POLYACRYLATE BASED FILM MODIFIED WITH PHENYL BIGANIDE: SYNTHESIS AND APPLICATION IN WASTEWATER PURIFICATION FORM TOXIC METALS
Date
2022-05-22
Authors
Jalghoum, Reem
Journal Title
Journal ISSN
Volume Title
Publisher
جامعة النجاح الوطنية
Abstract
Background: Pollution in the water supply has become a major source of concern for society as well as an environmental issue. Contaminants enter the water in a variety of ways, including industrial, altering the water's quality and containing hazardous substances that threaten the health of humans and animals. To remove dangerous heavy metals contaminants and improve water quality, researchers used several methods. Modifying existing polymers could be the simplest and most effective way to create a low-cost adsorbent with excellent efficiency against metals and hazardous organic compounds.
Objectives: The purpose of this research was to establish a low-cost technique to make a novel adsorbent for hazardous metal ions. Surface modified polyacrylic acid with multidentate chelating functionalities was selected for this purpose. Polyacrylic acid (PAA) was covalently bonded via amide linkages to phenyl biguanide in a polymer modification process. Because of its unusual structure and the huge number of metal ion coordination sites, this adsorbent could be ideal for wastewater purification.
Methodology: Three modified polymers were prepared, in which the polyacrylic acid (PAA) was mixed with phenyl biguanide in different ratios, so that the addition of phenyl biguanide reduces the solubility of PAA and adds functionality with high affinity for metal ions. The enhanced PAA was evaluated as a Pb (II) water adsorbent. FT-IR and TGA were used to examine the polymers structures and thermal stability, respectively.
Results: The polymers were evaluated as an adsorbent for Pb (II) ions. Adsorbent dosage, metal ion concentration, temperature, pH, contact time and shaking speed were all evaluated as parameters influencing the adsorption process. The percentage removal of Pb (II) by PAA/PBG-50 was 40.36 percent rate, PAA/PBG-25 was removed at a 75.93 percent rate, and by PAA/PBG-75 reached about 93.19 percent rate. Adsorption isotherm, kinetics, and thermodynamics were also studied to acquire a better knowledge of adsorption spontaneity and mechanism. As determined by the adsorption parameters, these adsorptions were matched with the Langmuir isotherm of adsorption, and all adsorption processes follow the second order adsorption kinetics model.
Conclusion: Adsorption efficiency of the three polymers were evaluated on a real-world wastewater sample as well. The three polymers showed quantitative removal for most of the toxic metal ions present in wastewater like, lead, and mercury.
Description
Keywords
Water pollution, water treatment, polymers, heavy metal, Lead, phenyl biguanide, poly acrylic acid