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Title

MAGNETIC GRAPHENE OXIDE NANO COMPOSITE AS A SORBENT FOR REMOVAL OF HG (II) FROM AQUEOUS SOLUTIONS

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Abstract

 HG (II) IS ONE OF THE MOST TOXIC HEAVY METALS COMMONLY FOUND IN THE GLOBAL ENVIRONMENT. A WIDE RANGE OF ADSORBENTS HAS BEEN USED FOR REMOVING HG (II) FROM CONTAMINATED WATER. GRAPHENE, A NOVEL CLASS OF CARBON NANO-STRUCTURES, HAS GREAT PROMISE FOR USE AS SORBENT MATERIALS BECAUSE OF ITS ULTRAHIGH SPECIFIC SURFACE AREA.IN THIS STUDY, AN ELECTROSTATIC SELF-ASSEMBLY APPROACH WAS EMPLOYED TO PREPARE FE3O4- GRAPHENE OXIDE NANO COMPOSITE AND USED AS THE ADSORBENT FOR THE MAGNETIC SOLID-PHASE EXTRACTION (MSPE) OF HG2+ IN ENVIRONMENTAL WATER SAMPLES [1-2]. THE SYNTHESIZED NANO COMPOSITE WERE TESTED AND CHARACTERIZED BY FIELD EMISSION SCANNING ELECTRON MICROSCOPY, X-RAY DIFFRACTION POWDER, AND FOURIER TRANSFORM INFRARED SPECTROSCOPY TECHNIQUES. THE COMPOSITE ARE SUPER PARAMAGNETIC AT ROOM TEMPERATURE AND CAN BE SEPARATED BY AN EXTERNAL MAGNETIC FIELD. THE PROPOSED METHOD IS FAST, SIMPLE, CHEAP, EFFECTIVE AND SAFE FOR TREATMENT OF MERCURY POLLUTED WATERS. PREPARATION OF ADSORBENT IS EASY AND REMOVAL TIME IS SHORT. THE INFLUENCE OF VARIOUS PARAMETERS SUCH AS EFFECT OF PH, CONTACT TIME, INITIAL METAL ION CONCENTRATION AND ADSORBENT DOSE FOR THE REMOVAL OF MERCURY WAS STUDIED USING A BATCH PROCESS. OPTIMUM EXPERIMENTAL PARAMETERS WERE DETERMINED TO BE PH 5.5, CONTACT TIME 20 MIN, AND TEMPERATURE 20 OC. ADSORBENT EXHIBITS VERY HIGH ADSORPTION POTENTIAL FOR HG (II) AND MORE THAN 95.0% REMOVAL WAS ACHIEVED. LOADING CAPACITY OF ADSORBENT FOR HG IONS IS OBTAINED TO BE 890 MG G-1. IN ALL THE DETERMINATION STEPS, STRIPPING VOLTAMMETRY TECHNIQUE WAS USED FOR DETERMINATION OF HG2+ AT THE OPTIMUM ELECTROCHEMICAL CONDITIONS. ALSO THE ACCURACY OF THE METHOD WAS EVALUATED BY USING ATOMIC ABSORPTION SPECTROSCOPY AS THE STANDARD METHOD.

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