Potential of polyaniline modified clay nanocomposite as a selective decontamination adsorbent for Pb(II) ions from contaminated waters; kinetics and thermodynamic study

Abstract

BackgroundNowadays significant attention is to nanocomposite compounds in water cleaning. In this article the synthesis and characterization of conductive polyaniline/clay (PANI/clay) as a hybrid nanocomposite with extended chain conformation and its application for water purification are presented.MethodsClay samples were obtained from the central plain of Abhar region, Abhar, Zanjan Province, Iran. Clay was dried and sieved before used as adsorbent. The conductive polyaniline was inflicted into the layers of clay to fabricate a hybrid material. The structural properties of the fabricated nanocomposite are studied by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM). The elimination process of Pb(II) and Cd(II) ions from synthetics aqueous phase on the surface of PANI/clay as adsorbent were evaluated in batch experiments. Flame atomic absorption instrument spectrophotometer was used for determination of the studied ions concentration. Consequence change of the pH and initial metal amount in aqueous solution, the procedure time and the used adsorbent dose as the effective parameters on the removal efficiency was investigated.ResultsSurface characterization was exhibited that the clay layers were flaked in the hybrid nanocomposite. The results show that what happen when a nanocomposite polyaniline chain is inserted between the clay layers. The adsorption of ions confirmed a pH dependency procedure and a maximum removal value was seen at pH 5.0. The adsorption isotherm and the kinetics of the adsorption processes were described by Temkin model and pseudo-second-order equation. Time of procedure, pH and initial ion amount have a severe effect on adsorption efficiency of PANI/clay.ConclusionsBy using suggested synthesise method, nano-composite as the adsorbent simply will be prepared. The prepared PANI/clay showed excellent adsorption capability for decontamination of Pb ions from contaminated water. Both of suggested synthesise and removal methods are affordable techniques.

Removal of Pb(II) from aqueous media using adsorption onto polyaniline coated sisal fibers

“…The EDX spectra of PAni/SF (Fig. b,c) further confirmed the introduction of chlorine (ClK α 2.8 keV) and nitrogen (NK α 0.53 keV) during the oxidative polymerization . It is worthy to note PAni is coated in the oxidized form and chlorine is incorporated as a dopant to keep the amine positive charge balanced.…”

Polyaniline/Nanomaterial Composites for the Removal of Heavy Metals by Adsorption: A Review

“…However, the adsorption capacity decreased when increasing the amount of MMT in the composite, which is explained by the tendency of clay particles to aggregate in the PANI matrix and, therefore, hinder the availability of active sites. In a study conducted by Piri et al [92], a polyaniline/clay nanocomposite was fabricated and tested for the removal of Pb(II) from aqueous solution. The surface characterization of the PANI/clay nanocomposite showed that the clay layers were flaked in the nanocomposite.…”

Triazine-Based Functionalized Activated Carbon Prepared from Water Hyacinth for the Removal of Hg2+, Pb2+, and Cd2+ Ions from Water

“…Among these methods, adsorption using chelating resins is considered one of the most efficient methods for water treatment owing to its low cost, flexibility in operation, and design compared to those of other methods. − Many different materials have been used as adsorbents for the uptake of toxic substances from polluted water such as metal oxides, , activated carbon (AC), covalent organic frameworks (COFs), , metal organic frameworks (MOFs), , minerals (clay), inorganic nanomaterials, agriculture wastes, , graphene oxide (GO), , and polymers. , Most of these adsorbents have low selectivity and capacity. Therefore, it is important to remove toxic metals from contaminated water using cheap and efficient adsorbents.…”