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electrostatic and covalent involved in the transfer of these pollutants across the different phases of solid and liquid (Mishra et al. 2018). Recently, magnetic nanoparticles impregnated with the enzymes and metallic sites have been widely utilized for
the formation of numerous valuable products and also in the degradation of many
toxic components like phenolic substances, dyes, heavy metals, and polyhydrocarbons eliminated from harmful pesticides and insecticides (Vishnu et al. 2017). Also,
metallic sites added as the second catalytic site have widely extensively improved
their adsorption efficiency which was extensively applied in the various hazardous
dye degradations from the industrial effluents. The unique colloidal feature of
nanoparticles are extensively used as the biological probes in the synthesis of nanozymes, as device in the electronic system and sensory platforms (Sardar et al. 2007).
Due to the distinct features of simple recovery and reusability, these magnetic particles are considered as the primary support for producing the bioactively catalytic
substances. But the high cost, greater energy consumption, and chemical contamination which results in the elimination of major secondary pollutants are considered
to be the major drawbacks of following these methods (Guo et  al. 2014).
Nanoparticles modified with the addition of unique functional sites are majorly used
in the bioseparation field, owing to their special morphological and topographical
characteristics of their high specific area, porosity, structural composition, and
determined size. During enzyme immobilization, loading enzymes upon these particles exhibit the enhanced activity recovery and enzymatic activity with the greater
operational and thermal stabilities (Kumar et al. 2014). The carbon particles integrated with the magnetic particles are found to be the most compendious approach
where the above nano-aggregates have shown the enhanced adsorption capacity
with the highest purity upon the bulk production in the suitable appropriate conditions (Ji et al. 2018). The approach of integrating the plant extracts with the nanoparticle for their unique characteristics of the polyphenolic constituents, combined
with the numerous polymers and oligomers enhanced the stability of these nano
components. These multifunctional characteristics cause a great boom in the growth
of green chemistry (Arasu et al. 2019). Nanoparticles owing extensive physiochemical characteristics, which are used in many applications like drug delivery, electro
sensing process, bioremediation where they are considered as the prominent carrier
molecules in the heavy metal removal as well as in the dye degradation. The green
nanoparticles are prepared with numerous methods like enzymatic, chemical, physical, and biological process. The physical phenomena include adsorption, pyrolysis,
desorption using laser technologies, ball milling, diffusion flame synthesis, epistasis
using a molecular beam, plasma arching, and thin-film techniques (Joerger 2000).
The chemical phenomena include coprecipitation, hydrolysis, electrodeposition,
sol–gel process, Langmuir–Blodgett method, chemical vapor, catalytic routes, and
solution deposition method in the presence of high beam of radiation and enhanced
concentrated reagents (Herizchi et al. 2016; Herizchi et al. 2016). The biological
phenomenal system is considered to be the greater efficient system due to the presence of many natural constituents like saponins, tannins, alkaloids, tannins, steroids, and other primary nutrients that weed out the hazardous secondary
contaminants from the ecosystem through the bioreduction process (Kuppusamy
et al. 2016).
9 Biosorption of Metal Ions Present in Industrial Wastewater
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