MELANOIDIN IS A HIGH MOLECULAR WEIGHT POLYMER THAT IS CAUSED A STRONG ODOR, DARK BROWN COLOUR, WHICH AFFECT ON AQUATIC LIFE [1]. BIOLOGICAL AND PHYSICOCHEMICAL METHODS WERE USED TO REMOVAL OF MELANOIDIN THAT ADSORPTION HAS BEEN MORE EFFECTIVE [2].

MALACHITE GREEN (MG), HAS BEEN EXTREMELY USED IN AQUACULTURE AND FOOD INDUSTRIES AS ANTI-FUNGAL, ANTI-MICROBIAL AND ANTI-PARASITIC AGENT. IT CONTROLS FUNGAL ATTACKS, DUE TO ITS POTENTIAL TOXIC EFFECTS TO HUMAN CELLS AND MUTAGENIC AND CARCINOGENIC PROPERTIES AS WELL ...

SODIUM ALGINATE IS A BIOPOLYMER COMPRISING CARBOXYLATE GROUPS. THE MAGNETIC FE3O4 WERE SYNTHESIZED SEPARATELY BY PRECIPITATION OF IRON SALTS [1]. THE FE3O4 NANOPARTICLES WERE ADDED TO SODIUM ALGINATE SOLUTION AND ACRYLAMIDE WAS GRAFTED ONTO SODIUM ALGINATE IN THE PRESENCE OF MAGNETIC NANOPARTICLES. THE SEM OF THE OBTAINED MAGNETIC ADSORBENT SHOWED A RELATIVELY SMOOTH SURFACE. THE ALGINATE-BASED ADSORBENTS WERE EXAMINED TO REMOVE CATIONIC METHYLENE BLUE FROM WATER. THE EFFECT OF PH ON THE DYE ADSORPTION CAPACITY OF MAGNETIC-FREE AND MAGNETIC ADSORBENT WAS EVALUATED. THE RESULTS WERE SHOWN IN FIGURE 1. AS CAN BE SEEN FROM FIGURE, BY CHANGING THE PH OF INITIAL DYE SOLUTION, A SIGNIFICANT CHANGE IN DYE ADSORPTION CAPACITY OF ADSORBENTS WAS OBSERVED [2]. THIS BEHAVIOR CAN BE ATTRIBUTED TO THE PKA OF CARBOXYLATE GROUPS ON ALGINATE. THE PKA OF ALGINATE IS ~4.5. WHEN THE PH OF INITIAL DYE SOLUTION IS LOWER THAN 5, THE –COO- GROUPS ARE CONVERTED TO – COOH GROUPS AND SUBSEQUENTLY THE ADSORPTION CENTERS ARE DECREASED. BY INCREASING THE PH OF INITIAL DYE SOLUTION UPPER THAN 5, THE DYE ADSORPTION CAPACITY SWITCHED TO INCREASE.

WATER CONTAMINANT IS BEING RECOGNIZED AS A PRESENT AND FUTURE THREAT TO HUMAN HEALTH. A SERIES OF HEALTH SYMPTOMS, SUCH AS HEADACHE AND INSOMNIA, HAVE BEEN CAUSED BY PHENOLIC COMPOUNDS, A MAJOR CLASS OF ORGANIC POLLUTANTS IN WATER [1].DUE TO THE LARGE SURFACE AREAS, WELL-DEFINED PORE STRUCTURES, AND TUNABLE PORE SIZES, MESOPOROUS NANO PARTICLE MATERIALS HAVE BEEN WIDELY USED IN THE TECHNIQUES OF ADSORPTION AND SEPARATION. RECENTLY, FUNCTIONALIZATION OF ORDERED MESOPOROUS SILICA BY DOPING USEFUL ORGANIC MOIETIES ON OR WITHIN SILICA MATRIX HAS BEEN PROVED TO HAVE HIGH PERFORMANCE FOR THE ADSORPTION OF THE TOXIC COMPOUNDS IN WATER [2].IN THIS STUDY, MCM MESOPOROUS MAGNETIC NANOPARTICLES (FE3O4/SIO2 CORE/SHELL) WERE CHEMICALLY SYNTHESIZED AND APPLIED FOR PRECONCENTRATION OF TRACE AMOUNTS OF BISPHENOL A FROM AQUEOUS SAMPLES. BY COUPLING WITH GAS CHROMATOGRAPHY, A RELIABLE AND SENSITIVE METHOD FOR THE PRECONCENTRATION AND DETERMINATION OF BISPHENOL A WILL BE DONE.THE SYNTHESIZED NANOPARTICLES WERE CHARACTERIZED BY XRD, SEM, AND FT-IR INSTRUMENTS. THE EXPERIMENTAL PARAMETERS AFFECTING THE PRECONCENTRATION PROCESS INCLUDING SAMPLE VOLUME, SORBENT AMOUNT, CONTACT TIME AND IONIC STRENGTH WERE INVESTIGATED VIA EXPERIMENTAL DESIGN. AFTER OPTIMIZING THE EFFECTIVE PARAMETERS, THE FIGURES OF MERIT OF THE PROPOSED METHOD WERE OBTAINED AT THE OPTIMUM CONDITIONS. FINALLY, THE APPLICABILITY OF THE PROPOSED METHOD FOR THE EXTRACTION OF REAL AQUEOUS SAMPLES WAS INVESTIGATED AND SATISFACTORY RESULTS WERE OBTAINED.