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In addition, a derivative of sulfhydryl–lignocellulose has many distinctive characteristics, including water solubility, controllable biodegradation, adhesive characteristics, and heavy metal selectivity. Sulfur introduction also adds to higher acidic
solution stability owing to cross-link formation. It has become particularly appealing in latest times with regard to apps for adsorption. Significant recognition is currently being given to elastic layered silicates (e.g., montmorillonite clay). However,
due to swelling, low affinity, and dispersed water suspension properties, montmorillonite adsorbs only very small amounts of heavy metal ions to the surface of the
broken bonds on the outside. In addition, the literature showed that altered MT
exhibits a greater adsorption ability than the initial clay (Salman et al. 2015).
2.10 Polymer Nanocomposites as Adsorbent
for Heavy Metals
Although raw clay minerals also demonstrate sorption potential, it is also a wellestablished fact that unmodified natural clay particles have relatively lower adsorption capacity, so they can be altered to enhance their adsorption capacity (Ozcan
et  al. 2009). We need an alternative, cost-effective adsorbent to remediate heavy
metal in industrial wastewater that can be recovered by desorption (Li et al. 2002).
Polymer sorbents have been acknowledged in recent centuries as a protective
replacement for standard remediation methods in the form of big upper layer size,
better mechanical characteristics, changing upper layer morphology gas impermeability, and achievable desorption restoration (Pan et al. 2009). As a result, polymer
grafting on nanoclay particles dramatically enhances nanocomposite characteristics
by enhancing surface area and sites of absorption (Ray and Okamoto 2003).
2.11 Inorganic Organic Hybrid Materials as Heavy
Metal Adsorbent
Nowadays, to reduce these drawbacks, novel hybrid polymers were taken into
account to remove toxic species from wastewater. The practical variant of hydrocarbons in these compounds is united with the benefits of a thermally heat resistant and
robust inorganic substratum, which results in covalent bonding toward nominated
metal ions and comparatively high adsorption capacity of metal ions. Functionalized
polymeric hybrid materials as adsorbents are considered to be one of the most efficient methods because the organic–inorganic polymer hybrids can chemically bond
metal ions. These types of products often synergistically present the finest characteristics of each of their parts and have elevated physical, chemical, and mechanical
properties performance (Jiang et  al. 2007). Since comprehensive research on the
production of clay-based hybrid compounds by the sol–gel technique has been
2 Polymer Absorbents for Heavy Metal Removal
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