducing physical perturbation with oxidative stress through disruption of specific microbial process by oxidation or disturbing vital cellular components or cell membrane structure. The antagonistic effect of TiO2 and ZnO NPs is linked to synthesis of reactive oxygen species, ROS (H2O2 and OH−) by ultraviolet (UV)-A irradiation through oxidative and reductive pathway. Different mechanisms associated with iron oxide (FeO) NPs under adsorption of contaminants from wastewater are magnetic selective adsorption, surface binding, electrostatic interactions, and ligand combinations. Most of the previously reported studies on wastewater treatment using Zn NPs, and Fe NPs are based on dehalogenation reaction. The oxidized CNTs possess major adsorption site for metal ions by chemical bonding and electrostatic interactions through surface functional groups like –OH and –COOH. CNTs have proved to be better adsorbents with high adsorption kinetics for heavy metals (Pb2+, Cd2+, Cu2+, and Zn2+) and short intraparticle diffusion distance, faster kinetics, and highly accessible adsorption sites. Alumina nanoadsorbents have high surface area with good thermal stability, and they can be prepared at low cost. These nanoadsorbents have been used in wastewater treatment for removal of Cd, Cr, Hg, and Pb metal ions. The graphene-based nanomaterials show their antimicrobial action by oxidative stress and microbial membrane damage. The sorption of heavy metals and organic compounds on dendrimers is achieved by hydrogen bonding, complexation, hydrophobic effect, and electrostatic interactions. The photocatalyst-based (TiO2, CeO2, and CNTs) reaction pathways (radical mediated and nonradical mediated) for degradation of organic pollutants have also been suggested in literature.

  2. 2.

    What are the available commercial systems of nanomaterials for wastewater treatment?

    • Answer: The first complete dendrimer family which was synthesized, characterized, and commercialized in 1990 was PAMAM (poly (amidoamine)) dendrimer. A team of US researchers have developed sponge that can absorb oil from water, which is made up of pure CNTs with a dash of boron. The oil can be retrieved or burned off, and sponge can be reused, and the research team is also planning to weld the sheets for oil remediation. CNT-based systems are used commercially for mitigation of different contaminants from wastewater matrices and desalination of brackish water and seawater. Two cost-competitive dendrimer-based commercial systems for drinking water treatment systems available in the market are Arsennp and ADSORBSIAâ„¢. The commercially available TFN membrane is QuantumFlux, a seawater TFN RO membrane. The commercial devices available in the market utilizing nano-Ag are MARATHON® and Aquapure® systems. In some develo** countries, nano-Ag has been incorporated into ceramic microfilters to be used as barrier for pathogens. NanoCeram (Argonide Corporation, Sanford, FL, USA) is a marketed nanofiber filter with large surface area (300–600 m2/g) and small diameter, which is used in ultrafiltration for removal of bacteria, viruses, and proteins through Columbic interactions. Purific Water (Holiday, FL, USA) has developed a filtration assembly by combining water pretreatment process with photocatalysis and ceramic filtration membrane with capacity of >4 million cubic meters/day, and this system has been successfully used for degradation of 1,4-dioxane. Dynabead® is a commercial nanocomposite available in the market for develo** pathogen detection kits. TFN membranes have been used commercially by LG NanoH2O Inc., and this technology has twice the flux of polyamide membrane with >99.7% salt rejection. The first commercial membrane with embedded aquaporins is Aquaporin Inside (Aquaporin A/S, Copenhagen, Denmark). This membrane is used in desalination applications, and it can withstand up to 10 bar and water flux rate > 100 L/(hm2).

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Lugani, Y., Vemuluri, V.R., Sooch, B.S. (2023). Nanotechnology: Emerging Opportunities and Regulatory Aspects in Water Treatment. In: Kumar, R., Kumar, R., Chaudhary, S. (eds) Advanced Functional Nanoparticles "Boon or Bane" for Environment Remediation Applications. Environmental Contamination Remediation and Management. Springer, Cham. https://doi.org/10.1007/978-3-031-24416-2_6

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