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Title

MAGHEMITE NANOPARTICLES COATED WITH A SYNTHESIZED HOMOPOLYMER AS A NEW SORBENT FOR SIMULTANEOUS REMOVAL OF PB (II), CD (II), HG (II) AND AG (I) IONS IN WASTEWATER SAMPLES

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Abstract

 RECENTLY, APPLICATION OF NANOPARTICLES FOR THE REMOVAL OF POLLUTANTS HAS COME UP AS AN INTERESTING AREA OF RESEARCH. THE UNIQUE PROPERTIES OF NANO SORBENTS ARE PROVIDING UNPRECEDENTED OPPORTUNITIES FOR THE REMOVAL OF METALS IN HIGHLY EFFICIENT AND COST EFFECTIVE APPROACHES, AND VARIOUS NANOPARTICLES AND DENDRIMERS HAVE BEEN EXPLOITED FOR THIS PURPOSE [1, 2]. NANOPARTICLES EXHIBIT GOOD ADSORPTION EFFICIENCY ESPECIALLY DUE TO HIGHER SURFACE AREA AND GREATER ACTIVE SITES FOR INTERACTION WITH METALLIC SPECIES. FURTHERMORE, ADSORBENTS WITH SPECIFIC FUNCTIONAL GROUPS HAVE BEEN DEVELOPED TO IMPROVE THE ADSORPTION CAPACITY [3].IN THIS WORK, POLYAMINOTHIOL HOMOPOLYMER COATED MAGHEMITE NANOPARTICLES (PATMNPS) WAS SYNTHESIZED AND ITS REMOVAL ABILITY FOR PB (II), CD (II), HG (II) AND AG (I) WAS INVESTIGATED. PHYSICAL CHARACTERISTICS OF PATMNPS WERE STUDIED USING TEM, FT-IR AND XRD MEASUREMENTS. THE KINETIC AND ISOTHERM OF METAL IONS ADSORPTION WERE STUDIED. THE EFFECT OF OPERATIONAL PARAMETER SUCH AS ADSORBENT DOSAGE, PH AND CONTACT TIME ON METAL IONS REMOVAL WAS EVALUATED. ADSORPTION KINETIC OF METAL IONS FOLLOWED PSEUDO-SECOND ORDER KINETICS. BATCH STUDIES WERE PERFORMED TO ADDRESS VARIOUS EXPERIMENTAL PARAMETERS FOR THE REMOVAL OF THESE IONS. HIGH METAL UPTAKE WAS FOUND PROVIDING THIS ORDER: AG (I) > HG (II) > PB (II) > CD (II) OWING TO THE STRONG CONTRIBUTION OF FUNCTIONAL GROUP OF POLYMER. IT WAS FOUND THAT ADSORPTION OF METAL IONS ONTO PATMNPS FOLLOWED WITH SIPS ISOTHERM.DESORPTION EXPERIMENTS BY ELUTION OF THE ADSORBENT WITH A MIXTURE OF NITRIC ACID AND ACETONITRILE SHOWED THAT THE MODIFIED MAGHEMITE NANOPARTICLES COULD BE REUSED WITHOUT SIGNIFICANT LOSSES OF ITS INITIAL PROPERTIES EVEN AFTER FIVE ADSORPTION–DESORPTION CYCLES. THUS, PATMNPS IS FAVORABLE AND USEFUL FOR THE REMOVAL OF THESE METAL IONS, AND THE HIGH ADSORPTION CAPACITY MAKES IT A GOOD PROMISING CANDIDATE MATERIAL FOR PB (II), CD (II), HG (II) AND AG (I) REMOVAL.

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