Na-alginate, polyaniline and polypyrrole composites with cellulosic biomass for the adsorptive removal of herbicide: Kinetics, equilibrium and thermodynamic studies

New Hybrid Adsorbents Based on Polyaniline and Polypyrrole with Silicon Dioxide: Synthesis, Characterization, Kinetics, Equilibrium, and Thermodynamic Studies for the Removal of 2,4-Dichlorophenol

“…According to the possibilities mentioned above, these interactions were responsible and essential for the enhancement of the 2,4-DCP adsorption on the PAni and PAni:PPy surfaces. Similar results have been reported by other studies for the adsorption of 2,4-DCP by biocomposites [3] and herbicide by polyaniline/polypyrrole composites with cellulosic biomass [2]. In the case of the PAni:PPy@SiO2 adsorbent, we know that the 2,4-DCP is a positively charged molecule that can interact electrostatically with negatively charged molecules for SiO2 moieties and also with electron-rich moieties in the polymer backbone.…”

“…The was chosen for the present study. Furthermore, the pHpzc was found t of PAni and PAni:PPy [2]. The removal capacity (qeq) of 2,4-DCP by th creased with the increase in pH.…”

“…Chlorophenols are common organic pollutants used widely in the preparation of many pharmaceuticals and pesticides. Chlorinated phenol waste discharge into water exhibits toxicity to humans, aquatic organisms, and the environment [1,2]. Consequently, 2,4-dichlorophenol (2,4-DCP) is highly toxic, carcinogenic, and mutagenic and is listed as one of the environmental priority pollutants [3,4].…”

“…Among the existing treatment methods, including photocatalytic degradation [5], electrochemical oxidation [6], membrane filtration [7], flocculation coagulation [8], adsorption [9], and so on, the adsorption process is one of the more efficient and promising technologies owing to its low cost, simplicity in design and operation, and superior adsorption effectiveness even at low concentrations [9][10][11]. In addition to its toxic effect, the presence of 2,4-DCP in water in even trace amounts (5-10 µg/L) produces a specific odor and makes it undrinkable [1][2][3][4].…”

Preparation and Characterization of Extruded PLA Films Coated with Polyaniline or Polypyrrole by In Situ Chemical Polymerization

“…For each polymerization time, the main peaks of polypyrrole are displayed. The peaks at 1575 and 1432 cm –1 are attributed to the symmetric and antisymmetric vibrations of CC–N in the plane of the benzene ring, and peaks at 1210 and 1078 cm –1 correspond to the C–N in-plane deformation and the vibration of the N–H bond, respectively. , The peak observed at 959 cm –1 corresponds to the stretching vibration of CN + –C. This particular peak at 959 cm –1 confirms that PPy was effectively doped with FeCl 3 , resulting in positively charged units that act as charge carriers, i.e., polarons/bipolarons. , It is worth noting that the position of this peak shifts to higher wavenumbers as the polymerization time increases from 1 to 4 h. These findings suggest that reducing the polymerization time results in an increased electron density induced by charge transfer within the coated film .…”