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Title

EFFECTIVE HEAVY METAL REMOVAL FROM AQUEOUS SYSTEMS BY A NOVEL NANOPOROUS ADSORBENT BASED ON GRAFTING OF DIAMSAR LIGAND ON SBA-15

Pages

 Start Page | End Page

Keywords

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Abstract

 THE INDUSTRIES SUCH AS MINE, METALLURGY, MACHINE MANUFACTURING, CHEMICAL INDUSTRY, ELECTRONICS AND INSTRUMENT, ETC., PRODUCE LARGE QUANTITIES OF HEAVY METAL WASTEWATER EVERY YEAR, PART OF WHICH IS POURED INTO WATER BODIES WITHOUT TREATMENT OR STANDARD TREATMENT, WHICH RESULTS IN THE POLLUTION OF THE AQUATIC ENVIRONMENT [1]. BECAUSE HEAVY METALS ARE DIFFICULT TO BE BIODEGRADED AND RUINED IN NATURAL CONDITIONS, THEY ARE USUALLY INGESTED BY AQUATIC ANIMALS AND PLANTS, AS WELL AS THE CROPS ON THE LAND, AND THEN ENTER INTO HUMAN BODY THROUGH FOOD CHAIN AFTER HIGH ENRICHMENT IN THE PROPAGATION’S BODIES. THEY ACCUMULATE IN SOME ORGANS OF HUMAN BODY AND CAUSE THE CHRONIC INTOXICATION, WHICH SERIOUSLY ENDANGERS THE HEALTH OF HUMAN BODY [2]. AMONG ALL WATER CONTAMINANTS, HEAVY METAL IONS, SUCH AS CR3+, CR6+, CU2+, FE3+, FE2+, NI2+, AND ZN2+, HAVE BECOME ONE OF THE MAJOR CONCERNS BECAUSE THEY ARE TOXIC TO ANIMALS AND HUMAN BEINGS, AND ARE THE MAIN CAUSE FOR FRESHWATER SYSTEMS DEGRADATION. VARIOUS TRADITIONAL TECHNOLOGIES, SUCH AS CHEMICAL PRECIPITATION, PHYSISORPTION, ELECTROCHEMISTRY, NANO-MEMBRANE TECHNOLOGY, AND BIOSORPTION, HAVE BEEN DEVELOPED TO REMOVE THE HEAVY METAL IONS FROM WASTEWATER [3]. HOWEVER, DURING THE REMOVAL PROCESS, THE POTENTIAL APPLICATION VALUE OF THE HEAVY METAL OF WASTEWATER IS IGNORED. IN THIS WORK, THE ADSORPTION OF HEAVY METALS ONTO A NOVEL NANOPOROUS ADSORBENT BASED ON GRAFTING OF DIAMSAR LIGAND ON SBA-15 WAS INVESTIGATED AT DIFFERENT INITIAL CONCENTRATIONS AND TIMES. FIG 1 SHOWS A STUDY OF THE EFFECT OF CONTACT TIME ON THE ADSORPTION OF CU (II) AT DIFFERENT INITIAL CONCENTRATIONS. IT WAS OBSERVED THAT THE ADSORPTION RATE WAS HIGH FROM T: 0 TO ABOUT 5 MIN AND BECAME SLOW DURING THE LATTER STAGES. THE ADSORPTION PROCESSES REACHED EQUILIBRIUM LESS THAN 60 MIN FOR ALL THE INITIAL CONCENTRATIONS AND TEMPERATURES STUDIED. THE VALUE OF PRESENT WORK WAS LOWER THAN THAT OF REPORTED IN THE LITERATURE WHERE THE SATURATED ADSORPTION TIME WAS FOUND TO BE NEAR 10 H FOR CU (II) ADSORPTION ON SOL–GEL PROCESSING MOLECULAR IMPRINTED POLYMER, OR 6 H FOR THE ADSORPTION ON THIOUREAMODIFIED CHITOSAN RESIN IMPRINTED POLYMER. THIS RESULT COULD BE DUE TO THE HOMOGENEOUS DISTRIBUTION OF ACTIVE SITES ON THE SURFACE OF OUR NANOPOROUS ADSORBENT.

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